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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 32230. Отображено 100.

05-01-2012 дата публикации

Signal Encoding Method and Device, Method for Encoding Joint Feedback Signal

Номер: US20120002658A1

Автор: Jing Li, Shuju Fan, Xueli Ma, Zongjie Wang

Принадлежит: Huawei Technologies Co Ltd

A signal encoding method and device and a method for encoding a joint feedback signal are provided. The signal encoding method includes the following steps. When two carriers are configured with multiple-input and multiple-output (MIMO), Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) signals of the two carriers are combined into a joint feedback signal. The joint feedback signal is mapped into a codeword according to a predetermined mapping relationship between signals and codewords. Therefore, through the method for combining and encoding feedback signals of two carriers for transmission on a code channel in a dual cell (DC)-MIMO mode, bit error ratio (BER) and detection error cost are decreased, power overhead is saved, and a cubic metric (CM) value of the system is not affected, thereby enhancing the performance of the system.

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Номер записи: 1

12-01-2012 дата публикации

Method and communication device for feeding back and receiving pre-coding control indication information

Номер: US20120008609A1

Автор: BO Yang, Chongyang Han, Jing Li, Xueli Ma, Zongjie Wang

Принадлежит: Huawei Technologies Co Ltd

The present invention relates to the field of wireless network communications, and provides a method and a device for receiving and sending Pre-coding Control Indication (PCI) information in uplink Multiple-Input Multiple Output (MIMO) transmission or uplink Closed Loop Transmit Diversity (CLTD) transmission, so as to solve a problem that the uplink MIMO communication from a terminal to a Base Station (BS) is unable to be realized in the prior art. A BS transmitting method includes carrying a code sequence, which represents PCI information, in a feedback channel of a BS. The beneficial effect of the present invention is: by feeding back the PCI information, the terminal realizes the maximization of a block length supported by an existing channel condition after the uplink MIMO is introduced, so as to improve an uplink transmission rate.

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Номер записи: 2

19-01-2012 дата публикации

Wireless transmission apparatus and precoding method

Номер: US20120014279A1

Автор: Daichi Imamura, Fumiyuki Adachi, Kenichi Miyoshi, Megumi Ichikawa, Seigo Nakao, Shinsuke Takaoka, Yoshiko Saito

Принадлежит: Panasonic Corp

A wireless transmission apparatus able to reliably increase outage capacity according to the state of a propagation path. This apparatus is a wireless transmission apparatus ( 100 ) which transmits a plurality of streams to a wireless reception apparatus; wherein a time/space allocation determining unit ( 107 ) determines the spatial multiplex stream number based on the desired multipath number and the number of reception antenna ports of the wireless reception apparatus, said desired multipath number being calculated based on the detected multipath number, the number of reception antenna ports, and the desired error rate for the plurality of streams; a stream dividing unit ( 109 ) divides the transmission data into a plurality of streams of that spatial multiplex stream number; a transmission weight calculation unit ( 108 ) calculates a transmission weight based on the desired multipath number, spatial multiplex stream number, and a channel estimation value; and a time precoding unit ( 1103 ) and a spatial precoding unit ( 111 ) use the transmission weight to precode the plurality of streams.

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Номер записи: 3

19-01-2012 дата публикации

Wireless communication system, device and method

Номер: US20120014469A1

Автор: Liang Zhou

Принадлежит: Fujitsu Ltd

A wireless communication system includes an inverse matrix calculating unit which uses an inverse matrix of a channel matrix of a first combination of L antennas (where L is an integer, 1≦L≦N) selected from the N antennas, so as to calculate an inverse matrix of a channel matrix of a second combination of L antennas selected from the N antennas through an arithmetic operation, and an antenna selecting unit which selects a combination of L antennas from the N antennas as L antennas to be used for communication, the selected combination determining a reference value for antenna selection related to the inverse matrix calculated by the inverse matrix calculating unit so that the reference value for antenna selection fits a successive interference cancellation process carried out for a signal transmitted from the L antennas of the selected combination.

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Номер записи: 4

19-01-2012 дата публикации

Method and apparatus for transmitting reference signal in multi-antenna system

Номер: US20120014477A1

Автор: Bin Chul Ihm, Hyun Soo Ko, Ja Ho KOO, Jae Hoon Chung, Moon II Lee, Seung Hee Han

Принадлежит: LG ELECTRONICS INC

A method for transmitting a reference signal in a multi-antenna system is provided. The method includes: selecting at least one orthogonal frequency division multiplexing (OFDM) symbol in a subframe containing a plurality of OFDM symbols; allocating a channel quality indication reference signal (CQI RS) capable of measuring a channel state for each of a plurality of antennas to the selected at least one OFDM symbol; and transmitting the CQI RS, wherein the CQI RS is allocated to an OFDM symbol which does not overlap with an OFDM symbol to which a common reference signal to be transmitted to all user equipments in a cell or a dedicated reference signal to be transmitted to a specific user equipment in the cell is allocated.

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Номер записи: 5

26-01-2012 дата публикации

Systems and methods for pucch feedback in 3gpp wireless networks

Номер: US20120020288A1

Автор: Jianzhong Zhang, Lingjia Liu, Young-Han Nam

Принадлежит: SAMSUNG ELECTRONICS CO LTD

A mobile station for use in a wireless network. The mobile station transmits feedback values in a physical uplink control channel (PUCCH) to a base station of the wireless network. The mobile station is operable to transmit to the base station a subband second precoder matrix index (PMI) associated with a particular subband and a subband channel quality indicator (CQI) value associated with the particular subband together in a subframe of the PUCCH.

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Номер записи: 6

26-01-2012 дата публикации

Transmission using common and dedicated pilots

Номер: US20120020434A1

Автор: Aaron Callard, Dong-Sheng Yu, Jianglei Ma, Mohammadhadi Baligh

Принадлежит: ROCKSTAR BIDCO LP

A method, system, base station and wireless terminal are provided for transmission of a set of mixed pilots that includes both common and dedicated pilots. The method includes selecting a number D of dedicated pilots having regard to performance of the communication link, D≧0, selecting a first pre-coder for pre-coding D dedicated pilots based on some criteria, performing a first pre-coding of the D dedicated pilots with the first pre-coder to produce a set of pre-coded dedicated pilots, performing a second pre-coding of the set of pre-coded dedicated pilots and a set of common pilots to produce a set of mixed pilots, and transmitting data from the transmitter on the communication link with the set of mixed pilots.

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Номер записи: 7

02-02-2012 дата публикации

Method and apparatus for reporting channel state information of multi-channel in wireless local area network system

Номер: US20120026909A1

Автор: Yong Ho Seok

Принадлежит: LG ELECTRONICS INC

A method for reporting channel state information (CSI), performed by a beamformee, in a wireless local area network system using multi-channels is provided. The method includes receiving, from a beamformer, an NDP announcement (NDPA) frame announcing that a null data packet (NDP) frame follows the NDPA frame, receiving the NDP frame from the beamformer, estimating a channel from a training symbol of the NDP frame and transmitting to the beamformer a CSI report frame containing a result obtained by estimating the channel, wherein the channel is a multi-channel acquired by aggregating first and second channels which are non-contiguous to each other, and wherein the CSI report frame includes an average signal to noise ratio (SNR) for each space-time stream of the first channel and a steering matrix for each subcarrier of the first channel and an average SNR for each space-time stream of the second channel and a steering matrix for each subcarrier of the second channel.

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Номер записи: 8

09-02-2012 дата публикации

Allocating a control channel for carrier aggregation

Номер: US20120034945A1

Автор: PING Wang

Принадлежит: Intel Corp

Methods for allocating a physical downlink control channel (PDCCH) to reduce a number of PDCCH candidates in a search space for carrier aggregation on a user equipment (UE) are disclosed. The method comprises the step of selecting a control channel element (CCE) aggregation level for a PDCCH allocation for each of a plurality of user equipments (UEs) at an evolved NodeB (eNB). The operation of identifying a transmission mode for each of a plurality of component carriers (CCs) associated with the PDCCH at the eNB follows. The next operation of the method is assigning each CC's downlink control information (DCI) into CCEs in a PDCCH search space in the PDCCH starting at a CCE location based on the CC's transmission mode and the CCE aggregation level for the UE receiving the CC.

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Номер записи: 9

16-02-2012 дата публикации

Ack/nack transmission for multi-carrier operation

Номер: US20120039279A1

Автор: Aleksandar Damnjanovic, Jelena M. Damnjanovic, Juan Montojo, Peter Gaal, Tao Luo, Wanshi Chen, Xiaoxia Zhang, Xiliang Luo

Принадлежит: Qualcomm Inc

Techniques for acknowledging data transmissions in a multi-carrier wireless communication network are disclosed. In some aspects, a user equipment (UE) receives a data transmission on at least one component carrier (CC) in a plurality of configured CCs. The UE determines acknowledgement/negative acknowledgement (ACK/NACK) information for the data transmission and determines an uplink channel for sending the ACK/NACK information. When the ACK/NACK information is sent on a PUCCH, the UE may perform power control based on which CCs in the plurality of configured CCs data is received. When the ACK/NACK information is sent on a PUSCH, the UE may determine a number of resource elements based on its CC configuration.

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Номер записи: 10

16-02-2012 дата публикации

Ack/nack transmission for multi-carrier operation with downlink assignment index

Номер: US20120039280A1

Автор: Aleksandar Damnjanovic, Jelena M. Damnjanovic, Juan Montojo, Peter Gaal, Tao Luo, Wanshi Chen, Xiaoxia Zhang, Xiliang Luo

Принадлежит: Qualcomm Inc

Techniques for acknowledging data transmissions in a multi-carrier wireless communication network are disclosed. In one aspect, a UE determines a number of acknowledgement/negative acknowledgement (ACK/NACK) bits for a data transmission on one more component carriers (CCs) based on information obtained from a grant. The grant may be a downlink grant or an uplink grant, and the information obtained may include a number of CCs scheduled for data transmission and/or identifiers of the scheduled CCs. The UE may determine the number of ACK/NACK bits for acknowledging the data transmission based on the number of scheduled CCs and the identifier of each scheduled CC.

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Номер записи: 11

16-02-2012 дата публикации

Enforcing constant modulus and finite alphabet properties in adaptive and dual-stage codebooks

Номер: US20120039412A1

Автор: Juan Montojo, Peter Gaal, Stefan Geirhofer

Принадлежит: Qualcomm Inc

Methods and apparatus for enforcing codebook properties (e.g., constant modulus and/or finite alphabet) in adaptive and dual-stage codebooks are described. One example method generally includes receiving multiple feedback aspects of a channel for wireless communications determining multiple codewords based on the multiple feedback aspects, determining a final precoding matrix based on the multiple codewords, enforcing at least one codebook property in at least one of the multiple codewords or the final precoding matrix, applying the final precoding matrix to a plurality of spatial streams to form precoded spatial streams, and transmitting the precoded spatial streams. For certain aspects, enforcing the at least one codebook property includes quantizing elements in each of the multiple codewords and/or the final precoding matrix to the nearest value in a finite alphabet or to increase a performance metric.

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Номер записи: 12

23-02-2012 дата публикации

Method and apparatus for transmitting a frame in a wireless ran system

Номер: US20120044925A1

Автор: Bong Hoe Kim, Byeong Woo Kang, Dae Won Lee, Yong Ho Seok, Yu Jin Noh

Принадлежит: LG ELECTRONICS INC

There is provided a method and apparatus for transmitting a frame which is performed by a transmission STA in a WLAN system. The method of transmitting a frame according to the present invention includes generating an MAC Protocol Data Unit (MPDU) to be transmitted to a target station, generating a PLCP Protocol Data Unit (PPDU) by attaching a Physical Layer Convergence Procedure (PLCP) header to the MPDU, and transmitting the PPDU to the target station. The PLCP header comprises a partial Association ID (AID) of the target station.

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Номер записи: 13

01-03-2012 дата публикации

Precoding with reduced feedback for coordinated multipoint transmission on the downlink

Номер: US20120051450A1

Автор: Kambiz Zangi

Принадлежит: Individual

Techniques for reducing the number of bits needed to specify the best precoding vector for each mobile station in a wireless communication network that employs multi-point transmission are disclosed. An exemplary method begins with the estimation of path loss between a mobile station and each of a plurality of geographically separated transmitter sites, each transmitter site having at least one transmitter antenna. Based on the estimated path losses, one of a plurality of pre-determined subsets (codebooks) of a pre-determined set of antenna precoding vectors is selected. A group index identifying the selected subset is then transmitted to the mobile station. Subsequently, a vector index is received from the mobile station, the vector index corresponding to a precoding vector in the selected subset, and data is transmitted to the mobile station, using the precoding vector applied to the transmitter antennas at the plurality of transmitter sites.

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Номер записи: 14

01-03-2012 дата публикации

Apparatus for Transmitting and Receiving Data to Provide High-Speed Data Communication and Method Thereof

Номер: US20120051474A1

Автор: Deuk-Su Lyu, Eun-Young Choi, Hee-Jung Yu, Myung-Soon Kim, Sok-Kyu Lee, Taehyun Jeon

Принадлежит: Electronics and Telecommunications Research Institute ETRI

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

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Номер записи: 15

08-03-2012 дата публикации

method of pre-equalizing a data signal by time reversal in fdd

Номер: US20120057510A1

Автор: Dinh Thuy Phan Huy, Jean-Marie Chaufray

Принадлежит: France Telecom SA

Pre-equalizing a data signal transmitted in frequency division duplex by an originating entity having a set of originating antennas to a destination entity having a set of destination antennas, including: transmitting a first pilot by a destination antenna; the originating entity estimating a first impulse response of a first channel; an iterative step including an originating antenna transmitting a second pilot modulated by the first impulse response; the destination entity estimating and time reversing a combined impulse response of the first and second channels; the destination antenna transmitting a third pilot modulated by the time-reversed response; estimating a composite response of the channels; re-iterating the iterative step for some originating antennas; and re-iterating the steps of transmitting a first pilot, estimating the first response, and the iterative step for some destination antennas; and determining pre-equalization coefficients for the data signal from a combination of a set of composite impulse responses.

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Номер записи: 16

15-03-2012 дата публикации

Configuring component carriers in carrier aggregation

Номер: US20120063357A1

Автор: Kamran Etemad

Принадлежит: Intel Corp

Technology for configuring component carriers in carrier aggregation is disclosed. One method comprises scanning for an enhanced Node B (eNode B) with a user equipment (UE). An eNode B is selected by the UE. The UE is attached to an available carrier provided by the eNode B. The available carrier is designated as a Primary Component Carrier (PCC). The PCC is configured as a component carrier pair comprising a downlink primary component carrier (DL PCC) and an uplink primary component carrier (UL PCC). Mobility management and security input information is received at the UE from the eNode B via the DL PCC and the UL PCC.

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Номер записи: 17

22-03-2012 дата публикации

Codebook generating method and apparatus for generating a codebook for multi-polarized multiple-input multiple-output (mimo) systems

Номер: US20120069919A1

Автор: BRUNO Clerckx, Goo Chul Chung, Yongxing Zhou

Принадлежит: SAMSUNG ELECTRONICS CO LTD

A method of generating a codebook for a multiple-input multiple-output (MIMO) system is provided. The codebook generation method includes: assigning a single-polarized precoding matrix to diagonal blocks among a plurality of blocks arranged in a block diagonal format in which a number of diagonal blocks corresponds to a number of polarization directions of transmitting antennas; and assigning a zero matrix to remaining blocks excluding the diagonal blocks.

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Номер записи: 18

22-03-2012 дата публикации

Method and apparatus for feedback in closed loop transmitting

Номер: US20120069925A1

Автор: Bishwarup Mondal, Robert M. Harrison, Timothy A. Thomas

Принадлежит: MOTOROLA MOBILITY LLC

A method an apparatus is described for providing feedback for closed-loop transmitting with multiple transmit and receive antennas. The method includes a first step 900 of providing a codebook containing sets of weightings for each data stream of the multiple transmit antennas with each set identified by an index known to a transmitter and a receiver. The same codebook is utilized for any number of data streams up to the number of transmit antennas. A next step 902 includes measuring a composite channel between the transmitter and receiver. A next step 904 includes determining at least one performance metric for each set of weightings in the codebook. A next step 906 includes selecting preferred weightings for each data stream in response to the performance metrics. A next step 908 includes feeding back an index of the preferred weightings to the transmitter for use in subsequent transmissions.

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Номер записи: 19

29-03-2012 дата публикации

Method and System for an Alternating Delta Quantizer for Limited Feedback MIMO Pre-Coders

Номер: US20120076223A1

Автор: Jun Zheng, Mark Kent, Uri Landau, Vinko Erceg

Принадлежит: Broadcom Corp

Aspects of a method and system for an alternating delta quantizer for limited feedback MIMO pre-coders may comprise quantizing a change in channel state information in a MIMO pre-coding system onto at least a first and a second codebook, each of which comprises one or more unitary matrices, using a cost function; feeding back, in an alternating manner, an index to an element of at least the first codebook or the second codebook, associated with the quantizing, from a receiver to a transmitter in said MIMO pre-coding system, and generating the at least first and second codebook based on at least the channel state information. The channel state information may be a matrix V and the cost function may be defined by the following relationship: f  ( A ) = ( 1 N  ∑ j = 1 N   a jj  2 ) where A is a matrix of size N by N and a ij is element (i,j) of matrix A.

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Номер записи: 20

05-04-2012 дата публикации

Apparatus and method for controlling a wireless feeder network

Номер: US20120082061A1

Автор: Andrew Logothetis, Martin Lysejko

Принадлежит: Airspan Networks Inc

An apparatus and method are provided for controlling a wireless feeder network which connects access base stations to a communications network. The wireless feeder network comprises a plurality of feeder base stations connected to the communications network and a plurality of feeder terminals connected to the plurality of access base stations. A sounding schedule is determined for the wireless feeder network in dependence on a visibility matrix, the visibility matrix indicative of visibility via the wireless feeder network between each of the plurality of feeder base stations and each of the plurality of feeder terminals. Then a sounding procedure within the wireless feeder network is controlled in accordance with the sounding schedule. The visibility matrix enables a coordinated sounding procedure to be carried out, allowing more accurate channel metrics for the wireless channels of the network to be determined which are not adversely affected by interference between elements of the network.

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Номер записи: 21

26-04-2012 дата публикации

Transitioning from mimo to siso to save power

Номер: US20120099497A1

Автор: Harish Vaidya, Manoj Raveendranath Kamath, Rakesh Raman

Принадлежит: Broadcom Corp

Various example embodiments are disclosed. According to an example embodiment, an apparatus may include at least one processor and at least one memory. The at least one memory may include computer-executable code that, when executed by the processor, is configured to cause the apparatus to send a message to a node in wireless communication with the apparatus, the message indicating a transition by the apparatus from multiple-input multiple-output (MIMO) to single-input single-output (SISO), and transition from wireless MIMO communication with the node to wireless SISO communication with the node after sending the message to the node.

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Номер записи: 22

03-05-2012 дата публикации

Method and apparatus for communication with shortened signal formats

Номер: US20120106372A1

Автор: Aleksandar Damnjanovic, Juan Montojo, Peter Gaal, Wanshi Chen

Принадлежит: Qualcomm Inc

Techniques for addressing high interference observed by a receiver in a wireless communication system are disclosed. The receiver may observe different interference power levels across a transmission symbol. In an aspect, the receiver applies different weights to different portions of the transmission symbol to account for fluctuation of interference power across the transmission symbol. In another aspect, a transmitter may send a transmission symbol such that a receiver can ignore a portion of a symbol period with high interference. In one design, the transmitter generates a transmission symbol including at least two copies of a signal component. The transmitter transmits at least one copy of the signal component in a portion of the symbol period in which the receiver does not observe high interference. The receiver processes the at least one copy of the signal component to recover data sent in the transmission symbol.

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Номер записи: 23

03-05-2012 дата публикации

Methods and systems for enabling feedback in wireless communication networks

Номер: US20120106483A1

Автор: Hang Zhang, Jianglei Ma, Mo-Han Fong, Peiying Zhu, Wen Tong

Принадлежит: ROCKSTAR BIDCO LP

Aspects of the present invention provide additional MAC functionality to support the PHY features of a wireless communication system framework. The additional MAC functionality aids in enabling feedback from wireless terminals to base stations. In some aspects of the invention the feedback is provided on an allocated feedback channel. In other aspects of the invention the feedback is provided by MAC protocol data units (PDU) in a header, mini-header, or subheader. The feedback may be transmitted from the wireless terminal to the base station autonomously by the wireless terminal or in response to an indication from the base station that feedback is requested. Aspects of the invention also provide for allocating feedback resources to form a dedicated feedback channel. One or more of these enhancements is included in a given implementation. Base stations and wireless terminals are also described upon which methods described herein can be implemented.

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Номер записи: 24

10-05-2012 дата публикации

Receiver and method for reducing an amount of channel state information feedback to a transmitter

Номер: US20120115427A1

Автор: Dennis Hui, Jung-Fu Cheng, Kambiz Zangi, Leonid Krasny

Принадлежит: Individual

A receiver and a method are described herein for reducing an amount of channel state information related to a transmit channel correlation matrix φ TX that is feedback to a transmitter. In addition, to a transmitter and a method are described herein for reconstructing the transmit channel correlation matrix φ TX using the reduced channel state feedback information received from the receiver.

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Номер записи: 25

17-05-2012 дата публикации

Packet processing systems and methods

Номер: US20120120935A1

Автор: Mark A. Webster, Michael J. Seals

Принадлежит: Individual

Various packet processing systems and methods are disclosed. One method embodiment, among others, comprises providing a legacy long training symbol (LTS), and inserting subcarriers in the legacy LTS to form an extended LTS (ELTS).

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Номер записи: 26

17-05-2012 дата публикации

Apparatus for Transmitting and Receiving Data to Provide High-Speed Data Communication and Method Thereof

Номер: US20120121040A1

Автор: Deuk-Su Lyu, Eun-Young Choi, Hee-Jung Yu, Myung-Soon Kim, Sok-Kyu Lee, Taehyun Jeon

Принадлежит: Electronics and Telecommunications Research Institute ETRI

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

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Номер записи: 27

24-05-2012 дата публикации

Mobile terminal apparatus, radio base station apparatus, and radio communication method

Номер: US20120127953A1

Автор: Nobuhiko Miki, Teruo Kawamura, Yoshihisa Kishiyama

Принадлежит: NTT DOCOMO INC

To provide a radio communication method for enabling a control signal to be received with high quality and high efficiency, in the case of using spatial multiplexing transmission in data signals to transmit, and also transmitting the control signal in the same sub-frame, in the radio communication method of the invention, a mobile terminal apparatus receives a downlink signal including precoding information, separates a data signal and a control signal to assign to different radio resources, and performs MIMO-transmission on a signal of each transmission layer based on the precoding information, and a radio base station apparatus receives an uplink signal including the data signal and the control signal subjected to MIMO transmission, divides the uplink signal into data signals for each transmission layer, and reproduces the control signal from the uplink signal.

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Номер записи: 28

31-05-2012 дата публикации

Method and apparatus for detecting received signal in wireless communication system

Номер: US20120134438A1

Автор: Hwa-Sun You, Hyo-Yol Park

Принадлежит: SAMSUNG ELECTRONICS CO LTD

A method for detecting a received signal by a Base Station (BS) in a communication system is provided. The method includes receiving a BandWidth Request (BW REQ) indicator, determining first interference signal streams representing BW REQ messages, determining whether the first interference signal streams include at least one second interference signal stream which is in a null state, determining a first Maximum Likelihood (ML) metric, determining a second ML metric for each of a case where a value of bits constituting each of third interference signal streams except for the at least one second interference signal stream among the first interference signal streams is 1, and calculating a minimum error distance of the BW REQ messages received from Mobile Stations (MSs) based on the first ML metrics and the second ML metrics.

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Номер записи: 29

07-06-2012 дата публикации

Multiple-input multiple-output (mimo) antenna system

Номер: US20120139810A1

Автор: Antonio Faraone, Carlo Dinallo, Renato Cicchetti

Принадлежит: Motorola Inc

An antenna system includes a multi-port antenna with an active feeding network coupled thereto. The active feeding network applies complex weights to signals received from and transmitted to each port of the multi-port antenna. The complex weights are applied according to eigenvectors corresponding to a Hermitian matrix representation of the multi-port antenna. The Hermitian matrix may be base on such multi-port antenna parameters such as power dissipation, power radiation, real-power flow, volumetric storage of electromagnetic energy, and/or volumetric dissipation of electromagnetic energy. The multi-port antenna yields orthogonal electromagnetic fields in volumes or surfaces of interest in response to the active feeding network excitation.

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Номер записи: 30

07-06-2012 дата публикации

Method of exploitation of co-channel interference, apparatus and computer program

Номер: US20120140683A1

Автор: Fabien Buda, Serdar SEZGINER, Weixiao Xu

Принадлежит: Sequans Communications SA

A method of canceling co-channel interference of a signal received by a mobile station having at least two receiving antennas, in a cellular OFDMA-TDD communication network having a serving base station and at least one interfering base station. The signal is a result of a serving signal transmitted by the serving base station which is distorted by at least one interfering signal transmitted by the interfering base station. The serving signal is transmitted with a first modulation scheme and the interfering signal is transmitted with a second modulation scheme. The method includes: a channel estimation phase delivering channel estimations of the serving signal and the interfering signal; and a MIMO detecting phase, detecting symbols by using the channel estimations of the serving signal and the interfering signal. The MIMO detection phase is realized using a non-linear method which uses the first modulation scheme and the second modulation scheme.

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Номер записи: 31

07-06-2012 дата публикации

Method of generating adaptive codebook and multiple input multiple output communication system using the adaptive codebook

Номер: US20120140834A1

Автор: BRUNO Clerckx, David J. Love, Jun Il Choi, Ki Il Kim, Taejoon KIM

Принадлежит: PURDUE RESEARCH FOUNDATION, SAMSUNG ELECTRONICS CO LTD

Provided is a method of generating an adaptive codebook and a multiple input multiple output (MIMO) communication system using the adaptive codebook. A transmitter and a receiver may generate, from a base codebook based on a matrix associated with statistics of a channel matrix, the adaptive codebook maintaining a unitary characteristic. The transmitter may perform scheduling, transmit filter design, and precoding using adaptive codebook based feedback information.

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Номер записи: 32

07-06-2012 дата публикации

Signaling to protect advanced receiver performance in wireless local area networks (lans)

Номер: US20120140842A1

Автор: Albert Van Zelst, Didier Johannes Richard Van Nee, Hemanth Sampath, Sameer Vermani, Santosh Paul Abraham

Принадлежит: Qualcomm Inc

Certain aspects of the present disclosure relate to techniques that may be used to help control aspects of beamforming by a beamformee. According to certain aspects, a beamformee may be able to signal, to a beamformer, a maximum number of transmit spatial streams to use for single-user beamformed transmissions.

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Номер записи: 33

07-06-2012 дата публикации

Transmitting Terminal and Transmit Antenna Selecting Method Thereof

Номер: US20120140848A1

Автор: Gene C.H. Chuang, Pu-Hsuan Lin, Shang-Ho Tsai, Yung-Chuan Lin

Принадлежит: Industrial Technology Research Institute ITRI

A transmitting terminal includes a signal processing unit, M S RF units, M T transmit antennas and a switch unit. The signal processing unit has K precoders for precoding K data streams corresponding to K receiving terminals. The M S RF units output M S up-converted transmit signals based on the precoded K data streams. The switch unit is coupled between the RF units and the transmit antennas and controlled by the signal processing unit for selection of the transmit antennas. The signal processing unit sets the M T transmit antennas as a universal set, calculates a plurality of sum rates corresponding to a plurality of subsets, each subset excluding an i th transmit antenna, according to channel state information, selects the subset with a maximum sum rate as the universal set of a next iteration, and then repeats the calculating and selecting steps until the subset with the maximum sum rate remaining M S transmit antennas.

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Номер записи: 34

21-06-2012 дата публикации

Method For A canceling Self Interference Signal Using Passive Noise Cancellation For Full-Duplex Simultaneous (in Time) and Overlapping (In Space) Wireless transmission and Reception On The Same Frequency Band

Номер: US20120155336A1

Автор: Karthikeyan Sundaresan, Mohammad A. Khojastepour, Sampath Rangarajan

Принадлежит: NEC Laboratories America Inc

A method for full duplex communication that includes creating a canceling self interference signal using a passive noise cancellation, and attaining full-duplex simultaneous in time and overlapping in space wireless transmission and reception on same frequency band responsive to the step of creating a canceling self interference signal.

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Номер записи: 35

21-06-2012 дата публикации

Estimating frequency-offsets and multi-antenna channels in mimo ofdm systems

Номер: US20120155512A1

Автор: Georgios B. Giannakis, Xiaoli Ma

Принадлежит: University of Minnesota

Techniques are described for carrier frequency offset (CFO) and channel estimation of orthogonal frequency division multiplexing (OFDM) transmissions over multiple-input multiple-output (MIMO) frequency-selective fading channels. A wireless transmitter forms blocks of symbols by inserting training symbols within two or more blocks of information-bearing symbols. The transmitter applies a hopping code to each of the blocks of symbols to insert a null subcarrier at a different position within each of the blocks of symbols, and a modulator outputs a wireless signal in accordance with the blocks of symbols. A receiver receives the wireless signal and estimates the CFO, and outputs a stream of estimated symbols based on the estimated CFO.

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Номер записи: 36

19-07-2012 дата публикации

Communication method, and transmitting apparatus and receiving apparatus using that communication method

Номер: US20120182985A1

Автор: Akihiko Matsuoka, Masayuki Orihashi, Yoichi Nakagawa, Yutaka Murakami

Принадлежит: Panasonic Corp

A transmission apparatus includes a plurality of antennas and a frame configurator that selects, in a first unit time either a first transmitting method which transmits a modulated signal from at least one of the plurality of antennas, or a second transmitting method which transmits a plurality of modulated signals from the plurality of antennas, for a first carrier group arranged for a first terminal and either the first transmitting method or the second transmitting method for a second carrier group arranged for a second terminal. The frame configurator selects, in a second unit time either the first transmitting method or the second transmitting method for the first carrier group arranged for a third terminal and either the first transmitting method or the second transmitting method for the second carrier group arranged for a fourth terminal, wherein each of carrier groups includes one or more sub-carriers.

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Номер записи: 37

16-08-2012 дата публикации

Methods and apparatus for wireless coexistence based on transceiver chain emphasis

Номер: US20120207032A1

Автор: Arthur Lin, Camille Chen, Chris Hartman, Chris Zimmermann, Jaime Tolentino, Lei Li, Michael J. Giles

Принадлежит: Apple Inc

Methods and apparatus for reduction of interference between a plurality of wireless interfaces. In one exemplary embodiment, a device having a first (e.g., Wi-Fi) interface and a second (e.g., Bluetooth) interface monitors interference between its interfaces. A reduction in transmit power of the Wi-Fi module causes a disproportionately larger reduction in undesirable interference experienced at the Bluetooth antennas. For example, when the Bluetooth interface detects interference levels above acceptable thresholds, the Wi-Fi interface adjusts operation of one or more of its transmit chains based on various conditions such as duty cycle, Received Signal Strength Indication (RSSI), etc. Various embodiments of the present invention provide simultaneous operation of WLAN and PAN interfaces, without requiring time division coexistence, by reducing power on a subset of interfering antennas.

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Номер записи: 38

16-08-2012 дата публикации

Method and apparatus for downlink transmission based on mimo precoding in wireless communication system employing distributed antenna systems

Номер: US20120207145A1

Автор: Cheol Mun, Jin Kyu Han, Jong Kwan Yook, Sung Tae Kim, Youn Sun Kim

Принадлежит: Industry Academic Cooperation Foundation of Yonsei University, SAMSUNG ELECTRONICS CO LTD

A transmission method and apparatus utilizing Multiple-Input and Multiple-Output (MIMO) precoding based on Distributed Antenna Systems (DASs) are provided. The transmission method includes determining active antenna ports, for a User Equipment (UE) having multiple receive antennas, from among a plurality of Distributed Antenna Ports (DAPs) evenly placed in a service area; assigning a Multiple-Input and Multiple-Output (MIMO) mode to the UE and notifying the UE of the MIMO mode assignment; determining a signal precoding vector on a basis of feedback information for the MIMO mode received from the UE; and precoding a signal using the signal precoding vector and transmitting the precoded signal through the active antenna ports.

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Номер записи: 39

16-08-2012 дата публикации

Communication system, radio base station, and communication control method

Номер: US20120208546A1

Автор: Taku Nakayama

Принадлежит: Kyocera Corp

A radio base station ( 1 A) generates and holds associations each between a resource block and a piece of MIMO information and allocates, based on the associations, a resource block to radio terminals ( 2 A and 2 C) in the cell ( 3 A). When the radio terminals ( 2 A and 2 C) in the cell ( 3 A) suffers a predetermined level or higher level of interference caused by the communication between another radio base station ( 1 B) and a radio terminal ( 2 B) that exists in the cell ( 3 B) of the other radio base station ( 1 B), the radio base station ( 1 A) selects one of the associations each between a resource block and a piece of MIMO information and allocates, based on the selected association, a resource block to the radio terminals ( 2 A and 2 C) in the cell ( 3 A).

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Номер записи: 40

30-08-2012 дата публикации

Downlink 8 Tx Codebook Sub-Sampling for CSI Feedback

Номер: US20120218948A1

Автор: Eko N. Onggosanusi, Runhua Chen

Принадлежит: Texas Instruments Inc

This invention is codebook sub-sampling of the reporting of RI, CQI, W 1 and W 2 . If CSI mode 1 is selected RI and W 1 are jointly encoded using codebook sub-sampling in report 1 . If CSI mode 2 is selected W 1 and W 2 are jointly encoded using codebook sub-sampling in report 2.

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Номер записи: 41

06-09-2012 дата публикации

Method And Apparatus Supporting Improved Wide Bandwidth Transmissions

Номер: US20120224612A1

Автор: Ning Zhang, Youhan Kim

Принадлежит: Qualcomm Atheros Inc

A method for transmitting information in a wireless system is provided. In this method, the traffic on a plurality of channels can be determined. A bandwidth for a packet can be selected based on the traffic and available channel bandwidths. A modulation and a coding rate can be selected from a plurality of modulations and associated coding rates. The modulation and coding rate can be applied to a segment of the packet, wherein each segment includes one or more bandwidth units. The packet including the selected modulation and coding rate therein can be transmitted on at least one channel

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Номер записи: 42

06-09-2012 дата публикации

Method and Terminal for Channel State Information Feedback

Номер: US20120224652A1

Автор: Jun Xu, Shupeng Li, Yijian Chen, Yu Ngok Li

Принадлежит: ZTE Corp

The present invention discloses a method and terminal for feeding back channel status information, including: when the channel status information is fed back on the physical uplink control channel, code words contained in the used codebook C PUCCH (r) with a layer number or rank being r is a subset of the code words contained in the codebook C PUSCH (r) with a layer number or rank being r in the overall codebook defined in the LTE-A; wherein, the C PUCCH (r) is a single codebook or a single codebook equivalent to dual codebooks; and the C PUSCH (r) is a single codebook or a single codebook equivalent to the dual codebooks; and the single codebook equivalent to the dual codebooks means that the actually used codebook is an actually defined single codebook, however, 2 pre-coding matrix identifiers are required to determine the codebook of the code words therein for an established r. The method described by the present invention can ensure the precision of the PMI feedback under the limited overhead, make the CSI feedback on the PUCCH still be able to more effectively support the pre-coding technology and have good compatibility with the feedback on the PUSCH.

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Номер записи: 43

04-10-2012 дата публикации

Device, system and method of wireless communication

Номер: US20120250645A1

Автор: Daniel Yellin, Guy Wolf, Ilan Sutskover, Nadav Shulman, Yona Perets

Принадлежит: Intel Corp

Briefly, according to embodiments of the invention, there is provided a wireless communication system and a method to receive by a base station from a first mobile station a first chain of data symbols transmitted by at least two antennas and having a first transmit diversity, to receive from a second mobile station a second chain of data symbols transmitted by at least two antennas and having a second transmit diversity. Both first and second chains of data symbols are transmitted from the first and second mobile stations at the same time, modulated according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme and encoded by a space time block codes scheme.

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Номер записи: 44

04-10-2012 дата публикации

Method and device for pre-coding, and method and device for decoding

Номер: US20120250780A1

Автор: BIN Li, Hui Shen, YI LUO

Принадлежит: Huawei Technologies Co Ltd

The present invention relates to the field of wireless communications technologies, and discloses a method and device for pre-coding and a method and device for decoding. The present invention implements an interference alignment method with excellent performance, can effectively increase the capacity of a multi-user interference system and reduce the mutual interference among users, The method for pre-coding includes: calculating a pre-coding matrix for each transmitting end according to a sum of mean square errors of data vectors to be transmitted by each transmitting ends; and using the pre-coding matrix to pre-code the data to be transmitted by each transmitting end. The present invention has broad application prospects, for example, can be used in LTE and LTE-Advanced CoMP technology.

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Номер записи: 45

04-10-2012 дата публикации

Spatial spreading in a multi-antenna communication system

Номер: US20120250788A1

Автор: Jay Rodney Walton, John W. Ketchum, Lizhong Zheng, Mark S. Wallace, Steven J. Howard

Принадлежит: Qualcomm Inc

Spatial spreading is performed in a multi-antenna system to randomize an “effective” channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain N D data symbol blocks to be transmitted in N M transmission spans, where N D ≧1 and N M >1. The N D blocks are partitioned into N M data symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L>1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via N T transmit antennas in one transmission span. The N D data symbol blocks are thus spatially processed with N M steering matrices and observe an ensemble of channels.

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Номер записи: 46

11-10-2012 дата публикации

Method and apparatus of system scheduler

Номер: US20120257596A1

Автор: Daniel Yellin, Guy Wolf, Ilan Sutskover, Nadav Shulman, Yona Perets

Принадлежит: Intel Corp

Briefly, according to embodiments of the invention, there is provided a wireless communication system and a method to receive by a base station from a first mobile station a first chain of data symbols transmitted by at least two antennas and having a first transmit diversity, to receive from a second mobile station a second chain of data symbols transmitted by at least two antennas and having a second transmit diversity. Both first and second chains of data symbols are transmitted from the first and second mobile stations at the same time, modulated according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme and encoded by a space time block codes scheme.

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Номер записи: 47

11-10-2012 дата публикации

Communications system using beamforming

Номер: US20120257683A1

Автор: Andreas Schwager, Daniel Schneider, Lothar Stadelmeier

Принадлежит: Sony Corp

In a MIMO communications system a first communications device applies beamforming to a complete transmission packet including both synchronization data and either payload data or training symbols. A second communications device evaluates the beamformed synchronization data and determines and transmits a feedback information indicating minimum required synchronization data and/or a minimum number of training symbols. The first communications device tailors the synchronization data and/or number of training symbols on the basis of the feedback information. Beamforming the complete transmission packet facilitates signal suppression at defined locations. When the channel properties change, the second communications device may provide further channel state information to adapt beamforming in the first communications device without transmission of not beamformed training symbols. The communications system may be a powerline telecommunications system.

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Номер записи: 48

11-10-2012 дата публикации

Transmission and reception apparatus and method

Номер: US20120257688A1

Автор: Akihiko Matsuoka, Masayuki Orihashi, Yutaka Murakami

Принадлежит: Panasonic Corp

A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band. A reception apparatus is provided, which includes a plurality of antennas that receive a plurality of OFDM modulation signals; a plurality of OFDM demodulators that transform the plurality of OFDM modulation signals to a plurality of reception signals using Fourier transform; an estimator that outputs a distortion estimation signal using one or more symbols for demodulation included in the plurality of reception signals; and a demodulator that compensates for distortion of the reception signals using the distortion estimation signal and demodulates a data symbol included in the reception signals.

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Номер записи: 49

11-10-2012 дата публикации

Method for transceiving signal in mobile station in multiple antenna wireless communication system and apparatus therefor

Номер: US20120258716A1

Автор: Joondong LEE, Sangwoo Kim, Seungjin AHN, Sunghoon Jung, Wonyong Yoon

Принадлежит: LG ELECTRONICS INC

A mobile station provided with multiple antennas in a wireless communication system is disclosed. More specifically, the mobile station displays an overlap zone entry notification message received from a macro base station if the mobile station enters an overlap zone between the macro base station and a femto base station, and an user selects an antenna driving mode of the multiple antennas. And then, the mobile station transmit and receive signals to and from at least one of the macro base station and the femto base station in accordance with the selected antenna driving mode.

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Номер записи: 50

18-10-2012 дата публикации

Resource assignments for uplink control channel

Номер: US20120263124A1

Автор: Juan Montojo, Peter Gaal, Wanshi Chen, Xiliang Luo

Принадлежит: Qualcomm Inc

A wireless communication method includes allocating physical uplink control channel (PUCCH) data in first slot to a first orthogonal cover code (OCC). The method also includes allocating PUCCH data in a second slot of the same subframe to a different orthogonal cover code (OCC). Another method includes mapping PUCCH resources to physical resource blocks based on a user equipment (UE) specific signaling parameter (e.g., a resource index) and a number of symbols in a slot of a subframe.

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Номер записи: 51

25-10-2012 дата публикации

Downlink multiple input multiple output enhancements for single-cell with remote radio heads

Номер: US20120269278A1

Автор: Eko Onggosanusi, Runhua Chen, Vikram Chandrasekhar

Принадлежит: Texas Instruments Inc

A base station selects a subset of at least one geographically separated antennas for each of the plurality of user equipments. The base station forms at least layer of data stream including modulated symbols, precodes the data stream via multiplication with the NT-by-N precoding matrix where N is the number of said layers and NT is the number of transmit antenna elements and transmits the precoded layers of data stream to the user equipment via the selected geographically separated antennas. The base station signals the subset of the plurality of geographically separated antennas via higher layer Radio Resource Control or via a down link grant mechanism. The base station optionally does not signal the subset of the plurality of geographically separated antennas to the corresponding mobile user equipment.

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Номер записи: 52

25-10-2012 дата публикации

System and method for simultaneous mimo signal testing with single vector signal analyzer

Номер: US20120269288A1

Автор: Christian Volf Olgaard, Ruizu Wang

Принадлежит: Litepoint Corp

Signal conversion circuitry and method for converting a multiple input, multiple output (MIMO) packet data signal transmission to a plurality of complex data samples for processing by shared test equipment, e.g., a single vector signal analyzer (VSA).

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Номер записи: 53

08-11-2012 дата публикации

Measurement and feedback calculation for wireless communication network

Номер: US20120281552A1

Автор: Ayelet Shahar Doron, Huaning Niu, Yi Hsuan

Принадлежит: Intel Corp

A method for performing measurement by a radio apparatus is presented. In one embodiment, the method includes determining raw measurements (e.g., a channel estimation and a noise variance estimation) of a subband and determining a rank indicator (RI) without requiring a precoding matrix indicator (PMI) search. The method includes calculating, based at least on the raw measurements, a mean instantaneous capacity (MIC) for the subband and determining a channel quality indicator (CQI) and a PMI based at least on the MIC. In one embodiment, the method uses subband-based measurements for performing feedback/measurement.

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Номер записи: 54

08-11-2012 дата публикации

System and method for uplink multiple input multiple output transmission

Номер: US20120281642A1

Автор: Sharad Deepak Sambhwani, Sony John Akkarakaran

Принадлежит: Qualcomm Inc

Methods and apparatuses are provided for uplink MIMO transmissions in a wireless communication system. In particular, scheduled uplink transmission power is allocated between a primary stream including an E-DPDCH and a secondary stream including an S-E-DPDCH. Specifically, a ratio between the power of the E-DPDCH and a primary pilot channel DPCCH, as well as a ratio between the power of the S-E-DPCCH and an unboosted power of the S-DPCCH, each corresponds to a first traffic to pilot power ratio. Further, the transport block size for a primary transport block provided on the E-DPDCH is determined based on the first traffic to pilot power ratio, while the transport block size for a secondary transport block provided on the S-E-DPDCH is determined based on a second traffic to pilot power ratio.

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Номер записи: 55

15-11-2012 дата публикации

System and method for uplink multiple input multiple output transmission

Номер: US20120287867A1

Автор: Sharad Deepak Sambhwani, Sony John Akkarakaran

Принадлежит: Qualcomm Inc

Methods and apparatuses are provided for uplink MIMO transmissions in a wireless communication system. In particular, an enhanced pilot reference may be provided for enabling increased data rates on a secondary stream. Specifically, a primary stream, provided on a primary virtual antenna, includes an enhanced primary data channel E-DPDCH, a primary control channel DPCCH, and an enhanced primary control channel E-DPCCH. Further, a secondary stream, provided on a secondary virtual antenna, includes an enhanced secondary data channel S-E-DPDCH and a secondary control channel S-DPCCH. Here, the secondary control channel S-DPCCH may be transmitted at a boosted power level relative to a determined reference power level.

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Номер записи: 56

15-11-2012 дата публикации

Multiple input multiple output and beam-forming data transmission method and device

Номер: US20120287981A1

Автор: Dengkui Zhu, Huahua Xiao, Kun Liu, Wanshuai Zhang, Zhaohua Lu

Принадлежит: ZTE Corp

The present invention provides a method and system for transmitting Multiple Input Multiple Output (MIMO) beam forming data. The method comprises: performing MIMO coding on data streams to obtain the coded data streams; obtaining weight values W=(W i,j ) Tx×S for beam forming of an antenna array of Tx×S of a transmitting end based on channel information from the antenna array of the transmitting end to antennas of a receiving end, where Tx is the number of transmitting antennas of the transmitting end, S is the number of the MIMO-coded data streams, and S≦Tx; and weighting the coded data streams with the weight values W=(W i,j ) Tx×S for beam forming, and transmitting the weighted data streams by corresponding antennas, where the data transmitted by antenna i is superposed data Σ j=1 S W i,j x j , i=1, . . . , Tx, j=1, . . . , S, and x j is j th coded data stream.

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Номер записи: 57

15-11-2012 дата публикации

Method and Device for Determining a Cooperation Area

Номер: US20120289240A1

Автор: Wolfgang Mennerich, Wolfgang Zirwas

Принадлежит: NOKIA SIEMENS NETWORKS OY

A method and a device for determining a cooperation area for a mobile terminal in a cellular network, wherein the mobile terminal determines its n strongest interferers; wherein the cooperation area is selected for the mobile terminal regarding the n strongest interferers; and wherein the cooperation area includes m base stations and wherein the number m of base stations is larger than the number n of strongest interferers. Furthermore, a communication system is suggested including said device.

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Номер записи: 58

06-12-2012 дата публикации

Method and user terminal for multi-site multi-user joint transmission

Номер: US20120307672A1

Автор: Dong Li, HAO LIU, Yang Song

Принадлежит: Individual

The present invention proposes a method for multi-site multi-user joint transmission, the method comprising: measuring, by a user terminal, a downlink channel originated from each base station; according to the measurement for the downlink channel, quantizing and obtaining, by the user terminal, per-site channel information for the each base station and additional inter-site channel information, the additional inter-site channel information being used for calculating joint channel information of multiple base stations; and feeding back, by the user terminal, the per-site channel information for the each base station and the additional inter-site channel information so that the base station performs scheduling to execute the multi-site multi-user joint transmission.

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Номер записи: 59

13-12-2012 дата публикации

Multiple input multiple output (mu-mimo) apparatus and methods

Номер: US20120314654A1

Автор: Jayakrishnan C. Mundarath, Jayesh H. Kotecha

Принадлежит: Individual

A multi-user MIMO downlink beamforming system ( 200 ) is provided to enable transmit beamforming vectors to be efficiently provided to a subset of user equipment devices ( 201. i ), where spatial separation or zero-forcing transmit beamformers (w i ) are computed at the base station ( 210 ) and used to generate precoded reference signals ( 216 ). The precoded reference signals ( 216 ) are fed forward to the user equipment devices ( 201. i ) which apply one or more hypothesis tests ( 207. i, 208. i ) to the precoded reference signals to extract the precoding matrix (W), including the specific transmit beamforming vector (W UE ) designed for the user equipment, and this extracted information is used to generate receive beamformers (v i ).

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Номер записи: 60

13-12-2012 дата публикации

Method of generating a codebook

Номер: US20120314792A1

Автор: Choo Chiap Chiau, Milos Tesanovic, Timothy James Moulsley

Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

A precoding codebook matrix/vector of length 2L is generated by the selection of two matrices/vectors, each from one of a predetermined set of L×L matrices and multiplying each column of one of the matrices/vectors by a complex coefficient.

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Номер записи: 61

13-12-2012 дата публикации

Transmitting apparatus, transmission method, receiving apparatus, and receiving method

Номер: US20120314803A1

Автор: Akihiko Matsuoka, Kiyotaka Kobayashi, Masayuki Orihashi, Yutaka Murakami

Принадлежит: Panasonic Corp

A transmitting apparatus and method transmits different modulated signals from a plurality of antennas, and employs a configuration that includes a modulation section that obtains a modulated signal by performing signal point mapping of transmit bits using a signal point arrangement that is divided into a plurality of signal point sets on the IQ plane, whereby the minimum distance between signal points within a signal point set is smaller than the minimum signal point distance between signal point sets; and an antenna that transmits a modulated signal obtained by the modulation section. A signal point generating apparatus generates a first and second symbols to be transmitted by first and second antennas, respectively.

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Номер записи: 62

13-12-2012 дата публикации

Wireless transmitting apparatus, wireless receiving apparatus, wireless communication system, wireless transmitting method and wireless receiving method

Номер: US20120314805A1

Автор: Hidekazu Tsuboi, Waho Oh, Yasuhiro Hamaguchi, Yasuyuki Kato

Принадлежит: Individual

To enable shared control information to be demodulated without requiring advance information on a MIMO block or non-MIMO block prior to demodulation of the shared control information of the block, and further enable the shared control information to be demodulated early. A wireless transmitting apparatus which performs wireless transmission in MIMO or non-MIMO for each radio frame comprised of a block or a plurality of blocks, and has mapping sections ( 110 - 1 to 110 - n ) that perform mapping of pilot signals to perform propagation path estimation, specific data, and user data, where the mapping sections perform mapping so that the specific data is transmitted in non-MIMO in the block or the radio frame transmitted in MIMO, and that an antenna that transmits the specific data is beforehand associated with an antenna that transmits a pilot signal to perform propagation path estimation.

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Номер записи: 63

27-12-2012 дата публикации

Method and apparatus for controlling uplink transmission power

Номер: US20120327804A1

Автор: Binchul Ihm, Dongcheol Kim, Jinyoung Chun, Jiwon Kang, Kitae Kim, Sunam Kim, Sungho Park

Принадлежит: LG ELECTRONICS INC

The present description relates to a method for controlling uplink power in a distributed multi-node system, comprising the following steps: receiving reference signals from a plurality of antenna nodes containing at least one antenna; estimating average propagation loss on the basis of the receiving power of the reference signals received from the plurality of antenna nodes; receiving, via a downlink control channel, noise and interference (NI) information from a base station which contains the plurality of antenna nodes; and determining uplink transmission power using the estimated average propagation loss and the received noise and interference information.

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Номер записи: 64

27-12-2012 дата публикации

Method and apparatus for transmitting a frame in a wireless ran system

Номер: US20120327862A1

Автор: Bong Hoe Kim, Byeong Woo Kang, Dae Won Lee, Yong Ho Seok, Yu Jin Noh

Принадлежит: Individual

There is provided a method and apparatus for transmitting a frame which is performed by a transmission STA in a WLAN system. The method of transmitting a frame includes generating an MAC Protocol Data Unit (MPDU) to be transmitted to a target station, generating a PLCP Protocol Data Unit (PPDU) by attaching a Physical Layer Convergence Procedure (PLCP) header to the MPDU, and transmitting the PPDU to the target station. The PLCP header comprises a partial Association ID (AID) of the target station.

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Номер записи: 65

27-12-2012 дата публикации

Anti-geolocation

Номер: US20120328037A1

Автор: Anis Husain, David Smith, Jeremy Rode, Maha Achour, Mark Hsu

Принадлежит: Ziva Corp

Methods, apparatus, and articles of manufacture make Geolocation of a source transmitter more difficult or impossible. Scatterers common to a source transmitter and an intended receiver are identified using a variety of techniques, such as iterative time reversal (ITR) and Singular Value Decomposition (SVD) of a scatter matrix. The source transmitter then uses time reversal and knowledge of the signatures of the scatterers to focus its transmissions on one or more of the scatterers, instead of the intended receiver. The source transmitter may have multiple antennas or antenna elements. The source transmitter and/or the intended receiver may include antenna elements with Near-Field Scatterers to enable spatial focusing below the diffraction limit at the frequencies of interest. The source transmitter may be a plurality of ad hoc nodes cooperating with each other.

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Номер записи: 66

17-01-2013 дата публикации

Mimo delta-sigma delta analog-to-digital converter using noise canceling

Номер: US20130015987A1

Автор: Ayman Shabra

Принадлежит: Mediatek Singapore Pte Ltd

A multi-input-multi-output-system (MIMO) is provided that includes a first input signal and a second input signal. A plurality of analog-to-digital converter (ADC) cell structures receive as input a combination of the first input signal and the second input signal as well as a combination of quantization noise signals from the respective other ADC cell structures of the plurality of ADC cell structures. The ADC cell structures generate a plurality of first output signals and the noise quantization signals. A plurality of adder modules receive the first output signals and performing either addition or subtraction on a selected combination of the first output signals, the adder modules generate a plurality of second output signals. A plurality of division modules receive the second output signals and perform a division operation on the second output signals by a predetermined factor. The division modules generate a plurality of final output signals of the MIMO.

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Номер записи: 67

17-01-2013 дата публикации

Method and apparatus for determining channel state information

Номер: US20130016767A1

Автор: Andreas Bury, Johan Pean

Принадлежит: INTEL MOBILE COMMUNICATIONS TECHNOLOGY DRESDEN GMBH

A mobile station receiving a signal from a base station experiences time/frequency varying channel conditions. In order to get the maximum throughput from a base-station, it is necessary to adjust the modulation and coding schemes to the actual channel quality. To do so, mobile receivers are required to probe the radio channel condition and feedback a limited set of estimated channel state information parameters such as CQI, RI, and PMI. The invention uses modulation-specific mutual information as a basic metric for CQI-PMI-RI computation to yield high bandwidth efficiency under both flat fading and interference conditions as well as time and frequency selective fading and interference conditions, at reasonable complexity.

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Номер записи: 68

24-01-2013 дата публикации

Method and apparatus for providing downlink control information in an mimo wireless communication system

Номер: US20130021991A1

Автор: Bin Chul Ihm, Hyun Soo Ko, Jae Hoon Chung, Moon Il Lee

Принадлежит: LG ELECTRONICS INC

The present invention relates to a method in which a user equipment receives a downlink signal from a base station in a wireless communication system that supports downlink MIMO transmission according to one embodiment of the present invention comprises: receiving downlink control information that includes information indicative of the number of layers (N, 1≦N≦8) where one or two enabled code words of the downlink MIMO transmission are mapped; on the basis of the downlink control information, receiving downlink data transmitted over the respective N layers and a UE-specific reference signal for each of the N layers; and decoding the downlink data on the basis of the UE-specific reference signals, wherein the information indicative of the number of layers can further include information on a code for identifying the UE-specific reference signals.

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Номер записи: 69

24-01-2013 дата публикации

Base station and method for implementing an adaptive closed-loop mimo and open-loop mimo technique in a wireless communication system

Номер: US20130022142A1

Автор: Sairamesh Nammi

Принадлежит: Individual

A base station and a method are described herein that implement an adaptive closed-loop MIMO and open-loop MIMO technique which accounts for all channel conditions and improves the performance of communications with a user equipment. In one example, the base station and method analyze a current user equipment report and a previous user equipment report received from a user equipment to determine if at least one channel condition parameter has a rate of change greater than a corresponding at least one threshold and if yes then use an open-loop MIMO technique and if no then use a closed-loop MIMO technique when interacting with the user equipment.

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Номер записи: 70

24-01-2013 дата публикации

Enhanced lattice reduction systems and methods

Номер: US20130022155A2

Автор: Qi Zhou, Xiaoli Ma

Принадлежит: Georgia Tech Research Corp

An exemplary embodiment of the present invention provides a lattice reduction method comprising obtaining a preliminary estimate of a transformation matrix, generating a covariance matrix based on the preliminary estimate of the transformation matrix, reducing diagonal elements of the covariance matrix to generate a unimodular transformation matrix, and using the unimodular transformation matrix to obtain an estimate of an input.

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Номер записи: 71

31-01-2013 дата публикации

System and Method for MIMO Split-Physical Layer Scheme for a Wireless Network

Номер: US20130028210A1

Автор: William Gage

Принадлежит: Research in Motion Ltd

A system employing split-PHY functionality across multiple access heads to establish multiple paths between a client device (CD) and an access network. Space-time coding includes transmitting one or multiple spatial streams through each access head. Macro transmit diversity includes transmitting a same signal, consisting of one or more spatial streams, from one or more access heads. A CD uses a strongest signal transmitted from at least one access head or diversity combining of two or more signals to recover the signal. Space-time coding includes receiving one or multiple spatial streams through each access head. Macro receive diversity includes receiving a same signal from a CD at one or more access heads. A strongest received signal is used to recover a signal or diversity combining of two or more signals received at different access heads is used to recover the transmitted signal.

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Номер записи: 72

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: 73

28-02-2013 дата публикации

Method and apparatus for multiplexing control information and data, and for transmitting the multiplexed control information and data in a mimo wireless communication system

Номер: US20130051369A1

Автор: Hyunsoo Ko, Jaehoon Chung, Jiwoong Jang, Moonil Lee, SEUNGHEE HAN

Принадлежит: LG ELECTRONICS INC

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting uplink control information in a wireless communication system. A method for multiplexing uplink control information and uplink data and for transmitting the multiplexed uplink control information and uplink data according to one embodiment of the present invention comprises the following steps: encoding a first transmission block and a second transmission block to generate a first codeword and a second codeword; mapping the first codeword and the second codeword to one or more layers, respectively; and transmitting, via one or more antenna ports, each layer to which the first codeword and the second codeword are mapped, wherein the uplink control information is multiplexed only to either the first transmission block or to the second transmission block.

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Номер записи: 74

07-03-2013 дата публикации

Integrity and Quality Monitoring and Signaling for Sounding and Reduced Feedback

Номер: US20130058239A1

Автор: Chao-chun WANG, Huanchun Ye, James June-Ming Wang, Jianhan Liu, Vishakan Ponnampalam

Принадлежит: Mediatek Singapore Pte Ltd

A method of sounding and feedback with channel quality information and reduced overhead is provided. A receiving station receives a sounding signal transmitted from an access point over multiple sub-channels of a wide channel in a wireless network. The receiving station detects channel quality based on the received sounding signal for each sub-channel. The receiving station then performs channel estimation based on the received sounding signal and thereby determining feedback information. Finally, the receiving station transmits a feedback message to the access point, the feedback message contains NULL feedback information, reduced feedback information, or channel integrity/quality indicators based on the channel quality information for each sub-channel. Based on the feedback message, the access point may repeat the sounding process, narrow the transmission bandwidth, or select only stations who have indicated uncorrupted channel sounding for MU-MMO transmission.

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Номер записи: 75

14-03-2013 дата публикации

Receiving apparatus and data obtaining method

Номер: US20130064184A1

Автор: Hiroyuki Ishii

Принадлежит: Individual

A receiving apparatus for communication area evaluation includes a receiving unit configured to receive a first signal transmitted from a base station; a delay profile calculation unit configured to calculate a downlink delay profile based on the first signal; and an estimated value calculation unit configured to calculate an estimated cyclic prefix length based on the calculated downlink delay profile.

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Номер записи: 76

21-03-2013 дата публикации

Method and apparatus for the efficient transmission of control information for supporting uplink transmission using multiple antennas

Номер: US20130070702A1

Автор: Hyun Soo Ko, Jae Hoon Chung, Moon Il Lee, Seung Hee Han

Принадлежит: LG ELECTRONICS INC

The present invention relates to a wireless communication system, and to a method and apparatus for efficiently transmitting control information for supporting an uplink transmitting technique using multiple antennas. According to one embodiment of the present invention, the method for transmitting control information for an uplink transmission using multiple antennas comprises the following steps: receiving a plurality of data blocks; transmitting ACK/NACK information for the received data blocks via a PHICH; transmitting, via a PDCCH, information containing an indicator which indicates whether to retransmit each of the plurality of data blocks; and receiving an uplink transmission in accordance with the combination of the ACK/NACK information and the information indicated by the indicator.

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Номер записи: 77

21-03-2013 дата публикации

High Speed Multi-Mode Fiber Transmissions via Orthogonal Wavefronts

Номер: US20130071105A1

Автор: Donald C. D. Chang

Принадлежит: Spatial Digital Systems Inc

A system is provided for high speed optical fiber data transmission by generating artificial wavefronts along multiple paths exhibiting spatial mutual orthogonality. Multiple independent signal streams are “structured” over a group of different propagation paths that are coherently organized by wavefront multiplexing and de-multiplexing techniques. Therefore, signal streams with enhanced throughput and reliability may be fully recovered at destinations via embedded diagnostic signals and optimization loops. Multiple optical channels are matched with multiple orthogonal wavefronts created by a signal pre-processor. A receiving end signal post-processor dynamically aligns propagation paths via diagnostic signals and orthogonality of the propagation wavefronts electronically. The multiple optical channels are coherently bonded into a single virtual channel, thereby increasing data bandwidth while reducing interference and unwanted multi-path effects. The wavefront multiplexing and de-multiplexing functions may be performed in a dedicated signal processor or may reside in a general-purpose microprocessor located in the user terminal.

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Номер записи: 78

28-03-2013 дата публикации

COMMUNICATION APPARATUS AND RESOURCE DERIVATION METHOD

Номер: US20130077465A1

Автор: Iwasaki Motoya, Sasaki Takahiro

Принадлежит: NEC Corporation

This invention is applied to a communication apparatus that uses one or more code words to transmit or receive appropriate information on a PUSCH. Assuming that the i-th code word CW_i is used alone to transmit the appropriate information, the communication apparatus of the invention uses a Formula (1) to calculate the number of resources Q′_i. When one or more code words are used to transmit the appropriate information, the communication apparatus uses a Formula (2) to calculate the number of resources Q′. 7. The communication apparatus as set forth in claim 4 , wherein said control unit switches the value of α according to the modulation method of the code word.8. The communication apparatus as set forth in claim 4 , wherein:said communication apparatus is either of a mobile unit or a base station, andas α, an appropriate value is shared by said mobile unit and said base station.9. The communication apparatus as set forth in claim 1 , wherein said control unit calculates the number of bits Q̂i of said appropriate information that is to be mapped to the icode word by using the following formula:{'br': None, 'i': Q', 'Q', '·L', 'Q′, 'sup': i', 'i', 'i, 'sub': 'm', '=()·\u2003\u2003Formula 13'}{'sup': th', 'th, 'where Q_m̂i is the number of bits that can be transmitted by one resource by the modulation method of the icode word, and L̂i is the number of layers of the icode word.'}16. The resource derivation method as set forth in claim 13 , wherein the value of α is switched according to the modulation method of code words.17. The resource derivation method as set forth in claim 13 , wherein:said communication apparatus is either a mobile unit or a base station; and as α, a value that is determined in advance is shared by said mobile unit and said base station.18. The resource derivation method as set forth in claim 10 , wherein:{'sup': 'th', 'claim-text': {'br': None, 'i': Q', 'Q', '·L', 'Q′, 'sup': i', 'i', 'i, 'sub': 'm', '=()·\u2003\u2003Formula 26'}, 'said ...

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Номер записи: 79

28-03-2013 дата публикации

Methods and apparatus for mimo detection

Номер: US20130077721A1

Автор: Ankit Gupta, Chaiman Lim, Zhouyue Pi

Принадлежит: SAMSUNG ELECTRONICS CO LTD

A transmitted signal estimate based on signals received in a layer i within a multiple input, multiple output transmission system and based upon selected constellation points for other, previously processed layers is quantized to a nearest constellation point. A list of candidates headed by the nearest constellation point and with remaining candidates presorted by proximity to the head is selected, for each such quantized estimate based on constellation point selections for previously processed layers. To select K best candidates for the transmitted signal estimates of the current layer i, the proximity of the candidates at the head of each list to the signal estimate for the current layer are compared, and the closest candidate is selected. The list containing the selected candidate is advanced, and proximity of the transmitted signal estimate to all list heads is again evaluated and the closest candidate selected.

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Номер записи: 80

28-03-2013 дата публикации

Node in a Communication System with Switchable Antenna Functions

Номер: US20130079047A1

Автор: Anders Derneryd, Andreas Nilsson, Jonas FRIDÉN, Lars Manholm

Принадлежит: Telefonaktiebolaget LM Ericsson AB

The present invention relates to a node ( 1 ) in a wireless communication system, the node ( 1 ) comprising at least a first and second antenna function ( 2, 3 ), and a first and second radio chain ( 4, 5 ). At least at the start of a first mode of operation, each antenna function ( 2, 3 ) is connected to a corresponding radio chain ( 4, 5 ). The node further comprises a switching network ( 6 ) and a beamforming network ( 7 ), which switching network ( 6 ), at least at the start of a second mode of operation, is arranged to disconnect at least one antenna function ( 2 ) from its corresponding radio chain ( 4 ) and connect it to another of the radio chains ( 5 ) via at least a part of the beamforming network ( 7 ), such that at least two antenna functions ( 2, 3 ) are connected to the same radio chain ( 5 ). The node ( 1 ) is arranged to perform beamforming for said at least two antenna functions ( 2, 3 ) by means of said beamforming network ( 7 ), the switching network ( 6 ) being arranged to switch between the first mode and the second mode.

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Номер записи: 81

04-04-2013 дата публикации

METHOD FOR DIFFERENTIALLY QUANTIZING CHANNEL INFORMATION IN MULTI-ANTENNA WIRELESS SYSTEMS AND SYSTEM ADOPTING THE SAME

Номер: US20130083685A1

Автор: Cho Hee-Nam, Lee Jin-Woo, Lee Yong Hwan

Принадлежит: SNU R&DB FOUNDATION

A method of signal transmission based on differentially quantized channel information in a multi-antenna wireless communication system which can transmit signal to multiple mobile stations simultaneously through multiple transmit antennas includes a main codebook reporting step of each mobile station for quantizing channel correlation information (CCI) using a main-codebook and reporting an index of the main codebook, which corresponds to the quantized CCI, to a base station. A sub-codebook reporting step of each mobile station for quantizing the change of the CCI between the quantization interval using a sub-codebook and reporting an index of the sub-codebook, which corresponds to the quantized CCI change, to a base station. A multi-user eigen-beam transmission step of the base station for generating multiple eigen-beams using the index of the main-codebook or sub-codebook reported from mobile stations and transmitting them to multiple users simultaneously. 1. A method of signal transmission based on differentially quantized channel information in a multi-antenna wireless communication system which can transmit signal to multiple mobile stations simultaneously through multiple transmit antennas , comprising:a main codebook reporting step of each mobile station for quantizing channel correlation information (CCI) using a main-codebook and reporting an index of the main codebook, which corresponds to the quantized CCI, to a base station, anda sub-codebook reporting step of each mobile station for quantizing the change of the CCI between the quantization interval using a sub-codebook and reporting an index of the sub-codebook, which corresponds to the quantized CCI change, to a base station,a multi-user eigen-beam transmission step of the base station for generating multiple eigen-beams using the index of the main-codebook or sub-codebook reported from mobile stations, and transmitting them to multiple users simultaneously.2. The method of claim 1 , further comprising ...

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Номер записи: 82

04-04-2013 дата публикации

DATA TRANSMITTING METHOD, BASE STATION APPARATUS AND MOBILE STATION APPARATUS

Номер: US20130083757A1

Автор: Kakishima Yuichi, Taoka Hidekazu

Принадлежит: NTT DOCOMO, INC.

A data rate in MIMO transmission is increased to a maximum even when the number of transmitting antennas of a mobile station apparatus is different from the number of transmitting antennas of the mobile station apparatus supported by a base station apparatus. The base station apparatus (eNodeB) reports the maximum number of supported antennas of the mobile station apparatus (UE) supported by the base station apparatus (eNodeB) to the mobile station apparatus (UE) (ST). The mobile station apparatus (UE) compares the number of supported antennas with the number of transmitting antennas of the mobile station apparatus (UE), selects the smaller number of antennas as a number of virtual antennas (ST), and reports the number of virtual antennas to the base station apparatus (eNodeB) (ST). The base station apparatus (eNodeB) instructs the mobile station apparatus to transmit a data channel signal in accordance with the number of virtual antennas (ST). The mobile station apparatus (UE) transmits a data channel signal to the base station apparatus (eNodeB) in accordance with the number of virtual antennas (ST). 1. A data transmitting method comprising:a step of reporting a maximum number of supported antennas of a mobile station apparatus supported by a base station apparatus to the mobile station apparatus;a step of the mobile station apparatus comparing the number of supported antennas with the number of transmitting antennas of the mobile station apparatus and selecting the smaller number of antennas as a number of virtual antennas;a step of reporting the number of virtual antennas to the base station apparatus;a step of instructing the mobile station apparatus to transmit a data channel signal in accordance with the number of virtual antennas; anda step of transmitting the data channel signal from the mobile station apparatus in accordance with the number of virtual antennas.2. The data transmitting method according to claim 1 , whereinthe number of supported antennas is ...

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Номер записи: 83

04-04-2013 дата публикации

Apparatus and method for channel quality feedback with a k-best detector in a wireless network

Номер: US20130083835A1

Автор: Ankit Gupta

Принадлежит: SAMSUNG ELECTRONICS CO LTD

A receiver in a multiple input, multiple output (MIMO) system is configured to perform a method for generating channel quality feedback information. The method includes receiving, from a MIMO transmitter, pilot signals in each MIMO layer. The method also includes estimating the MIMO channel using the received pilot signals and performing a QR decomposition of the estimated MIMO channel. The method further includes predicting a probability of error for each MIMO layer after the QR decomposition of the estimated MIMO channel. The method still further includes determining a corresponding signal-to-noise ratio (SNR) for each MIMO layer based on the probability of error for the each MIMO layer.

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Номер записи: 84

04-04-2013 дата публикации

Method for operating a secondary station

Номер: US20130083864A1

Автор: Timothy James Moulsley

Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

The invention relates to a method for operating a secondary station in a communication network including a primary station, the method comprising generating a pre-coding matrix obtained from the Hadamard product of an alphabet modifying matrix and an original pre-coding matrix, wherein the original precoding matrix consist of complex coefficients of equal magnitude, transmitting a precoding report representative of the precoding matrix to the primary station.

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Номер записи: 85

18-04-2013 дата публикации

METHOD FOR TRANSMITTING CHANNEL INFORMATION, DEVICE THEREOF, BASE STATION, AND METHOD FOR TRANSMITTING FOR BASE STATION THEREOF

Номер: US20130094548A1

Автор: Park Kyoungmin

Принадлежит: Pantech Co., Ltd.

The present disclosure relates to transmission and reception using a multiple-input multiple-output (MIMO) antenna in a wireless communication system in which a method includes: receiving a reference signal to estimate a channel; estimating a suitable pre-coding matrix from the estimated channel similar to a Discrete Fourier Transform (DFT) matrix which has at least two different DFT code books; providing a relatively large DFT matrix subset with a pre-coding matrix phase different from the set of said suitable pre-coding matrix; generating channel information which includes multiple access information on at least one DFT matrix which is small enough to be similar to said subset pre-coding matrix; and transmitting said channel information generated in said channel information generating step. 1. A transmission method of channel information by an apparatus in a estimating a channel by receiving a reference signal;', 'estimating a precoding matrix suitable for the estimated channel from a Discrete Fourier Transform (DFT) codebook including two or more sets having different similarities of DFT matrixes, configuring a subset by DFT matrixes having a relatively large phase difference from the precoding matrix in a set including the precoding matrix, and generating channel information containing multiple access information on one or more DFT matrixes having a sufficiently low similarity with the precoding matrix within the subset; and', 'transmitting the channel information generated in generating the channel information into an air., 'wireless communication system, the method comprising2. The transmission method as claimed in claim 1 , wherein the multiple access information is an index (best companion indicator) corresponding to the one or more DFT matrixes having the sufficiently low similarity with the precoding matrix.3. The transmission method as claimed in claim 1 , wherein claim 1 , when a number of bits expressing indexes corresponding to DFT matrixes included in ...

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Номер записи: 86

18-04-2013 дата публикации

Method and device for determining a number of mimo layers

Номер: US20130095816A1

Автор: Daniel Larsson, Dirk Gerstenberger, Henning Wiemann, Kai-Erík Sunell

Принадлежит: Individual

The embodiments herein relate to a method in a base station for communicating with a user equipment in the communication network. The base station is configured to communicate with the user equipment according to a selectable of at least two user equipment categories. Based on information about a selected user equipment category, the base station determines a first number of maximum transmission layers supported by the base station. The base station communicates with the user equipment according to up to the determined first number of maximum transmission layers and according to the selected user equipment category.

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Номер записи: 87

25-04-2013 дата публикации

Method and Apparatus for Balancing Power Between Antennas, and Base Station

Номер: US20130100997A1

Автор: Lv Fangfang, Wang Chengyi, Xiao Xuan, Yin Ting, Zhang Jinlin

Принадлежит: Huawei Technologies Co., Ltd.

A method and an apparatus for balancing power between antennas, and a base station are provided. The method includes multiplying n virtual antenna signals by an orthogonal matrix to obtain n intermediate regulative signals; and using a corresponding rotary phase to rotate phases of m of the n intermediate regulative signals, so that a phase difference exists between at least two of n physical antenna signals output by antennas. 1. A method for balancing power between antennas , the method comprising:multiplying n virtual antenna signals by an orthogonal matrix to obtain n intermediate regulative signals, wherein n is an integer that fulfills n≧2; andusing a corresponding rotary phase to rotate phases of m of the n intermediate regulative signals, wherein m is an integer that fulfills 1≦m≦n, so that a phase difference exists between at least two of n physical antenna signals output by antennas.2. The method according to claim 1 , wherein using the corresponding rotary phase to rotate the phases of the m of the n intermediate regulative signals comprises multiplying the m intermediate regulative signals by e claim 1 , wherein θis a rotary phase corresponding to the m intermediate regulative signals and p is a sequence number of the intermediate regulative signal claim 1 , where pε[1 claim 1 , m].3. The method according to claim 1 , further comprising outputting the n physical antenna signals through the antennas.4. The method according to claim 3 , wherein after outputting the n physical antenna signals through the antennas claim 3 , the method further comprises:obtaining a channel quality indication (CQI) statistic value for locking determination under each rotary phase;finding a maximum CQI statistic value among obtained CQI statistic values for locking determination; anddetermining whether to lock a phase corresponding to the maximum CQI statistic value by using the CQI statistic value for locking determination.5. The method according to claim 4 , wherein rotating ...

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Номер записи: 88

25-04-2013 дата публикации

Methods and Systems for Near-Field MIMO Communications

Номер: US20130101005A1

Автор: Aryanfar Farshid

Принадлежит: RAMBUS INC.

A near-field communication (NFC) system supports increased data rates using a multiple-input-multiple-output (MIMO) interface. Multiple receive antennas are positioned within the near field of multiple transmit antennas. The NFC system uses a combination of antenna spacing and polarizations to reduce correlation between channels, and thus improves performance by creating closer to ideal MIMO operation. Such system can also be operated as parallel SISO links with reduced cross-channel interference resulting in low power consumption. 1. A communication system comprising: a data mapping unit to divide a data signal into parallel data streams;', 'a plurality of transmitters connected to the data mapping unit, each transmitter tuned to a center frequency f and wavelength λ, each transmitter to transmit a respective data stream as a respective modulated signal; and', {'sub': 'i', 'a plurality of transmit antennas, each of a largest dimension Dand connected to one or more respective transmitters to transmit the respective modulated signal, the transmit antennas collectively transmitting the modulated signals of the wavelength λ;'}, {'sub': 'i', 'wherein a greatest of dimensions Dis a maximum dimension D; and'}], 'a transmitter circuit comprising{'sup': '2', 'a receiver circuit comprising a plurality of receive antennas, the receive antennas to receive the signals, wherein each receive antenna is spaced from a closest one of the transmit antennas by a distance less than the greater of 2D/λ and λ/2π.'}2. The system of claim 1 , wherein the transmit antennas are oriented to transmit the modulated signals at respective polarizations.3. The system of claim 2 , wherein the receive antennas are oriented to receive the modulated signals at the respective polarizations.4. The system of claim 1 , wherein the receiver circuit further comprises:a plurality of receivers, each receiver tuned to the center frequency f and wavelength λ, each receiver connected to one or more respective ...

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Номер записи: 89

25-04-2013 дата публикации

Systems and methods for downlink scheduling in multiple input multiple output wireless communications systems

Номер: US20130101008A1

Автор: Ahmed Farhan Hanif, ChingYao Huang, Li-Chuan Tseng

Принадлежит: Transpacific IP Ltd

Systems and methods for downlink scheduling in wireless communications systems are described. In some embodiments, a method includes: applying channel prediction at a transmitter for transmitting information to one or more mobile devices; predicting channel state information for a channel over which the information is transmitted, the channel state information being based, at least, on the channel prediction; determining a precoding matrix to apply to the information, the determining the precoding matrix being based, at least, on predicted channel state information; and scheduling transmission of the information to the one or more mobile devices based, at least, on an asymptotic ergodic rate for the one or more mobile devices. The asymptotic ergodic rate can be based on large-scale channel behavior and a maximum Doppler shift between the mobile devices.

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Номер записи: 90

25-04-2013 дата публикации

Data stream processing method, device, and system

Номер: US20130101009A1

Автор: Huang Huang, Kin Nang Lau, Yinggang Du

Принадлежит: Huawei Technologies Co Ltd

The present invention provides a data stream processing method, device, and system. The data stream processing method includes: using a precoding parameter to perform precoding processing on an l th to-be-sent data stream of a current k th transmitting device, where the l th to-be-sent data stream includes a lattice point data stream mapped to a lattice grid; and sending the precoded l th to-be-sent data stream to a k th receiving device, where both l and k are positive integers. The technical solutions in the embodiments of the present invention can be helpful for filtering out interference, exactly complies with an actual processing procedure of an interfering data stream, and have strong practicability.

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Номер записи: 91

25-04-2013 дата публикации

Interference Cancelling Block Modulation

Номер: US20130101062A1

Автор: Ayyar Arun Balavenkatasubramanian, Bhaskar Ramamurthi, Ganesh Venkatraman, Krishnamurthy Giridhar, Kuchi Kiran Kumar, S. Devar Sendilramkumar, Vinoth Nagarajan

Принадлежит: Centre of Excellence In Wireless Tech

Embodiments herein disclose an Interference Cancelling Block Modulation (ICBM), a new open-loop precoding scheme where each transmitter is assigned with a predetermined precoder which facilitates interference cancellation at the receivers. Only a finite set of precoders will be used, and they will be assigned to each transmitter in a pre-determined manner. Usually, interfering transmitters located adjacent to each other will have different precoders, and the same precoder can be reused by non-adjacent transmitters. The precoders are represented by N×K matrices and they expand the symbols in time and/or frequency by a factor of N/K while providing precoded sequences with low cross-correlation properties.

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Номер записи: 92

02-05-2013 дата публикации

METHOD, TERMINAL, AND BASE STATION FOR TRANSMITTING AND RECEIVING CHANNEL INFORMATION

Номер: US20130107849A1

Автор: Park Kyoungmin

Принадлежит: Pantech Co., Ltd.

A wireless communication system uses multiple-input multiple-output (MIMO) antennas for both transmitting and receiving ends. The features are characterized by a step for receiving feedback from at least one terminal at a base station on a first channel state information and a second channel state information at intervals different from each other; and a step for receiving feedback, when the terminal and at least one other terminal are simultaneously allowed to connect, on multiple-access information on the other terminal from among the first channel state information and the second channel state information which has the shorter interval but which is longer than one interval. 1. A method for receiving channel information by a base station , the method comprising:receiving, as feedback, first channel state information and second channel state information from at least one user equipment during different cycles; andreceiving, as feedback, multiple access information of at least one user equipment different from the user equipment during a cycle longer than a shorter cycle among a cycle of the first channel state information and a cycle of the second channel state information, when simultaneous access of the user equipment and the different user equipment is allowed.2. The method as claimed in claim 1 , wherein the first channel state information corresponds to a first index of a precoding matrix of the user equipment having a short feedback cycle claim 1 , the second channel state information corresponds to a second index of a precoding matrix of the user equipment having a long feedback cycle claim 1 , and the multiple access information corresponds to a third index of a precoding matrix of the different user equipment.3. The method as claimed in claim 1 , wherein one of the first channel state information and the second channel state information is received as feedback during a cycle identical to a cycle claim 1 , during which the multiple access information is ...

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Номер записи: 93

02-05-2013 дата публикации

Pilot Scheme for a MIMO Communication System

Номер: US20130107857A1

Автор: HUA Xu, Jianglei Ma, Ming Jia, Moussa Abdi, Peiying Zhu, Wen Tong

Принадлежит: Apple Inc

The present invention employs a pilot scheme for frequency division multiple access (FDM) communication systems, such as single carrier FDM communication systems. A given transmit time interval will include numerous traffic symbols and two or more short pilot symbols, which are spaced apart from one another by at least one traffic symbol and will have a Fourier transform length that is less than the Fourier transform length of any given traffic symbol. Multiple transmitters will generate pilot information and modulate the pilot information onto sub-carriers of the short pilot symbols in an orthogonal manner. Each transmitter may use different sub-carriers within the time and frequency domain, which is encompassed by the short pilot symbols within the transmit time interval. Alternatively, each transmitter may uniquely encode the pilot information using a unique code division multiplexed code and modulate the encoded pilot information onto common sub-carriers of the short pilot symbols.

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Номер записи: 94

02-05-2013 дата публикации

MULTI-RESOLUTION BEAMFORMING BASED ON CODEBOOKS IN MIMO SYSTEMS

Номер: US20130107977A1

Автор: Lakkis Ismail

Принадлежит: QUALCOMM INCORPORATED

Certain aspects of the present disclosure relate to methods for beamforming that achieve beamforming optimality criterions. Some proposed beamforming techniques are based on antenna directions with multiple resolutions. 1. (canceled)3. The method of claim 2 , wherein the first preferred vector of weights from the first subset of the first set of codebooks and the second preferred vector of weights from the second subset of the first set of codebooks are determined based on a signal-quality metric.4. The method of claim 3 , wherein the signal-quality metric comprises an effective signal-to-noise ratio (ESNR).5. The method of claim 1 , wherein at least a part of each training signal is based on Golay sequences.7. The apparatus of claim 6 , wherein the first preferred vector of weights from the first subset of the first set of codebooks and the second preferred vector of weights from the second subset of the first set of codebooks are determined based on a signal-quality metric.8. The apparatus of claim 6 , wherein the signal-quality metric comprises an effective signal-to-noise ratio (ESNR).9. The apparatus of claim 5 , wherein at least a part of each training signal is based on Golay sequences.11. The apparatus of claim 10 , wherein the first preferred vector of weights from the first subset of the first set of codebooks and the second preferred vector of weights from the second subset of the first set of codebooks are determined based on a signal-quality metric.12. The apparatus of claim 11 , wherein the signal-quality metric comprises an effective signal-to-noise ratio (ESNR).13. The apparatus of claim 9 , wherein at least a part of each training signal is based on Golay sequences. This application is a Continuation of U.S. patent application Ser. No. 12/405,020 entitled “MULTI-RESOLUTION BEAMFORMING BASED ON CODEBOOKS IN MIMO SYSTEMS,” filed Mar. 16, 2009, which claims benefit of U.S. Provisional Patent Application Ser. No. 61/037,139, having Attorney Docket No. ...

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Номер записи: 95

02-05-2013 дата публикации

ANTENNA SYSTEM OPTIMIZED FOR SISO AND MIMO OPERATION

Номер: US20130109449A1

Автор: Desclos Laurent, Rowson Sebastian, Shamblin Jeffrey

Принадлежит: ETHERTRONICS, INC.

An active antenna system and algorithm is described that provides for improved performance from LTE communication systems operating in Category 1 mode, where one antenna is used. For the LTE SISO case (category 1), a modal antenna capable of generating multiple radiation patterns will provide improved throughput due to improved resistance to fading. Modal (Null Steering) antenna technology is implemented in a multi-antenna system to provide for single and multiple antenna operation wherein one or more antennas have two or more radiation modes. An algorithm has been developed that determines when to switch from SISO to MIMO operation. 1. An antenna system , comprising:a first modal antenna adapted for operation at a plurality of antenna modes, each of said antenna modes having a distinct antenna radiation pattern;a second modal antenna adapted for operation at a plurality of antenna modes, each of said antenna modes having a distinct antenna radiation pattern;a processor coupled to the first and second modal antennas and adapted to execute an algorithm configured to select one of the first and second modal antennas and a mode thereof for providing an optimum Channel Quality Indicator (CQI);wherein the algorithm initiates a decision process adapted to determine if throughput of a single antenna of the first and second modal antennas meets pre-determined requirements;wherein operation of said single antenna of the modal antennas is maintained if the pre-determined requirements are met; andwherein both the first and second modal antennas are enabled if throughput does not meet the pre-determined requirements, resulting in operation of said first and second antennas in a two-antenna MIMO system.2. The antenna system of claim 1 , wherein said pre-determined requirements comprise requirements for Category 1 LTE operation.3. The antenna system of claim 1 , wherein three or more antennas are combined to form an “m” element MIMO antenna system claim 1 , where “m” is equal to ...

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Номер записи: 96

09-05-2013 дата публикации

Almost-Blank Subframe Configuration Detection in Heterogeneous Networks

Номер: US20130114435A1

Автор: Fredrik Nordström, Jianfeng Wang, Matthias Kamuf, Shaohua Li

Принадлежит: Telefonaktiebolaget LM Ericsson AB

A method for detecting an Almost-Blank Subframe (ABS) configuration for an interfering macro cell of a heterogeneous network is implemented in a wireless terminal. For one or more resource blocks in a received signal, a first power metric is calculated as a function of channel response estimates determined for predicted cell-specific (or common) reference signal (CRS) resource element locations in a plurality of symbols. For the one or more resource blocks in the received signal, a second power metric is calculated as a function of channel response estimates determined for the predicted CRS resource element locations in a single one of the plurality of symbols. A difference between the first and second power metrics is compared to a threshold, and responsive to the comparison a determination is made as to whether the macro cell is operating in a Multicast and Broadcast Single Frequency Network (MBSFN) mode or a non-MBSFN mode.

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Номер записи: 97

09-05-2013 дата публикации

Transmitter apparatus, receiver apparatus, transmission method, and notification method

Номер: US20130114564A1

Автор: Akihiko Nishio, Ayako Horiuchi, Masayuki Hoshino, Seigo Nakao, Yoshihiko Ogawa

Принадлежит: Panasonic Corp

This invention relates to a transmitter apparatus, a receiver apparatus, a transmission method and a notification method that, when a switching between MIMO communication and non-MIMO communication is performed, can suppress the increase of an SRS (Sounding Reference Signal) resource, while suppressing the degradation of trackability of temporal variation of a channel. In a terminal ( 200 ), a mapping unit ( 212 ) maps an SRS sequence, which is received from a pilot, generating unit ( 216 ), on the basis of information related to an SRS hopping pattern, received from a base station ( 100 ). For this SRS hopping pattern, the frequency of the SRS transmissions via a first one of a plurality of antennas of the terminal ( 200 ) is higher than that of the SRS transmissions via a second one of the plurality of antennas of the terminal ( 200 ).

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Номер записи: 98

09-05-2013 дата публикации

TRANSMISSION METHOD AND APPARATUS FOR CARRIER AGGREGATION AND UPLINK MIMO

Номер: US20130114578A1

Автор: JUNG Manyoung, Lee SangWook, LIM Suhwan, YANG Yoonoh

Принадлежит: LG ELECTRONICS INC.

A transmission method for carrier aggregation, more particularly, for uplink MIMO and carrier aggregation, in a method for transmitting an uplink signal by the carrier aggregation in a terminal having at least four antennas, includes receiving a grant signal for transmission of the uplink signal, the grant signal including information related to use of a primary cell and a secondary cell, determining one antenna or at least two antennas to use the primary cell, determining one antenna or at least two antennas to use the secondary cell, and transmitting a first uplink signal to the primary cell and a second uplink signal to the secondary cell using the respective determined antennas. 1. A transmission method for uplink Multi-Input Multi-Output (MIMO) and Carrier Aggregation (CA) , in a method for transmitting an uplink signal by CA in a terminal having at least four antennas , the method comprising:receiving a grant signal for transmission of an uplink signal, the grant signal including information related to use of a primary cell and a secondary cell;determining one antenna or at least two antennas to use the primary cell;determining one antenna or at least two antennas to use the secondary cell; andtransmitting a first uplink signal to the primary cell and a second uplink signal to the secondary cell using the determined respective antennas,wherein the antenna to use the primary cell does not overlap the antenna to use the secondary cell,wherein when at least two antennas are to use the primary cell, the at least two antennas are not adjacent to each other,wherein when two antennas are to use the secondary cell, the at least two antennas are not adjacent to each other.2. The method of claim 1 , wherein the transmission of the first uplink signal to the primary cell and the second uplink signal to the secondary cell using the determined respective antennas are an inter-band or intraband transmission.3. A transmission method for uplink Multi-Input Multi-Output (MIMO) ...

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Номер записи: 99

09-05-2013 дата публикации

Beamforming coordination in heterogeneous networks

Номер: US20130115985A1

Автор: Alexander Maltsev, Alexei Davydov, Andrey Pudeyev, Gregory V. Morozov

Принадлежит: Intel Corp

Technology for spatial domain beamforming coordination at a low power node (LPN) in a heterogeneous network (HetNet) is disclosed. One method can include the LPN collecting spatial feedback information of macro node interference from a plurality of wireless devices in a LPN cell. The LPN can compile the spatial feedback information into a spatial feedback report. The LPN can send the spatial feedback report from the LPN to a macro node for calculating a beamforming vector to reduce the macro node interference for the plurality of wireless devices in the LPN cell.

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Номер записи: 100