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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 734. Отображено 193.
06-05-2014 дата публикации

Maximal ratio combining of equalized symbols for MIMO systems with HARQ and/or repetition coding

Номер: US0008718166B2
Автор: Jungwon Lee, Woong Jun Jang, Hui-Ling Lou, LEE JUNGWON, JANG WOONG JUN, LOU HUI-LING
Принадлежит: Marvell World Trade Ltd., LEE JUNGWON, JANG WOONG JUN, LOU HUI-LING, MARVELL WORLD TRADE LTD, MARVELL WORLD TRADE LTD.

Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors based on the same transmitted vector. The receiver linearizes each received signal vector using one or more zero-forcing, MMSE, or other suitable linear equalizers. The components of the equalized signal vectors may be combined using maximum-ratio combining to form the components of a combined equalized signal vector. The components of the combined equalized signal vector may then be decoded individually using a linear decoder.

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Номер записи: 1
14-05-2013 дата публикации

Sub-carrier and channel matrix element ordering for receiver feedback

Номер: US0008442450B1
Автор: Rohit Nabar, Hui-Ling Lou, NABAR ROHIT, LOU HUI-LING
Принадлежит: Marvell World Trade Ltd., NABAR ROHIT, LOU HUI-LING, MARVELL WORLD TRADE LTD, MARVELL WORLD TRADE LTD.

A network device includes a first feedback module and a first calibration module. The first feedback module selectively generates a first transmission schedule that is transmitted to a link partner, wherein the first transmission schedule includes a first matrix map. The first calibration module selectively transmits a first set of training signals to the link partner, receives a first set of channel state information (CSI) for the training signals from the link partner according to the first transmission schedule, and generates a first CSI matrix based on the first set of CSI and the first matrix map.

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Номер записи: 2
16-10-2018 дата публикации

Sounding and tone block allocation for orthogonal frequency multiple access (OFDMA) in wireless local area networks

Номер: US0010103923B2
Автор: Hongyuan Zhang, Yakun Sun, Hui-Ling Lou, Liwen Chu, ZHANG HONGYUAN, SUN YAKUN, LOU HUI-LING, CHU LIWEN, Zhang, Hongyuan, Sun, Yakun, Lou, Hui-Ling, Chu, Liwen
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD

A first communication device receives sounding feedback packets from a plurality of second communication devices in a group of second communication devices for OFDMA communication. Each sounding feedback packet includes beamforming feedback information to be used by the first communication device for beamforming to the corresponding second communication device, and one or more quality indicators corresponding to one or more sub-channel blocks of an orthogonal frequency division multiplexing (OFDM) communication channel associated with the corresponding second communication device. Respective sub-channel blocks are allocated based on the quality indicators, to respective ones of the second communication devices in the group. The first communication device transmits an OFDMA data unit that includes respective OFDM data units directed to respective ones of the second communication devices in the group. The respective OFDM data units are transmitted in the respective sub-channel blocks allocated ...

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Номер записи: 3
04-05-2010 дата публикации

Data stream interleaving with non-monotonically arranged data rotations for spatially diverse transmission

Номер: US0007711060B1
Автор: Hui-Ling Lou, Bhaskar Nallapureddy, Atul Salhotra, LOU HUI-LING, NALLAPUREDDY BHASKAR, SALHOTRA ATUL
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

Systems and techniques relating to processing multiple data streams transmitted over a wireless channel. In general, according to at least one implementation, a technique includes: obtaining multiple data streams to be transmitted over a wireless channel using spatially diverse transmission; and applying data rotations to respective data streams, in connection with interleaving the multiple data streams, where the applying includes using data rotation values with respective data streams such that the data rotation values plotted against stream indices correspond to a non-monotonic function. The data rotation values can be independent of a total number of the multiple data streams to be transmitted. The data rotation values can be fixed constants. The same data rotation values can be used with respective data streams irrespective of a selected frequency band. The data rotations can include subcarrier rotations. The data rotations can include column rotations.

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Номер записи: 4
04-02-2020 дата публикации

Methods and systems for enabling communications from a station to an access point using an orthogonal frequency division multiple access (OFDMA) communication scheme

Номер: US0010554351B1
Автор: Liwen Chu, Lei Wang, Hongyuan Zhang, Jinjing Jiang, Hui-Ling Lou, CHU LIWEN, WANG LEI, ZHANG HONGYUAN, JIANG JINJING, LOU HUI-LING, Chu, Liwen, Wang, Lei, Zhang, Hongyuan, Jiang, Jinjing, Lou, Hui-Ling
Принадлежит: NXP USA, Inc., MARVELL INT LTD, NXP USA INC, Marvell International Ltd.

Methods and systems are disclosed for performing contention based uplink (UL) orthogonal frequency division multiple access (OFDMA). The method may include receiving, from an access point using a channel, a first signal including an indication of a first time and a plurality of sub-channels of the channel. The method may include modifying a counter value in response to determining that the first time has been reached. The method may include selecting a sub-channel of the plurality of sub-channels in response to determining the counter value is equal to a threshold value. The method may include transmitting a second signal to the access point using the sub-channel. The methods and systems disclosed herein may be used by stations to associate with the access point.

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Номер записи: 5
23-08-2012 дата публикации

PREAMBLE DETECTION WITH UNKNOWN CHANNEL

Номер: US20120213316A1
Автор: Jungwon Lee, Hui-Ling Lou, LEE JUNGWON, LOU HUI-LING
Принадлежит: Marvell International Ltd.

A system comprises a correlation module that correlates modulated signals with a plurality of preamble sequences and that generates correlation values. A control module selects a largest correlation value from said correlation values and detects one of said preamble sequences in said modulated signals upon determining that a magnitude of said largest correlation value is greater than or equal to a first predetermined threshold.

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Номер записи: 6
14-03-2017 дата публикации

Tone block allocation for orthogonal frequency division multiple access data unit

Номер: US0009596060B1
Автор: Yakun Sun, Mingguang Xu, Hongyuan Zhang, Liwen Chu, Lei Wang, Hui-Ling Lou, Jinjing Jiang, SUN YAKUN, XU MINGGUANG, ZHANG HONGYUAN, CHU LIWEN, WANG LEI, LOU HUI-LING, JIANG JINJING, Sun Yakun, Xu Mingguang, Zhang Hongyuan, Chu Liwen, Wang Lei, Lou Hui-Ling, Jiang Jinjing
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A method for transmitting a first field and one or more second fields is described. A number of devices in a group of multiple devices to which a first OFDMA data unit is to be transmitted is selected. A block allocation that indicates respective integer numbers of different tone blocks of a WLAN communication channel to be assigned to each device in the group of multiple devices is selected. A first field is encoded to indicate both the selected number of devices in the group and the selected block allocation. One or more second fields are encoded to indicate a respective device identifier for each device in the group of multiple devices. The first field and the one or more second fields are transmitted to each device in the group of multiple devices.

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Номер записи: 7
17-12-2019 дата публикации

Sounding and tone block allocation for orthogonal frequency division multiple access (OFDMA) in wireless local area networks

Номер: US0010511471B2
Автор: Hongyuan Zhang, Yakun Sun, Hui-Ling Lou, Liwen Chu, ZHANG HONGYUAN, SUN YAKUN, LOU HUI-LING, CHU LIWEN, Zhang, Hongyuan, Sun, Yakun, Lou, Hui-Ling, Chu, Liwen
Принадлежит: Marvell International Ltd., MARVELL WORLD TRADE LTD, MARVELL INT LTD, Marvell World Trade Ltd.

A first communication device transmits a null data packet (NDP) to multiple second communication devices. The NDP spans a channel frequency bandwidth. The first communication device receives a plurality of sounding feedback packets from the second communication devices. Each sounding feedback packet includes one or more signal-to-noise ratio (SNR) indicators corresponding to one or more respective groups of orthogonal frequency division multiplexing (OFDM) subcarriers, and the SNR indicators correspond to reception of the NDP at the plurality of second communication devices. Each sounding feedback packet in the plurality of sounding feedback packets includes a respective indication of OFDM subcarriers for which the sounding feedback packet includes SNR information, and at least one sounding feedback packet from among the plurality of sounding feedback packets does not include SNR information for all OFDM subcarriers via which the NDP was transmitted.

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Номер записи: 8
11-02-2020 дата публикации

Triggered uplink transmissions in wireless local area networks

Номер: US0010560158B2
Автор: Liwen Chu, Yakun Sun, Hongyuan Zhang, Lei Wang, Hui-Ling Lou, CHU LIWEN, SUN YAKUN, ZHANG HONGYUAN, WANG LEI, LOU HUI-LING, Chu, Liwen, Sun, Yakun, Zhang, Hongyuan, Wang, Lei, Lou, Hui-Ling
Принадлежит: NXP USA, Inc., MARVELL WORLD TRADE LTD, NXP USA INC, Marvell World Trade Ltd.

In a method for communicating in a wireless communication network a trigger frame is generated to trigger simultaneous uplink transmissions by multiple communication devices. The trigger frame includes a padding portion having a length determined based on respective time duration requirements of the multiple communication devices, the respective time duration requirements for preparing uplink transmission by the corresponding second communication devices. The trigger frame is transmitted to the multiple communication devices. The simultaneous uplink transmissions, triggered by the trigger frame, are received from the multiple communication devices.

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Номер записи: 9
05-07-2022 дата публикации

Methods and devices for communicating in a wireless network with multiple virtual access points

Номер: US0011382132B1
Автор: Liwen Chu, Lei Wang, Hongyuan Zhang, Jinjing Jiang, Hui-Ling Lou
Принадлежит: Marvell Asia Pte Ltd, Marvell Asia Pte, Ltd.

A communication device associated with a physical access point (AP) receives a physical layer (PHY) data unit having a PHY preamble. The communication device determines a value of a basic service set (BSS) color identifier in the PHY preamble, and performs a clear channel assessment (CCA) procedure to determine whether the communication device can perform a spatial reuse transmission during reception of the PHY data unit, including: determining whether the BSS color identifier is a color value corresponding to all of multiple virtual APs implemented by the physical AP, and selectively determining whether the communication device can perform the spatial reuse transmission during reception of the PHY data unit as a function of the determination of whether the BSS color identifier is the color value corresponding to all of the multiple virtual APs implemented by the physical AP.

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Номер записи: 10
12-07-2022 дата публикации

Cryptographic security in multi-access point networks

Номер: US0011388590B2
Автор: Jinjing Jiang, Manish Kumar, Hui-Ling Lou
Принадлежит: MARVELL ASIA PTE LTD, Marvell World Trade Ltd.

A method for communication in a WLAN includes onboarding, authenticating, and configuring respective BSSs of multiple access points in a multi-AP network. Respective cryptographic keys are generated for the multi-AP agents in the network by carrying out a handshaking procedure between the multi-AP controller and the multi-AP agents over the backhaul network. Upon detecting a predefined rekeying event in communications between the multi-AP controller and any given multi-AP agent, a new cryptographic key is generated for the given multi-AP agent by repeating the handshaking procedure, and applying the new cryptographic key in encrypting and authenticating messages following the rekeying event.

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Номер записи: 11
27-06-2023 дата публикации

Transmitting traffic streams via multiple WLAN communication links

Номер: US0011690011B2
Автор: Liwen Chu, Hongyuan Zhang, Hui-Ling Lou
Принадлежит: Marvell Asia Pte Ltd, Marvell Asia Pte, Ltd.

A first communication device determines whether a specific wireless local area network (WLAN) communication link, among a plurality of WLAN communication links corresponding to respective frequency segments, has been negotiated with a second communication device for a first traffic stream. In response to determining that the specific WLAN communication link has been negotiated for the first traffic stream, the first communication device transmits packets in the first traffic stream only via the specific WLAN communication link. In response to determining that no WLAN communication link has been negotiated with the second communication device for the first traffic stream, the first communication device transmits packets in the first traffic stream via multiple WLAN communication links corresponding to different frequency segments.

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Номер записи: 12
05-04-2022 дата публикации

Methods and apparatus for protecting transmissions in a wireless communication network

Номер: US0011297646B1
Автор: Liwen Chu, Lei Wang, Hongyuan Zhang, Jinjing Jiang, Yakun Sun, Hui-Ling Lou
Принадлежит: NXP USA, Inc.

In generating a physical layer (PHY) data unit is for transmission in a shared communication medium during a transmit opportunity (TXOP), a wireless communication device generates a TXOP field to indicate a length of time remaining in the TXOP. The wireless communication device generates a physical layer (PHY) preamble of the PHY data unit to include a legacy signal field in a legacy portion of the PHY preamble and a non-legacy signal field in a non-legacy portion of the PHY preamble, the non-legacy signal field generated to include the TXOP field. The wireless communication device generates the PHY data unit to include the PHY preamble and a data portion, and transmits the PHY data unit in the shared communication medium.

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Номер записи: 13
05-05-2009 дата публикации

Joint maximum likelihood estimation of integer carrier frequency offset and channel in OFDM systems

Номер: US0007529179B1
Автор: Jungwon Lee, Dimitrios-Alexandros Toumpakaris, Hui-Ling Lou, LEE JUNGWON, TOUMPAKARIS DIMITRIOS-ALEXANDROS, LOU HUI-LING
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

An Orthogonal Frequency Division Multiplexing (OFDM) receiver is provided that receives a modulated OFDM signal through a channel. The OFDM receiver includes an RF downconverter that generates a downconverted modulated OFDM signal based on the modulated OFDM signal, an analog-to-digital converter (ADC) that generates digitized OFDM symbols based on the downconverted modulated OFDM signal, a carrier-phase correction module that generates time-domain symbols based on the digitized OFDM symbols, a fast Fourier transform (FFT) module that generates frequency-domain symbols based on the time-domain symbols, and an estimator module that receives the frequency-domain symbols and determines an integer carrier frequency offset (CFO) estimate and a channel estimate and that generates respective integer CFO estimate and channel estimate signals.

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Номер записи: 14
23-07-2013 дата публикации

Tracking automatic gain control of orthogonal frequency domain multiplexing systems

Номер: US0008494097B1
Автор: Jungwon Lee, Qing Zhao, Hui-Ling Lou, LEE JUNGWON, ZHAO QING, LOU HUI-LING
Принадлежит: Marvell International Ltd., LEE JUNGWON, ZHAO QING, LOU HUI-LING, MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A system including a variable gain amplifier, an automatic gain control module, and a channel estimation module. The variable gain amplifier amplifies an input signal in accordance with a gain. The input signal includes a plurality of orthogonal frequency domain multiplexing symbols. Each of the plurality of orthogonal frequency domain multiplexing symbols is preceded by a respective cyclic prefix. The automatic gain control module adjusts, based on a signal strength of the input signal, the gain of the variable gain amplifier during the respective cyclic prefix preceding each of the plurality of orthogonal frequency domain multiplexing symbols. The automatic gain control module generates a control signal in response to the gain of the variable gain amplifier being adjusted. The channel estimation module generates a channel estimate for each of the plurality of orthogonal frequency domain multiplexing symbols and updates the channel estimate based on the control signal.

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Номер записи: 15
02-01-2018 дата публикации

Communicating broadcast signals in carrier-aggregated wireless networks

Номер: US0009860712B2
Автор: Jihwan P. Choi, Hui-Ling Lou, CHOI JIHWAN P, LOU HUI-LING, Choi Jihwan P., Lou Hui-Ling
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD, MARVELL WORLD TRADE LTD.

A method is implemented in a communication device operating in a carrier aggregation mode utilizing a plurality of component carriers, where the plurality of component carriers includes at least (i) a primary component carrier associated with a primary cell and a primary cell broadcast message channel, and (ii) a secondary component carrier associated with a secondary cell and a secondary cell broadcast message channel. The method includes receiving, at the communication device, a broadcast message associated with the primary cell via (i) the primary cell broadcast message channel or (ii) the secondary cell broadcast message channel, decoding, at the communication device, the received broadcast message associated with the primary cell, receiving, at the communication device, a broadcast message associated with the secondary cell via the secondary cell broadcast message channel, and decoding, at the communication device, the received broadcast message associated with the secondary cell.

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Номер записи: 16
08-11-2016 дата публикации

Systems and methods for performing iterative interference cancellation

Номер: US0009490938B1
Автор: Mingguang Xu, Yakun Sun, Hui-Ling Lou, XU MINGGUANG, SUN YAKUN, LOU HUI-LING, Xu Mingguang, Sun Yakun, Lou Hui-Ling
Принадлежит: Marvell International Ltd., MARVELL INT LTD

Systems and methods are provided for performing iterative interference cancellation. The systems and methods include receiving a plurality of codewords and processing the plurality of codewords using a channel decoder to obtain a decoder output. The systems and methods further include determining, based on the decoder output, whether a stopping criterion is satisfied, and cancelling interference from the plurality of codewords based on the decoder output in response to determining that the stopping criterion is not satisfied.

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Номер записи: 17
19-11-2009 дата публикации

Apparatus for Generating Spreading Sequences and Determining Correlation

Номер: US20090285339A1
Автор: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Hui-Ling Lou
Принадлежит:

An apparatus includes a signal generator to output one of a first sequence or a second sequence and to augment sequences with cover codes, such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence of is zero, a physical layer preamble controller to control the signal generator to generate a preamble of a data unit, including a short training field (STF) formatter to cause the signal generator to generate an STF for use in at least frame synchronization, and a long training field (LTF) formatter to cause the signal generator to generate an LTF for use in at least channel estimation, such that the STF formatter controls the signal generator to include the first sequence in a last portion of the STF, and the LTF formatter controls the signal generator to include the second sequence in a beginning portion of the LTF.

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Номер записи: 18
18-01-2011 дата публикации

System and method for producing weighted signals in a diversity communication system

Номер: US0007872962B1
Автор: Rohit Nabar, Kedar Shirali, Hui-Ling Lou, Jungwon Lee, NABAR ROHIT, SHIRALI KEDAR, LOU HUI-LING, LEE JUNGWON
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

The disclosed technology relates to a communication system and method in which multiple versions of a signal are processed to detect the signal. The communication system can include transmitters that communicate different versions of a signal to a receiver. The different versions are weighted versions of the signal and are communicated on different channels. The weight for a weighted signal is based on an inverse of an estimate of the phase shift of the particular channel to which the weighted signal will be communicated. The weights are also based on a unity gain such that each weighted signal has the same magnitude as the original signal. A receiver that receives the weighted signals processes the received signals to detect the original signal.

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Номер записи: 19
05-06-2018 дата публикации

Beacon frames that can be used for beamforming training

Номер: US0009992772B2
Автор: Yong Liu, Hongyuan Zhang, Raja Banerjea, Harish Ramamurthy, Hui-Ling Lou, LIU YONG, ZHANG HONGYUAN, BANERJEA RAJA, RAMAMURTHY HARISH, LOU HUI-LING, Liu, Yong, Zhang, Hongyuan, Banerjea, Raja, Ramamurthy, Harish, Lou, Hui-Ling
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD, MARVELL WORLD TRADE LTD.

A network interface device generates a packet that includes a beacon frame for transmission in a superframe. The beacon frame is used to announce the presence of a network and also is formatted as a beamforming training (BFT) frame to permit other communication devices to perform beamforming training with the packet. The beacon frame is generated to include (i) a frame control field, (ii) a duration field, (iii) a timestamp field, (iv) information indicative of a time of a subsequent association beamforming training (A-BFT) time slot, and (v) beamforming training information, which includes a countdown field. The network interface device transmits the packet during a beacon timeslot of the superframe, which is separate from an association beamforming training (A-BFT) timeslot of the superframe.

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Номер записи: 20
30-10-2012 дата публикации

Link adaptation for OFDM systems

Номер: US0008300716B1
Автор: Jungwon Lee, Jihwan P. Choi, Hui-Ling Lou, LEE JUNGWON, CHOI JIHWAN P, LOU HUI-LING, CHOI JIHWAN P.
Принадлежит: Marvell International Ltd., LEE JUNGWON, CHOI JIHWAN P, LOU HUI-LING, MARVELL INT LTD, CHOI JIHWAN P., MARVELL INTERNATIONAL LTD.

A method of adaptively selecting a modulation and coding scheme (MCS) of a communication link includes obtaining a first parameter corresponding to a Quality of Service (QoS) requirement of the communication link, obtaining a second parameter indicative of a physical condition of the communication link, selecting an MCS based on at least the first parameter and the second parameter.

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Номер записи: 21
02-08-2011 дата публикации

Preamble detection with multiple receive antennas

Номер: US0007991077B1
Автор: Jongwon Lee, Hui-Ling Lou, LEE JONGWON, LOU HUI-LING
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A system including a differential demodulation module that receives modulated signals from R antennas and that differentially demodulates the modulated signals to generate differentially demodulated signals, where R is an integer greater than or equal to 1. A summing module sums the differentially demodulated signals to generate a combined signal. A correlation module correlates the combined signal with derived preamble sequences and generates correlation values based on the correlation. The derived preamble sequences are derived from preamble sequences. Each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states. Each bit has a second state when the corresponding bit and the bit adjacent to the corresponding bit have the same state.

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Номер записи: 22
10-01-2012 дата публикации

System and method of selecting a data detection technique for a multiple-input multiple-output (MIMO) system

Номер: US0008094744B1
Автор: Leilei Song, Rohit U. Nabar, Hui-Ling Lou, Kedar Shirali, SONG LEILEI, NABAR ROHIT U, LOU HUI-LING, SHIRALI KEDAR, NABAR ROHIT U.
Принадлежит: Marvell International Ltd., SONG LEILEI, NABAR ROHIT U, LOU HUI-LING, SHIRALI KEDAR, MARVELL INT LTD, NABAR ROHIT U., MARVELL INTERNATIONAL LTD.

A system and method of selecting a data detector alternately implement different data detection techniques such as maximum likelihood, zero forcing, and minimum mean square error. Selection of a particular technique may depend upon various factors. In some implementations, a decision whether to employ a specific strategy may be based upon a modulation and coding scheme utilized by the multiple-input, multiple-output (MIMO) system.

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Номер записи: 23
05-11-2019 дата публикации

Acknowledgement for multiple user communication in a WLAN

Номер: US0010470185B2
Автор: Liwen Chu, Hongyuan Zhang, Lei Wang, Hui-Ling Lou, Jinjing Jiang, CHU LIWEN, ZHANG HONGYUAN, WANG LEI, LOU HUI-LING, JIANG JINJING, Chu, Liwen, Zhang, Hongyuan, Wang, Lei, Lou, Hui-Ling, Jiang, Jinjing
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD

A first communication device generates respective media access control (MAC) protocol data units (MPDUs) that include respective data for a respective second communication devices, and determines respective resource units (RUs) via which at least some of the second communication devices are to transmit as part of an uplink (UL) orthogonal frequency division multiple access (OFDMA) physical layer (PHY) transmission to respectively acknowledge receipt of the respective MPDUs. The first communication device generates respective control frames that are configured to prompt the at least some of the second communication devices to transmit the UL OFDMA PHY transmission, and that include indicators of the RUs via which the at least some of the second communication devices are to transmit as part of the UL OFDMA PHY transmission. The first communication device generates and transmits a single multi user (MU) PHY data unit that includes i) the MPDUs, and ii) the control frames.

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Номер записи: 24
27-11-2018 дата публикации

Multi-user ranging with unassociated stations

Номер: US0010142960B2
Автор: Liwen Chu, Sagar A. Tamhane, Christian R. Berger, Niranjan Grandhe, Hongyuan Zhang, Hui-Ling Lou, CHU LIWEN, TAMHANE SAGAR A, BERGER CHRISTIAN R, GRANDHE NIRANJAN, ZHANG HONGYUAN, LOU HUI-LING, Chu, Liwen, Tamhane, Sagar A., Berger, Christian R., Grandhe, Niranjan, Zhang, Hongyuan, Lou, Hui-Ling
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD

A first communication i) selects one or more respective preliminary identifiers (IDs) for one or more second communication devices, or ii) receives one or more respective preliminary IDs from one or more second communication devices, the one or more respective preliminary IDs having been respectively selected by the one or more second communication devices. The first communication device generates a trigger frame, the trigger frame indicating one or more first frequency resource and/or spatial stream allocations to one or more second communication devices using the one or more respective preliminary IDs. The first communication device transmits the trigger frame to initiate at least an uplink (UL) MU transmission by multiple second communication devices for a ranging procedure.

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Номер записи: 25
31-12-2019 дата публикации

Method and apparatus for uplink orthogonal frequency division multiple access communication in a WLAN

Номер: US0010524290B1
Автор: Liwen Chu, Lei Wang, Hongyuan Zhang, Jinjing Jiang, Hui-Ling Lou, CHU LIWEN, WANG LEI, ZHANG HONGYUAN, JIANG JINJING, LOU HUI-LING, Chu, Liwen, Wang, Lei, Zhang, Hongyuan, Jiang, Jinjing, Lou, Hui-Ling
Принадлежит: Marvell International Ltd., MARVELL INT LTD

A communication device performs a clear channel assessment (CCA) procedure to determine whether the communication device can transmit in a shared wireless communication medium, wherein the communication device is in a first basic service set (BSS) associated with a virtual access point (AP) implemented by a physical AP, and wherein the first BSS corresponds to a first BSS identifier. Performing the CCA procedure includes: for first signals having the first BSS identifier or having one or more second BSS identifiers corresponding to other virtual APs implemented by the physical AP, comparing energy of the signals to a first threshold; and for first signals determined by the communication device to have one or more third BSS identifiers, wherein the one or more third BSS identifiers correspond to other physical APs, comparing energy of the signals to a second threshold lower than the first threshold.

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Номер записи: 26
09-05-2013 дата публикации

Physical Layer Frame Format Design for Wideband Wireless Communications Systems

Номер: US20130114764A1
Автор: Hongyuan Zhang, Rohit U. Nabar, Arul Durai Murugan Palanivelu, Hui-Ling Lou, Songping Wu
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory. 1. (canceled)2. A processor-implemented method comprising:receiving a signal that includes a preamble and a payload portion, the preamble being a single carrier signal, and the payload portion being a single carrier signal or a multiple carrier signal; the payload portion is a single carrier signal if a first cover sequence is included in the preamble, and', 'the payload portion is a multiple carrier signal if a second cover sequence is included in the preamble;, 'determining from the preamble whether the payload portion is a single carrier signal or a multiple carrier signal, wherein'}in response to the payload portion being a single carrier signal, demodulating the payload portion in a single carrier mode;in response to the payload portion being a multiple carrier signal, demodulating the payload portion in a multiple carrier mode; andstoring data from the demodulated payload portion in a computer-readable memory.3. The processor-implemented method of claim 2 , wherein determining from ...

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Номер записи: 27
09-04-2002 дата публикации

Tuning scheme for error-corrected broadcast programs

Номер: US0006370666B1
Автор: Hui-Ling Lou, Rudiger L. Urbanke, Vijitha Weerackody, LOU HUI-LING, URBANKE RUDIGER L, WEERACKODY VIJITHA, URBANKE RUDIGER L.
Принадлежит: Agere Systems Guardian Corp., AGERE SYST GUARDIAN CORP, AGERE SYSTEMS GUARDIAN CORP.

First and second source signal streams each associated with a program source are produced. A first error correction code having a first correction delay is applied to the first source signal stream, thus producing a first error-corrected source signal stream that is transmitted for reception by a receiver. A tuning signal stream corresponding to the second source signal stream is transmitted for reception by the receiver at a determined timing relative to transmission of the first error-corrected signal stream. When first tuning to a program transmission channel, the receiver initially processes the tuning signal to obtain at least a recognizable reproduction of the program source, with little if any delay attributable to error correction coding of the first source signal stream.

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Номер записи: 28
06-03-2012 дата публикации

Method and apparatus for performing baseband equalization in symbol modulated communications

Номер: US0008130853B1
Автор: Hui-Ling Lou, Kok-Wui Cheong, LOU HUI-LING, CHEONG KOK-WUI
Принадлежит: Marvell International Ltd., LOU HUI-LING, CHEONG KOK-WUI, MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A method and apparatus for processing a frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol. The method includes generating an estimate of a channel for each sub-carrier of the frequency domain digital OFDM symbol; generating a plurality of demodulated symbols based, at least in part on, the estimate of the channel for each sub-carrier, in which each demodulated symbol corresponding to a given sub-carrier of the frequency domain digital OFDM symbol; calculating a decision metric for each sub-carrier based on (i) the channel estimate corresponding to the sub-carrier and (ii) the demodulated symbol corresponding to the sub-carrier; and estimating a most likely transmitted symbol for each sub-carrier of the frequency domain digital OFDM symbol based on the decision metric corresponding to the sub-carrier.

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Номер записи: 29
09-09-2014 дата публикации

Tracking automatic gain control of orthogonal frequency domain multiplexing systems

Номер: US0008831148B1
Автор: Jungwon Lee, Qing Zhao, Hui-Ling Lou
Принадлежит: Marvell International Ltd.

A system including a variable gain amplifier, an automatic gain control module, and a channel estimation module. The variable gain amplifier is configured to amplify an input signal in accordance with a gain. The input signal includes a plurality of orthogonal frequency domain multiplexing symbols. Each of the plurality of orthogonal frequency domain multiplexing symbols is preceded by a respective cyclic prefix. The automatic gain control module is configured to adjust, based on a signal strength of the input signal, the gain of the variable gain amplifier during the respective cyclic prefix preceding each of the plurality of orthogonal frequency domain multiplexing symbols. The channel estimation module is configured to generate a channel estimate for each of the plurality of orthogonal frequency domain multiplexing symbols, and to update the channel estimate in response to the gain of the variable gain amplifier being adjusted.

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Номер записи: 30
21-04-2020 дата публикации

Method and apparatus for ranging

Номер: US0010631187B1
Автор: Liwen Chu, Sagar A. Tamhane, Christian R. Berger, Niranjan Grandhe, Hongyuan Zhang, Hui-Ling Lou, CHU LIWEN, TAMHANE SAGAR A, BERGER CHRISTIAN R, GRANDHE NIRANJAN, ZHANG HONGYUAN, LOU HUI-LING, Chu, Liwen, Tamhane, Sagar A., Berger, Christian R., Grandhe, Niranjan, Zhang, Hongyuan, Lou, Hui-Ling
Принадлежит: Marvell International Ltd., MARVELL INT LTD

Aspects of the disclosure provide an apparatus that includes a transceiver circuit and a processing circuit. The transceiver circuit is configured to transmit and receive wireless signals. The processing circuit is configured to generate a request frame using an extended control frame format to indicate an enhanced fine timing measurement (EFTM) based range measurement to a second apparatus, cause the transceiver circuit to transmit, when a transmission opportunity (TXOP) is granted to the apparatus, wireless signals carrying the request frame to start the EFTM based range measurement that exchanges null data packets with the second apparatus, and determine a round trip time based on departure and arrival timing information of the null data packets.

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Номер записи: 31
05-06-2018 дата публикации

Beamforming scheme for phased-array antennas

Номер: US0009991941B1
Автор: Songping Wu, Manyuan Shen, Quan Zhou, Hongyuan Zhang, Hui-Ling Lou, WU SONGPING, SHEN MANYUAN, ZHOU QUAN, ZHANG HONGYUAN, LOU HUI-LING, Wu, Songping, Shen, Manyuan, Zhou, Quan, Zhang, Hongyuan, Lou, Hui-Ling
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A plurality of received signals are received at a first communication device, the plurality of received signals corresponding to at least one training signal having been transmitted by a second communication device a plurality of times via a plurality of antennas by the second communication device applying a respective antenna weight vector from a plurality of different antenna weight vectors each time the at least one training signal is transmitted. The first communication device generates a transmitter antenna weight vector based on a mathematical combination of at least i) the plurality of received signals, ii) the antenna weight vectors applied by the second communication device when transmitting the at least one training signal the plurality of times, and iii) the at least one training signal. The first communication device transmits the transmitter antenna weight vector to the second communication device.

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Номер записи: 32
24-04-2012 дата публикации

Physical layer data unit format

Номер: US0008165185B2
Автор: Hongyuan Zhang, Songping Wu, Hui-Ling Lou, Rohit U. Nabar, ZHANG HONGYUAN, WU SONGPING, LOU HUI-LING, NABAR ROHIT U, NABAR ROHIT U.
Принадлежит: Marvell World Trade Ltd., ZHANG HONGYUAN, WU SONGPING, LOU HUI-LING, NABAR ROHIT U, MARVELL WORLD TRADE LTD, NABAR ROHIT U., MARVELL WORLD TRADE LTD.

In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format, wherein the first format includes a short training field (STF) spread with a first spread code and a first cover code, a method is for generating a physical layer (PHY) data unit that conforms to a second format, wherein the PHY data unit is for transmitting PHY information. A first portion of the PHY data unit is generated to indicate the PHY data unit conforms to the second format, wherein the first portion of the PHY data unit includes an STF spread with at least one of a second spread code different than the first spread code or a second cover code different than the first cover code. A second portion of the PHY data unit is generated according to the second format, wherein the second portion of the PHY data unit includes PHY information elements not specified by the first format.

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Номер записи: 33
24-12-2015 дата публикации

METHOD AND APPARATUS FOR TRANSMITTING FIRST DATA STREAMS VIA RESPECTIVE TRANSMITTERS TO MULTIPLE CLIENT STATIONS DURING A SAME PERIOD AND SUCCESSIVELY TRANSMITTING SECOND DATA STREAMS

Номер: US20150373709A1
Автор: Rohit U. Nabar, Hongyuan Zhang, Hui-Ling Lou
Принадлежит:

An access point including a first transmitter and a second transmitter. The first transmitter is configured to (i) during a first window, transmit a first data stream to a first client station, and (ii) during a second window, transmit a second data stream to a second client station. The second transmitter is configured to: during the first window and while the first transmitter transmits the first data stream to the first client station, transmit a third data stream to a third client station; during a first portion of the second window and while the first transmitter is transmitting the second data stream to the second client station, refrain from transmitting a fourth data stream to a fourth client station; and subsequent to the first transmitter completing the transmission of the second data stream and during a second portion of the second window, transmit the fourth data stream to the fourth client station.

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Номер записи: 34
14-06-2012 дата публикации

BICM DECODING IN THE PRESENCE OF CO-CHANNEL INTERFERENCE

Номер: US20120148000A1
Автор: Jungwon Lee, Rohit U. Nabar, Hui-Ling Lou, LEE JUNGWON, NABAR ROHIT U, LOU HUI-LING, NABAR ROHIT U.
Принадлежит:

Systems and methods are provided for computing soft information for digital information based on a received signal, where the received signal suffers from noise and interference. A receiver that decodes the received signal may estimate channel information, such as the channel gain, associated with the interfering source. The receiver may also obtain modulation information through a backbone network or by decoding control information transmitted by the interfering source. Using the modulation information and the channel information, the receiver may estimate the effect that interference has on the received signal, and may compute soft information (e.g., a log-likelihood ratio) for the digital information. 1. A method of computing soft information for use in estimating digital information from an intended source , the method comprising:determining modulation information associated with at least one interfering source;receiving a signal corresponding to the digital information, wherein the signal includes an interference signal from the at least one interfering source; andcomputing soft information for the digital information from the signal based on the modulation information.2. The method of further comprising:estimating intended channel information associated with the intended source; anddetermining intended modulation information associated with the intended source,wherein computing soft information further comprises computing the soft information based on the intended channel information and the intended modulation information.3. The method of claim 2 , further comprising:receiving a pilot signal from a channel associated with the intended source,wherein estimating intended channel information comprises determining a magnitude and phase of the received pilot signal, andwherein determining intended modulation information comprises decoding the received pilot signal to identify a modulation scheme used by the intended source.4. The method of claim 1 , wherein ...

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Номер записи: 35
28-11-2023 дата публикации

WIFI backoff timer

Номер: US0011832315B1
Автор: Liwen Chu, Hongyuan Zhang, Hui-Ling Lou
Принадлежит: Marvell Asia Pte Ltd, MARVELL ASIA PTE LTD

A communication device performs a first backoff operation to determine when the communication device can begin a first simultaneous transmission via multiple channel segments. The first backoff operation includes counting down a first backoff timer in connection with a first channel segment. In response to the first backoff timer expiring, the communication device performs the first simultaneous transmission via the multiple channel segments. After performing the first simultaneous transmission via the multiple channel segments, the communication device performs a second backoff operation to determine when the communication device can begin a second simultaneous transmission via the multiple channel segments. The second backoff operation includes counting down a second backoff timer in connection with a second channel segment. In response to the second backoff timer expiring, the communication device performs the second simultaneous transmission via the multiple channel segments.

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Номер записи: 36
23-10-2018 дата публикации

Backoff operation in connection with spatial reuse

Номер: US0010111185B2
Автор: Liwen Chu, Lei Wang, Jinjing Jiang, Hongyuan Zhang, Yakun Sun, Hui-Ling Lou, CHU LIWEN, WANG LEI, JIANG JINJING, ZHANG HONGYUAN, SUN YAKUN, LOU HUI-LING, Chu, Liwen, Wang, Lei, Jiang, Jinjing, Zhang, Hongyuan, Sun, Yakun, Lou, Hui-Ling
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD

A communication device receives a signal during a backoff period of a backoff procedure, wherein the communication device is part of a first communication network. In response to determining that i) the signal is valid, ii) the signal is from another communication network, and iii) the power level of the signal does not meet a threshold that is higher than a default threshold, the communication device continues a count of a backoff timer during reception of the signal. In connection with comparing the power level of the signal to the threshold higher than the default threshold, the communication device sets a transmit power level to a reduced power level that is lower than a default power level. The communication device transmits at a transmit power level that is less than or equal to the reduced transmit power level in response to the backoff timer expiring.

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Номер записи: 37
04-06-2019 дата публикации

Acknowledgement of transmissions in a wireless local area network

Номер: US0010313923B2
Автор: Liwen Chu, Hongyuan Zhang, Hui-Ling Lou
Принадлежит: Marvell World Trade Ltd.

A first communication device receives one or more aggregate medium access control (MAC) data units from respective one or more second communication devices. Respective aggregate MAC data units include multiple MAC data units from respective ones of the one or more second communication devices. The first communication device generates one or more acknowledgement information fields, including a first acknowledgement information field corresponding to a particular second communication device includes i) a length indication that indicates a length of an acknowledgement field, and ii) the acknowledgment field of the indicated length. The acknowledgement field includes respective acknowledgement information for at least some of the multiple MAC data units received from the particular second communication device. The first communication device generates an acknowledgement data unit to include the one or more one or more acknowledgement information fields, and transmits the acknowledgment data ...

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Номер записи: 38
30-04-2019 дата публикации

Acknowledgment data unit for multiple uplink data units

Номер: US0010278224B2
Автор: Liwen Chu, Lei Wang, Jinjing Jiang, Hongyuan Zhang, Hui-Ling Lou
Принадлежит: Marvell World Trade Ltd.

A method for simultaneously communicating with multiple communication devices in a wireless local area network is described. Multiple uplink data units are received that are simultaneously transmitted by multiple second communication devices. The multiple uplink data units include a management data unit and a traffic data unit. An acknowledgment data unit is generated to acknowledge receipt of the multiple data units. The acknowledgment data unit includes (i) an indication that indicates that the acknowledgment data unit is intended for the multiple second communication devices, and (ii) respective acknowledgment information fields for the multiple second communication devices. The respective acknowledgment information fields include a first acknowledgment information field for the management data unit and a second acknowledgment information field for the traffic data unit. The acknowledgment data unit is caused to be transmitted from the first communication device to the multiple second ...

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Номер записи: 39
09-06-2015 дата публикации

Systems and methods for suppressing interference in a wireless communication system

Номер: US0009054765B2
Автор: Raphael Cendrillon, Yakun Sun, Hongyuan Zhang, Atul Salhotra, Hui-Ling Lou
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods are provided for suppressing interference from a received data signal. A characteristic of a channel is estimated, the channel being configured for transmission of data between a transmitting device and a receiving device having two or more receive antennas. A spatial correlation of interference is determined for the two or more receive antennas based on the channel characteristic. The received data signal is filtered based on the spatial correlation.

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Номер записи: 40
29-09-2020 дата публикации

Hybrid automatic repeat request for wireless local area network

Номер: US0010790937B1
Автор: Yakun Sun, Liwen Chu, Hongyuan Zhang, Sudhir Srinivasa, Hui-Ling Lou, SUN YAKUN, CHU LIWEN, ZHANG HONGYUAN, SRINIVASA SUDHIR, LOU HUI-LING, Sun, Yakun, Chu, Liwen, Zhang, Hongyuan, Srinivasa, Sudhir, Lou, Hui-Ling
Принадлежит: NXP USA, Inc., NXP USA INC

A first communication device generates and transmits a first physical layer (PHY) data unit as part of a hybrid automatic repeat request (HARQ) session, the first PHY data unit having a first plurality of media access control (MAC) protocol data units (MPDUs) including a first MPDU. The first communication device determines that a second communication device did not acknowledge successfully receiving the first MPDU. The first communication device generates and transmits a second PHY data unit as part of the HARQ session, the second PHY data unit having a second plurality of MPDUs, the second plurality of MPDUs including the first MPDU.

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Номер записи: 41
19-03-2013 дата публикации

Multi-stream soft demodulation using hard-decision schemes

Номер: US0008401127B1
Автор: Jungwon Lee, Jiwoong Choi, Hui-Ling Lou, LEE JUNGWON, CHOI JIWOONG, LOU HUI-LING
Принадлежит: Marvell International Ltd., LEE JUNGWON, CHOI JIWOONG, LOU HUI-LING, MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A method of decoding a signal transmitted via a multiple input multiple output (MIMO) communication channel includes receiving a data symbol vector including multiple data symbols that are received at substantially the same time. The received data symbol vector corresponds to a transmitted data symbol vector including multiple transmitted data symbols corresponding to the plurality of data symbols. The method further includes estimating values for transmitted data symbols in a first group of transmitted data symbols using a hard-decision technique. The method further includes calculating likelihood values for bits in a second group of transmitted data symbols using a soft-decision technique based on the estimated values of transmitted data symbols in the first group of transmitted data symbols. The first group of transmitted data symbols does not overlap with the second group of transmitted symbols.

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Номер записи: 42
20-10-2015 дата публикации

Low complexity distance metrics for maximum likelihood receivers

Номер: US0009166740B1
Автор: Adina Matache, Leilei Song, Bhaskar V. Nallapureddy, Hui-Ling Lou, MATACHE ADINA, SONG LEILEI, NALLAPUREDDY BHASKAR V, LOU HUI-LING, NALLAPUREDDY BHASKAR V.
Принадлежит: MARVELL INTERNATIONAL LTD., MARVELL INT LTD

Systems and methods are provided for determining a data value for a bit of interest in a received data signal. A closest 0-bit symbol candidate is selected from a plurality of 0-bit symbol candidates using a symbol selection distance approximation. A closest 1-bit symbol candidate is selected from a plurality of 1-bit symbol candidates using the symbol selection distance approximation. A 0-bit distance between the received data signal and the selected 0-bit symbol candidate is determined, and a 1-bit distance between the received data signal and the selected 1-bit symbol candidate is determined. A log likelihood ratio is calculated for the bit of interest using the determined 0-bit distance and the determined 1-bit distance.

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Номер записи: 43
06-05-2014 дата публикации

Multi-stream maximum-likelihood demodulation based on bitwise constellation partitioning

Номер: US0008718204B1
Автор: Jungwon Lee, Jiwoong P. Choi, Hui-Ling Lou, LEE JUNGWON, CHOI JIWOONG P, LOU HUI-LING, CHOI JIWOONG P.
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

One of a plurality of candidate data symbols is selected. All possible values of the selected one candidate data symbol are grouped into two or more bit groups. A bit group is selected from the two or more bit groups. A local optimum candidate value from values in the selected bit group is determined for the selected one candidate data symbol for a given set of values corresponding to all of the plurality of candidate data symbols but the selected one candidate data symbol, the local optimum candidate value minimizing a distance value corresponding to a distance between the received data symbol vector and a channel matrix multiplied with the candidate vector, without calculating the distance value. A likelihood value is calculated for a bit in the selected one candidate data symbol based at least in part on the determined local optimum candidate value.

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Номер записи: 44
30-09-2010 дата публикации

Sounding And Steering Protocols For Wireless Communications

Номер: US20100248635A1
Автор: Hongyuan Zhang, Hui-Ling Lou, Rohit U. Nabar, Yong Liu, ZHANG HONGYUAN, LOU HUI-LING, NABAR ROHIT U, LIU YONG, NABAR ROHIT U.
Принадлежит:

The present disclosure includes systems, apparatuses, and techniques relating to wireless local area network devices. Systems, apparatuses, and techniques include communicating with multiple wireless communication devices to determine characteristics of spatial wireless channels, determining steering matrices based on one or more outputs of the communicating, and transmitting signals that concurrently provide data to the wireless communication devices via different spatial wireless channels. The signals can be spatially steered to the wireless communication devices based on the steering matrices.

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Номер записи: 45
24-01-2023 дата публикации

Medium protection in wireless local area networks

Номер: US0011564264B2
Автор: Liwen Chu, Hongyuan Zhang, Hui-Ling Lou
Принадлежит: Marvell Asia Pte Ltd, Marvell Asia Pte, Ltd.

A communication device determines whether a PHY data unit is to be transmitted in a first frequency band from among multiple frequency bands in which a WLAN communication protocol permits operation. The multiple frequency bands also include a second frequency band. The communication device determines whether the PHY data unit is to include a PS-Poll frame, and whether a BSS color is currently disabled for the WLAN. In response to i) determining that the PHY data unit is to be transmitted in the first frequency band, ii) determining that the PHY data unit is not to include a PS-Poll frame, and iii) determining that the BSS color is not currently disabled for the WLAN: the communication device determines that a TXOP duration subfield in a PHY preamble of the PHY data unit cannot be set to a value defined by the WLAN communication protocol for indicating a TXOP duration that is unspecified.

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Номер записи: 46
11-11-2014 дата публикации

Method and apparatus for processing a preamble of a packet

Номер: US0008885669B2
Автор: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Hui-Ling Lou, ZHANG HONGYUAN, NABAR ROHIT U, WU SONGPING, LOU HUI-LING, NABAR ROHIT U.
Принадлежит: Marvell World Trade Ltd., ZHANG HONGYUAN, NABAR ROHIT U, WU SONGPING, LOU HUI-LING, MARVELL WORLD TRADE LTD, NABAR ROHIT U., MARVELL WORLD TRADE LTD.

A method for processing a preamble of a data packet, received via a communication channel, using a pair of complementary sequences, wherein a sum of out-of-phase aperiodic autocorrelation coefficients of the pair of complementary sequences is zero, and wherein the preamble includes a first field that provides synchronization information and a second field that provides channel estimation information, includes at least one of (i) correlating a received signal corresponding to the preamble with at least one sequence of the pair of complementary sequences to generate a plurality of respective correlation signals, or (ii) autocorrelating the received signal to generate an autocorrelation signal. The method also includes determining a cover code in the preamble using at least one of (i) the plurality of respective correlation signals, or (ii) the autocorrelation signal. The method also includes using the cover code to decode the preamble.

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Номер записи: 47
15-04-2014 дата публикации

Adaptive low-complexity channel estimation

Номер: US0008699644B1
Автор: Yakun Sun, Jiwoong Choi, Hui-Ling Lou, Rapheal Cendrillon, SUN YAKUN, CHOI JIWOONG, LOU HUI-LING, CENDRILLON RAPHEAL
Принадлежит: Marvell International Ltd., SUN YAKUN, CHOI JIWOONG, LOU HUI-LING, CENDRILLON RAPHEAL, MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

Systems, methods, and other embodiments associated with adaptive low-complexity channel estimation are illustrated. In one embodiment a device includes a receiver configured to receive an orthogonal frequency-division multiplexed (OFDM) signal. The device also includes a controller configured to control a switch to select between processing paths based, at least in part, on the channel conditions of the OFDM signal. The processing paths selectable by the switch include a first processing path and a second processing path.

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Номер записи: 48
25-01-2011 дата публикации

Preamble detection with multiple receive antennas

Номер: US0007876858B1
Автор: Jongwon Lee, Hui-Ling Lou, LEE JONGWON, LOU HUI-LING
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A system comprises a correlation module that receives modulated signals from R antennas, that correlates each of the modulated signals with Y preamble sequences, and that generates Y correlation values for each of the R antennas, where R and Y are integers greater than or equal to 1. A control module generates correlation sums by adding each of the Y correlation values for one of the R antennas to corresponding ones of the Y correlation values for others of the R antennas, that selects a largest correlation sum from the correlation sums, and that detects one of the preamble sequences in the modulated signals when a magnitude of the largest correlation sum is greater than or equal to a first predetermined threshold.

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Номер записи: 49
08-01-2013 дата публикации

Multi-stream demodulation scheme using multiple detectors

Номер: US0008351549B1
Автор: Jiwoong Choi, Jungwon Lee, Hui-Ling Lou, CHOI JIWOONG, LEE JUNGWON, LOU HUI-LING
Принадлежит: Marvell International Ltd., MARVELL INT LTD, CHOI JIWOONG, LEE JUNGWON, LOU HUI-LING, MARVELL INTERNATIONAL LTD.

The present disclosure provides methods and apparatus for demodulating a signal transmitted via a multiple input multiple output (MIMO) communication channel. In one embodiment, a method of demodulating a signal transmitted via a MIMO communication channel includes receiving a data symbol vector including multiple data symbols that are received at substantially the same time. The received data symbol vector corresponds to a transmitted data symbol vector. The method further includes generating multiple candidate vectors for the transmitted data symbol vector. The multiple candidate vectors are less than all possible vectors for the transmitted data symbol vector. The method further includes selecting one candidate vector from the multiple candidate vectors using a maximum-likelihood (ML) technique.

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Номер записи: 50
25-07-2017 дата публикации

Orthogonal frequency division multiple access for wireless local area network

Номер: US0009717086B2
Автор: Hongyuan Zhang, Yakun Sun, Hui-Ling Lou, Liwen Chu
Принадлежит: Marvell World Trade Ltd.

A method for generating an orthogonal frequency division multiple access (OFDMA) data unit is described. A plurality of different orthogonal frequency division multiplex (OFDM) tone blocks for a wireless local area network (WLAN) communication channel are assigned to a plurality of devices including a first device and second device. The plurality of different OFDM tone blocks includes at least a first OFDM tone block assigned to the first device and a second OFDM tone block assigned to the second device. The first OFDM tone block and the second OFDM tone block together span a bandwidth equal to a smallest channel bandwidth of a legacy WLAN communication protocol. An OFDMA data unit is generated for the WLAN communication channel. The OFDMA unit includes a preamble portion and a data portion. The preamble portion has i) at least a legacy portion that spans the entire WLAN communication channel, ii) a first non-legacy portion that spans the first OFDM tone block, and iii) a second non-legacy ...

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Номер записи: 51
19-09-2013 дата публикации

CARRIER AGGREGATION SCHEDULING BASED ON TRAFFIC CHARACTERISTICS AND CELL CHARACTERISTICS

Номер: US20130242777A1
Автор: Jihwan P. Choi, Hui-Ling Lou, Leilei Song, Ying Cai
Принадлежит: MARVELL WORLD TRADE LTD.

A method, implemented by one or more processors, for scheduling traffic streams in a communication network includes determining, via a processor, a plurality of sets of one or more cell characteristics. Each set of cell characteristics in the plurality of sets of cell characteristics corresponds to a different cell in a plurality of cells. The method also includes determining, via a processor, a first set of one or more traffic characteristics corresponding to a first traffic stream, selecting, via a processor, a first cell from the plurality of cells based on (i) the plurality of sets of cell characteristics and (ii) the first set of traffic characteristics, and assigning, via a processor, the first traffic stream to the first cell for an entire duration of the first traffic stream. 1. A method , implemented by one or more processors , for scheduling traffic streams in a communication network , the method comprising:determining, via a processor, a plurality of sets of one or more cell characteristics,wherein each set of cell characteristics in the plurality of sets of cell characteristics corresponds to a different cell in a plurality of cells;determining, via a processor, a first set of one or more traffic characteristics corresponding to a first traffic stream;selecting, via a processor, a first cell from the plurality of cells based on (i) the plurality of sets of cell characteristics and (ii) the first set of traffic characteristics; andassigning, via a processor, the first traffic stream to the first cell for an entire duration of the first traffic stream.2. A method according to claim 1 , further comprising:determining, via a processor, a second set of one or more traffic characteristics corresponding to a second traffic stream;selecting, via a processor, a second cell from the plurality of cells based on (i) the plurality of sets of cell characteristics and (ii) the second set of traffic characteristics; andassigning, via a processor, the second traffic ...

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Номер записи: 52
29-12-2009 дата публикации

Low complexity channel estimation for orthogonal frequency division modulation systems

Номер: US0007639600B1
Автор: Hui-Ling Lou, Kok-Wui Cheong, LOU HUI-LING, CHEONG KOK-WUI
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

Low complexity channel estimation techniques for orthogonal frequency division modulation (OFDM) systems. The channel estimation techniques may be applied to IEEE 802.11a/g and 802.16 systems.

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Номер записи: 53
18-09-2018 дата публикации

Physical layer data unit format for a wireless communication network

Номер: US0010079709B2
Автор: Yakun Sun, Hongyuan Zhang, Hui-Ling Lou, Kwok S. Au, SUN YAKUN, ZHANG HONGYUAN, LOU HUI-LING, AU KWOK S, Sun, Yakun, Zhang, Hongyuan, Lou, Hui-Ling, Au, Kwok S.
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD

In a method for generating a data unit, it is determined whether the data unit is to be transmitted using single carrier (SC) modulation or orthogonal frequency division (OFDM) modulation. When it is determined that the data unit is to be transmitted using SC modulation, a header field of the data unit is generated using a first technique to indicate that the data unit conforms to a first protocol and/or whether the data unit conforms to a first PHY mode or a second PHY mode of the first protocol. When it is determined that the data unit is to be transmitted using OFDM modulation, the header field is generated using a second technique to indicate that the data unit conforms to the first protocol and/or whether the data unit conforms to the first PHY mode or the second PHY mode of the first protocol.

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Номер записи: 54
29-09-2009 дата публикации

Optimum symbol timing estimation with various performance measures for OFDM systems

Номер: US0007596182B1
Автор: Jungwon Lee, Dimitrios-Alexandros Toumpakaris, Hui-Ling Lou, LEE JUNGWON, TOUMPAKARIS DIMITRIOS-ALEXANDROS, LOU HUI-LING
Принадлежит: Marvell International, Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL, LTD.

A receiver in an OFDM system may include a multi-mode estimator to estimate symbol timing offset for different performance measures. In addition to a maximum likelihood estimation mode, the estimator may have a minimum failure probability estimation mode, a minimum mean square error estimation mode, and a minimum modified mean square error estimation mode.

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Номер записи: 55
14-06-2011 дата публикации

Space-time block decoder for a wireless communications system

Номер: US0007961819B1
Автор: Hui-Ling Lou, Kok-Wui Cheong, LOU HUI-LING, CHEONG KOK-WUI
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A wireless communications system including an antenna configured to receive a sequence of symbols through a channel, in which the sequence of symbols comprise bits of user data that have been previously mapped to the sequence of symbols. The wireless communications system further includes a demodulator configured to generate a sequence of demodulated symbols by multiplying the sequence of symbols by a conjugate of a channel response of the channel; a demultiplexer configured to generate an in-phase component and a quadrature component of each demodulated symbol in the sequence of demodulated symbols; a slicer configured to, for each demodulated symbol, generate a decoded symbol by performing a hard decision based on the in-phase component and the quadrature component of the demodulated symbol; and a bit mapping module configured to determine the bits of user data associated with each decoded symbol.

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Номер записи: 56
24-05-2022 дата публикации

Hybrid ARQ MAC support in WLAN devices

Номер: US0011343026B1
Автор: Liwen Chu, Rui Cao, Hongyuan Zhang, Hui-Ling Lou, Yan Zhang
Принадлежит: NXP USA, Inc.

A method for Wireless Local-Area Network (WLAN) communication in a WLAN device includes receiving from a remote WLAN device an announcement of a maximal Hybrid Automatic Repeat Request (HARQ) buffering capability of a receiver of the remote WLAN device. A HARQ Physical-layer Protocol Data Unit (HARQ PPDU), which includes one or more HARQ coding units, is constructed in the WLAN device in response to the announcement. The HARQ PPDU is transmitted from the WLAN device to the remote WLAN device. One or more of the HARQ coding units are retransmitted in response to a request from the remote WLAN device.

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Номер записи: 57
22-01-2009 дата публикации

WIRELESS NETWORK WITH SIMULTANEOUS UPLINK TRANSMISSION OF INDEPENDENT DATA FROM MULTIPLE CLIENT STATIONS

Номер: US20090022093A1
Автор: Rohit U. Nabar, Hongyuan Zhang, Hui-Ling Lou
Принадлежит:

A wireless network comprises R client stations that respectively generate simultaneous uplink transmission (SUT) data, where R is an integer greater than one. An access point (AP) receives SUT data from each of the R client stations during an SUT period.

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Номер записи: 58
05-09-2017 дата публикации

Cell deployment with different channel bandwidth for carrier aggregation

Номер: US0009756640B2
Автор: Jihwan P. Choi, Qing Zhao, Hui-Ling Lou, CHOI JIHWAN P, ZHAO QING, LOU HUI-LING, Choi Jihwan P., Zhao Qing, Lou Hui-Ling
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD

Systems, methods, apparatus, and techniques are provided for transmitting information to user equipment (UE) in a communications network. Data is generated in (i) a first frequency range associated with a first set of carriers and (ii) a second frequency range associated with a second set of carriers, where the first frequency range specifies a first communications cell and the second frequency range specifies a second communications cell. The first cell, is assigned as a primary cell to a first set of UEs in the communications network. Control data is transmitted to both the first set of UEs and a second set of UEs using at least a portion of the first set of carriers.

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Номер записи: 59
14-04-2015 дата публикации

Cell reselection methods based on tracking area for cellular systems

Номер: US0009008659B1
Автор: Jihwan P. Choi, Jiwon S. Han, Hui-Ling Lou, CHOI JIHWAN P, HAN JIWON S, LOU HUI-LING, CHOI JIHWAN P., HAN JIWON S.
Принадлежит: Marvell International Ltd., CHOI JIHWAN P, HAN JIWON S, LOU HUI-LING, MARVELL INT LTD, CHOI JIHWAN P., HAN JIWON S., MARVELL INTERNATIONAL LTD.

In a method of assigning cell reselection parameters to be utilized by user devices served by a first cell associated with a first tracking area, that a first signal frequency is associated with a second tracking area different than the first tracking area is determined. Based on a determination that the first signal frequency is associated with the second tracking area different than the first tracking area, a first set of one or more reselection parameters is assigned to the first signal frequency.

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Номер записи: 60
08-12-2015 дата публикации

Methods, algorithms, software, circuits, receivers and systems for decoding convolutional code

Номер: US0009209837B1
Автор: Kok-Wui Cheong, Dimitrios-Alexandros Toumpakaris, Hui-Ling Lou, CHEONG KOK-WUI, TOUMPAKARIS DIMITRIOS-ALEXANDROS, LOU HUI-LING
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

Methods, software, circuits and systems involving a low complexity, tailbiting decoder. In various embodiments, the method relates to concatenating an initial and/or terminal subblock of the serial data block and outputting decoded data from an internal block of the modified data block. The circuitry generally includes a buffer, logic configured to concatenate an initial and/or terminal subblock to the serial data block, and a decoder configured to decode the data block, estimate starting and ending states for the data block, and output an internal portion of the serial data block and the one or more sequences as decoded data. The invention advantageously reduces the complexity of a suboptimal convolutional decoder, ensures smooth transitions at the beginning and end of the serial data block during decoding, and increases the reliability of the starting and ending states, without adding overhead to the transmitted data block.

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Номер записи: 61
15-12-2015 дата публикации

Medium access protection and bandwidth negotiation in a wireless local area network

Номер: US0009215055B2
Автор: Liwen Chu, Hui-Ling Lou, Hongyuan Zhang, Yakun Sun, Xiayu Zheng, Rui Cao, CHU LIWEN, LOU HUI-LING, ZHANG HONGYUAN, SUN YAKUN, ZHENG XIAYU, CAO RUI
Принадлежит: MARVELL WORLD TRADE LTD., MARVELL WORLD TRADE LTD

Respective sub-channels of an OFDM channel are allocated by a first device to second devices. A first control frame, transmitted from the first device to the second devices, indicates that the second devices are requested to transmit a second control frame to the first device. Respective second control frames are received from at the first device from least some of the second devices. A second control frame received from a particular second device indicates that at least a portion of the sub-channel allocated to the second device is available. An OFDMA data unit is transmitted by the first device. The OFDMA data unit includes respective OFDM data units transmitted to the at least some of the second devices. Each OFDM data unit is transmitted to a particular second device in the portion of the sub-channel indicated to be available by the second control frame received from the second device.

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Номер записи: 62
06-05-2014 дата публикации

Optimal linear equalizer for MIMO systems with HARQ and/or repetition coding

Номер: US0008718177B2
Автор: Jungwon Lee, Hui-Ling Lou, Woong Jun Jang, LEE JUNGWON, LOU HUI-LING, JANG WOONG JUN
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD, MARVELL WORLD TRADE LTD.

Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors based on the same transmitted vector. The symbols of the received signal vectors are combined, forming a combined received signal vector that may be treated as a single received signal vector. The combined received signal vector may be equalized by, for example, a zero-forcing or minimum-mean-squared error equalizer or another suitable linear equalizer. Following equalization, the equalized signal vector may be decoded using a simple, linear decoder.

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Номер записи: 63
14-07-2015 дата публикации

Joint estimation of channel and preamble sequence for orthogonal frequency division multiplexing systems

Номер: US0009084133B1
Автор: Jungwon Lee, Jihwan P. Choi, Hui-Ling Lou, LEE JUNGWON, CHOI JIHWAN P, LOU HUI-LING, CHOI JIHWAN P.
Принадлежит: Marvell International LTD., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A mobile station including an estimation module, a filter module, and a control module. The estimation module is configured to generate first channel estimates based on an input signal received, through a channel, from a base station. The input signal includes subcarriers used by the base station to transmit preamble sequences. The filter module is configured to generate second channel estimates by filtering the first channel estimates using a first filter or a second filter. The first filter or the second filter is selected according to a number of the subcarriers used to transmit the preamble sequences. The control module is configured to, based on the first channel estimates and the second channel estimates, estimate (i) one of the preamble sequences and (ii) the channel.

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Номер записи: 64
02-04-2013 дата публикации

Optimal linear equalizer for MIMO systems with HARQ and/or repetition coding

Номер: US0008411778B1
Автор: Jungwon Lee, Hui-Ling Lou, Woong Jun Jang, LEE JUNGWON, LOU HUI-LING, JANG WOONG JUN
Принадлежит: Marvell World Trade Ltd., LEE JUNGWON, LOU HUI-LING, JANG WOONG JUN, MARVELL WORLD TRADE LTD, MARVELL WORLD TRADE LTD.

Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors based on the same transmitted vector. The symbols of the received signal vectors are combined, forming a combined received signal vector that may be treated as a single received signal vector. The combined received signal vector may be equalized by, for example, a zero-forcing or minimum-mean-squared error equalizer or another suitable linear equalizer. Following equalization, the equalized signal vector may be decoded using a simple, linear decoder.

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Номер записи: 65
02-09-2008 дата публикации

Maximum likelihood estimation of time and frequency offset for OFDM systems

Номер: US0007421013B1
Автор: Jungwon Lee, Hui-Ling Lou, Dimitrios-Alexandros Toumpakaris, LEE JUNGWON, LOU HUI-LING, TOUMPAKARIS DIMITRIOS-ALEXANDR, TOUMPAKARIS DIMITRIOS-ALEXANDROS
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A receiver in an OFDM system may include a joint maximum likelihood (ML) estimator that estimates both time offset and frequency offset. The estimator may use samples in an observation window to estimate the time offset and frequency offset.

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Номер записи: 66
20-08-2013 дата публикации

Symbol vector-level combining receiver for incremental redundancy HARQ with MIMO

Номер: US0008516353B2
Автор: Jungwon Lee, Yakun Sun, Hui-Ling Lou, LEE JUNGWON, SUN YAKUN, LOU HUI-LING
Принадлежит: Marvell International Ltd., LEE JUNGWON, SUN YAKUN, LOU HUI-LING, MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols.

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Номер записи: 67
13-07-2010 дата публикации

Adaptive OFDM transmitter based on carrier frequency offset

Номер: US0007756003B1
Автор: Jungwon Lee, Hui-Ling Lou, Dimitrios-Alexandros Toumpakaris, LEE JUNGWON, LOU HUI-LING, TOUMPAKARIS DIMITRIOS-ALEXANDROS
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A system comprises a transmitter module that receives transmitter data, that includes at least one transmitter operating parameter and that generates an orthogonal frequency division multiplexing (OFDM) signal based on the transmitter data and the at least one transmitter operating parameter. An operating parameters generating module receives a carrier frequency offset (CFO), communicates with the transmitter module and adjusts the at least one transmitter operating parameter based on the CFO. The transmitter module adjusts a parameter of at least one of a channel coding module, a modulating module, and/or a power control module based on the CFO.

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Номер записи: 68
19-11-2013 дата публикации

Access point with simultaneous downlink transmission of independent data for multiple client stations

Номер: US0008588144B2
Автор: Rohit U. Nabar, Hongyuan Zhang, Hui-Ling Lou, NABAR ROHIT U, ZHANG HONGYUAN, LOU HUI-LING, NABAR ROHIT U.
Принадлежит: Marvell World Trade Ltd., NABAR ROHIT U, ZHANG HONGYUAN, LOU HUI-LING, MARVELL WORLD TRADE LTD, NABAR ROHIT U., MARVELL WORLD TRADE LTD.

A wireless network device includes modulation modules, each configured to receive a data stream and modulate the data stream to generate a modulated data stream. A matrix module generates a multiplexing matrix based on channel conditions between the wireless network device and each of a plurality of client stations, and applies the multiplexing matrix to each of the modulated data streams to generate multiplexed data streams. The wireless network device also includes summing modules, each configured to sum at least two of the multiplexed data streams to generate a transmit data stream. A first transmitter transmits a first one of the transmit data streams during a downlink transmission period to a first one of the client stations. A second transmitter transmits a second one of the transmit data streams to a second one of the client stations while the first transmitter transmits the first one of the transmit data streams.

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Номер записи: 69
22-12-2020 дата публикации

Frequency division multiple access (FDMA) support for wakeup radio (WUR) operation

Номер: US0010873909B1
Автор: Liwen Chu, Rui Cao, Hongyuan Zhang, Hui-Ling Lou, CHU LIWEN, CAO RUI, ZHANG HONGYUAN, LOU HUI-LING, Chu, Liwen, Cao, Rui, Zhang, Hongyuan, Lou, Hui-Ling
Принадлежит: Marvell Asia Pte, Ltd., MARVELL INT LTD, MARVELL ASIA PTE LTD, Marvell International Ltd.

A first communication device generates one or more wakeup frames for transmission to one or more second communication devices, and generates a wakeup packet to include the one or more wakeup frames for transmission in respective ones of one or more particular wakeup radio (WUR) operating channels of respective ones of the one or more second communication devices. The respective one or more WUR operating channels are determined by previous negotiation between the first communication device and respective ones of the one or more second communication devices. The first communication device transmits the wakeup packet to the one or more second communication devices, with respective ones of the one or more wakeup frames transmitted in respective ones of the one or more particular WUR operating channels to prompt the respective ones of the one or more second communication devices to transition from a low power state to an active state.

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Номер записи: 70
17-03-2009 дата публикации

Integer frequency offset estimation based on the maximum likelihood principal in OFDM systems

Номер: US0007505523B1
Автор: Jungwon Lee, Hui-Ling Lou, Dimitrios-Alexandros Toumpakaris, LEE JUNGWON, LOU HUI-LING, TOUMPAKARIS DIMITRIOS-ALEXANDROS
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A receiver in an OFDM system may include a maximum likelihood (ML) estimator that estimates the integer part of the carrier frequency offset. The estimator may operate with or without pilot subcarriers. The estimator may calculate the integer frequency offset estimate based on the cyclic shift and phase shift of subcarriers between OFDM symbols.

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Номер записи: 71
14-05-2013 дата публикации

Methods, algorithms, software, circuits, receivers and systems for decoding convolutional code

Номер: US0008443272B1
Автор: Kok-Wui Cheong, Dimitrios-Alexandros Toumpakaris, Hui-Ling Lou, CHEONG KOK-WUI, TOUMPAKARIS DIMITRIOS-ALEXANDROS, LOU HUI-LING
Принадлежит: Marvell International Ltd., CHEONG KOK-WUI, TOUMPAKARIS DIMITRIOS-ALEXANDROS, LOU HUI-LING, MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

Methods, software, circuits and systems involving a low complexity, tailbiting decoder. In various embodiments, the method relates to concatenating an initial and/or terminal subblock of the serial data block and outputting decoded data from an internal block of the modified data block. The circuitry generally includes a buffer, logic configured to concatenate an initial and/or terminal subblock to the serial data block, and a decoder configured to decode the data block, estimate starting and ending states for the data block, and output an internal portion of the serial data block and the one or more sequences as decoded data. The invention advantageously reduces the complexity of a suboptimal convolutional decoder, ensures smooth transitions at the beginning and end of the serial data block during decoding, and increases the reliability of the starting and ending states, without adding overhead to the transmitted data block.

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Номер записи: 72
24-11-2009 дата публикации

Strong short-pulse interference detection method

Номер: US0007623052B1
Автор: Songping Wu, Yui Lin, Hui-Ling Lou, WU SONGPING, LIN YUI, LOU HUI-LING
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A system for detecting interference includes an automatic gain control (AGC) module, a peak detection module, and a control module. The AGC module selectively generates a gain-locked signal when an input signal is received. The peak detector module communicates with the AGC module and selectively generates a peak-detect signal. The control module communicates with the AGC module and the peak detector module and generates a control signal when the control module does not receive the gain-locked signal within a predetermined time after receiving the peak-detect signal.

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Номер записи: 73
02-03-2021 дата публикации

Method and apparatus for uplink orthogonal frequency division multiple access

Номер: US0010938454B2
Автор: Liwen Chu, Lei Wang, Hongyuan Zhang, Hui-Ling Lou, Yakun Sun, Jinjing Jiang, CHU LIWEN, WANG LEI, ZHANG HONGYUAN, LOU HUI-LING, SUN YAKUN, JIANG JINJING, Chu, Liwen, Wang, Lei, Zhang, Hongyuan, Lou, Hui-Ling, Sun, Yakun, Jiang, Jinjing
Принадлежит: NXP USA, INC., NXP USA INC, NXP USA, Inc.

A first communication device transmits a trigger frame transmission to multiple second communication devices to prompt the multiple second communication devices to simultaneously transmit in multiple communication sub-channels. The first communication device receives one or more transmissions from one or more of the second communication devices in less than all of the communication sub-channels. The first communication device generates acknowledgment information for the one or more transmissions from the one or more of the second communication devices, and transmits the acknowledgment information via all of communication sub-channels.

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Номер записи: 74
04-03-2010 дата публикации

Physical Layer Data Unit Format

Номер: US20100054223A1
Автор: Hongyuan Zhang, Rohit U. Nabar, Manyuan Shen, Songping Wu, Hui-Ling Lou, Yong Liu, ZHANG HONGYUAN, NABAR ROHIT U, SHEN MANYUAN, WU SONGPING, LOU HUI-LING, LIU YONG, NABAR ROHIT U.
Принадлежит:

In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format, a beamforming training (BFT) data unit that conforms to a second format is transmitted, wherein a length of the BFT data unit is shorter than lengths supported by the first format, wherein the BFT data unit is for transmitting PHY beamforming training information. Information to indicate the BFT data unit conforms to the second format is transmitted to a receiving device. The BFT data unit is generated according to the second format, wherein the BFT data unit includes BFT information elements. The BFT data unit is then transmitted to the receiving device.

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Номер записи: 75
04-07-2023 дата публикации

Wireless local area network management

Номер: US0011696344B2
Автор: Liwen Chu, Hongyuan Zhang, Hui-Ling Lou
Принадлежит: Marvell Asia Pte Ltd, Marvell Asia Pte, Ltd.

An access point manages a first wireless local area network (WLAN) in a 6 GHz radio frequency (RF) band and ii) a second WLAN operating in another RF band. The access point generates a physical layer (PHY) data unit to include a management frame having i) first information indicating first network parameters of the first WLAN, and ii) second information indicating second network parameters of the second WLAN. The AP transmits the PHY data unit in the other RF band to provide, to any client stations that are operating in the other RF band and that are also capable of operating in the 6 GHz band: the first information indicating the first network parameters of the first WLAN operating in the 6 GHz RF band to assist the any client stations that are operating in the other RF band with joining the first WLAN operating in the 6 GHz RF band.

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Номер записи: 76
20-11-2018 дата публикации

Systems and methods for introducing time diversity in WiFi transmissions

Номер: US0010135582B1
Автор: Yakun Sun, Hongyuan Zhang, Liwen Chu, Hui-Ling Lou, SUN YAKUN, ZHANG HONGYUAN, CHU LIWEN, LOU HUI-LING, Sun, Yakun, Zhang, Hongyuan, Chu, Liwen, Lou, Hui-Ling
Принадлежит: Marvell International Ltd., MARVELL INT LTD

Systems and methods are provided for introducing time diversity in a transmitter. The systems and methods may include receiving, at the transmitter, a request from a receiver to retransmit data. The systems and methods may further include receiving an input of data corresponding to the data requested for retransmission at a first transmitter block. The systems and methods may further include operating on the signals using the first transmitter block in at least one of a first mode and a second mode, such that an output of signals from the first transmitter block is dependent on a time-varying function and corresponds to the data requested by the receiver for retransmission.

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Номер записи: 77
25-06-2013 дата публикации

Methods and apparatus for antenna spoofing

Номер: US0008472381B1
Автор: Jungwon Lee, Jihwan P. Choi, Hui-Ling Lou, Yakun Sun, LEE JUNGWON, CHOI JIHWAN P, LOU HUI-LING, SUN YAKUN, CHOI JIHWAN P.
Принадлежит: Marvell International Ltd., LEE JUNGWON, CHOI JIHWAN P, LOU HUI-LING, SUN YAKUN, MARVELL INT LTD, CHOI JIHWAN P., MARVELL INTERNATIONAL LTD.

In a method for utilizing beamforming in a wireless communication system, reference signals corresponding to a first communication channel from a first communication device to a second communication device are received, and an estimate of the first communication channel is generated using the received reference signals. One or more transmit beamforming vectors are calculated using the estimate of the first communication channel, and the one or more transmit beamforming vectors are utilized to transmit signals via a second communication channel from the second communication device to the first communication device while the first communication device assumes that the first second communication device is not utilizing beamforming.

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Номер записи: 78
28-05-2019 дата публикации

Uplink multi-user transmission

Номер: US0010305659B2
Автор: Liwen Chu, Lei Wang, Jinjing Jiang, Hongyuan Zhang, Yakun Sun, Hui-Ling Lou, CHU LIWEN, WANG LEI, JIANG JINJING, ZHANG HONGYUAN, SUN YAKUN, LOU HUI-LING, Chu, Liwen, Wang, Lei, Jiang, Jinjing, Zhang, Hongyuan, Sun, Yakun, Lou, Hui-Ling
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD

A method for transmitting a subchannel availability for an uplink (UL) multi-user (MU) transmission is described. An availability of one or more subchannels of an orthogonal frequency division multiplex (OFDM) channel are determined by a first communication device for the UL MU transmission. A High Throughput (HT) Control field of a media access control (MAC) header that includes an indication of the determined availability of the one or more subchannels is generated by the first communication device. A MAC protocol data unit (MPDU) that includes the HT Control field is generated by the first communication device. The MPDU is transmitted by the first communication device to a second communication device via the OFDM channel for a subsequent allocation of radio resources for the UL MU transmission by the second communication device.

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Номер записи: 79
02-10-2012 дата публикации

Data symbol mapping for multiple-input multiple-output hybrid automatic repeat request

Номер: US0008279963B2
Автор: Jungwon Lee, Bhaskar V. Nallapureddy, Hui-Ling Lou, LEE JUNGWON, NALLAPUREDDY BHASKAR V, LOU HUI-LING, NALLAPUREDDY BHASKAR V.
Принадлежит: Marvell World Trade Ltd., LEE JUNGWON, NALLAPUREDDY BHASKAR V, LOU HUI-LING, MARVELL WORLD TRADE LTD, NALLAPUREDDY BHASKAR V., MARVELL WORLD TRADE LTD.

A system includes an encoding module, a symbol selection module, a subcarrier selection module, and a mapping module. The encoding module receives symbols for transmission over K subcarriers and T antennas, encodes the symbols using a space time code, and generates space time coded (STC) versions of the symbols, where K and T are integers greater than 1. The symbol selection module selects T adjacent ones of the symbols and selects STC versions of the T adjacent ones of the symbols. The subcarrier selection module selects one of the K subcarriers for transmitting the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols. The mapping module maps the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers, respectively, and maps the STC versions of the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers.

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Номер записи: 80
26-06-2018 дата публикации

Channel frame structures for high efficiency wireless LAN (HEW)

Номер: US0010009922B2
Автор: Lei Wang, Liwen Chu, Yakun Sun, Hongyuan Zhang, Jinjing Jiang, Mingguang Xu, Hui-Ling Lou, WANG LEI, CHU LIWEN, SUN YAKUN, ZHANG HONGYUAN, JIANG JINJING, XU MINGGUANG, LOU HUI-LING, Wang, Lei, Chu, Liwen, Sun, Yakun, Zhang, Hongyuan, Jiang, Jinjing, Xu, Mingguang, Lou, Hui-Ling
Принадлежит: MARVELL WORLD TRADE LTD., MARVELL WORLD TRADE LTD, Marvell World Trade LTD.

An high efficiency wireless local area network access point including a channel access module and a scheduling module. The channel access module accesses a channel of an unlicensed frequency band, which includes a plurality of subchannels. The scheduling module generates a schedule for a plurality of high efficiency wireless local area network client stations to transmit data to the access point via the channel of the unlicensed frequency band. The schedule includes information for the plurality of client stations regarding (i) a time slot in which to access the channel without contention to transmit data to the access point via the channel, (ii) a subchannel of the plurality of subchannels to use during the time slot to transmit data to the access point, and (iii) one or more spatial streams to use on the subchannel and during the time slot to transmit data to the access point.

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Номер записи: 81
02-03-2017 дата публикации

TONE BLOCK ALLOCATION FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS DATA UNIT

Номер: US20170063588A1
Автор: Yakun SUN, Mingguang Xu, Hongyuan Zhang, Liwen Chu, Lei Wang, Hui-Ling Lou, Jinjing Jiang, SUN YAKUN, XU MINGGUANG, ZHANG HONGYUAN, CHU LIWEN, WANG LEI, LOU HUI-LING, JIANG JINJING, SUN Yakun, Xu Mingguang, Zhang Hongyuan, Chu Liwen, Wang Lei, Lou Hui-Ling, Jiang Jinjing
Принадлежит:

For a first group of devices having a first group size, a set of block allocations is selected from a codebook. A block allocation for the first group of devices is selected from the selected set of block allocations. A corresponding integer number of different orthogonal frequency division multiplexing (OFDM) tone blocks is assigned to each device of the first group of devices according to the allocation. An orthogonal frequency division multiple access (OFDMA) data unit to be transmitted to the first group of devices via the WLAN communication channel is generated using the assigned set of OFDM tone blocks. The OFDMA data unit includes a preamble portion and a data portion, the preamble portion having an index to the codebook that indicates i) the first group size, and ii) the selected block allocation. 1. A method , comprising:selecting, for a first group of devices having a first group size of a plurality of potential group sizes, a set of block allocations from a codebook, the codebook having respective sets of block allocations corresponding to each of the plurality of potential group sizes, wherein the selected set of block allocations is selected to correspond to the first group size;selecting a block allocation for the first group of devices from the selected set of block allocations, the selected block allocation indicating a respective set of orthogonal frequency division multiplexing (OFDM) tone blocks to be assigned to each device of the first group of devices, each set of OFDM tone blocks indicating a respective integer number of different OFDM tone blocks of a wireless local area network (WLAN) communication channel;assigning, to each device of the first group of devices, the corresponding integer number of different OFDM tone blocks of the selected block allocation, wherein the selected block allocation includes at least i) a first set of OFDM tone blocks assigned to a first device of the first group of devices and ii) a second set of OFDM tone ...

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Номер записи: 82
19-11-2009 дата публикации

Efficient Physical Layer Preamble Format

Номер: US20090285241A1
Автор: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Hui-Ling Lou
Принадлежит:

A method for generating a preamble of a data unit includes generating a short training field (STF) of the preamble to include one of a repeating series of a sequences or a repeating series of b sequences, such that a and b are complementary sequences, a sum of out-of-phase aperiodic autocorrelation coefficients of a and b is zero, and where the STF is associated with at least synchronization information, and generating a long training field (LTF) of the preamble after the STF to include a′ sequences and b′ sequences, such that a′ is the sequence a cyclically shifted by zero or more positions, b′ is the sequence b cyclically shifted by zero or more positions, and where the LTF is associated with channel estimation information.

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Номер записи: 83
05-01-2010 дата публикации

Divisionless baseband equalization in symbol modulated communications

Номер: US0007643586B1
Автор: Hui-Ling Lou, Kok-Wui Cheong, LOU HUI-LING, CHEONG KOK-WUI
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A receiver baseband processor comprises a channel estimator that generates a channel estimate from a received symbol. A phase demodulator receives the channel estimate from the channel estimator and selectively rotates the phase of the received symbol. A decoder comprises a branch metric calculator that computes a plurality of branch metrics based on the channel estimate and selectively phase rotated received symbol. A most-likely symbol estimator estimates a clean symbol based on the plurality of branch metrics.

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Номер записи: 84
28-05-2013 дата публикации

Method and apparatus for implementing transmit diversity in OFDM systems

Номер: US0008451931B1
Автор: Jungwon Lee, Jihwan P. Choi, Hui-Ling Lou, Rohit Nabar, Yakun Sun, LEE JUNGWON, CHOI JIHWAN P, LOU HUI-LING, NABAR ROHIT, SUN YAKUN, CHOI JIHWAN P.
Принадлежит: Marvell International Ltd., LEE JUNGWON, CHOI JIHWAN P, LOU HUI-LING, NABAR ROHIT, SUN YAKUN, MARVELL INT LTD, CHOI JIHWAN P., MARVELL INTERNATIONAL LTD.

A plurality of diagonal matrices Ci is determined, where the plurality of diagonal matrices Ci is for modifying a plurality of transmit signals to be transmitted via a plurality of transmit antennas, each diagonal matrix Ci for modifying an i-th block of sub-carriers, adjacent in frequency, in the plurality of transmit signals. The plurality of diagonal matrices Ci is used to modify the plurality of transmit signals to implement transmit diversity.

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Номер записи: 85
05-06-2014 дата публикации

PILOT DESIGN FOR UNIVERSAL FREQUENCY REUSE IN CELLULAR ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING SYSTEMS

Номер: US20140153659A1
Автор: Jungwon Lee, Hui-Ling Lou, LEE JUNGWON, LOU HUI-LING
Принадлежит: Marvell World Trade Ltd.

Systems and methods are provided for transmitting information between an intended source and a receiver to minimize co-channel interference from at least one interfering source. Pilot subcarriers and data subcarriers may be broadcast from an intended source and at least one interfering source. The pilot subcarriers may be shared across base stations or distributed among base stations in frequency, in time, or both. In addition, the frequency reuse factor of the pilot subcarriers may be different than the frequency reuse factor of the data subcarriers A receiver receives a composite signal that corresponds with an intended signal from an intended source and an interfering signal from at least one interfering source. The portion of the received signal that corresponds to the intended signal may be recovered by the receiver based on the broadcast of the pilot subcarriers.

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Номер записи: 86
17-01-2023 дата публикации

Methods and apparatus for generation of physical layer protocol data units for vehicular environments

Номер: US0011558226B2
Автор: Rui Cao, Hongyuan Zhang, Hui-Ling Lou, Xiayu Zheng
Принадлежит: Marvell Asia Pte Ltd, Marvell Asia Pte, Ltd.

A communication device selects a frequency bandwidth via which a physical layer (PHY) protocol data unit (PPDU) will be transmitted in a vehicular communication network, and generates, the PPDU i) according to a downclocking ratio of 1/2, and ii) based on an orthogonal frequency division multiplexing (OFDM) numerology defined by an IEEE 802.11ac Standard. In response to the selected frequency bandwidth being 10 MHz, the PPDU is generated according to the downclocking ratio of 1/2 and based on the OFDM numerology defined by the IEEE 802.11ac Standard for 20 MHz PPDUs. In response to the selected frequency bandwidth being 20 MHz, the PPDU is generated according to the downclocking ratio of 1/2 and based on the OFDM numerology defined by the IEEE 802.11ac Standard for 40 MHz PPDUs.

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Номер записи: 87
24-10-2023 дата публикации

Group acknowledgement for multiple user communication in a wireless local area network

Номер: US0011799523B2
Автор: Liwen Chu, Lei Wang, Jinjing Jiang, Hongyuan Zhang, Hui-Ling Lou
Принадлежит: NXP USA, INC.

In a method for simultaneously communicating with multiple communication devices in a wireless local area network a first communication device receives a plurality of uplink data units simultaneously transmitted by multiple second communication devices. The first communication device generates an acknowledgement data unit to acknowledge receipt of the multiple data units simultaneously transmitted by multiple second communication devices. The acknowledgement data unit includes (i) an indication that indicates that the acknowledgement data unit is intended for multiple second communication devices and (ii) respective acknowledgement information for the multiple second communication devices. The acknowledgement data unit is transmitted from the first communication device to the multiple second communication devices.

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Номер записи: 88
08-05-2012 дата публикации

Preamble detection with unknown channel

Номер: US0008175197B2
Автор: Jungwon Lee, Hui-Ling Lou, LEE JUNGWON, LOU HUI-LING
Принадлежит: Marvell World Trade Ltd., LEE JUNGWON, LOU HUI-LING, MARVELL WORLD TRADE LTD, MARVELL WORLD TRADE LTD.

A system includes a correlation module and a control module. The correlation module is configured to generate correlation values based on a correlation of modulated signals with a plurality of preamble sequences and generate correlation values. The modulated signals include sub-carriers modulated using orthogonal frequency domain multiplexing (OFDM). The control module is configured to select a largest correlation value from the correlation values and detect one of the preamble sequences in the modulated signals upon determining that a magnitude of the largest correlation value is greater than or equal to a first predetermined threshold. The control module divides N of the sub-carriers into L bands in response to a channel gain of the sub-carriers not being substantially the same for all of the sub-carriers, where N and L are integers greater than 1, and where each of the L bands includes N/L of the sub-carriers.

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Номер записи: 89
24-03-2015 дата публикации

Data stream interleaving with non-monotonically arranged data rotations for spatially diverse transmission

Номер: US0008989297B1
Автор: Hui-Ling Lou, Bhaskar Nallapureddy, Atul Salhotra, LOU HUI-LING, NALLAPUREDDY BHASKAR, SALHOTRA ATUL
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

Systems and techniques relating to processing multiple data streams include, according to an aspect, a method including interleaving data streams to be transmitted over a wireless channel, wherein the interleaving comprises performing a first permutation and a second permutation, and applying data rotations to the data streams in connection with the interleaving, wherein each of the data rotations has a constant rotation value for its corresponding stream index regardless of how many data streams are currently being transmitted, a second rotation value used for a second stream is larger than a first rotation value used for a first stream, a third rotation value used for a third stream is greater than the first rotation value but less than the second rotation value, and a fourth rotation value used for a fourth stream is greater than the second rotation value, and wherein the data rotations are applied after the second permutation.

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Номер записи: 90
19-09-2013 дата публикации

SUB-CARRIER AND CHANNEL MATRIX ELEMENT ORDER FOR RECEIVER FEEDBACK

Номер: US20130244586A1
Автор: Rohit Nabar, Hui-Ling Lou
Принадлежит: Marvell World Trade Ltd.

A first network device including a first calibration module to generate training signals for each of a plurality of subcarriers. The training signals are transmitted from the first network device to a second network device via antennas of the first network device using the subcarriers. A first steering module receives a first matrix for each subcarrier, which includes channel state information for each of the training signals received by the second network device, from the second network device according to a transmission schedule and generates a steering matrix based on the first matrix. The transmission schedule is predetermined or is transmitted to the second network device prior to transmitting the training signals. A first control module adjusts, based on the steering matrix, first beamforming weights associated with the antennas to direct first radio frequency signals to be transmitted toward the second network device. 1. A first network device comprising: generate a first set of training signals for each subcarrier of a plurality of subcarriers,', 'wherein the first set of training signals is transmitted from the first network device to a second network device via a first set of antennas of the first network device using the plurality of subcarriers;, 'a first calibration module configured to'} (i) receive a first channel state information matrix for each subcarrier from the second network device according to a transmission schedule, wherein the first channel state information matrix for each subcarrier includes channel state information for each of the first set of training signals received by the second network device from the first network device, and (ii) generate a first steering matrix based on the first channel state information matrix,', 'wherein (i) the transmission schedule is predetermined, or (ii) in response to the transmission schedule not being predetermined, the transmission schedule is transmitted to the second network device prior to the ...

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Номер записи: 91
07-03-2017 дата публикации

Sub-carrier adaptation in multi-carrier communication systems

Номер: US0009590832B1
Автор: Hongyuan Zhang, Hui-Ling Lou, Songping Wu, ZHANG HONGYUAN, LOU HUI-LING, WU SONGPING, Zhang Hongyuan, Lou Hui-Ling, Wu Songping
Принадлежит: Marvell International Ltd., ZHANG HONGYUAN, LOU HUI-LING, WU SONGPING, MARVELL INT LTD, Zhang Hongyuan, Lou Hui-Ling, Wu Songping

Methods an apparatus for performing sub-carrier adaptation in multi-carrier communication systems. In one embodiment, a method includes receiving, via a reverse communication channel, a first data unit via multiple subcarriers. The method further includes determining an estimate of a forward communication channel based on the received first data unit. The method further includes determining different bit rates for the multiple subcarriers based on the estimate of the forward channel. The method further includes transmitting a second data unit via the multiple subcarriers, where bits in the second data unit are allocated across the multiple subcarriers based on the determined bit rates for the multiple subcarriers.

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Номер записи: 92
14-07-2020 дата публикации

Error recovery in null data packet (NDP) ranging

Номер: US0010712422B2
Автор: Liwen Chu, Hongyuan Zhang, Hui-Ling Lou, CHU LIWEN, ZHANG HONGYUAN, LOU HUI-LING, Chu, Liwen, Zhang, Hongyuan, Lou, Hui-Ling
Принадлежит: NXP USA, INC., NXP USA INC, NXP USA, Inc.

A first communication device transmits a first physical layer protocol data units (PPDU) that includes a first null data packet announcement (NDPA) frame as part of a first ranging measurement exchange. The first communication device transmits a first null data packet (NDP) as part of the first ranging measurement exchange, and records a transmit time of the first NDP. The first communication device determines whether a second NDP was received correctly from a second communication device as part of the first ranging measurement exchange. In response to determining that the second NDP was not received correctly, the first communication device commences a second ranging measurement exchange, including transmitting a second PPDU that includes a second NDPA frame as part of the second ranging measurement exchange.

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Номер записи: 93
28-05-2015 дата публикации

UPLINK MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT BEAMFORMING

Номер: US20150146812A1
Автор: Liwen CHU, Hongyuan Zhang, Hui-Ling Lou, CHU LIWEN, ZHANG HONGYUAN, LOU HUI-LING
Принадлежит:

As part of a beamforming training procedure, a first communication device transmits a beamforming training packet. The first device then receives a plurality of respective beamforming feedback packets from a plurality of second communication devices. The first device then uses the plurality of beamforming feedback packets to select a group of multiple communication devices from among the plurality of second communication devices, wherein the group is selected for simultaneous transmissions to the first communication device. The first device then transmits a synchronization signal to the group to prompt second communication devices in the group to simultaneously transmit to the first communication device at a particular time. The first device then receives simultaneous transmissions from the group responsive to the synchronization signal.

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Номер записи: 94
05-07-2022 дата публикации

Bandwidth indication, negotiation and TXOP protection with multiple channel segments

Номер: US0011382101B1
Автор: Liwen Chu, Hongyuan Zhang, Hui-Ling Lou
Принадлежит: Marvell Asia Pte Ltd, Marvell Asia Pte, Ltd.

A communication device generates a first packet to include a first indication of one or more first frequency subchannels in a first frequency segment that will be utilized to transmit the first packet. The communication device also generates a second packet to include a second indication of one or more second frequency subchannels in a second frequency segment that will be utilized to transmit the second packet. The communication device simultaneously transmits the first packet via the first frequency segment and the second packet via the second frequency segment.

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Номер записи: 95
04-08-2015 дата публикации

Symbol vector-level combining transmitter for incremental redundancy HARQ with MIMO

Номер: US0009100065B2
Автор: Jungwon Lee, Yakun Sun, Hui-Ling Lou, LEE JUNGWON, SUN YAKUN, LOU HUI-LING
Принадлежит: Marvell World Trade Ltd., MARVELL WORLD TRADE LTD, MARVELL WORLD TRADE LTD.

Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. A set of information bits corresponding to a message may be encoded and interleaved to produce the mother code. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols.

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Номер записи: 96
20-04-2010 дата публикации

Symbol timing method and digital receiver apparatus

Номер: US0007702041B1
Автор: Songping Wu, Hui-Ling Lou, WU SONGPING, LOU HUI-LING
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

The present invention provides for receiving a radio frequency signal which encodes transmitted data, and for outputting data corresponding to the transmitted data. The radio frequency signal is received and converted to inphase and quadrature data. Phase information is extracted from the inphase and quadrature data. A symbol timing for the radio signal is determined based on the extracted phase information. The transmitted data encoded within the radio frequency signal is detected and processed based on the determined symbol timing. Data is output based on the detected and processed transmitted data. Since symbol timing is determined based on phase information, in the phase domain, a radio frequency receiver can be constructed with a lower complexity and a simpler structure.

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Номер записи: 97
24-02-2015 дата публикации

Method and apparatus for measuring interference in a communication system

Номер: US0008964911B1
Автор: Yakun Sun, Raphael Cendrillon, Mingguang Xu, Hui-Ling Lou, Christian R. Berger, Yan Zhang, SUN YAKUN, CENDRILLON RAPHAEL, XU MINGGUANG, LOU HUI-LING, BERGER CHRISTIAN R, ZHANG YAN, BERGER CHRISTIAN R.
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

Systems, methods, apparatus, and techniques are provided for receiving signals over a communications channel, generating a plurality of successive estimates of instantaneous interference present in the communications channel at a respective plurality of samples based on the received signals, producing an average interference estimate of the interference channel based on the plurality of successive estimates, and producing a decoded codeword based on i) the average interference estimate and ii) the received signals.

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Номер записи: 98
04-08-2009 дата публикации

Steering matrix feedback for beamforming

Номер: US0007570210B1
Автор: Rohit Nabar, Hui-Ling Lou, Peter Loc, NABAR ROHIT, LOU HUI-LING, LOC PETER
Принадлежит: Marvell International Ltd., MARVELL INT LTD, MARVELL INTERNATIONAL LTD.

A network device includes a calibration module that receives a first channel state information (CSI) matrix from a link partner, that determines CSI based on radio frequency (RF) signals transmitted from the link partner, and that generates a second CSI matrix that includes the CSI for the RF signals. The network device includes a first steering module that determines a first steering matrix based on the first CSI matrix, a control module that adjusts beamforming weights based on the first steering matrix, and a second steering module that determines a second steering matrix based on the second CSI matrix and that transmits the second steering matrix to the link partner.

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Номер записи: 99
11-08-2020 дата публикации

Explicit multiuser beamforming training in a wireless local area network

Номер: US0010742285B1
Автор: Liwen Chu, Yakun Sun, Rui Cao, Hongyuan Zhang, Hui-Ling Lou, CHU LIWEN, SUN YAKUN, CAO RUI, ZHANG HONGYUAN, LOU HUI-LING, Chu, Liwen, Sun, Yakun, Cao, Rui, Zhang, Hongyuan, Lou, Hui-Ling
Принадлежит: Marvell International Ltd., MARVELL INT LTD

A first communication device receives respective beamforming training data units simultaneously transmitted to the first communication device by multiple second communication devices. The first communication device generates, based on the respective beamforming training data units received from the multiple second communication devices, respective beamforming feedback data units to be transmitted to respective ones of the multiple second communication devices. The first communication device transmits the respective feedback data units to the respective ones of the multiple second communication devices.

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Номер записи: 100
07-06-2012 дата публикации

Synchronized Interference Mitigation Scheme for Heterogeneous Wireless Networks

Номер: US20120140690A1
Автор: Hui-Ling Lou, Jihwan P. Choi, Yakun Sun
Принадлежит: Marvell International Ltd

In a method of synchronizing time domain multiplexing interference mitigation schemes of at least a first, second, and third wireless communication link within a first, second, and third network, respectively, a first set of parameters defining a first set of time intervals is determined. The first set of time intervals is utilized to schedule transmissions of the first wireless communication link to reduce interference with transmissions of the second wireless communication link. A second set of parameters defining a second set of time intervals is determined. The second set of time intervals is utilized to schedule transmissions of the first wireless communication link to reduce interference with transmissions of the third wireless communication link. The second set of parameters is determined based at least in part on at least one of the first set of parameters.

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Номер записи: 101
12-07-2012 дата публикации

Wireless Network With Simultaneous Uplink Transmission of Independent Data From Multiple Client Stations

Номер: US20120177015A1
Автор: Lou Hui-Ling, Nabar Rohit U., Zhang Hongyuan
Принадлежит:

A wireless network comprises R client stations that respectively generate simultaneous uplink transmission (SUT) data, where R is an integer greater than one. An access point (AP) receives SUT data from each of the R client stations during an SUT period. 1. An access point , comprising:a medium access control module configured tocommunicate with a plurality of client stations via a channel, wherein the plurality of client stations includes a first set of client stations and a second set of client stations,designate a predetermined time period to communicate with the first set of client stations,instruct the second set of client stations to not transmit data during the predetermined time period,receive, during the predetermined time period, data transmitted by the first set of client stations without sensing the channel, andreceive, at a time other than the predetermined time period, data transmitted by the second set of client stations by sensing the channel; andan acknowledgment generating module configured to generate acknowledgements in response to receiving data from the first set of client stations.2. The access point of claim 1 , wherein the medium access control module is configured to transmit the acknowledgements to the first set of client stations during the predetermined time period.3. The access point of claim 1 , wherein the medium access control module is configured to transmit the acknowledgements to the first set of client stations in a non-overlapping manner during the predetermined time period.4. The access point of claim 1 , wherein the medium access control module is configured to:generate a single encoded acknowledgement based on the acknowledgements, andtransmit the single encoded acknowledgement to the first set of client stations during the predetermined time period.5. The access point of claim 1 , wherein the medium access control module is configured to:aggregate the acknowledgements in a single aggregated frame, wherein the single ...

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Номер записи: 102
19-07-2012 дата публикации

ACCESS POINT WITH SIMULTANEOUS DOWNLINK TRANSMISSION OF INDEPENDENT DATA FOR MULTIPLE CLIENT STATIONS

Номер: US20120182982A1
Автор: Lou Hui-Ling, Nabar Rohit U., Zhang Hongyuan
Принадлежит:

A wireless network device includes modulation modules, each configured to receive a data stream and modulate the data stream to generate a modulated data stream. A matrix module generates a multiplexing matrix based on channel conditions between the wireless network device and each of a plurality of client stations, and applies the multiplexing matrix to each of the modulated data streams to generate multiplexed data streams. The wireless network device also includes summing modules, each configured to sum at least two of the multiplexed data streams to generate a transmit data stream. A first transmitter transmits a first one of the transmit data streams during a downlink transmission period to a first one of the client stations. A second transmitter transmits a second one of the transmit data streams to a second one of the client stations while the first transmitter transmits the first one of the transmit data streams. 1a plurality of modulation modules, wherein each of the plurality of modulation modules is configured to (i) receive a data stream, and (ii) modulate the data stream to generate a modulated data stream;a matrix module configured to (i) generate a multiplexing matrix based on channel conditions between the wireless network device and each of a plurality of client stations, and (ii) apply the multiplexing matrix to each of the modulated data streams to generate multiplexed data streams;a plurality of summing modules, wherein each of the plurality of summing modules is configured to sum at least two of the multiplexed data streams to generate a transmit data stream;a first transmitter configured to transmit a first one of the transmit data streams during a downlink transmission period to a first one of the client stations; anda second transmitter configured to transmit a second one of the transmit data streams to a second one of the client stations while the first transmitter transmits the first one of the transmit data streams.. A wireless network ...

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Номер записи: 103
09-08-2012 дата публикации

PHYSICAL LAYER DATA UNIT FORMAT

Номер: US20120201276A1
Автор: Lou Hui-Ling, Nabar Rohit U., Wu Songping, Zhang Hongyuan
Принадлежит:

In a wireless communication system in which communication devices exchange information utilizing data units that conform to a first format, wherein the first format includes a short training field (STF) spread with a first spread code, a method for generating a physical layer (PHY) data unit that conforms to a second format includes generating a first portion of the PHY data unit to indicate the PHY data unit conforms to the second format. The first portion of the PHY data unit includes an STF spread with a second spread code different than the first spread code. The method also includes generating a second portion of the PHY data unit according to the second format. The second portion of the PHY data unit includes PHY information elements not specified by the first format. 1. In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format , wherein the first format includes a short training field (STF) spread with a first spread code , a method for generating a physical layer (PHY) data unit that conforms to a second format , wherein the PHY data unit is for transmitting PHY information , the method comprising:generating a first portion of the PHY data unit to indicate the PHY data unit conforms to the second format, wherein the first portion of the PHY data unit includes an STF spread with a second spread code different than the first spread code; andgenerating a second portion of the PHY data unit according to the second format, wherein the second portion of the PHY data unit includes PHY information elements not specified by the first format.2. A method according to claim 1 , wherein the second spread code is a complementary sequence of the first spread code.3. A method according to claim 2 , wherein the first spread code and the second spread code are complementary Golay sequences a and b claim 2 , respectively.4. A method according to claim 3 , wherein:the STF of the first format ...

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Номер записи: 104
09-08-2012 дата публикации

PSEUDO-OMNI-DIRECTIONAL BEAMFORMING WITH MULTIPLE NARROW-BAND BEAMS

Номер: US20120202548A1
Автор: Lee Jungwon, Lou Hui-Ling
Принадлежит:

In a technique for communication with a station on a wireless network, the technique includes forming a plurality of narrow-band beams, each having a different angular direction from an antenna of a base station and collectively distributed over a beamspace to form a pseudo-omni-directional beam pattern. That beamspace may span an entire spherical region or a portion thereof, for example, when the narrow-band beams are broadcast over a sector of an entire spherical region. The technique may assign each of the plurality of narrow-band beams to a different frequency band (such as a different channel band or sub-channel) on the wireless network. The technique may simultaneously broadcast the plurality of narrow-band beams in a time-varying manner such that the angular direction of each of the plurality of narrow-band beams varies with time, where that variation may be random or ordered. 1. An apparatus comprising:a beamform controller to determine a plurality of beamforming vectors to control an antenna of a wireless communication device, wherein the antenna is to transmit over a wireless network, and wherein the plurality of beamforming vectors are determined to assign each of a plurality of narrow-band beams, broadcast from the antenna, to a different frequency band of the wireless network,wherein each of the plurality of narrow-band beams has a different angular direction from each other of the plurality of narrow-band beams, and wherein the plurality of narrow-band beams are distributed over a beamspace to form a pseudo-omni-directional beam pattern when broadcast from the antenna, andwherein the beamform controller is further to simultaneously broadcast the plurality of narrow-band beams in a time-varying manner such that the angular direction of each of the plurality of narrow-band beams varies with time.2. The apparatus of claim 1 , wherein the time-varying manner comprises a random time-varying manner3. The apparatus of claim 1 , wherein the time-varying manner ...

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Номер записи: 105
30-08-2012 дата публикации

Efficient Physical Layer Preamble Format

Номер: US20120219017A1
Автор: Lou Hui-Ling, Nabar Rohit U., Wu Songping, Zhang Hongyuan, ZHOU QUAN
Принадлежит:

A transmitter device includes a controller configured to generate a first field and a second field. The first field is at least one of a packet synchronization information field or a frame boundary indication field, the second field is a channel estimation field starting after the first field ends. The controller is configured to generate the second field at least in part by generating a first channel estimation sequence (CES) symbol and a second CES symbol. At least one of i) a sequence in the first field serves as a cyclic prefix of the first CES symbol, ii) a beginning portion of the second CES symbol serves as a cyclic postfix of the first CES symbol, or iii) an ending portion of the first CES symbol serves as a cyclic prefix of the second CES symbol. 1. A transmitter device comprising: generate a first field, wherein the first field is at least one of a packet synchronization information field or a frame boundary indication field, and', generating a first channel estimation sequence (CES) symbol, and', 'generating a second CES symbol;, 'generate a second field, wherein the second field is a channel estimation field starting after the first field ends, and wherein the controller is configured to generate the second field at least in part by'}], 'a controller configured to'}wherein at least one of i) a sequence in the first field serves as a cyclic prefix of the first CES symbol, ii) a beginning portion of the second CES symbol serves as a cyclic postfix of the first CES symbol, or iii) an ending portion of the first CES symbol serves as a cyclic prefix of the second CES symbol.2. The transmitter device of claim 1 , wherein:the first CES symbol includes a first sequence and a second sequence augmented by a first set of cover codes; andthe second CES symbol includes the first sequence and the second sequence augmented by a second set of cover codes.3. The transmitter device of claim 2 , wherein the first sequence and the second sequence are complementary Golay ...

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Номер записи: 106
14-02-2013 дата публикации

Symbol vector-level combining receiver for incremental redundancy harq with mimo

Номер: US20130039447A1
Автор: Hui-Ling Lou, Jungwon Lee, Yakun Sun
Принадлежит: Hui-Ling Lou, Jungwon Lee, Yakun Sun

Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols.

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Номер записи: 107
14-03-2013 дата публикации

USING FREQUENCY BANDS CHARACTERIZED BY TYPE OF UNWANTED INTERFERENCE FOR COEXISTENCE AMONG MULTIPLE WIRELESS COMMUNICATION TECHNOLOGIES

Номер: US20130065533A1
Автор: Cai Ying, Choi Jihwan P., Li Chuxiang, Lou Hui-Ling, Petrovic Vladan
Принадлежит:

Apparatus having corresponding methods and computer-readable media comprise: a first transceiver comprising a controller configured to select one of a plurality of frequency regions, and a transmitter configured to transmit, according to a first protocol, first wireless signals in the one of the plurality of the frequency regions selected by the controller, wherein each frequency region is characterized by a respective type of unwanted interference generated responsive to the transmitter transmitting the first wireless signals in the respective frequency region; an arbiter configured to select one or more frequency channels based on the one of the plurality of the frequency regions selected by the controller; and a second transceiver configured to transceive, according to a second protocol, second wireless signals only in the one or more frequency channels selected by the arbiter. 1. An apparatus comprising: a controller configured to select one of a plurality of frequency regions, and', 'a transmitter configured to transmit, according to a first protocol, first wireless signals in the one of the plurality of the frequency regions selected by the controller, wherein each frequency region is characterized by a respective type of unwanted interference generated responsive to the transmitter transmitting the first wireless signals in the respective frequency region;, 'a first transceiver comprising'}an arbiter configured to select one or more frequency channels based on the one of the plurality of the frequency regions selected by the controller; anda second transceiver configured to transceive, according to a second protocol, second wireless signals only in the one or more frequency channels selected by the arbiter.2. The apparatus of claim 1 , wherein:the first protocol is a Mobile Wireless Standards (MWS) protocol; andthe second protocol is an Industrial, Scientific and Medical (ISM) band protocol.3. The apparatus of claim 1 , wherein:the first protocol is an ...

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Номер записи: 108
14-03-2013 дата публикации

USING NON-UNIFORM FREQUENCY BANDS FOR COEXISTENCE AMONG MULTIPLE WIRELESS COMMUNICATION TECHNOLOGIES

Номер: US20130065638A1
Автор: Cai Ying, Choi Jihwan P., Lou Hui-Ling, Petrovic Vladan
Принадлежит:

Apparatus having corresponding methods and computer-readable media comprise: a first transceiver comprising a controller configured to select one of a plurality of frequency regions, wherein bandwidths of the frequency regions are non-uniform, and wherein the first transceiver is configured to transceive, according to a first protocol, first wireless signals in the one of the plurality of frequency regions selected by the controller; an arbiter configured to select one or more frequency channels based on the one of the plurality of the frequency regions selected by the controller; and a second transceiver configured to transceive, according to a second protocol, second wireless signals only in the one or more frequency channels selected by the arbiter. 1. An apparatus comprising:a first transceiver comprising a controller configured to select one of a plurality of frequency regions, wherein bandwidths of the frequency regions are non-uniform, andwherein the first transceiver is configured to transceive, according to a first protocol, first wireless signals in the one of the plurality of frequency regions selected by the controller;an arbiter configured to select one or more frequency channels based on the one of the plurality of the frequency regions selected by the controller; anda second transceiver configured to transceive, according to a second protocol, second wireless signals only in the one or more frequency channels selected by the arbiter.2. The apparatus of claim 1 , wherein:the first protocol is a Mobile Wireless Standards (MWS) protocol; andthe second protocol is an Industrial, Scientific and Medical (ISM) band protocol.3. The apparatus of claim 1 , wherein:the first protocol is an Industrial, Scientific and Medical (ISM) band protocol; andthe second protocol is a Mobile Wireless Standards (MWS) protocol.4. The apparatus of claim 1 , wherein:each of the first protocol and the second protocol is an Industrial, Scientific and Medical (ISM) band protocol.5. ...

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Номер записи: 109
25-04-2013 дата публикации

SYSTEMS AND METHODS FOR SUPPRESSING INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM

Номер: US20130101060A1
Автор: Cendrillon Raphael, Lou Hui-Ling, Salhotra Atul, Sun Yakun, Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods are provided for suppressing interference from a received data signal. A characteristic of a channel is estimated, the channel being configured for transmission of data between a transmitting device and a receiving device having two or more receive antennas. A spatial correlation of interference is determined for the two or more receive antennas based on the channel characteristic. The received data signal is filtered based on the spatial correlation. 1. A method for suppressing interference from a data signal received at a receiving device , the receiving device having two or more receive antennas , the method comprising:estimating a characteristic of a channel through which the data signal was transmitted by a transmitting device to the receiving device;determining, based on the estimated characteristic of the channel, a spatial correlation of interference at the two or more receive antennas of the receiving device; andfiltering, based on the spatial correlation, the data signal received at the receiving device to suppress the interference in the data signal.2. The method of claim 1 , wherein the channel characteristic is estimated using a pilot portion of the data signal claim 1 , and wherein the pilot portion contains data that is known to both the transmitting device and the receiving device.3. The method of claim 2 , wherein determining the channel characteristic includes determining an instantaneous channel estimate using i) the known pilot portion data claim 2 , and ii) a portion of the received data signal that contains the pilot portion data.4. The method of claim 3 , wherein the instantaneous channel estimate is determined according to:{'br': None, 'i': h', 'k,t,r,s', 'y', 'k,t,r,s', 'x', 'k,t,s, '()=()/(),'}wherein h is the instantaneous channel estimate for a particular sub-carrier (k), at a particular time (t), for a particular receiving device antenna (r) and a particular transmit antenna (s);wherein y is associated with a received ...

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Номер записи: 110
25-04-2013 дата публикации

SYSTEMS AND METHODS FOR SUPPRESSING INTERFERENCE IN A SIGNAL RECEIVED BY A DEVICE HAVING TWO OR MORE ANTENNAS

Номер: US20130102256A1
Автор: Cendrillon Raphael, Choi Jiwoong, Lou Hui-Ling, Sun Yakun
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods for suppressing interference from a data signal received at a receiving device, where the receiving device has two or more receive antennas, are provided. Characteristics of a channel are estimated, the channel being a channel through which the data signal was transmitted by a transmitting device to the receiving device. A spatial correlation of interference and noise received at the two or more receive antennas of the receiving device is determined based on the estimated characteristics of the channel. The spatial correlation indicates how the interference and noise received at a particular one of the receive antennas is related to the interference and noise received at another one of the receive antennas. The spatial correlation of the interference and noise is used to suppress interference and noise from the data signal received at the receiving device. 1. A method for suppressing interference from a data signal received at a receiving device , the receiving device having two or more receive antennas , the method comprising:estimating characteristics of a channel through which the data signal was transmitted by a transmitting device to the receiving device;determining, based on the estimated characteristics of the channel, a spatial correlation of interference and noise received at the two or more receive antennas of the receiving device, the spatial correlation indicating how the interference and noise received at a particular one of the receive antennas is related to the interference and noise received at another one of the receive antennas; andusing the spatial correlation of the interference and noise to suppress interference and noise from the data signal received at the receiving device.2. The method of claim 1 , wherein determining the spatial correlation of the interference and noise comprises determining a spatial covariance matrix for the interference and noise at the two or more receive antennas.3. The method of claim 2 , wherein ...

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Номер записи: 111
09-05-2013 дата публикации

DETECTION AND ESTIMATION OF RADIO FREQUENCY VARIATIONS

Номер: US20130113645A1
Автор: Lou Hui-Ling, Nallapureddy Bhaskar W., Wu Songping, Yu Tsunglun
Принадлежит: MARVELL WORLD TRADE LTD.

A system including a sampling module that generates samples of RF signals on a first channel during first, second, and third periods, which do not overlap. A difference module determines a first difference between i) a first count of polarity reversals during the first period and ii) a second count of polarity reversals during the second period; a second difference between i) the second count and ii) a third count of polarity reversals during the third period; and a third difference between the first and second differences. A third module determines a frequency of the RF signals based on at least one of the first and second counts, determines a frequency variation of the RF signals based on the first and second counts, and identifies a radar type of the RF signals based on at least one of the third difference and the frequency variation. 1a sampling module configured to generate a plurality of samples of radio frequency signals on a first channel during each of a first period, a second period, and a third period, wherein the first period, the second period, and the third period do not overlap one another; a first difference between i) a first count of polarity reversals during the first period and ii) a second count of polarity reversals during the second period,', 'a second difference between i) the second count of polarity reversals during the second period and ii) a third count of polarity reversals during the third period, and', 'a third difference between i) the first difference and ii) the second difference; and, 'a difference module configured to determine'} determine a frequency of the radio frequency signals based on at least one of the first count and the second count,', 'determine a frequency variation of the radio frequency signals based on the first count and the second count, and', 'identify a radar type of the radio frequency signals based on at least one of the third difference and the frequency variation., 'a third module configured to'}. A system ...

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Номер записи: 112
09-05-2013 дата публикации

METHODS AND APPARATUS FOR MITIGATING KNOWN INTERFERENCE

Номер: US20130115988A1
Автор: Lou Hui-Ling, Sun Yakun
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods for mitigating known interference at a receiving device are provided. A signal from a transmission source is received by a receiving device that is affected by an interference source. At least one of a first pilot signal associated with the transmission source and a second pilot signal associated with the interfering source is determined. The first pilot signal includes information broadcast from the transmission source and the second pilot signal includes information broadcast from the interference source. Interference caused by the interference source is mitigated from the received signal using at least one of the first pilot signal and the second pilot signal. 1. A method for mitigating known interference at a receiving device , the method comprising:receiving a signal from a transmission source that is affected by an interference source;determining at least one of i) a first pilot signal associated with the transmission source, and ii) a second pilot signal associated with the interfering source, wherein the first pilot signal includes information broadcast from the transmission source and the second pilot signal includes information broadcast from the interference source;mitigating interference caused by the interference source from the received signal using at least one of i) the first pilot signal and ii) the second pilot signal.2. The method of claim 1 , wherein the mitigating interference generates an interference mitigated received signal claim 1 , and wherein the method further comprises processing the interference mitigated received signal to generate at least one of a channel estimate associated with the transmission source claim 1 , synchronization with the transmission source claim 1 , decoded data received from the transmission source claim 1 , and a signal quality indicator for the received signal.3. The method of claim 1 , wherein mitigating interference comprises:computing a channel estimate associated with the interference ...

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Номер записи: 113
27-06-2013 дата публикации

OPTIMAL LINEAR EQUALIZER FOR MIMO SYSTEMS WITH HARQ AND/OR REPETITION CODING

Номер: US20130163657A1
Автор: Jang Woong Jun, Lee Jungwon, Lou Hui-Ling
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors based on the same transmitted vector. The symbols of the received signal vectors are combined, forming a combined received signal vector that may be treated as a single received signal vector. The combined received signal vector may be equalized by, for example, a zero-forcing or minimum-mean-squared error equalizer or another suitable linear equalizer. Following equalization, the equalized signal vector may be decoded using a simple, linear decoder. 192-. (canceled)93. A method for decoding a signal vector , comprising:combining multiple signal vectors into a combined signal vector, wherein each of the multiple signal vectors corresponds to a common signal vector and is associated with a respective one of a plurality of channel response matrices;combining the plurality of channel response matrices into a combined channel response matrix;equalizing the combined signal vector based on the combined channel response matrix; andcalculating a decoding metric that includes a term based on a kth component of the equalized combined signal vector and a possible value of a kth component of the common signal vector, the term being scaled by a corresponding k,kth component of the combined channel response matrix.94. The method of further comprising receiving the multiple signal vectors using a retransmission protocol.95. The method of wherein combining the multiple signal vectors comprises combining respective symbols of the multiple signal vectors.96. The method of wherein the multiple signal vectors are combined by weighted addition claim 93 , wherein the weight for each signal vector claim 93 , i claim 93 , is H* claim 93 , the conjugate transpose of an i th channel response matrix.97. The method of claim 93 , wherein combining the plurality of channel response matrices comprises calculating {tilde over (H ...

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Номер записи: 114
29-08-2013 дата публикации

CROSS-LAYER SCHEDULING BASED ON LOWER LAYER FEEDBACK

Номер: US20130223365A1
Автор: Choi Jihwan P., Gomadam Krishna Srikanth, Han Jiwon S., Lou Hui-Ling, Sun Yakun, Xu Mingguang
Принадлежит: MARVELL WORLD TRADE LTD.

Systems, methods, apparatus, and techniques are provided for retransmitting packets of data. A Radio Link Control (RLC) layer data packet is generated, and the RLC layer data packet is converted to one or more physical (PHY) layer data packets. The one or more PHY layer data packets are transmitted. At least one of a hybrid automatic transmission request (HARQ) acknowledgement (ACK) message and a HARQ negative acknowledgment (NACK) message is received from a receiver in response to transmission of the one or more PHY layer data packets. It is determined whether the at least one of the HARQ ACK message and the HARQ NACK message represents a automatic transmission request (ARQ) ACK message or a ARQ NACK message. 1. A system for retransmitting packets of data , the system comprising;processing circuitry configured to generate a Radio Link Control (RLC) layer data packet; convert the RLC layer data packet to one or more physical (PHY) layer data packets, and', 'transmit the one or more PHY layer data packets; and, 'transmission circuitry configured to'} receive at least one of a hybrid automatic transmission request (HARQ) acknowledgement (ACK) message and a HARQ negative acknowledgment (NACK) message from a receiver in response to transmission of the one or more PHY layer data packets, and', 'determine whether the at least one of the HARQ ACK message and the HARQ NACK message represents a automatic transmission request (ARQ) ACK message or a ARQ NACK message., 'scheduling circuitry configured to'}2. The system of claim 1 , wherein the transmission circuitry is further configured to re-convert the RLC layer data packet into one or more additional PHY layer data packets in response to a determination that the at least one of the HARQ ACK message and the HARQ NACK message represents the ARQ NACK message.3. The system of claim 2 , wherein the transmission circuitry is further configured to:convert the RLC layer data packet to one or more PHY layer data packets based on (i) ...

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Номер записи: 115
05-09-2013 дата публикации

Physical Layer Frame Format Design For Wideband Wireless Communications Systems

Номер: US20130230126A1
Автор: Lou Hui-Ling, Nabar Rohit U., Palanivelu Arul Durai Murugan, Wu Songping, Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. 1. (canceled)2. A method of transmitting a signal including a payload portion and a signaling portion , the signaling portion of the signal being a single carrier signal , the payload portion of the signal being a multiple carrier signal , the method comprising:transmitting the signaling portion of the signal at a first sampling rate, the signaling portion indicating that the payload portion of the signal is the multiple carrier signal;transmitting the payload portion of the signal at a second sampling rate, the second sampling rate being different from the first sampling rate, wherein the difference between the first sampling rate and the second sampling rate causes a clock switch in the transmitted signal; andcompensating for the clock switch to cause the payload portion of the signal to be coherently demodulated at a receiver, the compensation including maintaining a coherence in carrier frequency, carrier phase, power, or timing at the clock switch.3. The method of claim 2 , further comprising: using a same or a similar carrier frequency across the signaling portion of the signal and across the payload portion of the signal, and', 'applying a same ...

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Номер записи: 116
12-09-2013 дата публикации

APPARATUS FOR GENERATING SPREADING SEQUENCES AND DETERMINING CORRELATION

Номер: US20130235908A1
Автор: Lou Hui-Ling, Nabar Rohit U., Wu Songping, Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

A circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator includes an input configured to receive an input signal, a set of delay elements, including delay elements corresponding to respective delays of 1, 2, 4, 8, 16, 32, and 64, and a set of multipliers interconnected with the input and the set of delay elements. The set of multipliers is configured to apply weight factors, and the weight factors define the sequence 1,1,−1,1,−1,1,−1. The circuit also includes a pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers. 1. A circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator , the circuit comprising:an input configured to receive an input signal;a set of delay elements, including delay elements corresponding to respective delays of 1, 2, 4, 8, 16, 32, and 64;a set of multipliers interconnected with the input and the set of delay elements, wherein the set of multipliers is configured to apply weight factors, and wherein the weight factors define the sequence 1,1,−1,1,−1,1,−1; anda pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers.2. A circuit according to claim 1 , wherein:the input signal is an impulse signal [1 0 0 . . . ]; andthe pair of outputs is configured to output the pair of complementary Golay sequences.3. A circuit according to claim 1 , wherein:the input signal is a signal received via a communication channel;the pair of outputs is configured to output the pair of correlation output signals; andthe pair of correlation output signals includes (i) a first correlation output signal ...

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Номер записи: 117
19-09-2013 дата публикации

PHYSICAL LAYER DATA UNIT FORMAT

Номер: US20130242968A1
Автор: Liu Yong, Lou Hui-Ling, Nabar Rohit U., Shen Manyuan, Wu Songping, Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

A beamforming training (BFT) data unit for transmission via a communication channel in a wireless personal area network is generated, and in particular, is for transmitting beamforming training information. A physical layer header and first BFT data are encoded using block encoding to generate a first block. Second BFT data are encoded using block encoding to generate a second block. The BFT data unit is generated with a fixed-length payload, such that the BFT data unit includes only i) a preamble, ii) the first block, and iii) the second block. 1. A method for generating a beamforming training (BFT) data unit for transmission via a communication channel in a wireless personal area network , wherein the BFT data unit is for transmitting beamforming training information , the method comprising:encoding, with a communication device, i) a physical layer header and ii) first BFT data using block encoding to generate a first block;encoding, with the communication device, second BFT data using block encoding to generate a second block; andgenerating, with the communication device, the BFT data unit with a fixed-length payload, such that the BFT data unit includes only i) a preamble, ii) the first block, and iii) the second block.2. The method of claim 1 , further comprising padding claim 1 , with the communication device claim 1 , the first BFT data with zeros prior to block encoding.3. The method of claim 2 , further comprising padding claim 2 , with the communication device claim 2 , the second BFT data with zeros prior to block encoding.4. The method of claim 1 , further comprising padding claim 1 , with the communication device claim 1 , the first BFT data and the second BFT data with zeros prior to block encoding so that the first BFT data and the second BFT data fit within the fixed-length payload.5. The method of claim 1 , wherein block encoding is performed using low density parity check (LDPC) encoding.6. The method of claim 1 , wherein block encoding is ...

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Номер записи: 118
03-10-2013 дата публикации

Cell deployment with different channel bandwidth for carrier aggregation

Номер: US20130258936A1
Автор: Hui-Ling Lou, Jihwan P. Choi, Qing Zhao
Принадлежит: MARVELL WORLD TRADE LTD

Systems, methods, apparatus, and techniques are provided for transmitting information to user equipment (UE) in a communications network. Data is generated in (i) a first frequency range associated with a first set of carriers and (ii) a second frequency range associated with a second set of carriers, where the first frequency range specifies a first communications cell and the second frequency range specifies a second communications cell. The first cell is assigned as a primary cell to a first set of UEs in the communications network. Control data is transmitted to both the first set of UEs and a second set of UEs using at least a portion of the first set of carriers.

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Номер записи: 119
10-10-2013 дата публикации

Method And Apparatus For Jointly Performing Channel Estimation And Interference Estimation In A Wireless Communication System

Номер: US20130266100A1
Автор: Cendrillon Raphael, Gomadam Krishna Srikanth, Lou Hui-Ling, Sun Yakun
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods for estimating characteristics of a channel are provided. A transmission of known reference data is received at a receiving device. The reference data is transmitted over the channel that includes one or more desired layers and one or more interfering layers. Characteristics of the channel are determined based on the known reference data, where the determining includes a joint estimation of the one or more desired layers and the one or more interfering layers. The determining includes selecting certain of the layers to be estimated at each of the known reference data and selecting certain of the layers to be estimated over a range of the known reference data. The determining includes solving an equation to jointly estimate the one or more desired layers and the one or more interfering layers based on the selections. The selections reduce a number of unknown values in the equation. 1. A method for estimating characteristics of a channel , the method comprising:receiving a transmission of known reference data at a receiving device, wherein the reference data is transmitted over the channel that includes one or more desired layers and one or more interfering layers; and selecting certain of the layers to be estimated at each of the known reference data,', 'selecting certain of the layers to be estimated over a range of the known reference data, and', 'solving an equation to jointly estimate the one or more desired layers and the one or more interfering layers based on the selections, the selections reducing a number of unknown values in the equation., 'determining characteristics of the channel based on the known reference data, the determining including a joint estimation of the one or more desired layers and the one or more interfering layers, and the determining including'}2. The method of claim 1 , further comprising:determining the range of the known reference data for the certain layers based on a frequency or a time over which the layers are ...

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Номер записи: 120
10-10-2013 дата публикации

SYSTEM AND METHOD OF PERFORMING IDLE MODE SIGNALING REDUCTION IN MULTI-RADIO ACCESS TECHNOLOGY CELLULAR NETWORKS

Номер: US20130267234A1
Автор: Choi Jihwan P., Han Jiwon S., Lou Hui-Ling
Принадлежит: MARVELL WORLD TRADE LTD.

A method includes performing a handover for a mobile device between first and second RAT networks. The first RAT network has a tracking area. The second RAT network has a routing area. Idle mode signaling reduction is activated in the mobile device including activating first and second timers respectively for the first and second RAT networks. In response to either one of the first and second timers expiring, a tracking or routing area update is sent to a first base station. The first base station is in the first RAT network or the second RAT network. The first timer is reset while the second timer maintains a set offset from the first timer. The tracking area update indicates that the mobile device has performed a handover to the first RAT network. The routing area update indicates that the mobile device has handed over to the second RAT network. 1. A method comprising:performing a handover for a mobile device between a first radio access technology network and a second radio access technology network, wherein the first radio access technology network has a tracking area, and wherein the second radio access technology network has a routing area;activating idle mode signaling reduction in the mobile device, wherein activating the idle mode signaling reduction in the mobile device including activating (i) a first timer for the first radio access technology network, and (ii) a second timer for the second radio access technology network;in response to either one of the first timer and the second timer expiring, sending a tracking area update or a routing area update to a first base station, wherein the first base station is in the first radio access technology network or the second radio access technology network; andresetting the first timer while the second timer maintains a set offset from the first timer,wherein the tracking area update indicates that the mobile device has performed a handover to the first radio access technology network, andwherein the routing ...

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Номер записи: 121
07-11-2013 дата публикации

SCHEDULING SCHEMES FOR USER EQUIPMENT POWER SAVING IN A COMMUNICATION NETWORK

Номер: US20130294309A1
Автор: Choi Jihwan P., Lou Hui-Ling
Принадлежит: MARVELL WORLD TRADE LTD.

In a method of allocating wireless medium resources in a communication system, the communication system including a base station and a plurality of client stations sharing a channel bandwidth, a frequency sub-band of the channel bandwidth is selected for allocating wireless medium resources to a client station. Wireless medium resources are allocated at the base station to the client station. The base station is constrained to allocate wireless medium resources to the client station within the selected frequency sub-band. A subframe is generated for transmission to the client station. The subframe includes at least a data region that contains data for the client station. The data for the client station is confined to be within the selected frequency sub-band. 1. A method of allocating wireless medium resources in a communication system , the communication system including a base station and a plurality of client stations sharing a channel bandwidth , the method comprising:selecting, for allocating wireless medium resources to a client station, a frequency sub-band of the channel bandwidth;allocating, at the base station, wireless medium resources to the client station, wherein the base station is constrained to allocate wireless medium resources to the client station within the selected frequency sub-band; andgenerating a subframe for transmission to the client station, wherein the subframe includes at least a data region, and wherein the data region contains data for the client station, the data for the client station confined to be within the selected frequency sub-band.2. The method of claim 1 , wherein the subframe further includes a control region claim 1 , wherein the control region indicates the allocated wireless medium resources to the client station claim 1 , and wherein the control region spans the channel bandwidth.3. The method of claim 1 , wherein the subframe further includes a control region claim 1 , wherein the control region indicates the ...

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Номер записи: 122
12-12-2013 дата публикации

Techniques for Flexible and Efficient Beamforming

Номер: US20130329718A1
Автор: Banerjea Raja, Liu Yong, Lou Hui-Ling, Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

Training data for a first training session is generated to include a first data unit, the first data unit having a field that specifies a first number of beamforming training data units that can be communicated during a second training session to occur after the first training session. The training data including the first data unit is transmitted to a second device during the first training session. A second data unit received from the second device is processed to determine whether a request for the second device to participate in the second training session was accepted by the second device based on a first field of the second data unit. In response to determining that the request to participate in the second training session was accepted by the second device, the first number of beamforming training data units are transmitted during the second training session. 1. A method comprising:generating, at a first device, training data for a first training session between the first device and a second device, the training data including a first data unit to be transmitted during the first training session, wherein generating the first data unit includes generating a field of the first data unit that specifies a first number of beamforming training data units that can be communicated during a second training session to occur after the first training session, wherein the field of the first data unit that specifies the first number of beamforming training data units corresponds to a request for the second device to participate in the second training session;causing the training data including the first data unit to be transmitted from the first device to the second device during the first training session;processing, at the first device, a second data unit received by the first device, wherein the second data unit includes a response, by the second device, to the request, in the first data unit, for the second device to participate in the second training session, wherein ...

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Номер записи: 123
02-01-2014 дата публикации

Sounding and Steering Protocols for Wireless Communications

Номер: US20140003384A1
Автор: Liu Yong, Lou Hui-Ling, Nabar Rohit U., Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

Systems, apparatuses, and techniques relating to wireless local area network devices are described. A described technique includes transmitting a sounding packet to wireless communication devices; receiving, in response to the sounding packet, feedback packets from the wireless communication devices, wherein the feedback packets are indicative of beamforming matrices, the beamforming matrices being derived from received versions of the sounding packet; determining steering matrices based on the beamforming matrices; generating spatially steered data packets for the wireless communication devices based respectively on the steering matrices and data streams intended respectively for the wireless communication devices; and transmitting, within a frame, the spatially steered data packets to the wireless communications devices, wherein the spatially steered data packets concurrently provide the data streams respectively within the frame to the wireless communication devices via different spatial wireless channels. 120.-. (canceled)21. A method , comprising:transmitting a sounding packet to wireless communication devices;receiving, in response to the sounding packet, feedback packets from the wireless communication devices, wherein the feedback packets are indicative of beamforming matrices, the beamforming matrices being derived from received versions of the sounding packet;determining steering matrices based on the beamforming matrices;generating spatially steered data packets for the wireless communication devices based respectively on the steering matrices and data streams intended respectively for the wireless communication devices; andtransmitting, within a frame, the spatially steered data packets to the wireless communications devices, wherein the spatially steered data packets concurrently provide the data streams respectively within the frame to the wireless communication devices via different spatial wireless channels.22. The method of claim 21 , wherein the ...

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Номер записи: 124
09-01-2014 дата публикации

COMMUNICATING BROADCAST SIGNALS IN CARRIER-AGGREGATED WIRELESS NETWORKS

Номер: US20140010139A1
Автор: Choi Jihwan P., Lou Hui-Ling
Принадлежит:

A method is implemented in a communication device operating in a carrier aggregation mode utilizing a plurality of component carriers, where the plurality of component carriers includes at least (i) a primary component carrier associated with a primary cell and a primary cell broadcast message channel, and (ii) a secondary component carrier associated with a secondary cell and a secondary cell broadcast message channel. The method includes receiving, at the communication device, a broadcast message associated with the primary cell via (i) the primary cell broadcast message channel or (ii) the secondary cell broadcast message channel, decoding, at the communication device, the received broadcast message associated with the primary cell, receiving, at the communication device, a broadcast message associated with the secondary cell via the secondary cell broadcast message channel, and decoding, at the communication device, the received broadcast message associated with the secondary cell. 1. A method , implemented in a communication device operating in a carrier aggregation mode utilizing a plurality of component carriers , wherein the plurality of component carriers includes at least (i) a primary component carrier associated with a primary cell and a primary cell broadcast message channel , and (ii) a secondary component carrier associated with a secondary cell and a secondary cell broadcast message channel , the method comprising:receiving, at the communication device, a broadcast message associated with the primary cell via (i) the primary cell broadcast message channel or (ii) the secondary cell broadcast message channel;decoding, at the communication device, the received broadcast message associated with the primary cell;receiving, at the communication device, a broadcast message associated with the secondary cell via the secondary cell broadcast message channel; anddecoding, at the communication device, the received broadcast message associated with the ...

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Номер записи: 125
13-02-2014 дата публикации

USER MOBILITY CONTROL FOR HETEROGENEOUS WIRELESS NETWORKS

Номер: US20140045498A1
Автор: Cai Ying, Choi Jihwan P., Lou Hui-Ling, Sun Yakun
Принадлежит: MARVELL WORLD TRADE LTD.

In a wireless network including a first cell and a second cell, it is determined whether a measure of mobility of a user device meets a mobility criterion, and it is determined whether a size of the second cell meets a cell size criterion. When it is determined that (i) the measure of mobility of the user device meets the mobility criterion and (ii) the size of the second cell meets the cell size criterion, the user device is prevented from being switched from the first cell to the second cell, or at least one of (i) a handover parameter or (ii) a cell reselection parameter is adjusted in order to change a probability that the user device will switch from the first cell to the second cell. 1. A method of controlling a switching of a user device from a first cell to a second cell in a wireless network , the method comprising:determining whether a measure of mobility of the user device meets a mobility criterion;determining whether a size of the second cell meets a cell size criterion; and preventing the user device from being switched from the first cell to the second cell, or', 'adjusting at least one of (i) a handover parameter or (ii) a cell reselection parameter in order to change a probability that the user device will switch from the first cell to the second cell., 'when it is determined that (i) the measure of mobility of the user device meets the mobility criterion and (ii) the size of the second cell meets the cell size criterion,'}2. A method according to claim 1 , further comprising preventing the first cell from issuing a handover command to the user device when it is determined that (i) the measure of mobility of the user device meets the mobility criterion and (ii) the size of the second cell meets the cell size criterion.3. A method according to claim 1 , further comprising claim 1 , when it is determined that (i) the measure of mobility of the user device meets the mobility criterion and (ii) the size of the second cell meets the cell size criterion ...

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Номер записи: 126
06-03-2014 дата публикации

Method and Apparatus for Detecting and Processing a Retransmitted Data Packet in a Wireless Network

Номер: US20140064098A1
Автор: Choi Jihwan P., Han Jiwon S., Lou Hui-Ling
Принадлежит: MARVELL WORLD TRADE LTD.

The present disclosure describes systems and techniques relating to wireless communications. According to an aspect of the described systems and techniques, an apparatus includes circuitry configured to receive a signal representing a wireless communication transmission; and circuitry configured to process the signal to (i) decode a control portion of the wireless communication transmission, (ii) determine from the decoded control portion that a data portion of the wireless communication transmission was successfully decoded previously and acknowledged, and so the wireless communication transmission is an unnecessary retransmission, and (iii) trigger acknowledgement of the wireless communication transmission being successfully decoded, without completing a decode of the data portion of the wireless communication transmission, when the unnecessary retransmission is detected. 1. An apparatus comprising:circuitry configured to receive a signal representing a wireless communication transmission; andcircuitry configured to process the signal to (i) decode a control portion of the wireless communication transmission, (ii) determine from the decoded control portion that a data portion of the wireless communication transmission was successfully decoded previously and acknowledged, and so the wireless communication transmission is an unnecessary retransmission, and (iii) trigger acknowledgement of the wireless communication transmission being successfully decoded, without completing a decode of the data portion of the wireless communication transmission, when the unnecessary retransmission is detected.2. The apparatus of claim 1 , wherein the circuitry configured to process the signal triggers the acknowledgement of the wireless communication transmission before the decode of the data portion of the wireless communication transmission is begun.3. The apparatus of claim 1 , wherein the circuitry configured to process the signal initiates an alternate transmission claim 1 , ...

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Номер записи: 127
13-03-2014 дата публикации

METHOD AND APPARATUS FOR TRANSMITTING FIRST DATA STREAMS VIA RESPECTIVE TRANSMITTERS TO MULTIPLE CLIENTS STATIONS DURING A SAME PERIOD AND SUCCESSIVELY TRANSMITTING SECOND DATA STREAMS

Номер: US20140071973A1
Автор: Lou Hui-Ling, Nabar Rohit U., Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

An access point including a first transmitter and a second transmitter. The first transmitter is configured to (i) during a first window, transmit a first data stream to a first client station, and (ii) during a second window, transmit a second data stream to a second client station. The second transmitter is configured to: during the first window and while the first transmitter transmits the first data stream to the first client station, transmit a third data stream to a third client station; during a first portion of the second window and while the first transmitter is transmitting the second data stream to the second client station, refrain from transmitting a fourth data stream to a fourth client station; and subsequent to the first transmitter completing the transmission of the second data stream and during a second portion of the second window, transmit the fourth data stream to the fourth client station. 1. An access point comprising:a first transmitter configured to (i) during a first window, transmit a first data stream to a first client station, and (ii) during a second window, transmit a second data stream to a second client station; and during the first window and while the first transmitter transmits the first data stream to the first client station, transmit a third data stream to a third client station,', 'during a first portion of the second window and while the first transmitter is transmitting the second data stream to the second client station, refrain from transmitting a fourth data stream to a fourth client station, and', 'subsequent to the first transmitter completing the transmission of the second data stream to the second client station and during a second portion of the second window, transmit the fourth data stream to the fourth client station., 'a second transmitter configured to'}2. The access point of claim 1 , further comprising a control module configured to determine whether the first client station and the third client station are ...

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Номер записи: 128
13-03-2014 дата публикации

Physical Layer Frame Format Design for Wideband Wireless Communications Systems

Номер: US20140072080A1
Автор: Arul Durai Murugan Palanivelu, Hongyuan Zhang, Hui-Ling Lou, Rohit U. Nabar, Songping Wu
Принадлежит: Marvell International Ltd

Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal.

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Номер записи: 129
20-03-2014 дата публикации

METHOD AND SYSTEM FOR DETECTING SYNCHRONIZATION SIGNALS IN A MOBILE COMMUNICATIONS PROTOCOL

Номер: US20140078961A1
Автор: Lou Hui-Ling, Shen Manyuan, SONG Leilei, Xiao Chusong, Zhao Qing
Принадлежит: MARVELL WORLD TRADE LTD.

A method of detecting a secondary synchronization signal in a received signal having desired primary and secondary synchronization signals, and interfering primary and secondary synchronization signals, includes providing information regarding primary synchronization signal location and, based on the information regarding primary synchronization signal location, performing successive interference cancellation to remove the interfering secondary synchronization signals for detecting the desired secondary synchronization signal, without performing successive interference cancellation on the primary synchronization signals. Apparatus for detecting a secondary synchronization signal in a received signal having (i) desired primary and secondary synchronization signals and (ii) interfering primary and secondary synchronization signals includes a source of information regarding primary synchronization signal location, and successive interference cancellation circuitry. The successive interference cancellation circuitry uses the information regarding primary synchronization signal location to remove interfering secondary synchronization signals for detecting the desired secondary synchronization signal, without performing successive interference cancellation on the primary synchronization signals. 1. A method of detecting a secondary synchronization signal in a received signal having desired primary and secondary synchronization signals and interfering primary and secondary synchronization signals , the method comprising:providing information regarding primary synchronization signal location; andbased on the information regarding primary synchronization signal location, performing successive interference cancellation to remove the interfering secondary synchronization signals for detecting the desired secondary synchronization signal, without performing successive interference cancellation on the primary synchronization signals.2. The method of claim 1 , wherein providing ...

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Номер записи: 130
03-01-2019 дата публикации

SOUNDING AND TONE BLOCK ALLOCATION FOR ORTHOGONAL FREQUENCY MULTIPLE ACCESS (OFDMA) IN WIRELESS LOCAL AREA NETWORKS

Номер: US20190007251A1
Автор: Chu Liwen, Lou Hui-Ling, Sun Yakun, Zhang Hongyuan
Принадлежит:

A first communication device transmits a null data packet (NDP) to multiple second communication devices. The NDP spans a channel frequency bandwidth. The first communication device receives a plurality of sounding feedback packets from the second communication devices. Each sounding feedback packet includes one or more signal-to-noise ratio (SNR) indicators corresponding to one or more respective groups of orthogonal frequency division multiplexing (OFDM) subcarriers, and the SNR indicators correspond to reception of the NDP at the plurality of second communication devices. Each sounding feedback packet in the plurality of sounding feedback packets includes a respective indication of OFDM subcarriers for which the sounding feedback packet includes SNR information, and at least one sounding feedback packet from among the plurality of sounding feedback packets does not include SNR information for all OFDM subcarriers via which the NDP was transmitted. 1. A method for simultaneously communicating with multiple communication devices in a communication network , the method comprising:transmitting, by a first communication device, a null data packet (NDP) to a plurality of second communication devices, wherein the NDP spans a channel frequency bandwidth, and wherein the NDP is transmitted via a plurality of orthogonal frequency division multiplexing (OFDM) subcarriers that span the channel frequency bandwidth; wherein each sounding feedback packet includes one or more signal-to-noise ratio (SNR) indicators corresponding to one or more respective groups of OFDM subcarriers from among the plurality of OFDM subcarriers,', 'wherein the SNR indicators correspond to reception of the NDP at the plurality of second communication devices,', 'wherein each sounding feedback packet in the plurality of sounding feedback packets includes a respective indication of OFDM subcarriers for which the sounding feedback packet includes SNR information, and', 'wherein at least one sounding ...

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Номер записи: 131
20-01-2022 дата публикации

COORDINATED MULTI-USER TRANSMISSIONS WITH MULTIPLE ACCESS POINTS

Номер: US20220021418A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A first access point (AP), which is associated with one or more first client stations, receives an announcement frame from a second AP that is associated with one or more second client stations. The announcement frame announces a coordinated multi-user (MU) transmission involving at least the first AP and the second AP, includes an indicator of a frequency resource unit (RU) allocated to the first AP for the coordinated MU transmission. The first AP participates in the coordinated MU transmission using the frequency RU indicated by the announcement frame while the second AP also participates in the coordinated MU transmission. 1. A method for wireless communication by a first access point (AP) associated with one or more first client stations , the method comprising:receiving, at the first AP, an announcement frame from a second AP associated with one or more second client stations, the announcement frame announcing a coordinated multi-user (MU) transmission involving at least the first AP and the second AP, wherein the announcement frame includes an indicator of a frequency resource unit (RU) allocated to the first AP for the coordinated MU transmission; andparticipating, by the first AP, in the coordinated MU transmission using the frequency RU indicated by the announcement frame while the second AP also participates in the coordinated MU transmission.2. The method of claim 1 , wherein participating in the coordinated MU transmission comprises:transmitting, by the first AP, a first downlink (DL) transmission to at least one first client station among the one or more first client stations, while the second AP transmits a second DL transmission to at least one second client station among the one or more second client stations.3. The method of claim 2 , further comprising:determining, at the first AP, a first frequency RU based on the indicator, in the announcement frame, of the RU allocated to the first AP;wherein transmitting the first DL transmission comprises ...

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Номер записи: 132
21-01-2016 дата публикации

Methods and Apparatus for Enabling Spontaneous Location Determination in a Scheduled Wireless Communication Environment

Номер: US20160021496A1
Автор: Chu Liwen, Lou Hui-Ling, Tamhane Sagar A., Wagholikar Sarang Shrikrishna, Zhang Hongyuan
Принадлежит:

The present disclosure describes methods and apparatus for enabling spontaneous location determination in a scheduled wireless communication environment. For example embodiments, a first wireless communication device includes a transceiver and a multiple recipient communication system. The transceiver is configured to receive from a second wireless communication device a request to participate in a location determination procedure (LDP) that is to occur at least partially during a communication period that is assigned to a third wireless communication device. The multiple recipient communication system is configured to generate a multiple recipient frame that encapsulates (i) data that is destined for the third wireless communication device and (ii) a response to the request to participate in the LDP. For other example embodiments, a multiple recipient communication system of the second wireless communication device is configured to extract the response to the request to participate in the LDP from the multiple recipient frame. 1. A first wireless communication device comprising:a transceiver configured to receive, from a second wireless communication device, a request to participate in a location determination procedure that is to occur at least partially during a communication period that is assigned to a third wireless communication device; anda multiple recipient communication system configured to generate a multiple recipient frame that encapsulates (i) data that is destined for the third wireless communication device and (ii) a response to the request to participate in the location determination procedure, wherein the response is destined for the second wireless communication device.2. The first wireless communication device of claim 1 , wherein the request to participate in the location determination procedure comprises a fine timing measurement request frame claim 1 , and the communication period that is assigned to the third wireless communication device ...

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Номер записи: 133
21-01-2016 дата публикации

CHANNEL FRAME STRUCTURES FOR HIGH EFFICIENCY WIRELESS LAN (HEW)

Номер: US20160021682A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Sun Yakun, Wang Lei, Xu Mingguang, Zhang Hongyuan
Принадлежит:

An high efficiency wireless local area network access point including a channel access module and a scheduling module. The channel access module accesses a channel of an unlicensed frequency band, which includes a plurality of subchannels. The scheduling module generates a schedule for a plurality of high efficiency wireless local area network client stations to transmit data to the access point via the channel of the unlicensed frequency band. The schedule includes information for the plurality of client stations regarding (i) a time slot in which to access the channel without contention to transmit data to the access point via the channel, (ii) a subchannel of the plurality of subchannels to use during the time slot to transmit data to the access point, and (iii) one or more spatial streams to use on the subchannel and during the time slot to transmit data to the access point. 1. An access point comprising:a channel access module configured to access a channel of an unlicensed frequency band, wherein the channel of the unlicensed frequency band includes a plurality of subchannels; anda scheduling module configured to generate a schedule for a plurality of client stations to transmit data to the access point via the channel of the unlicensed frequency band,wherein the schedule includes information for the plurality of client stations regarding (i) a time slot in which to access the channel without contention to transmit data to the access point via the channel of the unlicensed frequency band, (ii) a subchannel of the plurality of subchannels of the unlicensed frequency band to use during the time slot to transmit data to the access point, and (iii) one or more spatial streams to use on the subchannel and during the time slot to transmit data to the access point,wherein the access point includes a high efficiency wireless local area network access point configured to communicate with the plurality of client stations in a wireless local area network operating in the ...

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Номер записи: 134
17-04-2014 дата публикации

BICM DECODING IN THE PRESENCE OF CO-CHANNEL INTERFERENCE

Номер: US20140105337A1
Автор: Lee Jungwon, Lou Hui-Ling, Nabar Rohit U.
Принадлежит: MARVELL WORLD TRADE LTD.

Systems and methods are provided for computing soft information for digital information based on a received signal, where the received signal suffers from noise and interference. A receiver that decodes the received signal may estimate channel information, such as the channel gain, associated with the interfering source. The receiver may also obtain modulation information through a backbone network or by decoding control information transmitted by the interfering source. Using the modulation information and the channel information, the receiver may estimate the effect that interference has on the received signal, and may compute soft information (e.g., a log-likelihood ratio) for the digital information. 120-. (canceled)21. A method of computing soft information for use in estimating digital information from an intended source , the method comprising:estimating interference channel information associated with at least one interfering source;estimating intended channel information associated with the intended source;determining intended modulation information associated with the intended source;receiving a signal corresponding to the digital information; andcomputing soft information for the digital information from the signal based on the interference channel information, the intended channel information and the intended modulation information.22. The method of claim 21 , further comprising:receiving a pilot signal from a channel associated with the intended source,wherein estimating the intended channel information comprises determining a magnitude and phase of the received pilot signal, andwherein determining the intended modulation information comprises decoding the received pilot signal to identify a modulation scheme used by the intended source.23. The method of claim 22 , wherein estimating the interference channel information comprises:computing an estimate of a channel gain associated with the at least one interfering source.24. The method of claim 23 , ...

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Номер записи: 135
28-01-2016 дата публикации

GROUP ACKNOWLEDGEMENT FOR MULTIPLE USER COMMUNICATION IN A WIRELESS LOCAL AREA NETWORK

Номер: US20160028452A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Wang Lei, Zhang Hongyuan
Принадлежит:

In a method for simultaneously communicating with multiple communication devices in a wireless local area network a first communication device receives a plurality of uplink data units simultaneously transmitted by multiple second communication devices. The first communication device generates an acknowledgement data unit to acknowledge receipt of the multiple data units simultaneously transmitted by multiple second communication devices. The acknowledgement data unit includes (i) an indication that indicates that the acknowledgement data unit is intended for multiple second communication devices and (ii) respective acknowledgement information for the multiple second communication devices. The acknowledgement data unit is transmitted from the first communication device to the multiple second communication devices. 1. A method for simultaneously communicating with multiple communication devices in a wireless local area network , the method comprising:receiving, at a first communication device, a plurality of uplink data units simultaneously transmitted by multiple second communication devices;generating, at the first communication device, an acknowledgement data unit to acknowledge receipt of the multiple data units simultaneously transmitted by multiple second communication devices, wherein the acknowledgement data unit includes (i) an indication that indicates that the acknowledgement data unit is intended for multiple second communication devices and (ii) respective acknowledgement information for the multiple second communication devices; andcausing the acknowledgement data unit to be transmitted from the first communication device to the multiple second communication devices.2. The method of claim 1 , whereinthe multiple second communication devices are included in a multi-user multiple input multiple output (MU-MIMO) group, andreceiving, at the first communication device, a plurality of uplink data units simultaneously transmitted by multiple second ...

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Номер записи: 136
23-01-2020 дата публикации

ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS FOR WIRELESS LOCAL AREA NETWORK

Номер: US20200029333A1
Автор: Chu Liwen, Lou Hui-Ling, Sun Yakun, Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

A first communication device determines assignment of at least a first orthogonal frequency division multiplex (OFDM) tone block and a second OFDM tone block for communication with a second communication device in a wireless local area network (WLAN). The first OFDM tone block is separated from the second OFDM tone block by a gap in frequency. The first communication device generates a physical layer (PHY) data unit for transmission to the second communication device, including generating a data portion of the PHY data unit that spans the first OFDM tone block and the second OFDM tone block. The first communication device transmits the PHY data unit to the second communication device via the first OFDM tone block and the second OFDM tone block such that no data is transmitted in the third OFDM tone block for the data portion of the PHY data unit. 1determining, at a first communication device, assignment of at least a first orthogonal frequency division multiplex (OFDM) tone block and a second OFDM tone block for communication with a second communication device in a wireless local area network (WLAN), wherein the first OFDM tone block is separated from the second OFDM tone block by a gap in frequency; and 'generating a data portion of the PHY data unit that spans the first OFDM tone block and the second OFDM tone block; and', 'generating, at the first communication device, a physical layer (PHY) data unit for transmission to the second communication device, includingtransmitting, by the first communication device, the PHY data unit to the second communication device via the first OFDM tone block and the second OFDM tone block such that no data is transmitted in the third OFDM tone block for the data portion of the PHY data unit.. A method, comprising: This application is a continuation of U.S. patent application Ser. No. 15/983,524, now U.S. Pat. No. 10,433,309, entitled “Orthogonal Frequency Division Multiple Access for Wireless Local Area Network,” filed on May 18, ...

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Номер записи: 137
30-01-2020 дата публикации

Wireless Local Area Network Management

Номер: US20200037325A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

An access point generates a management communication frame, that includes information indicating network parameters of a wireless communication network, for transmission in an operating channel of the wireless communication network. The operating channel including i) at least one primary component channel used at least for synchronizing with client stations associated with the access point and ii) at least one scanning channel specified, by the first communication protocol, to be used for scanning by client stations not associated with the access point. The access point generates a physical layer data unit to include the management communication frame, and transmits the physical layer data unit in the at least one scanning channel, specified by the first communication protocol, to allow discovery of the wireless communication network by client stations that are not associated with the access point. 1. A method for announcing presence of a wireless communication network managed by an access point configured for operating according to at least a first communication protocol , the method comprising:generating, at the access point, a management communication frame that includes information indicating network parameters of the wireless communication network, the management communication frame includes information announcing an operating channel of the wireless communication network, the operating channel including i) at least one primary component channel used at least for synchronizing with client stations associated with the access point and ii) at least one scanning channel specified, by the first communication protocol, to be used for scanning by client stations not associated with the access point;generating, at the access point, a physical layer data unit to include the management communication frame; andtransmitting, by the access point, the physical layer data unit, to allow discovery of the wireless communication network by client stations that are not ...

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Номер записи: 138
30-01-2020 дата публикации

MEDIUM PROTECTION IN WIRELESS LOCAL AREA NETWORKS

Номер: US20200037357A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A communication device generates a first data unit that spans a first bandwidth, and transmits the first data unit during a transmit opportunity (TXOP) to at least one other communication device. The communication device subsequently determines, based on respective values of TXOP duration fields included in respective physical layer (PHY) preambles of one or more data units previously transmitted during the TXOP, whether a second bandwidth of a second data unit to be transmitted by the communication device during the TXOP can be greater than the first bandwidth of the first data unit. In response to determining that the second bandwidth of the second data unit can be greater than the first bandwidth of the first data unit, the communication device generates the second data unit to span the second bandwidth greater than the first bandwidth, and transmits the second data unit during the TXOP. 1. A method for transmitting multiple data units in a communication channel , the method comprising:generating, at a communication device, a first data unit to be transmitted during a transmit opportunity (TXOP) obtained by the communication device, the first data unit generated to span a first bandwidth;transmitting, by the communication device, the first data unit during the TXOP to at least one other communication device;determining, at the communication device based on respective values of TXOP duration fields included in respective physical layer (PHY) preambles of one or more data units previously transmitted during the TXOP, whether a second bandwidth of a second data unit to be transmitted during the TXOP by the communication device can be greater than the first bandwidth of the first data unit transmitted during the TXOP by the communication device;in response to determining that the second bandwidth of the second data unit transmitted during the TXOP can be greater than the first bandwidth of the first data unit transmitted during the TXOP, generating, at the ...

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Номер записи: 139
09-02-2017 дата публикации

Methods and apparatus for mitigating known interference

Номер: US20170041030A1
Автор: Hui-Ling Lou, Yakun Sun
Принадлежит: MARVELL WORLD TRADE LTD

Systems and methods for mitigating known interference at a receiving device are provided. A signal from a transmission source is received by a receiving device that is affected by an interference source. At least one of a first pilot signal associated with the transmission source and a second pilot signal associated with the interfering source is determined. The first pilot signal includes information broadcast from the transmission source and the second pilot signal includes information broadcast from the interference source. Interference caused by the interference source is mitigated from the received signal using at least one of the first pilot signal and the second pilot signal.

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Номер записи: 140
09-02-2017 дата публикации

SOUNDING AND TONE BLOCK ALLOCATION FOR ORTHOGONAL FREQUENCY MULTIPLE ACCESS (OFDMA) IN WIRELESS LOCAL AREA NETWORKS

Номер: US20170041174A1
Автор: Chu Liwen, Lou Hui-Ling, Sun Yakun, Zhang Hongyuan
Принадлежит:

A first communication device receives sounding feedback packets from a plurality of second communication devices, wherein each sounding feedback packet includes one or more channel quality indicators (CQIs) corresponding to one or more groups of orthogonal frequency division multiplexing (OFDM) subcarriers associated with the corresponding second communication device. The first communication device allocates groups of subcarriers to second communication devices in a group for orthogonal frequency division multiple access (OFDMA) communication, and the first communication device uses the received CQIs to allocate the groups of subcarriers. The first communication device transmits at least one OFDMA data unit that includes respective data directed to the two or more second communication devices of the group, where the respective data are transmitted via respective groups of subcarriers that were allocated to the two or more second communication devices by the first communication device using the received CQIs. 1. A method for simultaneously communicating with multiple communication devices in a communication network , the method comprising:receiving, at a first communication device, sounding feedback packets from a plurality of second communication devices, wherein each sounding feedback packet includes (i) beamforming feedback to be used by the first communication device for beamforming to the corresponding second communication device, and (ii) one or more channel quality indicators (CQIs) corresponding to one or more groups of orthogonal frequency division multiplexing (OFDM) subcarriers associated with the corresponding second communication device;allocating, at the first communication device, groups of subcarriers to second communication devices in a group of second communication devices for orthogonal frequency division multiple access (OFDMA) communication, wherein the group of second communication devices includes two or more second communication devices of the ...

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Номер записи: 141
11-02-2016 дата публикации

USER MOBILITY CONTROL FOR HETEROGENEOUS WIRELESS NETWORKS

Номер: US20160044557A1
Автор: Cai Ying, Choi Jihwan P., Lou Hui-Ling, Sun Yakun
Принадлежит:

In a wireless network including a first cell and a second cell, it is determined whether a measure of mobility of a user device meets a mobility criterion, and it is determined whether a size of the second cell meets a cell size criterion. When it is determined that (i) the measure of mobility of the user device meets the mobility criterion and (ii) the size of the second cell meets the cell size criterion, the user device is prevented from being switched from the first cell to the second cell, or at least one of (i) a handover parameter or (ii) a cell reselection parameter is adjusted in order to change a probability that the user device will switch from the first cell to the second cell. 1. A method of controlling a switching of a user device from a first cell to a second cell in a wireless network , the method comprising:determining whether speed information corresponding to a velocity of the user device meets a threshold that was determined based on a size of the second cell;determining whether the size of the second cell meets a cell size criterion; and 'preventing the user device from being switched from the first cell to the second cell.', 'when it is determined that (i) the speed information meets the threshold and (ii) the size of the second cell meets the cell size criterion,'}2. The method of claim 1 , wherein preventing the user device from being switched from the first cell to the second cell includes:preventing the first cell from issuing a handover command to the user device.3. The method of claim 1 , wherein preventing the user device from being switched from the first cell to the second cell includes:preventing, at a base station serving the first cell, the user device from at least one of (i) performing a handover measurement corresponding to the second cell, or (ii) performing a cell reselection measurement corresponding to the second cell.4. The method of claim 1 , wherein preventing the user device from being switched from the first cell to the ...

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Номер записи: 142
19-02-2015 дата публикации

Efficient formats of beacon, announcement, and beamforming training frames

Номер: US20150049744A1
Автор: Harish Ramamurthy, Hongyuan Zhang, Hui-Ling Lou, Raja Banerjea, Yong Liu
Принадлежит: MARVELL WORLD TRADE LTD

A method includes generating a first data unit to be transmitted during a first time period to one or several stations assumed to be beamformed, including determining a time interval that separates the first time period from a second time period, such that a second data unit is transmitted during the second time period to one or several stations assumed to be beamformed, and generating a parameter indicative of the time interval, such that the first data unit includes the parameter.

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Номер записи: 143
07-02-2019 дата публикации

ACKNOWLEDGEMENT FOR MULTIPLE USER COMMUNICATION IN A WLAN

Номер: US20190045513A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Wang Lei, Zhang Hongyuan
Принадлежит:

An access point generates and transmits, to first client stations and a second client station, a downlink multi-user (MU) physical layer (PHY) data unit having respective media access control (MAC) data units for i) the first client stations and ii) the second client station. The downlink MU PHY data unit includes an indication that the first client stations are to acknowledge the downlink MU PHY data unit in an uplink MU PHY data unit, and indicates that the second client station is to acknowledge the downlink MU PHY data unit in another uplink PHY data unit separate from the uplink MU PHY data unit. The access point receives, from the multiple first client stations, the uplink MU PHY data unit, and polls the second client station to prompt the second client station to acknowledge, in another uplink PHY data unit, that the second client station received the downlink MU PHY data unit. 1. A method for communicating in a wireless communication network , the method comprising:generating, at an access point, a downlink multi-user (MU) physical layer (PHY) data unit having respective media access control (MAC) data units for i) multiple first client stations and ii) a second client station; includes an indication that the multiple first client stations are to acknowledge the respective MAC data units for the multiple first client stations in an uplink MU PHY data unit, and', 'indicates that the second client station is to acknowledge the MAC data unit for the second client station in another uplink PHY data unit separate from the uplink MU PHY data unit;, 'transmitting, by the access point, the downlink MU PHY data unit to the multiple first client stations and the second client station, wherein the downlink multi-user PHY data unit'}receiving, at the access point from the multiple first client stations, the uplink MU PHY data unit, the uplink MU PHY data unit corresponding to the acknowledgment of the respective MAC data units by the multiple first client stations; ...

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Номер записи: 144
18-02-2016 дата публикации

SYSTEMS AND METHODS FOR MANAGING COEXISTENCE IN WIRELESS COMMUNICATION DEVICES

Номер: US20160050668A1
Автор: Cai Ying, Choi Jihwan P., Lou Hui-Ling, Petrovic Vladan
Принадлежит:

A wireless communication device first and second transceivers to transmit in respective first and second frequency bands. The device includes an arbiter to map the first frequency band into a plurality of regions and sub-regions and map a plurality of channels to the sub-regions, and a first controller to select one of the plurality of sub-regions and inform the arbiter of the selected one of the plurality of sub-regions. The arbiter is further to select a first group of channels in the second frequency band when the selected one of the plurality of sub-regions is a first sub-region, select a second group of channels in the second frequency band when the selected one of the plurality of sub-regions is a second sub-region, and select a third group of channels in the second frequency band when the selected one of the plurality of sub-regions is a third sub-region. 1. A wireless communication device , comprising:a first transceiver to transmit and receive first signals according to a first protocol, wherein the first protocol is associated with a first frequency band;a second transceiver to transmit and receive second signals according to a second protocol, wherein the second protocol is associated with a second frequency band adjacent to the first frequency band;an arbiter to (i) map the first frequency band into a plurality of regions, (ii) map the plurality of regions to a plurality of sub-regions such that each region includes a plurality of the sub-regions, and (iii) map a plurality of channels in the first frequency band to the sub-regions; anda first controller associated with the first transceiver, the first controller to (i) select one of the plurality of sub-regions, and (ii) inform the arbiter of the selected one of the plurality of sub-regions, wherein the first transceiver is further to transmit and receive the first signals in a first channel of the plurality of channels corresponding to the selected one of the plurality of sub-regions, (i) map a first ...

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Номер записи: 145
18-02-2021 дата публикации

BEACONING AND CAPABILITY AND BASIC SERVICE SET PARAMETER ANNOUNCEMENT FOR MULTI-BAND OPERATION

Номер: US20210051574A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

Operating a wireless communications network includes transmitting a management frame by a first multi-link entity of a set of entities using a reporting link associated with a first network identifier and a first communication band. The management frame includes first information associated with the first multi-link entity and second information associated with a second link of the set of entities. The second link is associated with a second network identifier. 1. A method for operating a wireless communications network comprising:transmitting a management frame by a first multi-link entity of a set of entities using a reporting link associated with a first network identifier and a first communication band, the management frame including first information associated with the first multi-link entity and second information associated with a second link of the set of entities,wherein the second link is associated with a second network identifier.2. The method claim 1 , as recited in claim 1 , wherein the first information includes capability or operation parameter information for the reporting link and the second information includes second capability or operation parameter information for the second link claim 1 , the second link being associated with the first multi-link entity.3. The method claim 1 , as recited in claim 1 , wherein the first information includes capability or operation parameter information for a first plurality of links of the multi-link entity and the second information includes second capability or operation parameter information for the second link claim 1 , the second link being associated with a second entity of the set of entities.4. The method claim 3 , as recited in claim 3 , wherein the second entity is a second multi-link entity and the second information includes operation parameters for each link of the second multi-link entity.5. The method claim 1 , as recited in claim 1 , further comprising:changing an operation mode of the reporting ...

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Номер записи: 146
16-02-2017 дата публикации

SUB-CHANNEL ALLOCATION IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEX WLAN

Номер: US20170047972A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Sun Yakun, Wang Lei, Zhang Hongyuan
Принадлежит:

A first communication device receives one or more downlink orthogonal frequency division multiplexing (OFDM) data units transmitted by a second communication device via one or more respective sub-channels of an OFDM communication channel. The first communication device identifies the one or more sub-channels of the OFDM communication channel on which the one or more downlink OFDMA data units were transmitted, and determines whether each of the one or more sub-channels on which the one or more downlink OFDMA data units were transmitted is busy. The first communication device generates an uplink OFDM data unit for each sub-channel determined to be not busy, and transmits each of the uplink OFDM data units to the second communication device via the corresponding sub-channel. 1. A method for simultaneous communication with multiple communication devices in a wireless local area network , the method comprising:receiving, at a first communication device, one or more downlink orthogonal frequency division multiplexing (OFDM) data units transmitted by a second communication device via one or more respective sub-channels of an OFDM communication channel;identifying, by the first communication device, the one or more sub-channels of the OFDM communication channel on which the one or more downlink OFDMA data units were transmitted;determining, by the first communication device, whether each of the one or more sub-channels on which the one or more downlink OFDMA data units were transmitted is busy;generating, by the first communication device, an uplink OFDM data unit for each sub-channel determined to be not busy; andtransmitting each of the uplink OFDM data units to the second communication device via the corresponding sub-channel.2. The method of claim 1 , wherein the one or more downlink OFDM data units comprise synchronization frames and the one or more uplink OFDM data units comprise one or more aggregate media access control protocol data units (A-MPDU).3. The method of ...

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Номер записи: 147
16-02-2017 дата публикации

Physical Layer Data Unit Format for a Wireless Communication Network

Номер: US20170048095A1
Автор: AU Kwok S., Lou Hui-Ling, Sun Yakun, Zhang Hongyuan
Принадлежит:

In a method for generating a data unit, it is determined whether the data unit is to be transmitted using single carrier (SC) modulation or orthogonal frequency division (OFDM) modulation. When it is determined that the data unit is to be transmitted using SC modulation, a header field of the data unit is generated using a first technique to indicate that the data unit conforms to a first protocol and/or whether the data unit conforms to a first PHY mode or a second PHY mode of the first protocol. When it is determined that the data unit is to be transmitted using OFDM modulation, the header field is generated using a second technique to indicate that the data unit conforms to the first protocol and/or whether the data unit conforms to the first PHY mode or the second PHY mode of the first protocol. 1. A method for generating a data unit for transmission via a communication channel , the method comprising:determining, at a network interface of a communication device, whether the data unit is to be transmitted using single carrier (SC) modulation or using orthogonal frequency division (OFDM) modulation; when it is determined that the data unit is to be transmitted using SC modulation, generating the header field using a first technique to indicate one or both of (i) that the data unit conforms to a first communication protocol and not a second communication protocol and (ii) whether the data unit conforms to a first PHY mode of the first communication protocol or a second PHY mode of the first communication protocol, and', 'when it is determined that the data unit is to be transmitted using OFDM modulation, generating the header field using a second technique to indicate one or both of (i) that the data unit conforms to the first communication protocol and not the second communication protocol and (ii) whether the data unit conforms to the first PHY mode of the first communication protocol or the second PHY mode of the first communication protocol;, 'generating, at ...

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Номер записи: 148
16-02-2017 дата публикации

ACKNOWLEDGEMENT FOR MULTIPLE USER COMMUNICATION IN A WLAN

Номер: US20170048866A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Wang Lei, Zhang Hongyuan
Принадлежит:

A first communication device generates a multi-user (MU) physical layer (PHY) data unit having independent data for multiple second communication devices. The first communication device also generates respective control frames to prompt second communication devices to transmit an orthogonal frequency division multiple access (OFDMA) PHY data unit to acknowledge that the second communication devices received the MU PHY data unit. The MU PHY data unit and the respective control frames are transmitted to the multiple second communication devices. The first communication device receives the OFDMA PHY data unit from at least some of the second communication devices. The first communication device processes the OFDMA PHY data unit to determine whether the multiple second communication devices received the MU PHY data unit. 1. A method for communicating in a wireless communication network , the method comprising:generating, at a first communication device, a multi-user (MU) physical layer (PHY) data unit having independent data for multiple second communication devices;generating, at the first communication device, respective control frames corresponding to at least some of the second communication devices, wherein the respective control frames are configured to prompt the at least some of the second communication devices to transmit an orthogonal frequency division multiple access (OFDMA) PHY data unit to acknowledge that the at least some of the second communication devices received the MU PHY data unit;transmitting, with the first communication device, the MU PHY data unit to the multiple second communication devices;transmitting, with the first communication device, the respective control frames to the multiple second communication devices;receiving, at the first communication device, the OFDMA PHY data unit from the at least some of the second communication devices, the OFDMA PHY data unit corresponding to an acknowledgment of the single MU PHY data unit by the at ...

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Номер записи: 149
14-02-2019 дата публикации

MULTI-USER NULL DATA PACKET (NDP) RANGING

Номер: US20190052428A1
Автор: BERGER Christian R., Chu Liwen, GRANDHE Niranjan, Lou Hui-Ling, Srinivasa Sudhir, Zhang Hongyuan
Принадлежит:

A first communication device prompts a plurality of second communication devices to transmit, during a contiguous time period reserved for a range measurement exchange, respective first null data packets (NDPs) at respective times. The first communication device receives first NDPs from at least some of the second communication devices during the contiguous time period, and transmits one or more second NDPs to the plurality of second communication devices. The first communication device uses reception of the first NDPs and transmission of the one or more second NDPs to determine respective ranges between the first communication device and respective second communication devices. 1. A method for performing a ranging measurement procedure , the method comprising:prompting, at a first communication device, a plurality of second communication devices to transmit, during a contiguous time period reserved for a range measurement exchange, respective first null data packets (NDPs) at respective times;receiving, at the first communication device, first NDPs from at least some of the second communication devices during the contiguous time period;transmitting, by the first communication device, one or more second NDPs to the plurality of second communication devices; andusing, at the first communication device, reception of the first NDPs and transmission of the one or more second NDPs to determine respective ranges between the first communication device and respective second communication devices.2. The method of claim 1 , wherein prompting the plurality of second communication devices to transmit the respective first NDPs comprises:transmitting, by the first communication device, a plurality of packets that include respective trigger frames, wherein the packets that include respective trigger frames are transmitted at respective times, and wherein each trigger frame is configured to prompt a respective set of one or more second communication devices to transmit one or more ...

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Номер записи: 150
15-05-2014 дата публикации

Pseudo-Omni-Directional Beamforming with Multiple Narrow-Band Beams

Номер: US20140134956A1
Автор: Lee Jungwon, Lou Hui-Ling
Принадлежит: MARVELL WORLD TRADE LTD.

In a technique for communication with a station on a wireless network, the technique includes forming a plurality of narrow-band beams, each having a different angular direction from an antenna of a base station and collectively distributed over a beamspace to form a pseudo-omni-directional beam pattern. That beamspace may span an entire spherical region or a portion thereof, for example, when the narrow-band beams are broadcast over a sector of an entire spherical region. The technique may assign each of the plurality of narrow-band beams to a different frequency band (such as a different channel band or sub-channel) on the wireless network. The technique may simultaneously broadcast the plurality of narrow-band beams in a time-varying manner such that the angular direction of each of the plurality of narrow-band beams varies with time, where that variation may be random or ordered. 1. A mobile station in a wireless network , the mobile station comprising:an antenna to receive a pseudo-omni-directional beam pattern, the pseudo-omni-directional beam pattern containing a plurality of narrow-band beams each for a different frequency band of the wireless network; and determine a feedback signal indicating a characteristic property for each narrow-band beam in the pseudo-omni-directional beam pattern, and', 'transmit, to a base station, the feedback signal indicating the characteristic property for each narrow-band beam in the pseudo-omni-directional beam pattern, wherein the characteristic property for each narrow-band beam in the pseudo-omni-directional beam pattern is useable by the base station for scheduling communications between the base station and the mobile station., 'a controller to'}2. The mobile station of claim 1 , wherein the pseudo-omni-directional beam pattern varies in a time-varying manner.3. The mobile station of claim 1 , wherein the plurality of narrow-band beams each have a different angular direction and are collectively distributed over a ...

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Номер записи: 151
10-03-2022 дата публикации

SIMULTANEOUS TRANSMISSION IN MULTIPLE FREQUENCY SEGMENTS

Номер: US20220078730A1
Автор: CAO Rui, Chu Liwen, Lou Hui-Ling, Zhang Hongyuan, Zhang Yan
Принадлежит:

A communication device generates a first packet for transmission in a first frequency segment, and generates a first physical layer (PHY) preamble of the first packet to include a first field that indicates a first overall bandwidth that the first packet spans. The communication device generates a second packet for transmission in a second frequency segment, and generates a second PHY preamble of the second packet to include a second field that indicates a second overall bandwidth that the second packet spans. The communication device transmits the first packet in the first frequency segment beginning at a first time, and simultaneously transmits the second packet in the second frequency segment beginning at a second time that is different than the first time. 1. A method for simultaneously transmitting in a plurality of frequency segments , comprising:generating, at a communication device, a first packet for transmission in a first frequency segment, including generating a first physical layer (PHY) preamble of the first packet to include a first field that indicates a first overall bandwidth that the first packet spans;generating, at the communication device, a second packet for transmission in a second frequency segment, including generating a second PHY preamble of the second packet to include a second field that indicates a second overall bandwidth that the second packet spans; and{'claim-text': ['transmitting the first packet in the first frequency segment beginning at a first time, and', 'transmitting the second packet in the second frequency segment beginning at a second time that is different than the first time.'], '#text': 'simultaneously transmitting, by the communication device, the first packet in the first frequency segment and the second packet in the second frequency segment, including:'}2. The method of claim 1 , wherein:generating the first packet comprises generating the first PHY preamble of the first packet to further include a third field that ...

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Номер записи: 152
01-03-2018 дата публикации

HIGH EFFICIENCY ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) PHYSICAL LAYER (PHY)

Номер: US20180062899A1
Автор: CAO Rui, Lou Hui-Ling, Sun Yakun, Xu Mingguang, Zhang Hongyuan
Принадлежит:

A communication device determines that an extension field should be included in physical layer (PHY) data unit to provide a receiver with more processing time to process data included in the PHY data unit, wherein the extension field is not required to be processed by the receiver. The communication device generates i) a PHY preamble of the PHY data unit, and ii) a PHY data portion of the PHY data unit, the PHY data unit conforming to a first communication protocol. Each orthogonal frequency division multiplexing (OFDM) symbol in the PHY data portion is generated with a first tone spacing, which is a fraction 1/N of a second tone spacing defined by a second communication protocol, wherein N is a positive integer greater than one. The communication device also generates the extension field of the PHY data unit, which is appended to an end of the PHY data portion. 1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel , the data unit conforming to a first communication protocol , the method comprising:determining, at a communication device, that an extension field should be included in the PHY data unit to provide a receiver with more processing time to process data included in the PHY data unit, wherein the extension field is not required to be processed by the receiver;generating, at the communication device, a PHY preamble of the PHY data unit;generating, at the communication device, a PHY data portion of the PHY data unit, including generating one or more orthogonal frequency division multiplexing (OFDM) symbols, wherein each OFDM symbol of the one or more OFDM symbols is generated with a first tone spacing, wherein the first tone spacing is a fraction 1/N of a second tone spacing, the second tone spacing defined by a second communication protocol, wherein N is a positive integer greater than one; andgenerating, at the communication device, the extension field of the PHY data unit, the extension field being ...

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Номер записи: 153
01-03-2018 дата публикации

METHOD AND APPARATUS FOR CONTROL FRAME EXTENSION

Номер: US20180063297A1
Автор: Chu Liwen, Lou Hui-Ling, Tamhane Sagar A., Zhang Hongyuan
Принадлежит: Marvel International Ltd.

Aspects of the disclosure provide an apparatus having a processing circuit and a transceiver. The processing circuit is configured to generate a frame to have an extended subtype under a control type, configure a media access control (MAC) header of the frame to indicate an extended control frame format, and configure a field of the frame to be an extended subtype field according to the extended control frame format to carry an identification for the extended subtype. The extended subtype is defined in addition to a plurality of subtypes that are identifiable using a subtype field in the frame according to a control frame format. The transceiver is configured to transmit signals to carry the frame. 1. An apparatus , comprising:a processing circuit configured to generate a frame to have an extended subtype under a control type, configure a media access control (MAC) header of the frame to indicate an extended control frame format, and configure a field of the frame to be an extended subtype field according to the extended control frame format to carry an identification for the extended subtype, the extended subtype being defined in addition to a plurality of subtypes that are identifiable using a subtype field in the frame according to a control frame format; anda transceiver configured to transmit signals to carry the frame.2. The apparatus of claim 1 , wherein the processing circuit is configured to fill in the subtype field in the frame with a value that is predefined to indicate the extended control frame format.3. The apparatus of claim 2 , wherein the processing circuit is configured to configure a field outside of the MAC header to be the extended subtype field.4. The apparatus of claim 1 , wherein the processing circuit is configured to fill in a type field in the MAC header of the frame with a specific value that is predefined to indicate the control type claim 1 , and the extended control frame format.5. The apparatus of claim 4 , wherein the processing ...

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Номер записи: 154
08-03-2018 дата публикации

Multi-User Ranging with Unassociated Stations

Номер: US20180070330A1
Автор: BERGER Christian R., Chu Liwen, GRANDHE Niranjan, Lou Hui-Ling, Tamhane Sagar A., Zhang Hongyuan
Принадлежит:

A first communication i) selects one or more respective preliminary identifiers (IDs) for one or more second communication devices, or ii) receives one or more respective preliminary IDs from one or more second communication devices, the one or more respective preliminary IDs having been respectively selected by the one or more second communication devices. The first communication device generates a trigger frame, the trigger frame indicating one or more first frequency resource and/or spatial stream allocations to one or more second communication devices using the one or more respective preliminary IDs. The first communication device transmits the trigger frame to initiate at least an uplink (UL) MU transmission by multiple second communication devices for a ranging procedure. 1. A method for multi-user (MU) communications in a wireless communication network , the MU communications between a first communication device that manages the wireless communication network and a plurality of second communication devices , wherein a first set of one or more second communication devices is not associated with the wireless communication network and has not been assigned association identifiers (IDs) by the first communication device , and wherein a second set of one or more second communication devices is associated with the wireless communication network and has been assigned association IDs by the first communication device , the method comprising:one of i) selecting, at the first communication device, one or more respective preliminary IDs for one or more second communication devices in the first set, or ii) receiving, at the first communication device, one or more respective preliminary IDs from one or more second communication devices in the first set, the one or more respective preliminary IDs having been respectively selected by the one or more second communication devices in the first set;generating, at the first communication device, a trigger frame, the trigger ...

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Номер записи: 155
11-03-2021 дата публикации

MULTI-USER NULL DATA PACKET (NDP) RANGING

Номер: US20210075575A1
Автор: BERGER Christian R., Chu Liwen, GRANDHE Niranjan, Lou Hui-Ling, Srinivasa Sudhir, Zhang Hongyuan
Принадлежит:

A first communication device prompts a plurality of second communication devices to transmit, during a contiguous time period reserved for a range measurement exchange, respective first null data packets (NDPs) at respective times. The first communication device receives first NDPs from at least some of the second communication devices during the contiguous time period, and transmits one or more second NDPs to the plurality of second communication devices. The first communication device uses reception of the first NDPs and transmission of the one or more second NDPs to determine respective ranges between the first communication device and respective second communication devices. 120-. (canceled)21. A method for performing a ranging measurement procedure , the method comprising:determining, by a first communication device, a plurality of second communication devices from a plurality of third communication devices to transmit first null data packets (NDPs);prompting, at a first communication device, the selected plurality of second communication devices to transmit, during a contiguous time period reserved for a range measurement exchange, the respective first NDPs at respective times, wherein remaining communication devices of the plurality of third communications are not prompted to transmit during the contiguous time period the first NDPs;receiving, at the first communication device, the first NDPs from at least some of the selected second communication devices during the contiguous time period, wherein the first NDPs are received at a respective receive power within the receive power range;transmitting, by the first communication device, one or more second NDPs to the selected plurality of second communication devices; andusing, at the first communication device, reception of the first NDPs to determine respective ranges between the first communication device and respective selected second communication devices.22. The method of wherein the using includes using ...

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Номер записи: 156
19-03-2015 дата публикации

ACCESS POINT COORDINATION FOR TRAFFIC CONTROL IN WIRELESS NETWORKS

Номер: US20150078353A1
Автор: Lou Hui-Ling, Sun Yakun, Zhang Hongyuan
Принадлежит:

A presence of interference between a first wireless network and a second wireless network is determined. Transmissions in the first wireless network are coordinated with transmissions in the second wireless network to reduce interference between the first wireless network and the second wireless network. Transmissions in the first wireless network are scheduled based on the coordinating to reduce interference between the first wireless network and the second wireless network. 1. A method for reducing interference in wireless communications , the method comprising:determining, by a communication device of or communicatively coupled to a first wireless network, a presence of interference between the first wireless network and a second wireless network;coordinating, with the first communication device, transmissions in the first wireless network with transmissions in the second wireless network to reduce interference between the first wireless network and the second wireless network; andscheduling, at a first access point, transmissions in the first wireless network, based on the coordinating to reduce interference between the first wireless network and the second wireless network.2. The method of claim 1 , wherein coordinating transmissions in the first wireless network with transmissions in the second wireless network comprises:determining first time slots in which transmissions in the first wireless network are to occur; anddetermining second time slots in which transmissions in the first wireless network are not to occur.3. The method of claim 2 , wherein scheduling transmissions in the first wireless network comprises:establishing, with the first access point, transmit opportunity (TxOP) periods corresponding to the second time slots to prevent stations in the first wireless network from transmitting during the second time slots.4. The method of claim 3 , wherein establishing TxOP periods comprises:transmitting, with the first access point one or more clear-to- ...

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Номер записи: 157
11-03-2021 дата публикации

ACKNOWLEDGMENT DATA UNIT FOR MULTIPLE UPLINK DATA UNITS

Номер: US20210076439A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Wang Lei, Zhang Hongyuan
Принадлежит:

A method for simultaneously communicating with multiple communication devices in a wireless local area network is described. Multiple uplink data units are received that are simultaneously transmitted by multiple second communication devices. The multiple uplink data units include a management data unit and a traffic data unit. An acknowledgment data unit is generated to acknowledge receipt of the multiple data units. The acknowledgment data unit includes (i) an indication that indicates that the acknowledgment data unit is intended for the multiple second communication devices, and (ii) respective acknowledgment information fields for the multiple second communication devices. The respective acknowledgment information fields include a first acknowledgment information field for the management data unit and a second acknowledgment information field for the traffic data unit. The acknowledgment data unit is caused to be transmitted from the first communication device to the multiple second communication devices. 124-. (canceled)25. A method for transmitting data in a wireless network , the method comprising:generating, at a communication device, an aggregated medium access control (MAC) protocol data unit (A-MPDU) to be included in a first physical layer (PHY) protocol data unit (PPDU), wherein the A-MPDU is generated to comprise a plurality of subframes, including: two or more first subframes each having a) a respective end of frame (EOF) subfield set to one, b) a respective length subfield set to a respective value greater than zero, and c) a respective first data MAC protocol data unit (MPDU);wherein the method further comprises transmitting the first PPDU;receiving, at the communication device, a second PPDU beginning at the predefined time period after the end of the first PPDU, wherein the second PPDU includes an acknowledgment frame;wherein the A-MPDU is generated to further include a plurality of second subframes that include a plurality of second data MPDUs ...

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Номер записи: 158
15-03-2018 дата публикации

UPLINK MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT FOR WIRELESS LOCAL AREA NETWORK

Номер: US20180076860A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A first communication device transmits a first communication frame that includes scheduling information corresponding to a time period in which an uplink multi-user transmission is to occur. The scheduling information indicates a start time of the time period. The first communication frame includes an indication of a group of two or more second communication devices that are to transmit simultaneously during the time period as part of the uplink multi-user transmission. The first communication device transmits a second communication frame during the time period. The second communication frame is configured to trigger at least some second communication device in the group of two or more second communication devices to transmit simultaneously as part of the uplink multi-user transmission. The first communication device receives the uplink multi-user transmission during the time period, the uplink multi-user transmission being responsive to the second communication frame. 1. A method , comprising:transmitting, by a first communication device, a first communication frame that includes scheduling information corresponding to a time period in which an uplink multi-user transmission is to occur, wherein the scheduling information indicates a start time of the time period, and wherein the first communication frame includes an indication of a group of two or more second communication devices that are to transmit simultaneously during the time period as part of the uplink multi-user transmission;transmitting, by the first communication device, a second communication frame during the time period, wherein the second communication frame is configured to trigger at least some second communication device in the group of two or more second communication devices to transmit simultaneously as part of the uplink multi-user transmission; andreceiving, at the first communication device, the uplink multi-user transmission during the time period, wherein the uplink multi-user transmission ...

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Номер записи: 159
05-03-2020 дата публикации

SPATIAL REUSE TRANSMISSIONS IN WIRELESS LOCAL AREA NETWORKS (WLANS)

Номер: US20200077404A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Wang Lei, Zhang Hongyuan
Принадлежит:

A first communication device in a first wireless network determines a transmit power for transmitting a first packet during a spatial reuse opportunity corresponding to a transmission in a second wireless network. Determining the transmit power includes using a spatial reuse parameter, indicative of an acceptable interference level in the second wireless network, included in a second packet transmitted by a second communication device in the second wireless network. The first communication device generates the first packet to include information to indicate to a third communication device, that is an intended receiver of the first packet, to not transmit an acknowledgment of the first packet according to a normal acknowledgment procedure during the spatial reuse opportunity. The first communication device transmits the first packet at the determined transmit power, and receives the acknowledgement from the third communication device, the acknowledgement having not been transmitted according to the normal acknowledgment procedure. 1determining, at a first communication device in a first wireless network, a transmit power for transmitting a first packet during a spatial reuse opportunity corresponding to a transmission in a second wireless network, wherein determining the transmit power includes using a spatial reuse parameter included in a second packet transmitted by a second communication device in the second wireless network, wherein the spatial reuse parameter is indicative of an acceptable interference level in the second wireless network;generating, at the first communication device, the first packet to include information to indicate to a third communication device that the third communication device is not to transmit a third packet according to a normal acknowledgment procedure during the spatial reuse opportunity, wherein the third communication device is an intended receiver of the first packet, and wherein the third packet is an acknowledgment of the ...

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Номер записи: 160
24-03-2016 дата публикации

UPLINK MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT FOR WIRELESS LOCAL AREA NETWORK

Номер: US20160087700A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A communication device of a client uplink group transmits an enhanced request to send (E-RTS) message to an access point of a wireless local area network, wherein the E-RTS message includes i) a length of a TXOP of the communication device and ii) an indication of a data unit size for an uplink MU-MIMO data unit to be transmitted by the communication device simultaneously with transmissions of other members of the client uplink group. The communication device receives a communication frame from the access point, the communication frame including a prompt to transmit an uplink MU-MIMO data unit having the indicated data unit size. The communication device generates the uplink MU-MIMO data unit having the indicated data unit size, and transmits, in response to the communication frame, the uplink MU-MIMO data unit to the access point during the TXOP simultaneously with transmissions of other members of the client uplink group. 1. A method , comprising:transmitting, by a communication device of a client uplink group, an enhanced request to send (E-RTS) message to an access point of a wireless local area network, wherein the E-RTS message includes i) a length of a transmission opportunity (TXOP) of the communication device and ii) an indication of a data unit size for an uplink MU-MIMO data unit to be transmitted by the communication device simultaneously with transmissions of other members of the client uplink group;receiving a communication frame from the access point, the communication frame including a prompt to transmit an uplink MU-MIMO data unit having the indicated data unit size;generating the uplink MU-MIMO data unit having the indicated data unit size; andtransmitting, by the communication device and in response to the communication frame, the uplink MU-MIMO data unit to the access point during the TXOP simultaneously with transmissions of other members of the client uplink group.2. The method of claim 1 , wherein generating the uplink MU-MIMO data unit ...

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Номер записи: 161
22-03-2018 дата публикации

Spatial Reuse Transmissions in WLANS

Номер: US20180084554A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Wang Lei, Zhang Hongyuan
Принадлежит:

A first communication device in a first wireless network determines a transmit power for transmitting a first packet during a spatial reuse opportunity corresponding to a transmission in a second wireless network. Determining the transmit power includes using a spatial reuse parameter, indicative of an acceptable interference level in the second wireless network, included in a second packet transmitted by a second communication device in the second wireless network. The first communication device generates the first packet to include information to indicate to a third communication device, that is an intended receiver of the first packet, to not transmit an acknowledgment of the first packet according to a normal acknowledgment procedure during the spatial reuse opportunity. The first communication device transmits the first packet at the determined transmit power, and receives the acknowledgement from the third communication device, the acknowledgement having not been transmitted according to the normal acknowledgment procedure. 1. A method , comprising:determining, at a first communication device in a first wireless network, a transmit power for transmitting a first packet during a spatial reuse opportunity corresponding to a transmission in a second wireless network, wherein determining the transmit power includes using a spatial reuse parameter included in a second packet transmitted by a second communication device in the second wireless network, wherein the spatial reuse parameter is indicative of an acceptable interference level in the second wireless network;generating, at a first communication device, the first packet to include information to indicate to a third communication device that the third communication device should not transmit a third packet according to a normal acknowledgment procedure during the spatial reuse opportunity, wherein the third communication device is an intended receiver of the first packet, and wherein the third packet is an ...

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Номер записи: 162
24-03-2016 дата публикации

RANGE EXTENSION MODE FOR WIFI

Номер: US20160087827A1
Автор: Lou Hui-Ling, Yong Su Khiong, Zhang Hongyuan
Принадлежит:

A first plurality of OFDM symbols for a first field of a preamble to be included in a data unit that conforms to a first communication protocol are generated, wherein each OFDM symbol of the first plurality of OFDM symbols corresponds to a first long training sequence that is obtained at least by multiplying a predetermined sequence with a second long training sequence defined by a second communication protocol. A first plurality of modified constellation symbols are generated, including multiplying the first plurality of constellation symbols by the predetermined sequence. A second plurality of OFDM symbols are generated to include the first plurality of modified constellation symbols. The preamble is generated to include the first plurality of OFDM symbols for the first field and the second plurality of OFDM symbols for the second field, and the data unit to include at least the preamble. 1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel , the PHY data unit conforming to a first communication protocol , the method comprising:generating a first plurality of orthogonal frequency division multiplexing (OFDM) symbols for a first field of a preamble to be included in the PHY data unit, wherein each OFDM symbol of the first plurality of OFDM symbols corresponds to a first long training sequence of the first communication protocol that is obtained at least by multiplying a predetermined sequence with a second long training sequence of a second communication protocol;encoding a first plurality of information bits for a second field of the preamble to generate a first plurality of encoded bits;mapping the first plurality of encoded bits to a first plurality of constellation symbols;generating a first plurality of modified constellation symbols, including multiplying the first plurality of constellation symbols by the predetermined sequence;generating a second plurality of orthogonal frequency division multiplexing ( ...

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Номер записи: 163
24-03-2016 дата публикации

ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS FOR WIRELESS LOCAL AREA NETWORK

Номер: US20160088628A1
Автор: Chu Liwen, Lou Hui-Ling, Sun Yakun, Zhang Hongyuan
Принадлежит:

A plurality of different OFDM tone blocks for a wireless local area network (WLAN) communication channel are assigned to a plurality of devices. An OFDMA data unit is generated, the OFDMA unit including a preamble portion and a data portion, the preamble portion having at least i) a first legacy portion that corresponds to at least a first OFDM tone block, ii) a second legacy portion that corresponds to a second OFDM tone block, iii) a first non-legacy portion that corresponds to the first OFDM tone block, iv) a second non-legacy portion that corresponds to the second OFDM tone block, and v) a third non-legacy portion that corresponds to a third OFDM tone block. The first OFDM tone block and the second OFDM tone block are separated in frequency by at least the third OFDM tone block. 1. A method , comprising:assigning a plurality of different orthogonal frequency division multiplex (OFDM) tone blocks for a wireless local area network (WLAN) communication channel to a plurality of devices including a first device and second device, wherein the plurality of different OFDM tone blocks includes at least a first OFDM tone block and a second OFDM tone block assigned to the first device and a third OFDM tone block assigned to the second device, wherein the first OFDM tone block and the second OFDM tone block are separated in frequency by at least the third OFDM tone block; and the first legacy portion is modulated on at least the first OFDM tone block,', 'the first non-legacy portion is modulated on the first OFDM tone block,', 'the second legacy portion is modulated on at least the second OFDM tone block,', 'the second non-legacy portion is modulated on the second OFDM tone block, and', 'the third non-legacy portion is modulated on the third OFDM tone block., 'generating an orthogonal frequency division multiple access (OFDMA) data unit for the WLAN communication channel, the OFDMA unit including a preamble portion and a data portion, the preamble portion having at least i ...

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Номер записи: 164
12-03-2020 дата публикации

Signaling of Wireless Station Capabilities

Номер: US20200084302A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

Communication apparatus includes a transceiver configured to transmit and receive signals over a wireless channel in accordance with both a first communication protocol and a second communication protocol, the second communication protocol being backward-compatible with the first communication protocol. The transceiver is configured to provide capabilities that are supported by the second communication protocol but are not supported by the first communication protocol. A communication controller is configured to generate data frames for transmission by the transceiver. The date frames include frame headers that are compatible with the first communication protocol while including, in a specified field of the frame headers, a predefined value indicating that the apparatus is capable of communicating in accordance with the second communication protocol. 1. Communication apparatus , comprising:a transceiver configured to transmit and receive signals over a wireless channel in accordance with both a first communication protocol and a second communication protocol, the second communication protocol being backward-compatible with the first communication protocol, the transceiver being configured to provide capabilities that are supported by the second communication protocol but are not supported by the first communication protocol; anda communication controller, which is configured to generate data frames for transmission by the transceiver, the date frames including frame headers that are compatible with the first communication protocol while including, in a specified field of the frame headers, a predefined value indicating that the apparatus is capable of communicating in accordance with the second communication protocol.2. The apparatus according to claim 1 , wherein the communication controller is configured to generate a medium access control (MAC) header of the data frames claim 1 , which includes the specified field as a part of the MAC header.3. The apparatus ...

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Номер записи: 165
21-03-2019 дата публикации

Clear Channel Assessment for Duplex Transmissions in Wireless Local Area Networks

Номер: US20190090278A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A first communication device receives a first packet from a second communication device. The first packet is addressed to the first communication device, and the first packet spans a communication channel. The first communication device and the second communication device belong to a communication network. The first communication device determines whether another communication network is also using the communication channel during the transmission of the first packet. In response to determining that another communication network is not using the communication channel during the transmission of the first packet, the first communication device transmits, in the communication channel, a second packet addressed to the second communication device while the first communication device is receiving the first packet. 1. A method , comprising: the first packet is addressed to the first communication device,', 'the first communication device and the second communication device belong to a communication network, and', 'the first packet spans a communication channel;, 'receiving, at a first communication device, a first packet from a second communication device, whereindetermining, at the first communication device, whether another communication network is also using the communication channel during the transmission of the first packet; andin response to determining that another communication network is not using the communication channel during the transmission of the first packet, transmitting, by the first communication device, a second packet addressed to the second communication device, wherein the second packet is transmitted while the first communication device is receiving the first packet, and wherein the second packet is transmitted in the communication channel.2. The method of claim 1 , wherein determining whether another communication network is also using the communication channel during the transmission of the first packet comprises:determining, at the first ...

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Номер записи: 166
07-04-2016 дата публикации

MEDIUM ACCESS PROTECTION AND BANDWIDTH NEGOTIATION IN A WIRELESS LOCAL AREA NETWORK

Номер: US20160099798A1
Автор: CAO Rui, Chu Liwen, Lou Hui-Ling, Sun Yakun, Zhang Hongyuan, Zheng Xiayu
Принадлежит:

A first communication device transmits a first control frame to multiple second communication devices via a wireless communication medium, wherein the first control frame i) indicates to other communication devices that the wireless communication medium is reserved for a first time period, and ii) indicates that the second communication devices are requested to simultaneously transmit respective second control frames to the first communication device via the wireless communication medium, wherein the second control frames are to include information indicating to other communication devices that the wireless communication medium is reserved for a second time period that is a subset of the first time period. 1. A method , comprising: i) indicates to other communication devices that the wireless communication medium is reserved for a first time period, and', 'ii) indicates that the two or more second communication devices are requested to simultaneously transmit respective second control frames to the first communication device via the wireless communication medium, wherein the second control frames are to include information indicating to other communication devices that the wireless communication medium is reserved for a second time period that is a subset of the first time period;, 'transmitting, with a first communication device acting, a first control frame to two or more second communication devices via a wireless communication medium, wherein the first control frame'}receiving, at the first communication device from at least some of the two or more second communication devices, respective second control frames, the received second control frames having been transmitted by the at least some of the two or more second communication devices via the wireless communication medium, wherein the received second control frames include the information indicating to other communication devices that the wireless communication medium is reserved for the second time period; ...

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Номер записи: 167
01-04-2021 дата публикации

ACKNOWLEDGEMENT OF TRANSMISSIONS IN A WIRELESS LOCAL AREA NETWORK

Номер: US20210099908A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A first communication device receives one or more aggregate medium access control (MAC) data units from respective one or more second communication devices. Respective aggregate MAC data units include multiple MAC data units from respective ones of the one or more second communication devices. The first communication device generates one or more acknowledgement information fields, including a first acknowledgement information field corresponding to a particular second communication device includes i) a length indication that indicates a length of an acknowledgement field, and ii) the acknowledgment field of the indicated length. The acknowledgement field includes respective acknowledgement information for at least some of the multiple MAC data units received from the particular second communication device. The first communication device generates an acknowledgement data unit to include the one or more one or more acknowledgement information fields, and transmits the acknowledgment data unit to the one or more second communication devices. 120-. (canceled)21. A method for acknowledging a data unit , the method comprising:receiving, at a first communication device, one or more aggregate medium access control (MAC) data units from respective one or more second communication devices, respective ones of the one or more aggregate MAC data units including respective sets of multiple MAC data units from respective ones of the one or more second communication devices; (i) a length indication that indicates a length of an acknowledgement field, the length of the acknowledgement field being selected from a subset of predetermined lengths, among a set of predetermined lengths, the subset including multiple predetermined lengths that do not exceed a buffer size determined based on an acknowledgement setup procedure previously conducted between the first communication device and the particular second communication device, and', '(ii) the acknowledgment field of the indicated ...

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Номер записи: 168
14-04-2016 дата публикации

SHORT PACKET FOR USE IN BEAMFORMING

Номер: US20160105260A1
Автор: Liu Yong, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A method for generating a beamforming training (BFT) unit includes generating a physical layer (PHY) preamble of the BFT unit and generating a first encoding block and a second encoding block using PHY data and MAC data, including at least one of i) using a number of padding bits in a PHY layer of the BFT unit such that the BFT unit consists of the PHY preamble, the first encoding block, and the second encoding block, and ii) generating a MAC protocol data unit (MPDU) having a length such that the BFT unit consists of the PHY preamble, the first encoding block, and the second encoding block. 1generating a physical layer (PHY) preamble of the BFT unit; and using a number of padding bits in a PHY layer of the BFT unit such that the BFT unit consists of the PHY preamble, the first encoding block, and the second encoding block; and', 'generating a MAC protocol data unit (MPDU) having a length such that the BFT unit consists of the PHY preamble, the first encoding block, and the second encoding block., 'generating a first encoding block and a second encoding block using PHY data and MAC data, including at least one of. A method for generating a beamforming training (BFT) unit, the method comprising: This application is a continuation of U.S. application Ser. No. 12/876,758, entitled “Short Packet for Use in Beamforming,” filed Sep. 7, 2010, which claims the benefit of U.S. Provisional Patent Application No. 61/243,848, entitled “Tx Sector Sweep for 60 GHz,” filed Sep. 18, 2009. The entire disclosures of both applications above are hereby expressly incorporated herein by reference.The present disclosure relates generally to communication systems and, more particularly, to information formats for exchanging information via communication channels.An ever-increasing number of relatively inexpensive, low power wireless data communication services, networks and devices have been made available over the past number of years, promising near wire speed transmission and ...

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Номер записи: 169
28-03-2019 дата публикации

MEDIA ACCESS CONTROL FOR DUPLEX TRANSMISSIONS IN WIRELESS LOCAL AREA NETWORKS

Номер: US20190098664A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A first communication device receives an indication that a second communication device permits a duplex transmission while the second communication device transmits during a transmit opportunity period (TXOP), where duplex transmissions involve simultaneously transmitting and receiving via a same wireless frequency band. The indication is included in a media access control layer (MAC) protocol data unit (MPDU). In response to receiving the indication that the second communication device permits the duplex transmission, the first communication device determines that the first communication device is permitted to perform the duplex transmission during the TXOP. The first communication device receives a first packet from the second communication device during the TXOP, and transmits a second packet while the first communication device is receiving the first packet. 1. A method implemented by a first communication device that is capable of duplex transmissions , wherein duplex transmissions involve simultaneously transmitting and receiving via a same wireless frequency band , the method comprising:receiving, at the first communication device, an indication that a second communication device permits a duplex transmission while the second communication device transmits during a transmit opportunity period (TXOP) established by the second communication device, wherein the indication is received from the second communication device via a wireless transmission, and wherein the indication is included in a media access control layer (MAC) protocol data unit (MPDU);in response to receiving the indication that the second communication device permits the duplex transmission, determining, at the first communication device, that the first communication device is permitted to perform the duplex transmission during the TXOP;receiving, at the first communication device, a first packet from the second communication device during the TXOP, wherein the first packet spans a wireless ...

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Номер записи: 170
08-04-2021 дата публикации

BLOCK ACKNOWLEDGMENT OPERATION

Номер: US20210105094A1
Автор: Chu Liwen, Ho Ken Kinwah, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A first communication device generates and transmits a first communication frame corresponding to a request to participate in a block acknowledgment procedure. The first communication frame includes: a first field indicating a number of buffers requested to be allocated at a second communication device for buffering data units to be transmitted by the first communication device, and a second field indicating a first maximum bitmap length supported by the first communication device. The first communication device receives a second communication frame corresponding to a response to the first communication frame. The second communication frame includes: a third field indicating a number of buffers allocated at the second communication device for buffering the data units transmitted by the first communication device, and a fourth field indicating a second maximum bitmap length supported by the second communication device. The first communication device performs the block acknowledgment procedure in accordance with the second maximum bitmap length. 1. (canceled)2. A method for transmitting management information in a wireless communication network , comprising:determining, at an access point, that a management frame is to be transmitted to a first client station within a downlink (DL) multi-user (MU) transmission that includes one or more other frames intended for one or more second client stations; i) generating, at the access point, the management frame to include a control field that is configured to prompt the first client station to respond to the management frame with an acknowledgment frame, the control field including a subfield that indicates a set of orthogonal frequency division multiplexing (OFDM) tones that the first client station is to use for transmitting the acknowledgment frame, or', 'ii) generating, at the access point, an aggregate media access control protocol data unit (A-MPDU) having a) the management frame, and b) a trigger frame that is ...

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Номер записи: 171
04-04-2019 дата публикации

Systems and methods for multi-user operation with duplex medium access control

Номер: US20190104513A1
Автор: Hongyuan Zhang, Hui-Ling Lou, Liwen Chu
Принадлежит: MARVELL WORLD TRADE LTD

Embodiments described herein provide a method for establishing multi-user operation with duplex medium access control in a wireless local area network. Specifically, a trigger frame is transmitted to one or more client stations in a wireless local area network. In response to transmitting the trigger frame, one or more uplink data packets are received from the one or more client stations. It is then determined whether the one or more client stations support duplex operation. A downlink data packet configured in a multi-user data format is transmitted to at least one destined client station that supports duplex operation while simultaneously receiving the one or more uplink data packets from the one or more client stations.

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Номер записи: 172
04-04-2019 дата публикации

COEXISTENCE TECHNIQUES FOR WIDE AREA NETWORK DEVICES OPERATING IN UNLICENSED BANDS

Номер: US20190104523A1
Автор: Chu Liwen, Lou Hui-Ling, Sun Yakun, Xu Mingguang, Zhang Hongyuan
Принадлежит:

A communication device associated with a first wireless communication network transmits an indication that a communication channel in an unlicensed frequency band is being utilized by the first wireless communication network. The indication is transmitted to an access point of a second wireless communication network. The first wireless communication network utilizes a first wireless communication protocol developed for use in licensed frequency bands, and the second wireless communication network utilizes a second wireless communication protocol developed for use in the unlicensed frequency band. The indication is transmitted by the communication device to prompt the access point of the second wireless communication network, to determine that i) the communication channel cannot be used by the second wireless communication network, or ii) the second wireless communication network is to temporarily yield the communication channel to the first wireless communication network. 1. (canceled)2. A method , comprising:receiving, at an access point of a first wireless communication network, an indication that a communication channel in an unlicensed frequency band is being utilized by a second wireless communication network, wherein the first wireless communication network utilizes a first wireless communication protocol developed for use in the unlicensed frequency band, wherein the second wireless communication network utilizes a second wireless communication protocol developed for use in frequency bands that are licensed by a government entity for wireless communication applications, and wherein the government entity does not require licenses to use the unlicensed frequency band; andin response to receiving the indication that the communication channel in the unlicensed frequency band is being utilized by the second wireless communication network that utilizes the second wireless communication protocol developed for use in frequency bands that are licensed by the ...

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Номер записи: 173
30-04-2015 дата публикации

RANGE EXTENSION MODE FOR WIFI

Номер: US20150117227A1
Автор: Lou Hui-Ling, Yong Su Khiong, Zhang Hongyuan
Принадлежит:

A method for generating a physical layer (PHY) data unit for transmission via a communication channel is described where the PHY data unit conforms to a first communication protocol. Orthogonal frequency division multiplexing (OFDM) symbols for a data field of the PHY data unit are generated according to a range extension coding scheme that corresponds to a range extension mode of the first communication protocol. A preamble of the PHY data unit is generated, the preamble having i) a first portion that indicates a duration of the PHY data unit and ii) a second portion that indicates whether at least some OFDM symbols of the data field are generated according to the range extension coding scheme. The first portion of the preamble is formatted such that the first portion of the preamble is decodable by a receiver device that conforms to a second communication protocol, but does not conform to the first communication protocol, to determine the duration of the PHY data unit based on the first portion of the preamble. The PHY data unit is generated to include the preamble and the data field. 1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel , the PHY data unit conforming to a first communication protocol , the method comprising:generating orthogonal frequency division multiplexing (OFDM) symbols for a data field of the PHY data unit according to a range extension coding scheme that corresponds to a range extension mode of the first communication protocol;generating a preamble of the PHY data unit, the preamble having i) a first portion that indicates a duration of the PHY data unit and ii) a second portion that indicates whether at least some OFDM symbols of the data field are generated according to the range extension coding scheme, the first portion of the preamble being formatted such that the first portion of the preamble is decodable by a receiver device that conforms to a second communication protocol, but does ...

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Номер записи: 174
19-04-2018 дата публикации

Method and apparatus for performing a fine timing measurement in a wireless network

Номер: US20180109970A1
Автор: Hongyuan Zhang, Hui-Ling Lou, Liwen Chu, Sagar A. Tamhane, Sarang Shrikrishna Wagholikar
Принадлежит: MARVELL WORLD TRADE LTD

A first wireless communication device includes a timing module to provide a timing synchronization function (TSF) time. A fine timing measurement module is to transmit a first request to perform a fine timing measurement to determine a distance between the first wireless communication device and a second wireless communication device. The first request includes a first value of the TSF time at which to start a burst period of the fine timing measurement, and the first value is determined in accordance with the TSF time provided by the timing module. The fine timing measurement module is further to receive a first response as transmitted from the second wireless communication device in response to the first request and transmit a second request to start the burst period at a TSF time indicated by the first value. The first response includes the first value of the TSF time.

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Номер записи: 175
20-04-2017 дата публикации

Acknowledgment Data Unit for Multiple Uplink Data Units

Номер: US20170111951A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Wang Lei, Zhang Hongyuan
Принадлежит:

A method for simultaneously communicating with multiple communication devices in a wireless local area network is described. Multiple uplink data units are received that are simultaneously transmitted by multiple second communication devices. The multiple uplink data units include a management data unit and a traffic data unit. An acknowledgment data unit is generated to acknowledge receipt of the multiple data units. The acknowledgment data unit includes (i) an indication that indicates that the acknowledgment data unit is intended for the multiple second communication devices, and (ii) respective acknowledgment information fields for the multiple second communication devices. The respective acknowledgment information fields include a first acknowledgment information field for the management data unit and a second acknowledgment information field for the traffic data unit. The acknowledgment data unit is caused to be transmitted from the first communication device to the multiple second communication devices. 1. A method for simultaneously communicating with multiple communication devices in a wireless local area network , the method comprising:receiving, at a first communication device, multiple uplink data units simultaneously transmitted by multiple second communication devices, wherein the multiple uplink data units include a management data unit and a traffic data unit;generating, at the first communication device, an acknowledgment data unit to acknowledge receipt of the multiple data units simultaneously transmitted by the multiple second communication devices, wherein the acknowledgment data unit includes (i) an indication that indicates that the acknowledgment data unit is intended for the multiple second communication devices, and (ii) respective acknowledgment information fields for the multiple second communication devices, wherein the respective acknowledgment information fields include a first acknowledgment information field for the management data ...

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Номер записи: 176
02-04-2020 дата публикации

Method and apparatus for uplink orthogonal frequency division multiple access

Номер: US20200106489A1
Автор: Hongyuan Zhang, Hui-Ling Lou, Jinjing Jiang, Lei Wang, Liwen Chu, Yakun Sun
Принадлежит: Marvell International Ltd

A first communication device transmits a trigger frame transmission to multiple second communication devices to prompt the multiple second communication devices to simultaneously transmit in multiple communication sub-channels. The first communication device receives one or more transmissions from one or more of the second communication devices in less than all of the communication sub-channels. The first communication device generates acknowledgment information for the one or more transmissions from the one or more of the second communication devices, and transmits the acknowledgment information via all of communication sub-channels.

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Номер записи: 177
02-04-2020 дата публикации

TRIGGER FRAME FORMAT FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS (OFDMA) COMMUNICATION

Номер: US20200107318A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Sun Yakun, Wang Lei, Zhang Hongyuan
Принадлежит:

Multiple trigger frames are generated at a first communication device to trigger an uplink orthogonal frequency multiple access (OFDMA) transmission by multiple second communication devices. The multiple trigger frames include a broadcast trigger frame that includes information to indicate transmission parameters for a first subset of the second communication devices, and one or more unicast trigger frames, each of the one or more unicast trigger frame including information to indicate transmission parameters for a particular second communication device in a second subset of the second communication devices. The broadcast trigger frame is transmitted, in a first frequency portion of a downlink OFDMA transmission, to the first subset of the second communication devices, and respective unicast trigger frames are transmitted, in respective second frequency portions of the downlink OFDMA transmission, to the second subset of the second communication devices. 1. (canceled)2. A method for communicating in a wireless communication network , the method comprising: generating a first RU allocation subfield in a first per-station information field of the first trigger frame to include an indication of first frequency resources, and', 'generating a first STA-ID subfield in the first per-station information field of the first trigger frame to include a reserved station identifier value that indicates that multiple client stations are permitted to contend for the first frequency resources as part of a contention-based transmission;, 'generating, at an access point, one or more trigger frames to trigger an uplink multi-user (MU) transmission by one or more client stations, wherein each of the one or more trigger frames is generated to include a medium access control (MAC) header portion and a MAC frame body portion, wherein each MAC frame body portion is generated to include one or more per-station information fields that include respective information to indicate respective ...

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Номер записи: 178
02-04-2020 дата публикации

WLAN OPERATION USING MULTIPLE COMPONENT CHANNELS

Номер: US20200107393A1
Автор: Chao Yi-Ling, Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A method for operation of a first communication device in a wireless local area network (WLAN) communication channel, having a plurality of component channels, between the first communication device and a second communication device is described. A first physical layer (PHY) protocol data unit (PPDU) and a second PPDU, distinct from the first PPDU, are generated. The first PPDU and second PPDU are transmitted simultaneously to the second communication device over the WLAN communication channel, including: transmitting the first PPDU via a first component channel within a first radio frequency (RF) channel segment that occupies a first frequency bandwidth, and transmitting the second PPDU via a second component channel within a second RF channel segment that occupies a second frequency bandwidth that does not overlap the first frequency bandwidth segment, and is separated from the first frequency bandwidth segment by a frequency gap. 1. A method for operation of a first communication device in a wireless local area network (WLAN) communication channel between the first communication device and a second communication device , the WLAN communication channel having a plurality of component channels , the method comprising:generating, at the first communication device, a first physical layer (PHY) protocol data unit (PPDU) for transmission to the second communication device;generating, at the first communication device, a second PPDU that is distinct from the first PPDU for transmission to the second communication device; transmitting the first PPDU via a first component channel of the plurality of component channels, the first component channel being within a first radio frequency (RF) channel segment that occupies a first frequency bandwidth, and', 'transmitting the second PPDU via a second component channel of the plurality of component channels, the second component channel being within a second RF channel segment that occupies a second frequency bandwidth that does ...

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Номер записи: 179
07-05-2015 дата публикации

Method and Apparatus for Scheduling use of Radio Resources in a Wireless Network

Номер: US20150124676A1
Автор: Chao Yi-Ling, Lou Hui-Ling, SONG Leilei
Принадлежит:

The present disclosure describes techniques and apparatuses for scheduling use of radio resources in a wireless network. In some aspects a method is described that includes receiving an indication from a mobile device of an in-device coexistence problem, and determining, from the parameters in the received indication, one or more component carriers of the carrier aggregation affected by the in-device coexistence problem. The method also includes applying a time-domain solution and/or a frequency domain solution to at least one of the one or more affected component carriers to solve the in-device coexistence problem. 1. A method for scheduling a plurality of component carriers that are to be aggregated in a carrier aggregation at a network node , the method comprising:receiving, at the network node, an indication from a mobile device of an in-device coexistence problem, the indication comprising parameters related to the in-device coexistence problem;determining, from the parameters in the indication, one or more of the plurality of component carriers of the carrier aggregation that are affected by the in-device coexistence problem;applying a time-domain solution to at least one of the one or more affected component carriers;determining if the time-domain solution resolves the in-device coexistence problem; and determining if any of the one or more component carriers affected by the in-device coexistence problem are associated with a secondary serving cell, and', 'in response to determining that any of the one or more component carriers affected by the in-device coexistence problem are associated with a secondary serving cell, (i) removing the one or more affected component carriers associated with the secondary serving cell from the carrier aggregation, and (ii) adding one or more component carriers from one or more secondary serving cells to the carrier aggregation, wherein the one or more component carriers added from the one or more secondary serving cells are ...

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Номер записи: 180
27-04-2017 дата публикации

Acknowledgment of Uplink Orthogonal Frequency Division Multiple Access Transmission

Номер: US20170118000A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Sun Yakun, Wang Lei, Zhang Hongyuan
Принадлежит:

A first communication device receives an uplink orthogonal frequency multiple access (OFDMA) transmission. The uplink OFDMA transmission includes respective transmissions from multiple second communication devices, and the respective transmissions from the multiple second communication devices include indications of respective acknowledgment policies corresponding to the respective transmissions from the multiple second communication devices. The first communication device generates one or more acknowledgment physical layer (PHY) data units to acknowledge at least a portion of the uplink OFDMA transmission, where the one or more acknowledgment PHY data units do not comply with at least one of the acknowledgment policies corresponding to the uplink OFDMA transmission. The first communication device transmits the one or more acknowledgment PHY data units to acknowledge the at least the portion of the uplink OFDMA transmission. 1. A method for communicating in a wireless communication network , the method comprising:receiving, at the first communication device, an uplink orthogonal frequency multiple access (OFDMA) transmission, wherein the uplink OFDMA transmission includes respective transmissions from the multiple second communication devices, wherein the respective transmissions from the multiple second communication devices include indications of respective acknowledgment policies corresponding to the respective transmissions from the multiple second communication devices;generating, at the first communication device, one or more acknowledgment physical layer (PHY) data units to acknowledge at least a portion of the uplink OFDMA transmission, wherein the one or more acknowledgment PHY data units do not comply with at least one of the acknowledgment policies corresponding to the uplink OFDMA transmission; andtransmitting, with the first communication device, the one or more acknowledgment PHY data units to acknowledge the at least the portion of the uplink OFDMA ...

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Номер записи: 181
27-04-2017 дата публикации

STRUCTURE FOR LOW-POWER-LOW-RATE DATA TRANSMISSION

Номер: US20170118315A1
Автор: Lou Hui-Ling, Sun Yakun, Wang Lei, Zhang Hongyuan
Принадлежит:

Embodiments described herein provides a system for detecting data received in a low power low rate (LPLR) data frame format. The system includes a receiver and control circuitry. The receiver is configured to receive a data frame comprising an LPLR preamble portion and an LPLR data portion following the LPLR preamble portion. The LPLR preamble portion and the LPLR data portion occupy a bandwidth that is less than an allowed bandwidth. The control circuitry is configured to determine a mode of the data frame based on whether the data frame has an additional portion, and detect a data field in the LPLR preamble portion from the data frame based on the mode of the data frame. 1. A system for detecting data received in a low power low rate (LPLR) data frame format , comprising: 'wherein the LPLR preamble portion and the LPLR data portion occupy a bandwidth that is less than an allowed bandwidth; and', 'a receiver configured to receive a data frame comprising an LPLR preamble portion and an LPLR data portion following the LPLR preamble portion,'}control circuitry configured to determine a mode of the data frame based on whether the data frame has an additional portion, and detect a data field in the LPLR preamble portion from the data frame based on the mode of the data frame.2. The system of claim 1 , wherein the allowed bandwidth is 20 MHz and the LPLR data frame format is transmitted at a frequency above 1 GHz.3. The system of claim 1 , wherein the data format further comprises a legacy preamble portion that precedes the LPLR preamble portion and occupies the allowed bandwidth.4. The system of claim 1 , wherein the modes includes any of a mixed mode or a single mode claim 1 , and wherein the mixed mode includes a legacy preamble portion that precedes the LPLR preamble portion and occupies the allowed bandwidth claim 1 , and the single mode includes only the LPLR preamble portion and the LPLR data portion.5. The system of claim 1 , wherein the LPLR preamble portion and ...

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Номер записи: 182
27-04-2017 дата публикации

BACKOFF OPERATION IN CONNECTION WITH SPATIAL REUSE

Номер: US20170118725A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Sun Yakun, Wang Lei, Zhang Hongyuan
Принадлежит:

A communication device receives a signal during a backoff period of a backoff procedure, wherein the communication device is part of a first communication network. In response to determining that i) the signal is valid, ii) the signal is from another communication network, and iii) the power level of the signal does not meet a threshold that is higher than a default threshold, the communication device continues a count of a backoff timer during reception of the signal. In connection with comparing the power level of the signal to the threshold higher than the default threshold, the communication device sets a transmit power level to a reduced power level that is lower than a default power level. The communication device transmits at a transmit power level that is less than or equal to the reduced transmit power level in response to the backoff timer expiring. 1. A method , comprising:receiving, at a communication device, a signal during a backoff period of a backoff procedure, wherein the communication device is part of a first communication network; determining, at the communication device, whether i) the signal is valid, ii) the signal is from another communication network, and iii) a power level of the signal meets a threshold that a) is higher than a default threshold for the backoff procedure, and b) is for analyzing valid signals not from the first communication network,', 'in response to determining that i) the signal is valid, ii) the signal is from another communication network, and iii) the power level of the signal does not meet the threshold, continuing a count of a backoff timer, at the communication device, during reception of the signal, the backoff timer for measuring a backoff time period, and', 'in connection with comparing the power level of the signal to the threshold that is higher than the default threshold, setting, at the communication device, a transmit power level to be used when the communication device transmits responsive to the backoff ...

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Номер записи: 183
13-05-2021 дата публикации

APPARATUS AND METHOD FOR MULTI-LINK COMMUNICATIONS

Номер: US20210144787A1
Автор: Chu Liwen, Kwon Young Hoon, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

Embodiments of an apparatus and method are disclosed. In an embodiment, a method of multi-link communications involves at an access point (AP) multi-link device, allocating Association IDs (AIDs) to non-AP multi-link devices, including allocating one of the AIDs to each of the non-AP multi-link devices, and at the AP multi-link device, generating a first indication element for the AIDs to indicate a buffered data configuration at the AP multi-link device for the non-AP multi-link devices. 1. A method of multi-link communications , the method comprising:at an access point (AP) multi-link device, allocating a plurality of Association IDs (AIDs) to a plurality of non-AP multi-link devices, comprising allocating one of the AIDs to each of the non-AP multi-link devices; andat the AP multi-link device, generating a first indication element for the AIDs to indicate a buffered data configuration at the AP multi-link device for the non-AP multi-link devices.2. The method of claim 1 , further comprising:at the AP multi-link device, generating a second indication element to indicate communications link information associated with the buffered data configuration at the AP multi-link device.3. The method of claim 2 , wherein at the AP multi-link device claim 2 , generating the second indication element to indicate the communications link information associated with the buffered data configuration at the AP multi-link device comprises:at the AP multi-link device, generating a link mapping bitmap (LMB) for each of the AIDs whose corresponding non-AP multi-link device the AP multi-link device has a buffered data unit to be delivered to, wherein the LMB indicates a set of designated communications links through which the buffered data unit is to be delivered.4. The method of claim 3 , wherein the buffered data unit is an individually addressed buffered data unit.5. The method of claim 2 , further comprising from the AP multi-link device claim 2 , transmitting the first indication ...

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Номер записи: 184
24-07-2014 дата публикации

BEAMFORMING BY SECTOR SWEEPING

Номер: US20140206304A1
Автор: Liu Yong, Lou Hui-Ling, Shen Manyuan, Wu Songping, Zhang Hongyuan
Принадлежит: MARVELL WORLD TRADE LTD.

A first plurality of training data units are transmitted via a plurality of antennas of a first station as part of a first transmit beamforming training procedure. Subsequently, a second plurality of training data units are received via the plurality of antennas as part of second transmit beamforming procedure while the first station applies a single receive antenna configuration. The second plurality of training data units includes an information element that specifies a feedback from a second station, the feedback including an identifier corresponding to one of the training data units in the first plurality of data units. The first station transmits a feedback message to the second station, that includes (i) one or more indicators of one or more training data units selected from the second plurality of training data units, and (ii) a request to perform a subsequent beamforming training procedure. 1. A method for beamforming in a communication system , the method comprising: the first plurality of training data units are transmitted while the second station operates the second plurality of antennas in an omni receive pattern mode, and', 'each training data unit in the first plurality of training data units includes a corresponding first identifier;, 'transmitting, with a first station, a first plurality of training data units via a first plurality of antennas to a second station having a second plurality of antennas, wherein'}applying, at the first station, a different transmit steering vector as each training data unit in the first plurality of training data units is transmitted;after transmitting the first plurality of training data units, receiving, at the first station, a second plurality of training data units via the first plurality of antennas, the second plurality of training data units having been transmitted by the second station while the second station applies a different transmit steering vector to the second plurality of antennas as each training unit ...

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Номер записи: 185
14-05-2015 дата публикации

Medium Access Control for Multi-Channel OFDM in a Wireless Local Area Network

Номер: US20150131517A1
Автор: Chu Liwen, Lou Hui-Ling, Sun Yakun, Zhang Hongyuan
Принадлежит:

A first communication device allocates respective sub-channels of an orthogonal frequency division multiplexing (OFDM) channel to two or more second communication devices for uplink orthogonal frequency division multiple access (OFDMA) transmission from the two or more second communication devices. A first sub-channel is allocated to a first one of the second communication devices and a second sub-channel is allocated to a second one of the second communication devices. The first communication device provides, to the second communication devices, indications of the respective sub-channels allocated to the second communication devices. The first communication device receives an uplink OFDMA data unit that includes a first OFDM data unit transmitted from the first one of the second communication devices via the first sub-channel, and a second OFDM data unit transmitted from the second one of the second communication devices via the second sub-channel. 1. A method for simultaneously communication with multiple communication devices in a wireless local area network , the method comprising:allocating, by a first communication device, respective sub-channels of an orthogonal frequency division multiplexing (OFDM) channel to two or more second communication devices for uplink orthogonal frequency division multiple access (OFDMA) transmission from the two or more second communication devices, including allocating a first sub-channel to a first one of the two or more second communication devices and a second sub-channel to a second one of the two or more second communication devices;providing, from the first communication device to the two or more second communication devices, indications of the respective sub-channels allocated for uplink OFDMA transmission from the two or more second communication devices; andreceiving, at the first communication device, an uplink OFDMA data unit that includes at least a first OFDM data unit from the first one of the two or more second ...

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Номер записи: 186
14-05-2015 дата публикации

METHOD AND APPARATUS FOR SYNCHRONIZING TIMING AMONG DEVICES IN A WIRELESS LOCAL AREA NETWORK (WLAN)

Номер: US20150131628A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A wireless communication device including a first media access control device and a first transceiver. The first media access control device is configured to selectively generate a first timestamp having a first length and a second timestamp having a second length. The first timestamp indicates a first synchronization time of the wireless communication device, the second timestamp indicates only a first portion of the first synchronization time, and the first synchronization time is used by a client station to synchronize timing between the wireless communication device and the client station. The first media access control device is further configured to generate a beacon including either the first timestamp or the second timestamp, and an indication of whether the beacon includes the first timestamp or the second timestamp. The first transceiver is configured to transmit the beacon from the wireless communication device to the client station. 1. A wireless communication device , comprising: selectively generate (i) a first timestamp having a first length, and (ii) a second timestamp having a second length, wherein the first timestamp indicates a first synchronization time of the wireless communication device, wherein the second timestamp indicates only a first portion of the first synchronization time, and wherein the first synchronization time is used by a client station to synchronize timing between the wireless communication device and the client station, and', 'generate a beacon including (i) either the first timestamp or the second timestamp, and (ii) an indication of whether the beacon includes the first timestamp or the second timestamp, wherein the indication of whether the beacon includes the first timestamp or the second timestamp corresponds to a timestamp indication bit in a frame control field of the beacon; and, 'a first media access control device configured to'}a first transceiver configured to transmit the beacon from the wireless communication ...

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Номер записи: 187
31-07-2014 дата публикации

IN-DEVICE COEXISTENCE OF MULTIPLE WIRELESS COMMUNICATION TECHNOLOGIES

Номер: US20140211766A1
Автор: Lou Hui-Ling, SONG Leilei, Zhao Qing
Принадлежит: MARVELL WORLD TRADE LTD.

In a method of operating a device configured to communicate according to at least a first communication protocol and a second communication protocol, a time division multiplexing (TDM) pattern is obtained. The TDM pattern is defined for communication according to the first communication protocol is obtained. The TDM pattern defines communication periodicity that includes a scheduled period and an unscheduled period. A guard interval is reserved within the unscheduled period, and the unscheduled period is used for communication according to the second communication protocol. The guard interval is used to transition to an inactive state with respect to the second communication protocol. 1. A method of operating a device configured to communicate according to at least a first communication protocol and a second communication protocol , the method comprising:obtaining a time division multiplexing (TDM) pattern defined for communication according to the first communication protocol, wherein the TDM pattern defines communication periodicity that includes a scheduled period and an unscheduled period;reserving a guard interval within the unscheduled period;using the unscheduled period for communication according to the second communication protocol, including using the guard interval to transition to an inactive state with respect to the second communication protocol.2. The method of claim 1 , wherein reserving the guard interval includes determining a duration of the guard interval.3. The method of claim 2 , wherein determining the duration of the guard interval comprises determining the duration based on one or both of (i) a data rate of communications between the communication device and at least one other communication device and (ii) a mode of operation of the communication device.4. The method of claim 3 , wherein determining the duration based on the mode of operation of the communication device comprises determining the duration based on whether the communication ...

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Номер записи: 188
12-05-2016 дата публикации

Acknowledgment for Multiple User Communication in a WLAN

Номер: US20160134406A1
Автор: Hongyuan Zhang, Hui-Ling Lou, Jinjing Jiang, Lei Wang, Liwen Chu
Принадлежит: Marvell Semiconductor Inc, MARVELL WORLD TRADE LTD

A first communication device generates a multi-user (MU) physical layer (PHY) data unit having independent data for multiple second communication devices. The first communication device also generates respective control frames to prompt second communication devices to transmit an orthogonal frequency division multiple access (OFDMA) PHY data unit to acknowledge that the second communication devices received the MU PHY data unit. The MU PHY data unit and the respective control frames are transmitted to the multiple second communication devices. The first communication device receives the OFDMA PHY data unit from at least some of the second communication devices. The first communication device processes the OFDMA PHY data unit to determine whether the multiple second communication devices received the MU PHY data unit.

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Номер записи: 189
01-09-2022 дата публикации

GROUP ACKNOWLEDGEMENT FOR MULTIPLE USER COMMUNICATION IN A WIRELESS LOCAL AREA NETWORK

Номер: US20220278716A1
Автор: Chu Liwen, JIANG Jinjing, Lou Hui-Ling, Wang Lei, Zhang Hongyuan
Принадлежит:

In a method for simultaneously communicating with multiple communication devices in a wireless local area network a first communication device receives a plurality of uplink a data units simultaneously transmitted by multiple second communication devices. The first communication device generates an acknowledgement data unit to acknowledge receipt of the multiple data units simultaneously transmitted by multiple second communication devices. The acknowledgement data unit includes (i) an indication that indicates that the acknowledgement data unit is intended for multiple second communication devices and (ii) respective acknowledgement information for the multiple second communication devices. The acknowledgement data unit is transmitted from the first communication device to the multiple second communication devices. 128-. (canceled)29. A method for simultaneously communicating with multiple communication devices in a wireless local area network , the method comprising:receiving, at a first communication device, a plurality of uplink data units simultaneously transmitted by multiple second communication devices of a multi-user multiple input multiple output (MU-MIMO) group or of an orthogonal frequency division multiple access (OFDMA) group;generating, at the first communication device, an acknowledgement data unit to acknowledge receipt of the multiple data units simultaneously transmitted by multiple second communication devices, wherein the acknowledgement data unit includes (i) an indication that indicates that the acknowledgement data unit is intended for multiple second communication devices and (ii) respective acknowledgement information for the multiple second communication devices;wherein the acknowledgement data unit includes a control field that includes a frame control field a duration/id field, a receiver address field, a transmitter address field, a BA control field, a BA/Ack information field, and a frame sequence check field.30. The method of wherein ...

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Номер записи: 190
28-05-2015 дата публикации

ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS FOR WIRELESS LOCAL AREA NETWORK

Номер: US20150146653A1
Автор: Chu Liwen, Lou Hui-Ling, Sun Yakun, Zhang Hongyuan
Принадлежит:

A method for generating an orthogonal frequency division multiple access (OFDMA) data unit is described. A plurality of different orthogonal frequency division multiplex (OFDM) tone blocks for a wireless local area network (WLAN) communication channel are assigned to a plurality of devices including a first device and second device. The plurality of different OFDM tone blocks includes at least a first OFDM tone block assigned to the first device and a second OFDM tone block assigned to the second device. The first OFDM tone block and the second OFDM tone block together span a bandwidth equal to a smallest channel bandwidth of a legacy WLAN communication protocol. An OFDMA data unit is generated for the WLAN communication channel. The OFDMA unit includes a preamble portion and a data portion. The preamble portion has i) at least a legacy portion that spans the entire WLAN communication channel, ii) a first non-legacy portion that spans the first OFDM tone block, and iii) a second non-legacy portion that spans the second OFDM tone block. 1. A method , comprising: the plurality of different OFDM tone blocks includes at least a first OFDM tone block assigned to the first device and a second OFDM tone block assigned to the second device, and', 'the first OFDM tone block and the second OFDM tone block together span a bandwidth equal to a smallest channel bandwidth of a legacy WLAN communication protocol; and, 'assigning a plurality of different orthogonal frequency division multiplex (OFDM) tone blocks for a wireless local area network (WLAN) communication channel to a plurality of devices including a first device and second device, wherein'}generating an orthogonal frequency division multiple access (OFDMA) data unit for the WLAN communication channel, the OFDMA unit including a preamble portion and a data portion, the preamble portion having i) at least a legacy portion that spans the entire WLAN communication channel, ii) a first non-legacy portion that spans the first ...

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Номер записи: 191
28-05-2015 дата публикации

UPLINK MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT FOR WIRELESS LOCAL AREA NETWORK

Номер: US20150146654A1
Автор: Chu Liwen, Lou Hui-Ling, Zhang Hongyuan
Принадлежит:

A method for selecting members of a client uplink group is described. An uplink traffic characteristic information signal is received from each of a plurality of communication devices. Multiple communication devices of the plurality of communication devices are selected as members of a client uplink group based at least on traffic information indicated by the respective uplink traffic characteristic information signals. An uplink group definition frame is transmitted to each member of the client uplink group. The uplink group definition frame indicates an uplink multi-user multiple input multiple output (MU-MIMO) transmission schedule for the client uplink group for members of the client uplink group to simultaneously transmit to an access point. The members of the client uplink group are triggered to transmit uplink data frames simultaneously. 1. A method comprising:receiving an uplink traffic characteristic information signal from each of a plurality of communication devices;selecting multiple communication devices of the plurality of communication devices as members of a client uplink group based at least on traffic information indicated by the respective uplink traffic characteristic information signals;transmitting an uplink group definition frame to each member of the client uplink group, the uplink group definition frame indicating an uplink multi-user multiple input multiple output (MU-MIMO) transmission schedule for the client uplink group for members of the client uplink group to simultaneously transmit to an access point; andtriggering the members of the client uplink group to transmit uplink data frames simultaneously.2. The method of claim 1 , wherein the uplink group definition frame includes at least one of i) station identifiers (AIDs) of the members of the client uplink group claim 1 , ii) a start time of the uplink MU-MIMO transmission schedule claim 1 , iii) a duration of the uplink MU-MIMO transmission schedule claim 1 , or iv) an interval ...

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Номер записи: 192
28-05-2015 дата публикации

COEXISTENCE TECHNIQUES FOR WIDE AREA NETWORK DEVICES OPERATING IN UNLICENSED BANDS

Номер: US20150146656A1
Автор: Chu Liwen, Lou Hui-Ling, Sun Yakun, Xu Mingguang, Zhang Hongyuan
Принадлежит:

A communication device is configured to operate in a first wireless communication network that utilizes a communication protocol developed for use in frequency bands that are licensed by a government entity for wireless communication applications. The communication device determines whether one or more communication channels in an unlicensed frequency band are not being utilized by any second wireless communication networks, wherein the government entity does not require licenses to use the unlicensed frequency band. In response to determining that one or more communication channels in the unlicensed frequency band are not being utilized by any second wireless communication networks, the communication device selects a set of one or more communication channels in the one or more communication channels for use by the first wireless communication network, and utilizes the set of one or more communication channels for communications in the first wireless communication network. 1. A method implemented by a communication device that is configured to operate in a first wireless communication network that utilizes a communication protocol developed for use in frequency bands that are licensed by a government entity for wireless communication applications , the method comprising:determining, at the communication device, whether one or more communication channels in an unlicensed frequency band are not being utilized by any second wireless communication networks, wherein the government entity does not require licenses to use the unlicensed frequency band;in response to determining that one or more communication channels in the unlicensed frequency band are not being utilized by any second wireless communication networks, selecting, at the communication device, a set of one or more communication channels in the one or more communication channels for use by the first wireless communication network; andutilizing, at the communication device, the set of one or more communication ...

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Номер записи: 193