Настройки

Укажите год
-

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

Подробнее
-

Мониторинг СМИ

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

Подробнее

Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
Ведите корректный номера.
Ведите корректный номера.
Ведите корректный номера.
Ведите корректный номера.
Укажите год
Укажите год
Применить Всего найдено 9089. Отображено 100.
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.

Подробнее
Номер записи: 1
26-01-2012 дата публикации

Distortion cancellation in radio receivers using I/Q correction

Номер: US20120020389A1
Автор: Hooman Darabi, Mohyee Mikhemar
Принадлежит: Broadcom Corp

A technique to remove second order and third order nonlinearity distortions caused by a blocker signal at an input of a radio receiver. An envelope detector is utilized at an input of the RF front-end of the receiver to obtain a magnitude of the overall signal. The output of the envelope detector is then processed at baseband to estimate coefficients that relate to the distortion. Once the coefficients are obtained, the coefficients are applied at an I/Q imbalance correction stage to also correct for the distortion by cancelling the distortion from the received signal.

Подробнее
Номер записи: 2
16-02-2012 дата публикации

Daisy-Chained Ring of Remote Units For A Distributed Antenna System

Номер: US20120039254A1
Автор: Bin Lin, Paul Lemson, Shawn Patrick Stapleton
Принадлежит: Dali Systems Co Ltd

The present disclosure is a novel utility of a software defined radio (SDR) based Distributed Antenna System (DAS) that is field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. More specifically, the present invention relates to a DAS utilizing one or more Daisy-Chained Rings of Remote Units. The present invention enables a high degree of flexibility to manage, control, enhance, facilitate the usage and performance of a distributed wireless network such as Flexible Simulcast, automatic traffic load-balancing, network and radio resource optimization, network calibration, autonomous/assisted commissioning, carrier pooling, automatic frequency selection, frequency carrier placement, traffic monitoring, traffic tagging, pilot beacon, etc. As a result, a DAS in accordance with the present invention can increase the efficiency and traffic capacity of the operators' wireless network.

Подробнее
Номер записи: 3
01-03-2012 дата публикации

Symmetrical data signal processing

Номер: US20120051412A1
Автор: Haosong Fu, HONG Liu, Raúl A. Casas
Принадлежит: ATI TECHNOLOGIES ULC

A digital communications receiver includes an input configured to receive, via a communications channel, a received first signal representing a sequence of symbols, each symbol being encoded to be representative of a plurality of data bits. A processor adjusts a magnitude and filters the received signal. An equalizer applies a cyclic prefix restoration to the adjusted and filtered signal, producing a second signal, converts the second signal from time domain to frequency domain to produce a frequency domain signal, and determines a first quantity of values representing a first portion of the symbols by evaluating a relationship of channel values representing characteristics of the communications channel and a second quantity of values representing a portion of the frequency domain signal, the first quantity being smaller than the second quantity.

Подробнее
Номер записи: 4
01-03-2012 дата публикации

Hybrid equalization system

Номер: US20120051418A1
Автор: Fang-Ming Yang
Принадлежит: Sunplus Technology Co Ltd

A hybrid equalization system includes an equalization device, a target channel impulse response device, a maximum likelihood sequence estimation device and a multiplexer. The equalization device receives a sampled baseband signal and performs an equalization operation thereon for generating first estimated symbols. The target channel impulse response device convolutes the first estimated symbol and a predetermined target channel response function for generating a training symbol corresponding to a target channel. The maximum likelihood sequence estimation device performs a maximum likelihood sequence estimation on the sampled baseband signal trained by first estimated symbols based on the target channel impulse response for generating second estimated symbols. The multiplexer selects the first estimated symbol or the second estimated symbol as an output of the hybrid equalization system according to a selection signal.

Подробнее
Номер записи: 5
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.

Подробнее
Номер записи: 6
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.

Подробнее
Номер записи: 7
12-04-2012 дата публикации

Systems and Methods that Provide Frequency Domain Supplemental Training of the Time Domain Equalizer for DMT

Номер: US20120087399A1
Автор: Arnon Friedmann, Bindu Chandna, Jelena Jovin, Stuart D. Sandberg
Принадлежит: Aware Inc

Using a known or later developed time domain equalizer coefficient training algorithm, a least square solution for the time domain equalizer coefficients is taken at a starting point and iteratively improved on. In particular, the improvement is directed towards maximizing number of bits per frame loaded over the time domain equalizer coefficient choice. This can be accomplished by maximizing capacity directly rather than setting a goal to shorten the channel and hoping that the capacity will be maximized as a result.

Подробнее
Номер записи: 8
19-04-2012 дата публикации

Method and Apparatus for Interference Suppression using a Reduced-Complexity Joint Detection

Номер: US20120093263A1
Автор: Anders Rosenqvist, Bo Bernhardsson, Niklas Andgart
Принадлежит: Individual

A method of detecting a desired signal within a composite signal provides for suppression of interfering signal(s). The method, implemented in a wireless communication apparatus, for example, includes receiving the composite signal and obtaining sample values therefrom. At least some of the sample values include desired and interfering signal components. The method further includes generating an interfering signal channel estimate by: forming sample pairs for some or all of the sample values; identifying sample pairs of interest as those sample pairs in which the interfering signal component is the same; and calculating the interfering signal channel estimate as an average value determined from one or more of the sample pairs of interest. The method further includes detecting desired signal symbols from the composite signal in a joint detection process that functionally depends on the interfering signal channel estimate.

Подробнее
Номер записи: 9
24-05-2012 дата публикации

Method and system for providing beamforming feedback in wireless communication systems

Номер: US20120127899A1
Автор: ARNAUD Meylan, John W. Ketchum, Sanjiv Nanda, Shravan K. Surineni
Принадлежит: Qualcomm Inc

Techniques to support beamforming for stations in a wireless network are described. A station may support beamforming with implicit or explicit feedback by having capabilities to transmit and receive sounding frames, responding to training request by sending a sounding frame, and responding to request for explicit feedback. In one explicit beamforming embodiment, the station may send a first frame with an explicit feedback request and may also send a Null Data Packet (NDP) having at least one training field but no data field. The station may receive a second frame with explicit feedback, which may be derived based on the NDP. The station may derive steering information based on explicit feedback and may then send a steered frame with beamforming based on the steering information. Other aspects, embodiments, and features are also claimed and described.

Подробнее
Номер записи: 10
07-06-2012 дата публикации

Adjustable Latency Transceiver Processing

Номер: US20120140797A1
Автор: Frank Mccarthy, Jose Tellado, Moshe Malkin
Принадлежит: PLX Technology Inc

Embodiments of methods, apparatuses and systems for transceiver processing are disclosed. One method includes a transceiver receiving a data stream from a link partner transceiver. A link parameter of a link between the transceiver and the link partner transceiver is determined. Allocation of transceiver processing between high-latency processing and low-latency processing is based at least in part on the link parameter.

Подробнее
Номер записи: 11
21-06-2012 дата публикации

Communication system, mobile station apparatus, and base station apparatus

Номер: US20120157101A1
Автор: Daiichiro Nakashima, Katsunari Uemura, Shohei Yamada
Принадлежит: Sharp Corp

In a communication system in which a mobile station apparatus is connected to a base station apparatus simultaneously using a plurality of frequency bands, an event is efficiently determined concerning measurement of reception qualities of the frequency bands. The mobile station apparatus includes: a reception unit that receives from the base station apparatus an event condition for measuring a reception quality of at least one carrier component defined in the frequency bands different from each other and a parameter used for determining whether or not the event condition is satisfied; a measurement processing unit that measures the reception quality of the at least one carrier component; a cell determination unit that determines whether to adjust the received parameter; and an event determination unit that sets the event condition based on the received parameter or the adjusted parameter and that determines whether or not the set event condition is satisfied.

Подробнее
Номер записи: 12
19-07-2012 дата публикации

Lattice reduction architecture and method and detection system thereof

Номер: US20120183088A1
Автор: Chun-Fu Liao, Fang-Chun Lan, Po-Lin Chiu, Yuan-Hao Huang
Принадлежит: Industrial Technology Research Institute ITRI

A lattice reduction architecture, a lattice reduction method and a detection system thereof are proposed. The proposed architecture performs lattice reduction on channel matrices corresponding to sub-carriers and includes G processing group blocks, which receives channel matrices corresponding to the sub-carriers, and each of the first to the G-1th processing group blocks includes k processing modules respectively processing k sub-carriers, and the Gth processing group block includes j processing modules, where j<=k. In each one of the processing group blocks, at least one processing module receives an initial matrix, where the processing module includes a lattice reduction processing unit provides a reduction matrix to at least one neighboring processing module when a lattice reduction algorithm is processed on a channel matrix corresponding to its respective sub-carrier for at least iteration loops according to the channel matrix and the received initial matrix.

Подробнее
Номер записи: 13
09-08-2012 дата публикации

METHOD AND APPARATUS FOR SENDING AND RECEIVING CHANNEL QUALITY INDICATORS (CQIs)

Номер: US20120201166A1
Автор: Christopher R. Cave, Paul Marinier, Rocco DiGirolamo, Sudheer A. Grandhi, Vincent Roy
Принадлежит: InterDigital Technology Corp

A method and apparatus for sending and receiving channel quality indicators (CQIs) is disclosed. A CQI may be sent or received periodically. A CQI may also be sent or received upon request by a network.

Подробнее
Номер записи: 14
16-08-2012 дата публикации

High-performance cellular telephone receiver

Номер: US20120208567A1
Автор: David K. Mesecher
Принадлежит: Northrop Grumman Systems Corp

A method includes: receiving a reference signal on an array of antenna elements; using a received reference signal to find optimal weighting of the antenna elements to point a beam pattern of the antenna elements in the direction of a reference signal, thereby providing gain in the direction of the reference signal and attenuation in all other directions; adjusting a width of the beam pattern to cover an area of interest; acquiring and tracking interferers in the area of interest; reconstructing a component of interference from each of the interferers; and using the reconstructed component of interference to adaptively cancel interference from the interferers.

Подробнее
Номер записи: 15
13-09-2012 дата публикации

Systems and methods for providing integrated financial calculations and action plans

Номер: US20120230382A1
Автор: Shawn Patrick Stapleton, Wan Jong Kim
Принадлежит: Dali Systems Co Ltd

A baseband-derived RF predistortion system using a lookup table having coefficients extracted at baseband and then applied at RF by means of a vector modulator. The architecture combines the narrowband advantage of envelope predistortion with the accuracy of baseband predistortion, and including compensation for memory effects. A polynomial-based alternative is also described.

Подробнее
Номер записи: 16
13-09-2012 дата публикации

Receiver training with cycle slip detection and correction

Номер: US20120230454A1
Автор: Amaresh Malipatil, Mark Trafford, Mohammad Mobin, Vladimir Sindalovsky, Ye Liu
Принадлежит: LSI Corp

In described embodiments, a transceiver includes a clock and data recovery module (CDR) with an eye monitor and a cycle slip monitor. The cycle slip detector monitors a CDR lock condition, which might be through detection of slips in sampling and/or transition timing detection. The cycle slip detector provides a check point to sense system divergence, allowing for a mechanism to recover CDR lock. In addition, when the CDR is out-of-lock, the various parameters that are adaptively set (e.g., equalizer parameters) might be invalid during system divergence. Consequently, these parameters might be declared invalid by the system and not used.

Подробнее
Номер записи: 17
11-10-2012 дата публикации

Method for feeding back channel state information, and method and device for obtaining channel state information

Номер: US20120257579A1
Автор: BIN Li, Hui Shen, Xiaodong Wang, YI LUO
Принадлежит: Huawei Technologies Co Ltd

Embodiments of the present invention provide a method for feeding back channel state information, and a method and a device for obtaining channel state information. The method for feeding back the channel state information includes: compressing, by a user equipment, original time domain channel state information to obtain compressed time domain Channel state information: quantizing the compressed time domain channel state information to obtain a codebook index; and sending the codebook index to a base station. With the technical solutions provided by the embodiments of the present invention, the total overhead used for feeding back the channel state information from the user equipment to the base station is reduced.

Подробнее
Номер записи: 18
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.

Подробнее
Номер записи: 19
18-10-2012 дата публикации

Nonlinear compensation using an enhanced backpropagation method with subbanding

Номер: US20120263481A1
Автор: Ezra Ip, Neng Bai
Принадлежит: NEC Laboratories America Inc

Systems and methods are disclosed to perform nonlinear compensation (NLC) in an optical communication system by applying digital backpropagation (DBP) using a frequency-shaped split-step Fourier method (FS-SSFM), and processing a data block using an overlap-and-save method with a block size M and an overlap factor of N samples between adjacent blocks.

Подробнее
Номер записи: 20
25-10-2012 дата публикации

Out-of-band emission cancellation

Номер: US20120269286A1
Автор: Xiaojing Huang, Yingjie Jay Guo
Принадлежит: Commonwealth Scientific and Industrial Research Organization CSIRO

A transmission signal pre-processing method and apparatus for out-of-band emission cancellation are disclosed. For each of N subchannels in a band weighting each of N subchannel symbols by a calculated value in the range from 0 to 1 is performed. Precoding said N weighted symbols, organised as an N×1 matrix, by multiplication by a unitary matrix is then performed.

Подробнее
Номер записи: 21
15-11-2012 дата публикации

Increased capacity communications for ofdm-based wireless communications systems/methods/devices

Номер: US20120288023A1
Автор: Peter D. Karabinis
Принадлежит: EICES Res Inc

Numerous embodiments are provided that may be used to provide enhanced capacity and/or Quality-of-Service for OFDM-based systems such as LTE and/or WiMAX. Various service/device modes and/or applications are also provided. According to embodiments of the invention, a transformation may be performed on a data vector by a transmitter, prior to the transmitter transmitting the data vector, to distribute elements of the data vector over an available frequency space, thus providing robustness to channel anomalies such as fading and/or interference. Embodiments relating to architectures, systems, methods, devices, software, firmware and/or computer program products are provided.

Подробнее
Номер записи: 22
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 ).

Подробнее
Номер записи: 23
13-12-2012 дата публикации

Equalizer with Controllably Weighted Parallel High Pass and Low Pass Filters and Receiver Including Such an Equalizer

Номер: US20120314753A1
Автор: Dongyun Lee
Принадлежит: Silicon Image Inc

An adjustable equalizer that includes a first branch including a low pass filter (LPF) typically having a variable gain (β), and a second branch including a high pass filter (HPF) typically having another variable gain (α). Outputs of the branches in response to an input signal are summed to produce an equalized output. The equalizer can be implemented using CMOS technology and can be capable of equalizing an input indicative of data having a maximum data rate of at least 1 Gb/s. Typically, the equalizer is embodied in a receiver for use in equalizing a signal, indicative of video or other data, that has propagated over a serial link to the receiver.

Подробнее
Номер записи: 24
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.

Подробнее
Номер записи: 25
03-01-2013 дата публикации

Methods and systems for optimal zero-forcing and mmse frequency domain equalizers for complex and vsb signals

Номер: US20130003817A1
Автор: Fuyun Ling, Wanlun Zhao
Принадлежит: Qualcomm Inc

An improved receiver apparatus and algorithm for equalizing signals in a receiver device may equalize a block of data generated from N data symbols in a single carrier communication system. A first algorithm may be applied to a plurality of signal samples to generate a frequency domain representation of the samples. A channel estimate may be generated and a frequency response of a zero-forcing or a minimum-mean-square equalizer is applied. A conjugate of the computed frequency response is multiplied with a frequency domain representation for each sample to generate a product value. N-aliased frequency domain values from the generated product value may be determined for each of the samples. A second algorithm is applied to the generated N-aliased frequency domain values to generate estimates of the transmitted time domain data symbols.

Подробнее
Номер записи: 26
24-01-2013 дата публикации

Adaptive equalizer and operating method thereof

Номер: US20130022098A1
Автор: Da-Rong Huang, Min-Chung Chou
Принадлежит: Raydium Semiconductor Corp

An adaptive equalizer and operating method thereof are disclosed. The adaptive equalizer is oversampling-based. The adaptive equalizer includes a searching module, a compensation module, and an operating module. The searching module searches the equalizer setting from a lower compensation to a higher compensation to obtain a first equalizer setup value according a first monitored result of a monitor and then searches the equalizer setting from a higher compensation to a lower compensation to obtain a second equalizer setup value according to a second monitored result of the monitor. The operating module performs an operation on the first equalizer setup value and the second equalizer setup value to obtain an optimized equalizer setup value.

Подробнее
Номер записи: 27
31-01-2013 дата публикации

Method for scheduling users in a mobile or wireless communication system, corresponding mobile terminal and base station

Номер: US20130028215A1
Автор: Christian Gerlach, Thorsten Wild
Принадлежит: Alcatel Lucent SAS

The present invention relates to a method for scheduling users in a mobile or wireless radio communication system comprising a base station with a multiple antenna system and at least two users, said base station communicating with users using precoding weights at said multiple antenna system, an indication on precoding weights to be used for communication with a first user being sent by said first user on a feedback channel to said base station. According to the present invention, the method comprises the steps of: •Expressing said precoding weights used at said multiple antenna system as a combination of two types of precoding weights, a first type of precoding weights relating to long term channel information and a second type of precoding weights relating to short term channel changes; •Sending on said feedback channel from said first user an indication related to precoding weights of said first type which, if used at said multiple antenna system for communication with a second user, would cause interference below a threshold on said first user if both said first and second users were scheduled on identical resources.

Подробнее
Номер записи: 28
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.

Подробнее
Номер записи: 29
14-03-2013 дата публикации

Method for channel estimation, related channel estimator, receiver, and computer program product

Номер: US20130064313A1
Автор: Alessandro Tomasoni, Devis Gatti, Sandro Bellini
Принадлежит: Politecnico di Milano, STMICROELECTRONICS SRL

An embodiment of a method for channel estimation for an Orthogonal Frequency Division Multiplexing communication system, including estimating a Time Domain Least Squares channel impulse response having a given maximum number of L taps based on a channel covariance matrix Q, and for each tap l=1, . . . , L a respective channel impulse response in the time-domain ĥ l , wherein the channel impulse responses in the time-domain are grouped as a channel impulse response vector in the time domain ĥ. Specifically, an updated channel-impulse-response vector in the time domain {tilde over (h)} is determined by computing for each tap l the solution of the following system: Q 1:l, 1:l {tilde over (h)} l×1 =ĥ 1:l , wherein the updated channel-impulse-response vector in the time domain {tilde over (h)} is computed recursively via a Levinson Durbin algorithm.

Подробнее
Номер записи: 30
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.

Подробнее
Номер записи: 31
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.

Подробнее
Номер записи: 32
11-04-2013 дата публикации

Method of determining precoding matrix and corresponding communication methods and devices

Номер: US20130089165A1
Автор: Di LV, Hongwei Yang, Jinhui Chen, Lu Wu, Yang Song
Принадлежит: Alcatel Lucent SAS

In order to improve the performance of the precoding scheme for closely-spaced cross-polarized CLA antennas, the invention proposes a new precoding codebook and precoding matrix. The invention also proposes a method for determining precoding matrix based on the new precoding codebook, and corresponding method and device for communicating by using this precoding matrix. The precoding codebook and matrix proposed in the invention has better performance.

Подробнее
Номер записи: 33
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.

Подробнее
Номер записи: 34
06-06-2013 дата публикации

Pattern detector for serializer-deserializer adaptation

Номер: US20130142245A1
Автор: Amaresh V. Malipatil, Lane A. Smith, Mohammed S. Mobin, Pervez M. Aziz, Vladimir Sindalovsky
Принадлежит: LSI Corp

In described embodiments, a Serializer-Deserializer (SerDes) receiver includes a pattern detector that allows for detection of insufficiently randomized pattern periods and low activity periods. A freeze of equalization adaptation during these periods might occur by embedding disqualifying patterns into adaptation data. Some embodiments also allow for detection of long intervals of freeze, and so delay a freeze de-assertion in order for a clock and data recovery (CDR) circuit of the receiver to regain lock to the serial data. Embedding freeze information in the receive data allows for precise synchronization of receive data and freeze.

Подробнее
Номер записи: 35
27-06-2013 дата публикации

High-Speed Serial Data Transceiver and Related Methods

Номер: US20130163701A1
Автор: Aaron W. Buchwald, Avanindra Madisetti, Howard A. Baumer, HUI Wang, Josephus van Engelen, Michael Le, Xicheng Jiang
Принадлежит: Broadcom Corp

A high-speed serial data transceiver includes multiple receivers and transmitters for receiving and transmitting multiple analog, serial data signals at multi-gigabit-per-second data rates. Each receiver includes a timing recovery system for tracking a phase and a frequency of the serial data signal associated with the receiver. The timing recovery system includes a phase interpolator responsive to phase control signals and a set of reference signals having different predetermined phases. The phase interpolator derives a sampling signal, having an interpolated phase, to sample the serial data signal. The timing recovery system in each receiver independently phase-aligns and frequency synchronizes the sampling signal to the serial data signal associated with the receiver. A receiver can include multiple paths for sampling a received, serial data signal in accordance with multiple time-staggered sampling signals, each having an interpolated phase.

Подробнее
Номер записи: 36
11-07-2013 дата публикации

Multiple-Input Multiple-Output System And Method

Номер: US20130177095A1
Автор: Ardavan Maleki Tehrani, Jeffrey M. Gilbert, Qinfang Sun, Won-Joon Choi
Принадлежит: Qualcomm Inc

A multiple-input multiple-output (MIMO) system can transmit on multiple antennas simultaneously and receive on multiple antennas simultaneously. Unfortunately, because a legacy 802.11a/g device is not able to decode multiple data streams, such a legacy device may “stomp” on a MIMO packet by transmitting before the transmission of the MIMO packet is complete. Therefore, MIMO systems and methods are provided herein to allow legacy devices to decode the length of a MIMO packet and to restrain from transmitting during that period. These MIMO systems and methods are optimized for efficient transmission of MIMO packets.

Подробнее
Номер записи: 37
08-08-2013 дата публикации

System and Method for Polarization De-Multiplexing in a Coherent Optical Receiver

Номер: US20130202021A1
Автор: Hongbin Zhang, Oleg Sinkin
Принадлежит: TYCO ELECTRONICS SUBSEA COMMUNICATIONS LLC

A system and method for polarization de-multiplexing in a coherent optical receiver. De-multiplexing is achieved using a modified constant modulus algorithm (CMA) wherein filter coefficients are determined as a function of a coupling coefficient to avoid convergence of the CMA outputs.

Подробнее
Номер записи: 38
15-08-2013 дата публикации

Transmitter and receiver for frequency domain equalization

Номер: US20130208781A1
Автор: Chang Yong Shin, Dong Sik Kim, Gi Hong IM, Ui Kun Kwon
Принадлежит: Academy Industry Foundation of POSTECH, SAMSUNG ELECTRONICS CO LTD

A transmitter and/or receiver for performing frequency domain equalization is provided. A transmitter includes a pilot position determination unit for determining positions for inserting pilots in a frequency domain based on frequency spectrums of data, and a pilot insertion unit for inserting the pilots between the frequency spectrums of the data according to the determined positions for inserting the pilots.

Подробнее
Номер записи: 39
05-09-2013 дата публикации

Self-calibrating continuous-time equalization

Номер: US20130230089A1
Автор: Timothy Hollis
Принадлежит: Micron Technology Inc

Embodiments of the invention comprise a continuous-time equalizer for reducing ISI in data received from a communication channel, and methods and circuitry for tuning or calibrating that equalizer. Selected coefficients for a transfer function of the equalizer circuit are fixed, while other coefficients are tuned by an adaptive algorithm. The adaptive algorithm minimizes errors associated with the tunable coefficients based on one or more training signals sent by the transmitter and received by the equalizer circuit at the receiver. The training signals allow for a variety of error terms to be calculated, from which the tunable coefficients are updated so as to iteratively minimize the error terms and simultaneously tune the equalizer to more accurately compensate for the degrading effects of the channel.

Подробнее
Номер записи: 40
05-09-2013 дата публикации

Extension of ethernet phy to channels with bridged tap wires

Номер: US20130230091A1
Автор: Ahmad Chini, Mehmet Tazebay, Scott Powell
Принадлежит: Broadcom Corp

In one embodiment, receiving an Ethernet signal over a channel, the Ethernet signal comprising a preamble frame, an idle frame, and a data frame, the preamble frame comprising one or more preamble codes; synchronizing to the Ethernet signal based on the preamble frame; replicating the one or more preamble codes; and training a decision feedback equalizer (DFE) based on the one or more replicated codes, the training enabling the DFE to use decision values at the DFE output to track channel variations.

Подробнее
Номер записи: 41
05-09-2013 дата публикации

Method of transmitting reference signals in a wireless communication having multiple antennas

Номер: US20130230123A1
Автор: Bong Hoe Kim, Dae Won Lee, Ki Jun Kim, Yu Jin Noh
Принадлежит: LG ELECTRONICS INC

A method of transmitting signals by a transmitting end in a wireless communication system comprises sharing control information related to reference signal with a receiving end; generating one or more precoded reference signals considering a given rank; allocating the one or more precoded reference signals to have a specific pattern within a subframe, wherein the specific pattern is varied depending on the control information; and transmitting the subframe through multiple antennas to the receiving end.

Подробнее
Номер записи: 42
19-09-2013 дата публикации

Method and device for feeding back precoding matrix indicator using interpolation

Номер: US20130242921A1
Автор: Hanbyul Seo, Hyungtae Kim, Kijun KIM
Принадлежит: LG ELECTRONICS INC

The present invention relates to a method and a device for feeding back a channel through precoding matrix indicator (PMI) interpolation. As one embodiment of the present invention, a method for feeding back a precoding matrix indicator (PMI) in a CoMP environment comprises the steps of: allowing a terminal to perform PMI interpolation by using PMIs that are included in the PMI window; allowing the terminal to select an optimum PMI by comparing the interpolated PMIs with a channel state of a current channel; and allowing the terminal to feed back the optimum PMI to a base station.

Подробнее
Номер записи: 43
10-10-2013 дата публикации

Uplink power control scheme for distributed rrh systems with same cell id

Номер: US20130265981A1
Автор: Alexei Vladimirovich Davydov, Apostolos Papathanassiou, Hujun Yin, Jin Fu, JONG-KAE FWU, Kamran Etemad, Rongzhen Yang, Xiangying Yang, Yuan Y. ZHU
Принадлежит: Intel Corp

Uplink power control in a macro cell in a wireless network comprises transmitting a reference signal from a base station device to at least one wireless device within the macro cell. The macro cell comprises the base station device and at least one radio transmitter device that is communicatively coupled to and remote from the base station device. The base station device and one or more radio transmitter devices could be selected to be a transmission point, a reception point or a combination thereof, for each wireless device. Information relating to a transmission power of the base station device is also transmitted to the at least one wireless device. An uplink signal is received from the at least one wireless device containing information relating to an uplink power determination that is based on the reference signal and the information relating to the transmission power of the base station device.

Подробнее
Номер записи: 44
17-10-2013 дата публикации

High speed signaling system with adaptive transmit pre-emphasis

Номер: US20130272359A1
Автор: Andrew C. Ho, Anthony Bessios, Elad Alon, Fred F. Chen, Mark A. Horowitz, Vladimir M. Stojanovic
Принадлежит: RAMBUS INC

A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.

Подробнее
Номер записи: 45
24-10-2013 дата публикации

Interference Cancellation with Time-Varying Interference and/or Distortion

Номер: US20130279557A1
Автор: Bruce J. Currivan, Thomas Kolze
Принадлежит: Broadcom Corp

A communications receiver includes a noise analyzer to characterize the composition of the interference and/or distortion impressed onto a transmitted communications signal in the presence of one or more time-varying conditions. The noise analyzer may provide a selection signal indicating the composition of the interference and/or distortion impressed onto a transmitted communications signal in the presence of one or more time-varying conditions to be used by the communications receiver. In an exemplary embodiment, the communications receiver selects at least one set of filter coefficients to compensate for the interference and/or distortion impressed onto a transmitted communications signal in the presence of a particular time-varying interference and/or distortion condition. In another exemplary embodiment, the communications receiver selects a corresponding interference cancellation filter hank to compensate for the interference and/or distortion impressed onto a transmitted communications signal in the presence of the particular time-varying interference and/or distortion condition.

Подробнее
Номер записи: 46
31-10-2013 дата публикации

Spectrum analysis capability in network and/or system communication devices

Номер: US20130286855A1
Автор: Bruce J. Currivan, Harold Raymond Whitehead, Roger Fish, Thomas J. Kolze
Принадлежит: Broadcom Corp

Spectrum analysis (SA) capability is included in various communication devices within a communication network. One or more of the devices use the SA information from other devices in the system to determine status of various communication links were devices in the system. One or more processors within one or more devices can identify any actual/existing or expected failure or degradation of the various components within the system. Such components may include communication devices, communication channels or links, interfaces, interconnections, etc. When an actual/existing or expected failure or degradation is identified, the affected components may be serviced or devices within the system may operate to mitigate any reduction in performance caused by such problems. Such SA functionality/capability may be implemented in one communication device or in a distributed manner across a number of devices in a communication system.

Подробнее
Номер записи: 47
31-10-2013 дата публикации

Receiver Having Limiter-Enhanced Data Eye Openings

Номер: US20130287088A1
Автор: Mohammad Mobin, Pervez Aziz, Ye Liu
Принадлежит: LSI Corp

A communication system having a receiver with a linear path and a nonlinear path. As the receiver receives a data signal, it adaptively equalizes the received signal, and amplitude-limits the equalized signal in the nonlinear path using a saturable amplifier limiter or the like. A slicer extracts data from the limited equalized received signal. In the linear path, a clock recovery circuit generates a clock signal from the equalized received signal. A delay circuit in the linear path at least partially compensates for propagation delay in the limiter. Having the clock recovery occur in other than the nonlinear path, a low jitter clock is generated. The limiter enhances the vertical opening of the data eye by increasing the rise and fall times of the limited signal, providing more noise margin for the slicer to operate with and a greater timing margin in which to sample the sliced data.

Подробнее
Номер записи: 48
31-10-2013 дата публикации

Cross-layer optimized adaptive http streaming

Номер: US20130290493A1
Автор: Jeffrey R. Foerster, Ozgur OYMAN
Принадлежит: Intel Corp

Briefly, in accordance with one or more embodiments, an application function module interacts with an application on a remote device that utilizes dynamic policy and charging control to receive an adaptive multimedia stream. A policy and charging rules function (PCRF) module implements policy and charging control decisions, and a policy and charging enforcement function (PCEF) module enforces policy decisions received from the PCRF. The remote device provides session information including a media presentation description to the application function module to provide the multimedia stream to the remote device at a specified quality of service.

Подробнее
Номер записи: 49
14-11-2013 дата публикации

Apparatus and Method for Decoding a Received Signal

Номер: US20130301756A1
Автор: Biljana Badic, Guido Horst Bruck, Peter Jung, Rajarajan Balraj, Stanislaus Iwelski, Tobias Scholand, Zijian Bai
Принадлежит: Intel Mobile Communications GmbH

An apparatus for decoding a received signal is provided. The received signal has been transmitted by conducting a transmission. The apparatus for decoding includes a detector and a filter application unit. The detector is configured to detect whether the transmission is a SU-MIMO transmission or a MU-MIMO transmission. The filter application unit is configured to apply either a first receive filter or a second different receive filter on the received signal depending on whether the transmission is the SU-MIMO transmission or the MU-MIMO transmission.

Подробнее
Номер записи: 50
28-11-2013 дата публикации

Mobile terminal, micro base station, macro base station, communication system and communication method

Номер: US20130315087A1
Автор: Hua Zhou, Jianming Wu, Yi Zhang, Yuanrong Lan, Yuantao Zhang
Принадлежит: Fujitsu Ltd

A mobile terminal, a micro base station, a macro base station, a communication system and a communication method. The method includes receiving from a micro base station a designation of specific subframe and a designation of feedback mode; judging whether a current subframe is a specific subframe designated by the micro base station; and measuring and feeding back the channel condition of the current subframe in a joint transmission feedback mode when the current subframe is the specific subframe designated by the micro base station, and measuring and feeding back the channel condition of the current subframe in a feedback mode designated by the micro base station when the current subframe is not the specific subframe designated by the micro base station.

Подробнее
Номер записи: 51
28-11-2013 дата публикации

Wireless communication system, wireless comunication apparatus and wireless communication method

Номер: US20130315177A1
Автор: Tomoya Yamaura
Принадлежит: Sony Corp

A wireless communication system which performs data transmission using spatially multiplexed streams from a first terminal including N antennas to a second terminal including M antennas (N is an integer of 2 or more and M is an integer of 1 or more) is disclosed. The system includes notifying means, training means, channel matrix estimation means, beamforming information feedback means, transmission weight matrix setting means, and beamforming means.

Подробнее
Номер записи: 52
28-11-2013 дата публикации

Wireless communication system, wireless comunication apparatus and wireless communication method

Номер: US20130315330A1
Автор: Tomoya Yamaura
Принадлежит: Sony Corp

A wireless communication system which performs data transmission using spatially multiplexed streams from a first terminal including N antennas to a second terminal including M antennas (N is an integer of 2 or more and M is an integer of 1 or more) is disclosed. The system includes notifying means, training means, channel matrix estimation means, beamforming information feedback means, transmission weight matrix setting means, and beamforming means.

Подробнее
Номер записи: 53
19-12-2013 дата публикации

Communication system with channel compensating equalizer

Номер: US20130336370A1
Автор: Alfons Dussmann, Milun Jovanovic, Thomas Kummetz
Принадлежит: Individual

A communication system and method for extending coverage of a base transceiver station. The communication system includes processing circuitry that receives a communication signal over a wireless channel. The received communication signal is processed through an adaptable equalizer to reduce noise, distortion, interference, and frequency errors. In another aspect of the invention, a frequency of a reference signal in the communication system is adjusted to compensate for frequency errors between the communication system and the source of the communication signal. The equalized and frequency adjusted communication signal is then retransmitted into an extended coverage area. Wireless coverage is thereby provided between a base transceiver station and a mobile device in the extended coverage area.

Подробнее
Номер записи: 54
02-01-2014 дата публикации

On-the-fly compensation of sampling frequency and phase offset in receiver performing ultra-high-speed wireless communication

Номер: US20140003485A1
Автор: Daiju Nakano, Yasunao Katayama, Yasuteru Kohda
Принадлежит: International Business Machines Corp

Received data oversampled twice is polyphased by the receiver, feedback is applied using an adaptive algorithm, and the filter coefficients (tap coefficient sequence) of a compensation filter are simultaneously shifted when the data shifts. The sampling frequency and the phase offset can be compensated for on the fly using a filter combining a tapped filter whose initial value is a correlation value obtained from the preamble and header of a received signal, and a wavefront aligner. In this configuration, a resampling filter circuit, an equalization filter circuit and a decimation filter circuit are realized in a single compensation filter circuit, which is much smaller than the prior art circuits in terms of size.

Подробнее
Номер записи: 55
09-01-2014 дата публикации

Methods and arrangements for selecting channel updates in wireless networks

Номер: US20140010324A1
Автор: Eldad Perahia, Shahrnaz Azizi, Thomas J. Kenney
Принадлежит: Individual

Pilot logic may determine based upon channel and phase information how to process pilot tones that shift locations every N symbols in an orthogonal frequency division multiplexing (OFDM) packet transmission. Pilot logic may determine a signal-to-noise ratio (SNR) for the channel to determine how to process the shifting pilot tones. Pilot logic may also determine channel and phase information updates such as channel state information and phase correction information from pilot tones. In situations of high SNR, logic may use channel estimates and phase rotations that are obtained from locations of the pilot tones for phase tracking and updating the equalizer. In situations of low SNR, logic may use the phase rotations for phase tracking and not update the equalizer during the OFDM transmission. Logic may also determine the presence or absence of a Doppler effect on the transmission and transmit a selection for N to an access point in response.

Подробнее
Номер записи: 56
06-02-2014 дата публикации

Decision feedback equalization with selectable tap

Номер: US20140036985A1
Автор: David Joseph Block
Принадлежит: Advanced Micro Devices Inc

A system generates a set of candidate signals based on a received signal, whereby each candidate signal represents an adjustment of the signal for a different amount of potential noise. The system selects one of the candidate signals based on a selected subset of previous samples and the values of the selected subset of samples. The subset of previous samples is selected based on a predicted noise pattern.

Подробнее
Номер записи: 57
13-02-2014 дата публикации

Intelligent p-gw relocation for sipto service continuity

Номер: US20140043993A1
Автор: Alexander Sirotkin, Chang Hong Shan, Muthaiah Venkatachalam
Принадлежит: Intel Corp

Intelligent packet data network gateway (P-GW) relocation for selected internet protocol traffic offload (SIPTO) service continuity is described. A user equipment (UE) application monitoring module, can monitor the network session state for a UE. A transition window can be determined based on both the network session state and a session continuity impact metric. A new packet data network gateway (P-GW) can be associated to the UE during the transition window in response to a determination that a current P-GW of the UE is less optimal, in at least one performance metric, than the new P-GW.

Подробнее
Номер записи: 58
06-03-2014 дата публикации

Filter calculating device, transmitting device, receiving device, processor, and filter calculating method

Номер: US20140064354A1
Автор: Alvaro Ruiz Delgado, Hiromichi Tomeba, Hiroshi Nakano, Takashi Onodera
Принадлежит: Sharp Corp

A filter calculating device includes a first equalization filter calculating section that generates at least a first conversion matrix and a first triangular matrix based on a channel state of a first channel; a first quasi-orthogonalization section that calculates a first unimodular matrix based on the first triangular matrix; and a second equalization filter calculating section that generates at least a second conversion matrix and a second triangular matrix based on a channel state of a second channel and the first unimodular matrix.

Подробнее
Номер записи: 59
27-03-2014 дата публикации

Receiving apparatus and receiving method

Номер: US20140086366A1
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.

Подробнее
Номер записи: 60
01-01-2015 дата публикации

Estimating and Utilizing Client Receive Interference Cancellation Capability in Multi-User Transmissions

Номер: US20150003261A1
Автор: Brian D. Hart, Matthew A. Silverman, Paul J. Stager
Принадлежит: Cisco Technology Inc

A first device having a plurality of antennas wirelessly transmits multiple series of test packets to a second device having one or more antennas, each series of test packets being transmitted with a different level of interference imposed on the test packets. The first device determines a packet error rate for each series of test packets transmitted by the first device. The first device derives an estimate of an interference cancellation capability of the second device based on the packet error rate for different levels of interference.

Подробнее
Номер записи: 61
06-01-2022 дата публикации

METHOD AND SYSTEM FOR BASEBAND PREDISTORTION LINEARIZATION IN MULTI-CHANNEL WIDEBAND COMMUNICATION SYSTEMS

Номер: US20220007263A1
Автор: Cho Kyoung Joon, KIM Jong Heon, KIM Wan-Jong, Stapleton Shawn Patrick
Принадлежит:

An efficient baseband predistortion linearization method for reducing the spectral regrowth and compensating memory effects in wideband communication systems using effective multiplexing modulation technique such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. The present invention is based on the method of piecewise pre-equalized lookup table based predistortion, which is a cascade of a lookup table predistortion and piecewise pre-equalizers. 1providing a pre-distortion lookup table (LUT) having N first entries, N being an integer equal to or greater than unity;providing a pre-equalization lookup table (LUT) having M second entries, M being an integer equal to or greater than unity, the pre-equalization LUT being associated with a pre-equalizer;determining an index based on a magnitude of a baseband input signal;generating a sample by multiplying the baseband input signal with an entry of the N first entries in accordance with the index; andpre-equalizing the sample using an entry of the M second entries in accordance with the index to generate a pre-equalized signal,wherein the baseband input signal is a digital complex signal, and each entry of the pre-distortion LUT comprises complex coefficients, andwherein the complex coefficients are obtained by:converting the sample to an analog baseband signal by an analog-to-digital converter while bypassing the pre-equalizer;frequency upconverting the analog baseband signal to an upconverted signal;amplifying the upconverted signal by a power amplifier to obtain an amplified signal;attenuating the amplified signal to an attenuated signal;frequency downconverting the attenuated signal to a baseband signal; andperforming an indirect learning least mean square (LMS) algorithm using the baseband signal and the baseband input signal to obtain the complex coefficients.. A method comprising: This application is a continuation of the co-pending U.S. patent application Ser. No ...

Подробнее
Номер записи: 62
04-01-2018 дата публикации

Communication channel calibration using feedback

Номер: US20180006737A1
Автор: Glenn Chiu, Jun Kim, Wayne S. Richardson
Принадлежит: RAMBUS INC

A method for calibrating a communication channel coupling first and second components includes transmitting a data signal from the first component to the second component on the communication channel, and sensing a characteristic, such as phase, of the data signal on the second component. Information about the sensed characteristic is fed back to the first component using an auxiliary channel. An adjustable parameter, such as phase, for the transmitter is adjusted on the first component in response to the information. Also, a characteristic of a data signal received from the transmitter on the second component is sensed and used to adjust an adjustable parameter for the receiver on the first component.

Подробнее
Номер записи: 63
04-01-2018 дата публикации

High-speed signaling systems with adaptable pre-emphasis and equalization

Номер: US20180006852A1
Автор: Andrew Ho, Brian S. Leibowitz, Fred F. Chen, Jared L. Zerbe, John W. Poulton, Kevin S. Donnelly, Ramin Farjad-Rad
Принадлежит: RAMBUS INC

A signaling system includes a pre-emphasizing transmitter and an equalizing receiver coupled to one another via a high-speed signal path. The receiver measures the quality of data conveyed from the transmitter. A controller uses this information and other information to adaptively establish appropriate transmit pre-emphasis and receive equalization settings, e.g. to select the lowest power setting for which the signaling system provides some minimum communication bandwidth without exceeding a desired bit-error rate.

Подробнее
Номер записи: 64
07-01-2021 дата публикации

Techniques For Generating a PAM Eye Diagram in a Receiver

Номер: US20210006439A1
Автор: Li Peng, Shimanouchi Masashi, Wu Hsinho
Принадлежит: Intel Corporation

A method facilitates determining transmission loss in a transmission signal and adjusting a receiver setting of a receiver to compensate for the transmission loss. The method includes transmitting a transmission signal from a transmitter and receiving the transmission signal by a first receiver and a second receiver. The method includes digitizing the transmission signal by the first receiver at a first sampling frequency and digitizing the transmission signal by the second receiver at a second sampling frequency that is less than or equal to the first sampling frequency. The method includes generating a PAM-n eye diagram of the transmission signal by the second receiver using digitized signals digitized by the first and second receivers and adjusting an equalizer setting of a first equalizer of the first receiver using eye-opening information of the PAM-n eye diagram where the eye-opening information includes information for the transmission loss. 1. A method comprising:transmitting a transmission signal from a transmitter;receiving the transmission signal by a first receiver and a second receiver;digitizing the transmission signal by the first receiver at a first sampling frequency;digitizing the transmission signal by the second receiver at a second sampling frequency that is less than or equal to the first sampling frequency;generating a pulse amplitude modulation (PAM) eye diagram for a plurality of transmission amplitudes of the transmission signal by the second receiver using digitized signals of the transmission signal digitized by the first and second receivers; andadjusting an equalizer setting of a first equalizer of the first receiver using eye-opening information of the PAM eye diagram to compensate for transmission loss of the transmission signal.2. The method of claim 1 , further comprising adjusting an equalizer setting of a second equalizer of the first receiver using the eye-opening information of the PAM eye diagram.3. The method of claim 2 , ...

Подробнее
Номер записи: 65
03-01-2019 дата публикации

DISTRIBUTING MULTIPLE-INPUT, MULTIPLE-OUTPUT (MIMO) COMMUNICATIONS STREAMS TO REMOTE UNITS IN A DISTRIBUTED COMMUNICATION SYSTEM (DCS) TO SUPPORT CONFIGURATION OF INTERLEAVED MIMO COMMUNICATIONS SERVICES

Номер: US20190007104A1
Автор: Chamarti Aravind, Kollat Gabriel
Принадлежит:

Distributed communications systems (DCSs) supporting configuring or reconfiguring the distribution of MIMO communications streams to designated remote units in the DCS to provide interleaved MIMO cell bonding of remote units are disclosed. In one example, the DCS includes different physical layers that are maintained from the central unit to the remote units. In this manner, the central unit can be configured or reconfigured to distribute separate MIMO communications streams to the desired physical layers in the DCS to support distributing MIMO communications streams to the desired remote units to provide the desired interleaved MIMO communications services. In this manner, interleaved MIMO communications services can be configured for a DCS using an existing infrastructure of remote units having substantially non-overlapping remote coverage areas, by directing the MIMO communications streams over the configured physical layers to be provided to the desired remote units to facilitate interleaved MIMO cell bonding of remote units. 1. A distributed communications system (DCS) , comprising:a plurality of remote units; distribute the received one or more downlink communications signals to the plurality of downlink physical layers each dedicated to a remote unit among the plurality of remote units according to the routing configuration; and', 'distribute received one or more uplink communications signals from the plurality of remote units over a plurality of uplink optical physical layers each dedicated to a remote unit among the plurality of remote units;, 'the central unit configured to, 'a central unit comprising a routing configuration assigning received one or more downlink communications signals to one or more downlink physical layers among a plurality of downlink physical layers each coupled to a dedicated remote unit among the plurality of remote units;'} distribute received uplink communications signals received over the at least one antenna over a coupled ...

Подробнее
Номер записи: 66
02-01-2020 дата публикации

METHOD FOR REMOVING SPATIAL AND TEMPORAL MULTI-PATH INTERFERENCE FOR A RECEIVER OF FREQUENCY-MODULATED RADIO SIGNALS

Номер: US20200007179A1
Автор: LIN Chao, Soulier Gérald
Принадлежит:

A method for decreasing multi-path interference, for a vehicle radio receiver including at least two radio reception antennas that each receive a plurality of radio signals composed of time-shifted radio signals resulting from a multi-path effect. The plurality of radio signals combined to deliver a combined radio signal yto be played, with: y=W[, X+, X] at time n, where xand xare vectors the components of which correspond to the plurality of signals received by the first antenna and by the second antenna, respectively, Gand Gare scalars the components of which are the complex weights of a spatial filter and wis the transpose matrix of a vector the components of which are the complex weights of a temporal filter. The method includes implementation of an iterative adaptation algorithm to determine the complex weights of the spatial filter and the complex weights of the temporal filter. 3. The method as claimed in claim 2 , wherein said iterative adaptation algorithm is a constant modulus adaptation algorithm configured to minimize the cost function.6. The method as claimed in claim 1 , wherein the temporal filter is an impulse response filter.7. A radio receiver comprising a microcontroller configured to implement the method as claimed in .8. A motor vehicle comprising a radio receiver as claimed in . This application is the U.S. National Phase Application of PCT International Application No. PCT/FR2018/051249, filed May 31, 2018, which claims priority to French Patent Application No. 1754868, filed Jun. 1, 2017, the contents of such applications being incorporated by reference herein.The invention relates to the field of the reception of frequency-modulated radio signals, in particular in mobile radio receivers exposed to the effect of multi-paths, which is known to those skilled in the art.More precisely, the present invention relates to a method for removing reflected radio waves resulting from the multi-path effect in a receiver of frequency-modulated radio ...

Подробнее
Номер записи: 67
02-01-2020 дата публикации

SYSTEM AND METHOD FOR COMMUNICATION USING ORBITAL ANGULAR MOMENTUM WITH MULTIPLE LAYER OVERLAY MODULATION

Номер: US20200007235A1
Автор: ASHRAFI NIMA, ASHRAFI SOLYMAN, LINQUIST ROGER
Принадлежит:

A system includes mode division multiplexing (MDM) processing circuitry for applying an orbital angular momentum (OAM) to each of a first group of a plurality of input signals and multiplexing the OAM processed signals together. Second processing circuitry performs wavelength distribution multiplexing (WDM) on a second group of the plurality of input signals, wherein the WDM processed signals and the MDM processed signals are orthogonal to one another. Combining circuitry combines the WDM processed signals and the MDM processed signals. Polarization processing circuitry adds polarization to at least one of the WDM processed signals, and the MDM processed signals and a transmitter transmits the combine and polarized processed signal over a link. 1. A system , comprising:mode division multiplexing (MDM) processing circuitry for applying an orbital angular momentum (OAM) to each of a first group of a plurality of input signals and multiplexing the OAM processed signals together;second processing circuitry for wavelength distribution multiplexing (WDM) to a second group of the plurality of input signals, wherein the WDM processed signals and the MDM processed signals are orthogonal to one another;combining circuitry for combining the WDM processed signals and the MDM processed signals;polarization processing circuitry for adding polarization to at least one of the WDM processed signals and the MDM processed signals; anda transmitter for transmitting the combine and polarized processed signal over a link.2. The system of claim 1 , wherein the mode division multiplexing processing circuitry further comprises circuitry for processing the second group of the plurality of input signals to associate with each of the second group of the plurality of input signals a Hermite polynomial to cause each of the second group of the plurality of input signals to be mutually orthogonal to each other to enable transmission of each of the second group of the plurality of input signals on ...

Подробнее
Номер записи: 68
02-01-2020 дата публикации

METHOD AND APPARATUS FOR ANTENNA ARRAY CALIBRATION USING ON-BOARD RECEIVER

Номер: US20200007244A1
Автор: Ben Ghalba Slim
Принадлежит:

A method and apparatus for providing feedback for cancellation of signal impairment in a plurality of separate transmit paths of a transmitter are disclosed. According to one aspect, a method includes receiving a plurality of outbound signals transmitted to the antenna array, the received outbound signals having traversed separate transmit paths of the transmitter. The method also includes converting the plurality of received outbound signals to a corresponding plurality of parallel baseband signals. The corresponding plurality of parallel baseband signals are serialized into a serial feedback signal. 1. A method in a feedback processor at an antenna array for obtaining feedback signals to compensate for signal impairment in a plurality of separate transmit paths , the method comprising:receiving a plurality of outbound signals transmitted to the antenna array, the received outbound signals having traversed separate transmit paths of the transmitter;converting the plurality of received outbound signals to a corresponding plurality of parallel baseband signals; andserializing the corresponding plurality of parallel baseband signals into a serial feedback signal; andconverting the serial feedback signal into a plurality of parallel feedback signals, each parallel feedback signal corresponding to one of the derived feedback signals from the plurality of outbound signals.2. The method of claim 1 , wherein the converting to the corresponding plurality of baseband signals comprises sampling and demodulating the plurality of outbound signals.3. The method of claim 1 , further comprising transmitting the serial feedback signal to a radio unit.4. The method of claim 3 , wherein the transmitting of the serial feedback signal is in response to a request from the radio unit.5. The method of claim 1 , wherein the plurality of baseband signals are time domain baseband signals claim 1 , the method further comprising transforming the corresponding plurality of time domain baseband ...

Подробнее
Номер записи: 69
03-01-2019 дата публикации

IMAGE DISTORTION CORRECTION IN A WIRELESS TERMINAL

Номер: US20190007240A1
Автор: FORRESTER Jamil Mark, Jiang Hong, ZHANG Zhihang
Принадлежит:

A circuit in a wireless communications terminal/device and a method is described for reducing an image distortion. By measuring three gain mismatches of I path and Q path of a transceiver, and estimating a value of an IQ mismatch coefficient based on the three gain mismatches; and applying a measurement adjustment to the I path or the Q path based on the value of the IQ mismatch coefficient, the image distortion is reduced. 1. A method performed by a wireless terminal including a transceiver , the method comprising:measuring, by the wireless terminal, a first gain mismatch of I path and Q path of the transceiver having a first RF gain setting, a second gain mismatch of I path and Q path of the transceiver having a second RF gain setting, and a third gain mismatch of I path and Q path of the transceiver having a third RF gain setting;estimating, by the wireless terminal, a value of an IQ mismatch coefficient based on the first gain mismatch, the second gain mismatch and the third gain mismatch; andapplying, by the wireless terminal, a measurement adjustment to I path or Q path based on the value of the IQ mismatch coefficient to reduce an image distortion.2. The method of claim 1 , wherein the estimating the value of the IQ mismatch coefficient comprises:estimating, by the wireless terminal, a value of a static gain mismatch coefficient based on the first gain mismatch and the second gain mismatch; andestimating, by the wireless terminal, the value of the IQ mismatch coefficient based on the static gain mismatch coefficient and the third gain mismatch.6. The method of claim 1 , wherein the measuring the first gain mismatch of I path and Q path comprises:transmitting, by the wireless terminal, a first signal by a transmitter of the wireless terminal;detecting, by the wireless terminal, a second signal by a receiver of the wireless terminal, the second signal comprising distortion caused by I path and Q path mismatch; andestimating, by the wireless terminal, the first ...

Подробнее
Номер записи: 70
02-01-2020 дата публикации

Discontinuous Fast-Convolution Based Filter Processing

Номер: US20200007361A1
Автор: Alaa Eddin Loulou, Juha YLI-KAAKINEN, Kari Pekka Pajukoski, Markku Renfors, Toni Aleksi Levanen
Принадлежит: NOKIA TECHNOLOGIES OY

According to an aspect, there is provided a waveform processing device. The waveform processing device includes circuitry for receiving an input signal including one or more subsequent orthogonal frequency division multiplexing, OFDM, symbol blocks each of which includes a cyclic prefix and an OFDM data block and corresponds to one or more subbands. Further, the waveform processing device includes circuitry for segmenting each OFDM symbol block of the input signal into a set of a pre-defined number of partially overlapping signal blocks of equal length so that non-overlapping samples of the pre-defined number of partially overlapping signal blocks in each set include, in combination, an OFDM data block. Moreover, the waveform processing device includes circuitry for filtering each signal block in each set and for combining the filtered signal blocks in each set using overlap-and-save processing to produce one or more filtered OFDM data blocks for each subband.

Подробнее
Номер записи: 71
12-01-2017 дата публикации

ADAPTIVE EQUALIZATION CIRCUIT, DIGITAL COHERENT RECEIVER, AND ADAPTIVE EQUALIZATION METHOD

Номер: US20170012803A1
Автор: HATAE Kazuhiko, KATOU Tomoki, KOIZUMI Nobukazu, OHTOMO Yasuo, OOTA Masato, SASAKI Daisuke, Sato Masashi, YAMAZAKI Manabu
Принадлежит: FUJITSU LIMITED

A circuit includes a calculation circuit configured to calculate a noise power of a predetermined-training-sequence pattern repeatedly included in a first signal input into an adaptive equalizer, based on a second signal obtained by compensating the first signal by a compensation circuit, a channel-estimation value based on the second signal, and the predetermined-training-sequence pattern; and an average circuit configured to obtain an average value of estimation values of frequency offsets based on the predetermined-training-sequence pattern having the noise power equal to or smaller than a predetermined power, among estimation values of frequency offsets based on the predetermined-training-sequence pattern, wherein the compensation circuit is configured to compensate a frequency offset of the predetermined-training sequence pattern based on the average value and thereby obtain the second signal, and the adaptive equalizer is configured to perform adaptive-equalization processing of the first signal with a setting value based on the second signal. 1. An adaptive equalization circuit , comprising:a calculation circuit configured to calculate a noise power of a predetermined training sequence pattern repeatedly included in a first signal input into an adaptive equalizer, based on a second signal obtained by compensating the first signal by a compensation circuit, a channel estimation value based on the second signal, and the predetermined training sequence pattern; andan average circuit configured to obtain an average value of estimation values of frequency offsets based on the predetermined training sequence pattern having the noise power equal to or smaller than a predetermined power, among estimation values of frequency offsets based on the predetermined training sequence pattern, whereinthe compensation circuit is configured to compensate a frequency offset of the predetermined training sequence pattern based on the average value and thereby obtain the second ...

Подробнее
Номер записи: 72
14-01-2016 дата публикации

METHOD OF MAXIMIZING MIMO THROUGHPUT BY PLACING ANTENNAS IN A VEHICLE

Номер: US20160013839A1
Автор: Bekaryan Arthur, Carper Duane S., SCHAFFNER James H., SONG HYOK JAE, Talty Timothy J., Yasan Eray
Принадлежит:

An arrangement of MIMO antennas in a vehicle, such as an automobile, where at least one of the MIMO antennas is placed inside the vehicle in the richer multipath signal propagation environment. The MIMO antennas will include a primary MIMO antenna that may also be used for non-4G cellular services and one or more secondary MIMO antennas that are used only for 4G cellular services. In one embodiment, the primary MIMO antenna is mounted to a roof of the vehicle in a module including other antennas and the one or more secondary antennas are positioned at desired locations within the vehicle. In another embodiment, the primary MIMO antenna and the one or more secondary MIMO antennas are all positioned within the vehicle. 1. A multi-input multi-output (MIMO) communications system for use in a vehicle having an enclosure , said system comprising:a plurality of MIMO antennas mounted to the vehicle where at least one of the MIMO antennas is within the enclosure of the vehicle; anda receiver receiving signals from the MIMO antennas.2. The MIMO system according to wherein one of the MIMO antennas is mounted to an exterior structure of the vehicle.3. The MIMO system according to wherein the one MIMO antenna is mounted to a roof of a vehicle.4. The MIMO system according to wherein the one MIMO antenna is a primary MIMO antenna.5. The MIMO system according to wherein the primary MIMO antenna is mounted within a common antenna module with other non-MIMO antenna elements.6. The MIMO system according to wherein the antenna module is a shark-fin type antenna module.7. The MIMO system according to wherein all of the MIMO antennas are mounted within the enclosure of the vehicle.8. The MIMO system according to wherein the at least one antenna mounted within the enclosure is mounted in a roof liner of the vehicle.9. The MIMO system according to wherein the at least one MIMO antenna mounted within the enclosure is mounted to a seat of the vehicle.10. The MIMO system according to wherein ...

Подробнее
Номер записи: 73
11-01-2018 дата публикации

Channel Estimation In OFDM Communication Systems

Номер: US20180013591A1
Автор: Bagheri Rahim, Djafari Masoud, Fard Ali, Gowda Kiran, Heidari Esmael, Pourkhaatoun Mohsen, Shafiee Hamid, Shetty Siddharth
Принадлежит: MICROCHIP TECHNOLOGY INCORPORATED

Embodiments of the present disclosure include an OFDM receiver circuit, which includes an FFT circuit configured to calculate an FFT of a plurality of sample values received by the receiver circuit, and a smoothing circuit configured to identify equalizer coefficients for the sample values by truncating portions of an impulse response of the FFT. 1. An OFDM receiver circuit , comprising:a Fast Fourier Transform (FFT) circuit configured to calculate an FFT of a plurality of sample values received by the receiver circuit; anda smoothing circuit configured to identify equalizer coefficients for the sample values by truncating portions of an impulse response of the FFT.2. The OFDM receiver circuit of claim 1 , wherein the smoothing circuit is further configured to identify the equalizer coefficients by truncating portions of the impulse response of the FFT beyond a defined length of the impulse response.3. The OFDM receiver circuit of claim 1 , wherein the smoothing circuit is further configured to identify the equalizer coefficients by performing an inverse FFT on channel frequency response of the plurality of sample values claim 1 , truncating portions of the impulse response in results of the inverse FFT claim 1 , and performing an FFT on results of the truncation.4. The OFDM receiver circuit of claim 1 , wherein the smoothing circuit is further configured to:estimate a value of a null sub-carrier in a channel frequency response of the plurality of sample values;perform an inverse FFT on channel frequency response of the plurality of sample values with the estimated value of the null-subcarrier;truncate portions of the impulse response in results of the inverse FFT; andperform an FFT on results of the truncation.5. The OFDM receiver circuit of claim 1 , wherein the smoothing circuit is further configured to:estimate a value of a null sub-carrier in a channel frequency response of the plurality of sample values;perform an inverse FFT on channel frequency response of ...

Подробнее
Номер записи: 74
11-01-2018 дата публикации

Establishment of connection to the internet in cellular network

Номер: US20180014177A1
Автор: Alexander Sirotkin, Alexandre S. STOJANOVSKI
Принадлежит: Intel IP Corp

Some demonstrative embodiments include devices, systems and/or methods to establish a connection to the Internet via a local gateway (L-GW) function for a LIPA or a SIPTO@LN. The establishment of the connection to the Internet may be performed, for example, by at least one of an E-RAB SETUP procedure, an INITIAL CONTEXT SETUP procedure, an INITIAL UE MESSAGE procedure or an UPLINK NAS TRANSPORT procedure.

Подробнее
Номер записи: 75
15-01-2015 дата публикации

CLOCK AND DATA RECOVERY ARCHITECTURE WITH ADAPTIVE DIGITAL PHASE SKEW

Номер: US20150016497A1
Автор: Annampedu Viswanath, Aziz Pervez M., Malipatil Amaresh V.
Принадлежит: LSI Corporation

In described embodiments, a method for producing sample decisions with a digital signal processing-based SERDES device includes converting an analog signal to a digital signal, equalizing the digital signal, selecting inputs for a phase detector in a main CDR loop, computing a phase difference signal, producing a phase skew to signals for a last equalization stage by a first interpolation filter bank, generating a control signal to control the phase provided by the first interpolation filter bank by a phase skew adaptation loop, and updating the phase skew values to generate a resulting decision. A device includes a first interpolation filter bank inserted between the equalization stages is configured to generate phase skew signals to a last equalization stage and a phase skew loop responsive to the last equalization stage is configured to adjust the phase skew provided by the first interpolation filter bank. 1. A method for producing sample decisions with a digital signal processing-based SERDES device , the method comprising the steps of:converting a received analog signal to a digital signal by an analog to digital converter in response to a sample clock;equalizing the digital signal by a feed forward equalizer followed by a decision feedback equalizer;selecting as inputs for a phase detector either the digital signal from the analog to digital converter or the equalized signal from the feed forward equalizer;computing a phase difference signal by the phase detector;adjusting, in response to the phase difference signal, a phase of the sample clock applied to the analog to digital converter;providing a phase skew to an equalized digital signal from the feed forward equalizer by a first interpolation filter bank inserted between the feed forward equalizer and the decision feedback equalizer;generating a control signal to control the phase skew provided by the first interpolation filter bank by a phase skew adaptation loop using an output of the decision feedback ...

Подробнее
Номер записи: 76
14-01-2021 дата публикации

METHOD AND SYSTEM FOR MULTIPLE INPUT, MULTIPLE OUTPUT COMMUNICATIONS IN MILLIMETER WAVE NETWORKS

Номер: US20210013934A1
Автор: Cole-Rhodes Arlene, Taiwo Peter
Принадлежит:

Disclosed herein are methods and systems for processing signals from multiple users at an antenna array, and to provide beamforming for transmitting to those multiple users, and more particularly for channel estimation and wireless signal recovery in wireless networks carrying transmissions in the millimeter wave frequency bands to enable such beamforming. Such methods and systems enable MIMO communications at millimeter wave frequencies for multiple users communicating with a MIMO antenna system, such as a massive MIMO multi-antenna system (multi-antenna arrays that consist of hundreds of antenna elements). Such methods and systems may characterize the communications link (i.e., channel) at that frequency band, and directly provide a precoding matrix for beam steering towards a particular user that is in communication with the antenna system. 1. A method for processing wireless signals received from multiple users at an antenna array , comprising the steps of:providing a base station equipped with a phased array antenna system;receiving at said phased array antenna system a plurality of wireless uplink transmissions in a millimeter frequency band of 30 GHz-300 GHz, each said wireless uplink transmission being received through a distinct wireless communications channel from a distinct wireless transmitter;applying adaptive, block processing blind channel equalization to generate channel state information by providing an estimate of a channel path for each one of said wireless communications channels, and to separate out and recover individual wireless uplink transmissions from said plurality of wireless uplink transmissions; andgenerating a zero-forcing precoding matrix to beamform a downlink signal toward a transmitter of one of said wireless uplink transmissions through a corresponding channel between said transmitter and said base station based on said estimated channel state information of said corresponding channel.2. The method of claim 1 , wherein said phased ...

Подробнее
Номер записи: 77
09-01-2020 дата публикации

Decision Feedback Equalizer

Номер: US20200014565A1
Автор: Brian S. Leibowitz, Jaeha Kim
Принадлежит: RAMBUS INC

A decision-feedback equalizer (DFE) samples an analog input signal against M references during the same symbol time to produce M speculative samples. Select logic in the DFE, then decodes N bits resolved previously for previous symbol times to select one of the M speculative samples as the present resolved bit. The present resolved bit is then stored as the most recent previously resolved bit in preparation for the next symbol time. The select logic can be can be programmable to accommodate process, environmental, and systematic variations.

Подробнее
Номер записи: 78
19-01-2017 дата публикации

DECODING METHOD USING DYNAMIC SCALER FACTOR

Номер: US20170019213A1
Автор: Ku Yu-Hsien
Принадлежит:

A decoding method applied to a convolutionally coded signal is provided. The method includes: adjusting first input information according to a first scaling factor to generate first a-priori information; b) decoding the convolutionally coded signal according to systematic information and the first a-priori information to generate first extrinsic information; c) adjusting second input information according to a second scaling factor to generate second a-priori information, wherein the second scaling factor is generated according to the first extrinsic information and the first a-priori information; and d) decoding the convolutionally coded signal according to the systematic information and the second a-priori information to generate second extrinsic information. One of step (b) and step (d) further generates a-posteriori information as a decoding result. 1. A decoding method applied to a convolutionally coded signal , comprising:a) adjusting first input information according to a first scaling factor to generate first a-priori information;b) decoding the convolutionally coded signal according to systematic information and the first a-priori information to generate first extrinsic information;c) adjusting second input information according to a second scaling factor to generate second a-priori information, wherein the second scaling factor is generated according to the first extrinsic information and the first a-priori information; andd) decoding the convolutionally coded signal according to the systematic information and the second a-priori information to generate second extrinsic information;wherein, one of step (b) and step (d) further generates a-posteriori information as a decoding result.2. The method according to claim 1 , decoding the convolutionally coded signal by an iteration loop method claim 1 , each iteration loop comprising:a1) performing a first half iteration; andb1) performing a second half iteration;wherein, the step of generating the first a-priori ...

Подробнее
Номер записи: 79
18-01-2018 дата публикации

MANAGEMENT TECHNIQUES FOR WIRELESS NETWORK MOBILITY PROCEDURES

Номер: US20180020341A1
Автор: Sirotkin Sasha, Stojanovski Alexandre S.
Принадлежит: Intel IP Corporation

Connection management techniques for wireless network mobility procedures are described. In one embodiment, for example, an evolved packet core (EPC) node may comprise a processor circuit to receive a notification of a mobility procedure for a user equipment (UE), determine whether to release a local gateway (L-GW)-provided packet data network (PDN) connection of the UE, and in response to a determination that the L-GW-provided PDN connection is to be released, send either a detach request message or a delete session request message to initiate a process for releasing the L-GW-provided PDN connection. Other embodiments are described and claimed. 1. An evolved packet core (EPC) node , comprising:a processor circuit to receive a notification of a mobility procedure for a user equipment (UE), determine whether to release a local gateway (L-GW)-provided packet data network (PDN) connection of the UE, and in response to a determination that the L-GW-provided PDN connection is to be released, send either a detach request message or a delete session request message to initiate a process to release the L-GW-provided PDN connection.2. The EPC node of claim 1 , the L-GW-provided PDN connection comprising a selected internet protocol traffic offload at local network (SIPTO@LN) PDN connection.3. The EPC node of claim 1 , the processor circuit to send a detach request message to initiate a mobility management entity (MME)-initiated detach process to release the L-GW-provided PDN connection in response to a determination that the L-GW-provided PDN connection comprises an only PDN connection of the UE.4. The EPC node of claim 1 , the processor circuit to send a delete session request message to initiate a mobility management entity (MME)-requested PDN disconnection process to release the L-GW-provided PDN connection in response to a determination that the L-GW-provided PDN connection does not comprise an only PDN connection of the UE.5. The EPC node of claim 4 , the processor ...

Подробнее
Номер записи: 80
17-01-2019 дата публикации

High-speed receiver architecture

Номер: US20190020415A1
Автор: Carl Grace, Diego Ernesto Crivelli, German Cesar Augusto Luna, Hugo Santiago Carrer, Mario Rafael Hueda, Oscar Ernesto Agazzi
Принадлежит: Inphi Corp

A receiver (e.g., for a 10G fiber communications link) includes an interleaved ADC coupled to a multi-channel equalizer that can provide different equalization for different ADC channels within the interleaved ADC. That is, the multi-channel equalizer can compensate for channel-dependent impairments. In one approach, the multi-channel equalizer is a feedforward equalizer (FFE) coupled to a Viterbi decorder, for example, a sliding block Viterbi decoder (SBVD); and the FFE and/or the channel estimator for the Viterbi decoder are adapted using the LMS algorithm.

Подробнее
Номер записи: 81
17-01-2019 дата публикации

HIGH-SPEED INTERCONNECT SOLUTIONS WITH SUPPORT FOR CO-PROPAGATING AND COUNTER-PROPAGATING CONTINUOUS TIME BACK CHANNEL COMMUNICATION

Номер: US20190020509A1
Автор: Healey Adam
Принадлежит:

The present disclosure is directed to systems, apparatuses, and methods for performing continuous or periodic link training. Existing link training protocols generally perform link training only once during startup or initialization of a link and, as a result, are limited in their applications. After link training is performed and Open Systems Interconnect (OSI) data link layer and other high-layer data is transmitted across the link, no further link training is performed using these existing link training protocols. However, parameters of the link may change over time after link training is performed, such as temperature of the link and voltage levels of signals transmitted over the link by the transmitter of the transmitter-receiver pair. 1. A network device for performing serializer-deserializer communication with a remote link partner (LP) over a transmission line , the network device comprising: a decoder configured to extract first link training data from a co-propagating link training communication channel in a first signal received from the remote LP over the transmission line, wherein the co-propagating link training communication channel co-exists with data traffic corresponding to an Open Systems Interconnect (OSI) data link layer and other higher OSI layers in the first signal, and', 'a link training transmitter configured to transmit second link training data over a counter-propagating link training communication channel in a second signal transmitted to the remote LP over the transmission line; and, 'a network device receiver comprisinga network device transmitter comprising a transmitter front-end, an encoder, and an adaptation parameter receiver configured to receive the first link training data from the receiver and adjust one or more parameters of the transmitter front-end or the encoder based on the first link training data.2. The network device of claim 1 , wherein the second signal is transmitted at a same time as the first signal over the ...

Подробнее
Номер записи: 82
17-01-2019 дата публикации

HIGH-SPEED INTERCONNECT SOLUTIONS WITH SUPPORT FOR SECONDARY CONTINUOUS TIME IN-BAND BACK CHANNEL COMMUNICATION FOR SIMPLEX RETIMER SOLUTIONS

Номер: US20190020510A1
Автор: Healey Adam, Valliappan Magesh
Принадлежит:

The present disclosure is directed to systems, apparatuses, and methods for performing continuous or periodic link training. Existing link training protocols generally perform link training only once during startup or initialization of a link and, as a result, are limited in their applications. After link training is performed and Open Systems Interconnect (OSI) data link layer and other high-layer data is transmitted across the link, no further link training is performed using these existing link training protocols. However, parameters of the link may change over time after link training is performed, such as temperature of the link and voltage levels of signals transmitted over the link by the transmitter of the transmitter-receiver pair. 1. A network device for performing serializer-deserializer communication with a remote link partner (LP) over a transmission line , the network device comprising:a retimer receiver comprising a decoder configured to extract link training data from an in-band link training communication channel in a signal received from the remote link remote LP over the transmission line, wherein the in-band link training communication channel is embedded among data traffic corresponding to an Open Systems Interconnect (OSI) data link layer and other higher OSI layers in the signal; anda transmitter comprising a transmitter analog front-end (AFE), an encoder, and an adaptation parameter receiver configured to receive, through a pass through retimer transmitter and a pass through receiver, the link training data from the retimer receiver and adjust one or more parameters of the transmitter AFE or the encoder based on the link training data.2. The network device of claim 1 , wherein the in-band link training communication channel is formed using overhead from a Physical Coding Sublayer (PCS) protocol that is part of the OSI networking protocol sublayer.3. The network device of claim 2 , wherein the overhead is pad bits included in alignment markers ...

Подробнее
Номер записи: 83
17-01-2019 дата публикации

High-speed interconnect solutions with support for continuous time in-band back channel communication and proprietary communication speeds

Номер: US20190020511A1
Автор: Adam Healey, Velu Pillai
Принадлежит: Avago Technologies General IP Singapore Pte Ltd

The present disclosure is directed to systems, apparatuses, and methods for performing continuous or periodic link training. Existing link training protocols generally perform link training only once during startup or initialization of a link and, as a result, are limited in their applications. After link training is performed and Open Systems Interconnect (OSI) data link layer and other high-layer data is transmitted across the link, no further link training is performed using these existing link training protocols. However, parameters of the link may change over time after link training is performed, such as temperature of the link and voltage levels of signals transmitted over the link by the transmitter of the transmitter-receiver pair.

Подробнее
Номер записи: 84
17-01-2019 дата публикации

METHOD AND NODE IN A WIRELESS COMMUNICATION NETWORK

Номер: US20190020512A1
Автор: RAJATHEVA Premanandana
Принадлежит:

Transmitting device for a wireless communication system and method therein for transmitting data. The transmitting device comprises a processor, configured to: obtain a channel response (h); determine pre-processing coefficients (g, g, g) of a pre-processor structure, based on the obtained channel response (h); and pre-process the data, based on the pre-processor structure and the determined pre-processing coefficients (g, g, g). The transmitting device comprises a transmitter, configured to transmit the pre-processed data. 1. A transmitting device in a wireless communication system , the transmitting device comprising: obtain a channel response;', 'determine processing coefficients based on the channel response; and', 'process the data based on the processing coefficients to generate processed data; and, 'a processor configured toa transmitter configured to transmit the processed data to a receiving device.2. The transmitting device according to claim 1 , wherein the processor is further configured to:select a processor structure based on the channel response, wherein the processor structure includes a number of processing steps; andinform the receiving device about the processor structure.3. The transmitting device according to claim 1 , wherein the transmitting device operates in a Frequency Division Duplex mode claim 1 , the transmitting device further comprising:a receiver;wherein the transmitter is further configured to transmit a pilot signal; andwherein the receiver is configured to receive the channel response based on the pilot signal transmitted by the transmitter.4. The transmitting device according to claim 1 , wherein the transmitting device operates in a Time Division Duplex mode claim 1 , the transmitting device further comprising:a receiver configured to receive an uplink pilot signal from the receiving device;wherein the processor is further configured to obtain the channel response by computing the channel response based on the uplink pilot signal ...

Подробнее
Номер записи: 85
16-01-2020 дата публикации

TRANSMISSION METHOD, TRANSMISSION APPARATUS, RECEPTION METHOD AND RECEPTION APPARATUS

Номер: US20200021345A1
Автор: Kimura Tomohiro, MURAKAMI Yutaka, Ouchi Mikihiro
Принадлежит:

All data symbols used in data transmission of a modulated signal are precoded by hopping between precoding matrices so that the precoding matrix used to precode each data symbol and the precoding matrices used to precode data symbols that are adjacent to the data symbol in the frequency domain and the time domain all differ. A modulated signal with such data symbols arranged therein is transmitted. The present invention relates to a precoding method, a precoding device, a transmission method, a transmission device, a reception method, and a reception device that in particular perform communication using a multi-antenna.Multiple-Input Multiple-Output (MIMO) is a conventional example of a communication method using a multi-antenna. In multi-antenna communication, of which MIMO is representative, multiple transmission signals are each modulated, and each modulated signal is transmitted from a different antenna simultaneously in order to increase the transmission speed of data.shows an example of the structure of a transmission and reception device when the number of transmit antennas is two, the number of receive antennas is two, and the number of modulated signals for transmission (transmission streams) is two. In the transmission device, encoded data is interleaved, the interleaved data is modulated, and frequency conversion and the like is performed to generate transmission signals, and the transmission signals are transmitted from antennas. In this case, the method for simultaneously transmitting different modulated signals from different transmit antennas at the same time and at the same frequency is spatial multiplexing MIMO.In this context, it has been suggested in Patent Literature 1 to use a transmission device provided with a different interleave pattern for each transmit antenna. In other words, the transmission device in would have two different interleave patterns with respective interleaves (πa, πb). As shown in Non-Patent Literature 1 and Non-Patent ...

Подробнее
Номер записи: 86
21-01-2021 дата публикации

SIGNAL GENERATOR

Номер: US20210021368A1
Автор: Harrison Richard, Hill Paul
Принадлежит:

Disclosed is a method of producing an output signal from a signal generator, comprising: determining a driving input to the signal generator, the driving input for driving the signal generator to provide a predetermined output signal, wherein the output signal includes at least one frame, the at least one frame comprising an active period and a dummy period and wherein the active period and dummy period are determined by the driving input. Also disclosed is a method of producing an output signal from a signal generator, comprising: receiving a synchronisation signal; obtaining an input signal for controlling the signal generator to generate an output signal comprising at least one frame wherein the at least one frame comprises at least one active period and at least one dummy period; producing the output signal comprising a series of frames; and, synchronising the output signal with the synchronisation signal by varying a duration of the at least one of the dummy period or active period. 1. A method of producing an output signal from a signal generator , comprising:determining a driving input to the signal generator, the driving input for driving the signal generator to provide a predetermined output signal,wherein the output signal includes at least one frame, the at least one frame comprising an active period and a dummy period and wherein the active period and dummy period are determined by the driving input.2. A method as claimed in claim 1 , further comprising adjusting a duration of one or more of the active period and the dummy period to synchronise the output signal with a synchronisation signal.3. A method as claimed in claim 2 , further comprisingselecting a synchronisation point in the output signal;selecting a synchronisation point in the synchronisation signal; and,determining an offset error which relates to the difference between the two synchronisation points, wherein adjusting the duration of one or more active and dummy period reduces the offset ...

Подробнее
Номер записи: 87
21-01-2021 дата публикации

INCREASING AVERAGE POWER LEVELS TO REDUCE PEAK-TO-AVERAGE POWER LEVELS USING ERROR CORRECTION CODES

Номер: US20210021370A1
Автор: Hassan Amer Aref
Принадлежит:

Disclosed in some examples are methods, systems, devices, and machine-readable mediums which optimize one or more metrics of a communication system by intentionally changing symbols in a bitstream after encoding by, an error correction coder, but prior to transmission. The symbols may be changed to meet a communication metric optimization goal, such as decreasing a high PAPR, reducing an error rate, reducing an average power level (to save battery), or altering some other communication metric. The symbol that is intentionally changed is then detected by the receiver as an error and corrected by the receiver utilizing the error correction coding. 1. A device for transmitting data , the device comprising:a processor; receiving a bitstream for transmission;', 'increasing an average power level of a transmitter for transmission of a portion of the bitstream on a channel, the increased average power level greater than an average power level specified by a communication protocol for transmitting the portion of the bitstream given a current communication channel condition;', 'determining a first number of symbols corresponding to the portion of the bitstream to be changed, the first number determined based upon a communication metric resulting from the increase in average power level, the first number of symbols more than a second number of symbols that would be changed based upon the communication metric prior to the increase;', 'selecting the first number of symbols in the portion of the bitstream and changing a value of each of the selected first number of symbols; and', 'transmitting the bitstream using the increased average power level., 'a memory, storing instructions, which when executed by the processor, causes the processor to perform operations comprising2. The device of claim 1 , wherein the operations further comprise applying an error correction code prior to changing a value of each of the selected first number of symbols.3. The device of claim 1 , wherein ...

Подробнее
Номер записи: 88
26-01-2017 дата публикации

Pam data communication with reflection cancellation

Номер: US20170026202A1
Автор: Jamal Riani, Sudeep Bhoja
Принадлежит: Inphi Corp

The present invention is directed to data communication systems and methods. More specifically, embodiments of the present invention provide a communication system that removes reflection signals. A digital data stream is processed through both tentative path and the main path. The tentative path uses a first DFE device and a reflection cancellation circuit to generate a correction signal for removing reflection signal from the digital data stream. A second DFE device removes ISI and other noises from the corrected digital data stream. There are other embodiments as well.

Подробнее
Номер записи: 89
26-01-2017 дата публикации

RECEIVER AND METHOD OF RECEIVING

Номер: US20170026220A1
Автор: Atungsiri Samuel Asangbeng
Принадлежит: SONY CORPORATION

A receiver for detecting and recovering payload data from a received signal, the receiver comprising a radio frequency demodulation circuit configured to detect the received signal, the received signal carrying the payload data as Orthogonal Frequency Division Multiplexed, OFDM, symbols in one or more of a plurality of time divided frames, each frame including a preamble including a plurality of bootstrap OFDM symbols. One or more of the bootstrap OFDM symbols of the preamble carry signalling data represented as a relative cyclic shift of a signature sequence carried by the bootstrap OFDM symbols, the signalling data providing an indication of parameters for detecting and recovering the payload data carried by the one or more frames. The receiver comprises a detector circuit configured to detect and to convert a useful part of the one or more of the bootstrap OFDM symbols into the frequency domain and a bootstrap processor. The bootstrap processor is configured to generate, using the signature sequence, an estimate of a channel transfer function from a first bootstrap OFDM symbol, and to decode the signalling information carried by one or more other bootstrap OFDM symbols using the estimate of the channel transfer function and the signature sequence. A demodulator circuit is configured to recover the signalling data from the one or more bootstrap OFDM symbols using the estimate of the channel transfer function. The bootstrap processor is configured to generate, for each of the one or more other bootstrap OFDM symbols, an updated version of the channel transfer function, to equalise each of the one or more other bootstrap OFDM symbols using the updated version of the channel transfer function for each of the one or more other bootstrap OFDM symbols, and to detect the signalling data carried by the one or more other bootstrap OFDM symbols by correlating the equalised one or more other bootstrap OFDM symbols with a reproduced version of the signature sequence. ...

Подробнее
Номер записи: 90
28-01-2016 дата публикации

Interference estimation for lte receiver

Номер: US20160028558A1
Автор: Li Guo
Принадлежит: Texas Instruments Inc

A method of estimating interference in a received signal is disclosed. The method includes receiving a plurality of subcarriers from a remote transmitter. Each of the subcarriers is multiplied by a control signal. At least two of the subcarriers are compared to produce a differential signal. Interference is estimated in response to the differential signal.

Подробнее
Номер записи: 91
25-01-2018 дата публикации

MULTI-STAGE ISOLATION SUB-SYSTEM FOR A REMOTE ANTENNA UNIT

Номер: US20180026704A1
Автор: Lange Keld Knut
Принадлежит:

Certain features relate to a remote antenna unit having a multi-stage isolation sub-system for isolating uplink and downlink signal paths. A multi-stage isolation sub-system in the remote antenna unit can include a first stage device that is configured to generate a cancellation signal for canceling unwanted downlink signals received at the uplink antenna. The isolation sub-system can also include a second stage device configured to generate a cancellation signal that attenuates residual noise and intermodulation products generated in the downlink path and received in the uplink path. The multi-stage isolation sub-system can combine the cancellation signals with signals received on the uplink path in order to cancel or attenuate downlink leakage signals and residual noise present on the uplink path. 1. A multi-stage isolation sub-system , comprising:a first stage device configured to generate a first cancellation signal for attenuating a downlink leakage signal received on an uplink channel, the first cancellation signal comprising an inverse signal characteristic as compared to the downlink leakage signal; anda second stage device communicatively coupled to the first stage device and configured to generate a second cancellation signal for attenuating residual downlink noise and downlink intermodulation products received on the uplink channel.2. The multi-stage isolation sub-system of claim 1 , further comprising a coupler configured to combine the first cancellation signal and the second cancellation signal with signals received on the uplink channel.3. The multi-stage isolation sub-system of claim 2 , wherein the first stage comprises an air interface modeling module; andwherein the second stage comprises a non-linearity modeling module.4. The multi-stage isolation sub-system of claim 3 , wherein the first stage device comprises an adaptive filter communicatively coupled to the air interface modeling module and the second stage device comprises a non-linear ...

Подробнее
Номер записи: 92
25-01-2018 дата публикации

METHOD OF DATA TRANSMISSION IN MULTIPLE ANTENNA SYSTEM

Номер: US20180026757A1
Автор: Chung Jae Hoon, Han Seung Hee, Ko Hyun Soo, Lee Moon Il
Принадлежит:

A method of data transmission includes determining the number of layers, generating mapping symbols by mapping modulation symbols for a first codeword and modulation symbols for a second codeword to each layer, and transmitting the mapping symbols through a plurality of antennas. At least one of the first codeword and the second codeword is mapped to at least 3 layers and the number of layers is larger than 3. 110-. (canceled)12. The method of claim 11 , wherein the number of the plurality of layers is smaller than or equal to a number of the plurality of antennas.13. The method of claim 11 , further comprising: determining the number of the plurality of layers.15. The receiver of claim 14 , wherein the number of the plurality of layers is smaller than or equal to a number of the plurality of antennas.16. The receiver of claim 14 , the processor determines the number of the plurality of layers. The present invention relates to a multiple antenna system, and more particularly, to a method of transmitting a codeword by mapping the codeword to a layer in the multiple antenna system.Wireless communication systems are widely spread all over the world to provide various types of communication services such as voice or data. In general, the wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit (Tx) power, etc.). Examples of the multiple access system include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access (SC-FDMA) system, etc.The OFDMA is a multiple access scheme for allocating subcarriers having orthogonality to respective users. The OFDMA can reduce inter-symbol interference (ISI) and provide a high data rate by supporting ...

Подробнее
Номер записи: 93
29-01-2015 дата публикации

PRECODING LOSS REDUCTION

Номер: US20150030062A1
Автор: Kossel Marcel A., Lim Daihyun, Thiagarajan Pradeep
Принадлежит: INTERNATIONAL BUSINESS MACHINES CORPORATION

An apparatus for encoding data signals includes a transmitter configured to encode and transmit a data signal over a communication channel, the transmitter including a precoder; a signal shaper configured to adjust the data signal by applying an equalization setting to the data signal, the equalization setting including an amplitude and offset and transmit the adjusted data signal to the precoder; and a processing unit. The processing unit is configured to perform: receiving channel coefficients associated with the communication channel; for each of a plurality of amplitude settings and a plurality of offset settings, calculating whether a modulo amplitude level would occur at a receiver using a modulo operation; selecting the equalization setting from the plurality of amplitude settings and the plurality of offset settings based on the calculation; and transmitting a control signal specifying the equalization setting to the signal shaper.

Подробнее
Номер записи: 94
10-02-2022 дата публикации

SYSTEM AND METHOD FOR DYNAMIC ELEMENT MATCHING FOR DELTA SIGMA CONVERTERS

Номер: US20220045693A1
Автор: BANDYOPADHYAY Abhishek, BIRDSONG Preston S., SPIRER Adam R.
Принадлежит: ANALOG DEVICES, INC.

Systems and methods for improving the efficiency of a rotational dynamic element matching (DEM) for Delta Sigma converters. In some implementations, the systems and methods are provided a for reducing intersymbol interference (ISI) of a Delta Sigma converter. A delta sigma converter architecture can include multiple I-DACs, and the output from each I-DAC can vary from the other I-DACs. Techniques are disclosed for decreasing mismatch among multiple I-DACs while improving efficiency of rotational dynamic element matching. 1. A system for rotational dynamic element matching in a delta sigma converter , comprising:a rotational dynamic element matching (DEM) component configured to receive a data signal, wherein the rotational DEM component has a plurality of elements, a start pointer, and a current pointer;wherein the current pointer shifts in a first direction when the data signal is positive and wherein the current pointer shifts in an opposite direction when the data signal is negative.2. The system of claim 1 , wherein the rotational DEM component is a barrel shifter claim 1 , and wherein the current pointer shifts circularly.3. The system of claim 2 , wherein the first direction is clockwise and the opposite direction is counterclockwise.4. The system of claim 2 , wherein the first direction is counterclockwise and the opposite direction is clockwise.5. The system of claim 1 , wherein a last element used when the data signal is positive is a first element used when the data signal is negative.6. The system of claim 1 , wherein a last element used when the data signal is negative is a first element used when the data signal is positive.7. The system of claim 1 , further comprising a current digital to analog converter configured to convert a rotational DEM component output into an analog signal.8. The system of claim 7 , wherein the current digital to analog converter is one of a 2-level current mode digital to analog converter and a 3-level current mode digital to ...

Подробнее
Номер записи: 95
10-02-2022 дата публикации

TRAINING SEQUENCE TRANSMISSION METHOD AND APPARATUS

Номер: US20220045815A1
Автор: Hu Yinliang, Yang Bo, YUAN Fangchao
Принадлежит: Huawei Technologies CO.,Ltd.

This application provides a training sequence transmission method and apparatus. The method includes: A first AP broadcasts a trigger frame, where the trigger frame indicates a time sequence of separately sending channel sounding frames by N STAs, and N is an integer greater than 1. The first AP receives the channel sounding frames sequentially sent by the N STAs, where one channel sounding frame includes one or more training sequences. In this solution, only one trigger frame needs to be sent, so that the N STAs can be triggered to separately report channel sounding frames to M+1 APs. However, in the conventional technology, each AP needs to send one channel training request to each STA, that is, N×(M+1) channel training requests are sent in total, to trigger each STA to report a training sequence. Therefore, this solution can significantly reduce signaling overheads. 1. A training sequence transmission method , comprising:receiving, by a first station (STA), a trigger frame broadcast by a first access point (AP), wherein the trigger frame indicates a time sequence of separately sending channel sounding frames by N STAs, the N STAs comprise the first STA, and N is an integer greater than 1;constructing, by the first STA, a first channel sounding frame based on a quantity of training sequences corresponding to the first STA, wherein the first channel sounding frame comprises one or more training sequences;determining, by the first STA, a first time point for sending the first channel sounding frame based on the time sequence; andsending, by the first STA, the first channel sounding frame at the first time point.2. The method according to claim 1 , wherein the determining claim 1 , by the first STA claim 1 , the first time point for sending the first channel sounding frame comprises:determining, by the first STA, a second STA based on the time sequence of separately sending the channel sounding frames by the N STAs, wherein a time of sending a second channel sounding ...

Подробнее
Номер записи: 96
10-02-2022 дата публикации

Serial-Link Receiver Using Time-Interleaved Discrete Time Gain

Номер: US20220045885A1
Автор: Boecker Charles Walter, Hossain Masum, Lin Haidang
Принадлежит:

A serial receiver combines continuous-time equalization, analog interleaving, and discrete-time gain for rapid, efficient data reception and quantization of a serial, continuous-time signal. A continuous-time equalizer equalizes a received signal. A number N of time-interleaved analog samplers sample the equalized continuous-time signal to provide N streams of analog samples transitioning at rate reduced by 1/N relative to the received signal. A set of N discrete-time variable-gain amplifiers amplify respective streams of analog samples. A quantizer then quantizes the amplified streams of analog samples to produce a digital signal. 1. (canceled)2. A receiver comprising:N analog samplers each coupled to a common node to sample a continuous-time signal conveyed at a symbol rate, thereby providing N series of analog samples each conveyed at a sample rate lower than the symbol rate; and a discrete-time amplifier coupled to an output of the analog sampler to amplify the respective series of analog samples, thereby providing an amplified series of analog samples; and', 'a quantizer coupled to an output of the discrete-time amplifier to quantize the respective amplified series of analog samples., 'for each of the N analog samplers3. The receiver of claim 2 , each of the discrete-time amplifiers including:a transistor having:a control terminal coupled to the output of the analog sampler;a first current-handling terminal; anda second current-handling terminal; anda first switching element to selectively connect the first current-handling terminal to the quantizer.4. The receiver of claim 3 , each of the discrete-time amplifiers further including a capacitor connected between the switching element and a power-supply terminal.5. The receiver of claim 4 , each of the discrete-time amplifiers further including a second switching element connected in parallel with the capacitor claim 4 , the second switching element to selectively discharge the capacitor.6. The receiver of claim ...

Подробнее
Номер записи: 97
24-01-2019 дата публикации

MICROWAVE BACKHAUL SYSTEM HAVING QUADRUPLE CAPACITY

Номер: US20190028258A1
Автор: STURKOVICH Kobi
Принадлежит:

A microwave backhaul system having quadruple capacity. In one embodiment, an outdoor communication unit in a microwave backhaul system is provided, which includes a first and second dual channel processing modules that are each configured to process two transmission/reception channels. The outdoor communication unit also includes two transmitter modules that are each configured to upconvert two channels for transmission at vertical polarization and a horizontal polarization. 110-. (canceled)11. A system comprising:a first dual channel processing circuit configured to process a first channel and a second channel carried over a first cable;a second dual channel processing circuit configured to process a third channel and a fourth channel carried over a second cable;a first transmitter configured to receive a first analog baseband signal from the first dual channel processing circuit, wherein the first analog baseband signal comprises the first channel and the second channel, and wherein the first transmitter is configured to upconvert the first channel and the second channel for transmission at a first polarization; anda second transmitter configured to receive a second analog baseband signal from the second dual channel processing circuit, wherein the second analog baseband signal comprises the third channel and the fourth channel, and wherein the second transmitter is configured to upconvert the third channel and the fourth channel for transmission at a second polarization different from the first polarization.12. The system of claim 11 , wherein the first dual channel processing circuit and the second dual channel processing circuit are implemented on separate digital chip substrates.13. The system of claim 11 , wherein the first transmitter and the second transmitter are implemented on separate digital chip substrates.14. The system of claim 11 , wherein the system comprises:a first receiver configured to receive a third signal, wherein the third signal comprises ...

Подробнее
Номер записи: 98
24-01-2019 дата публикации

METHODS AND SYSTEMS FOR HIGH BANDWIDTH COMMUNICATIONS INTERFACE

Номер: US20190028308A1
Автор: FOX JOHN, Holden Brian, Hormati Ali, Hunt Peter, Keay John D., Shokrollahi Amin, Simpson Richard, Singh Anant, Stewart Andrew Kevin John, Surace Giuseppe, Ulrich Roger
Принадлежит:

A pair of ground planes arranged in parallel, a dielectric medium disposed in between the pair of ground planes, and a set of at least four signal conductors disposed in the dielectric medium, the set of at least four signal conductors having (i) a first pair of signal conductors arranged proximate to a first ground plane of the pair of ground planes and (ii) a second pair of signal conductors arranged proximate to a second ground plane of the pair of ground planes, each signal conductor of the set of at least four signal conductors configured to carry a respective signal corresponding to a symbol of a codeword of a vector signaling code. 1. An apparatus comprising:a pair of ground planes arranged in parallel;a dielectric medium disposed in between the pair of ground planes; anda set of at least four signal conductors disposed in the dielectric medium, the set of at least four signal conductors comprising (i) a first pair of signal conductors arranged proximate to a first ground plane of the pair of ground planes and (ii) a second pair of signal conductors arranged proximate to a second ground plane of the pair of ground planes, each signal conductor of the set of at least four signal conductors configured to carry a respective signal corresponding to a symbol of a codeword of a vector signaling code.2. The apparatus of claim 1 , further comprising conductive vias connecting the pair of ground planes.3. The apparatus of claim 1 , wherein signal conductors in the first and second pairs of signal conductors are equidistant from each other.4. The apparatus of claim 1 , wherein the first pair of signal conductors has a periodic offset along a length of the dielectric medium with respect to the second pair of signal conductors.5. The apparatus of claim 1 , wherein the vector signaling code comprises all permutations of {+1 claim 1 , −⅓ claim 1 , −⅓ claim 1 , −⅓} and {−1 claim 1 , ⅓ claim 1 , ⅓ claim 1 , ⅓}.6. A method comprisingobtaining a plurality of signals via a ...

Подробнее
Номер записи: 99
24-01-2019 дата публикации

SYSTEMS AND METHODS FOR PROVIDING RESOURCE SIGNALING WITHIN A WIRELESS LOCAL AREA NETWORK (WLAN)

Номер: US20190029027A1
Автор: Sun Yakun, Zhang Hongyuan
Принадлежит:

Embodiments described herein provide a method for resource unit signaling with reduced data bits in a wireless local area network. At a wireless transceiver, a data frame may be obtained for transmission. The data frame includes a first preamble portion and a second preamble portion compliant with a wireless local area network communication protocol. When an available resource unit for transmitting the data frame is less than an allowed bandwidth, the first preamble portion and the second preamble portion may be configured with resource unit signaling bits. When the available resource unit is greater than or equal to the allowed bandwidth, the resource unit may be virtually divided into a plurality of channels. At least one of the first preamble portion and the second preamble portion may be configured with a first number of bits representing a number of users spatially multiplexed on a channel from the plurality of channels 120-. (canceled)21. A method for providing resource unit signaling with reduced data bits in a wireless local area network , the method comprising:determining whether a resource unit for transmitting a data frame is greater than an allowed bandwidth; virtually dividing the resource unit into a plurality of channels;', 'for each channel from the plurality of channels, configuring a SIGB portion of the data frame to indicate a subset of client stations spatially multiplexed on the respective channel; and, 'when the resource unit is greater than or equal to the allowed bandwidthtransmitting the data frame including the configured SIGB portion.22. The method of claim 21 , further comprising:evenly distributing a set of spatially multiplexed client stations into each channel of the plurality of channels.23. The method of claim 22 , further comprising:for each channel, allocating a subset of consecutively indexed client stations to the respective channel.24. The method of claim 22 , further comprising:allocating one client station to a channel from ...

Подробнее
Номер записи: 100