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Небесная энциклопедия

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

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Мониторинг СМИ

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

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05-01-2012 дата публикации

Method and a device for determining a shifting parameter to be used by a telecommunication device for transferring symbols

Номер: US20120002629A1

Автор: Cristina Ciochina, Damien Castelain, David Mottier, Loic Brunel

Принадлежит: Mitsubishi Electric Corp

A method for determining a shifting parameter P to be used by a telecommunication device for mapping symbols on sub-carriers, the telecommunication device including at least two transmit antennas, the symbols being transferred through each antenna of the telecommunication device on at least an even number K, strictly greater than two, of sub-carriers allocated to the telecommunication device. The telecommunication device transfers on a first antenna on each sub-carrier ‘k’, a signal representing a symbol ‘X k ’ in the frequency domain. The telecommunication device transfers on a second antenna on each sub-carrier ‘k’, a signal representing a symbol ‘X′ k ’ derived from the signal transferred on the first transmit antenna, for each frequency k, by the formula X K secondAnt =ε(−1) k+1 X* (p-l-k)mod K . Sub-carriers grouped in at least two clusters are allocated to the telecommunication device, and the shifting parameter p is even and determined according to clusters of sub-carriers allocated to the telecommunication device.

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Номер записи: 1

05-01-2012 дата публикации

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

Номер: US20120002658A1

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

Принадлежит: Huawei Technologies Co Ltd

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

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Номер записи: 2

05-01-2012 дата публикации

Method and apparatus for encoding feedback signal

Номер: US20120002749A1

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

Принадлежит: Huawei Technologies Co Ltd

A method and apparatus for encoding feedback signal is provided. The method includes: encoding feedback signals of three carriers to output a bit sequence; and transmitting the bit sequence on a High Speed-Dedicated Physical Control Channel (HS-DPCCH). The encoding the feedback signals of the three carriers may specifically include: mapping the feedback signals of the three carriers into a codeword, in which the codeword can be selected from a codebook, and codewords in the codebook satisfy a particular code distance relationship. The method for jointly encoding feedback signals of three carriers in a Ternary Cell (TC) mode is provided. Feedback signals are transmitted over a single code channel. Therefore, power overhead is reduced, and system performance is improved.

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Номер записи: 3

12-01-2012 дата публикации

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

Номер: US20120008609A1

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

Принадлежит: Huawei Technologies Co Ltd

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

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Номер записи: 4

19-01-2012 дата публикации

Wireless transmission apparatus and precoding method

Номер: US20120014279A1

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

Принадлежит: Panasonic Corp

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

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Номер записи: 5

19-01-2012 дата публикации

Wireless communication system, device and method

Номер: US20120014469A1

Автор: Liang Zhou

Принадлежит: Fujitsu Ltd

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

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Номер записи: 6

19-01-2012 дата публикации

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

Номер: US20120014477A1

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

Принадлежит: LG ELECTRONICS INC

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

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Номер записи: 7

26-01-2012 дата публикации

Systems and methods for pucch feedback in 3gpp wireless networks

Номер: US20120020288A1

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

Принадлежит: SAMSUNG ELECTRONICS CO LTD

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

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Номер записи: 8

26-01-2012 дата публикации

Orthogonal resource reuse with sdma beams

Номер: US20120020316A1

Автор: Alexei Gorokhov, Min Dong, Tingfang JI

Принадлежит: Qualcomm Inc

A wireless communication system can implement beamforming across multiple omni-directional antennas to create beams at different spatial directions. The communication system can arrange the beams in sets, with each set arranged to provide substantially complete coverage over a predetermined coverage area. The communication system can arrange the multiple SDMA beam sets to support substantially complementary coverage areas, such that a main beam from a first set provides coverage to a weak coverage area of the second beam set. The wireless communication system assigns or otherwise allocates substantially orthogonal resources to each of the beam sets. The wireless communication system allocates resources to a communication link using a combination of beam sets and substantially orthogonal resources in order to provide improved coverage without a corresponding increase in interference.

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Номер записи: 9

26-01-2012 дата публикации

Communication device and communication method, computer program, and communication system

Номер: US20120020420A1

Автор: Hiroaki Takano, Kazuyuki Sakoda, Ryo Sawai, Ryota Kimura, Takushi Kunihiro, Yuichi Morioka

Принадлежит: Sony Corp

Suitable beam pattern control is performed while performing access control based on physical carrier sense. A communication device transmits frames having a long preamble under a state where signals will not reach unless a beam pattern is formed, thereby enabling access control based on physical carrier sense, and under a state where signals will sufficiently reach without a beam pattern being formed transmits frames having a shorter preamble, thereby suppressing transmission overhead. Also, a beam pattern and preamble type are decided based on transmission/reception history of access control following CSMA/CA procedures.

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Номер записи: 10

26-01-2012 дата публикации

Transmission using common and dedicated pilots

Номер: US20120020434A1

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

Принадлежит: ROCKSTAR BIDCO LP

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

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Номер записи: 11

02-02-2012 дата публикации

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

Номер: US20120026909A1

Автор: Yong Ho Seok

Принадлежит: LG ELECTRONICS INC

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

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Номер записи: 12

02-02-2012 дата публикации

Link layer multicasting systems and methods

Номер: US20120027117A1

Автор: Karthik Sundaresan, Mohammad A. Khajehnejad, Mohammad A. Khojastepour, Sampath Rangarajan

Принадлежит: NEC Laboratories America Inc

Beamforming systems and methods are disclosed. In accordance with one method, indications of channel matrices for a plurality of receivers are obtained. Further, a beamformer matrix is formulated as a linear combination of columns of hermitians of the channel matrices. In addition, coefficients of the hermitians in the linear combination are determined to compute the beamformer matrix such that a lowest reception rate among reception rates of each of the receivers is maximized. Data signals are transmitted to the receivers by applying the computed beamformer matrix to data symbols to maximize the lowest reception rate.

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Номер записи: 13

09-02-2012 дата публикации

Base station apparatus and information transmission method

Номер: US20120033625A1

Автор: Kazuaki Takeda, Mamoru Sawahashi, Nobuhiko Miki, Satoshi Nagata, Yoshihisa Kishiyama

Принадлежит: NTT DOCOMO INC

To improve the frequency diversity effect and enhance reception quality characteristics in a mobile terminal apparatus even when the system bandwidth is extended, provided are a base station apparatus which assigns transmission data to each user to a single or plurality of group bands among group bands configured by dividing a system band into a plurality of bands, and transmits the transmission data assigned to the group bands on downlink, and a mobile terminal apparatus which receives the transmission data assigned to the group bands.

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Номер записи: 14

09-02-2012 дата публикации

System and method for synthetic voice generation and modification

Номер: US20120035933A1

Автор: Alistair D. Conkie, Ann K. Syrdal

Принадлежит: AT&T INTELLECTUAL PROPERTY I LP

Disclosed herein are systems, methods, and non-transitory computer-readable storage media for generating a synthetic voice. A system configured to practice the method combines a first database of a first text-to-speech voice and a second database of a second text-to-speech voice to generate a combined database, selects from the combined database, based on a policy, voice units of a phonetic category for the synthetic voice to yield selected voice units, and synthesizes speech based on the selected voice units. The system can synthesize speech without parameterizing the first text-to-speech voice and the second text-to-speech voice. A policy can define, for a particular phonetic category, from which text-to-speech voice to select voice units. The combined database can include multiple text-to-speech voices from different speakers. The combined database can include voices of a single speaker speaking in different styles. The combined database can include voices of different languages.

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Номер записи: 15

16-02-2012 дата публикации

Method for uplink transmission of data from a user terminal, a base station, a coordination device, and a communication network therefor

Номер: US20120039208A1

Автор: Osman Aydin

Принадлежит: Alcatel Lucent SAS

The invention concerns a method for uplink transmission of data from a user terminal (UE), wherein the data are received by base stations (eNB 1 , eNB 2 , eNB 3 ) on a wireless interface, at least one of said base stations (eNB 2 , eNB 3 ) determines a quality of the received data on at least one processing level, the at least one of said base stations (eNB 2 , eNB 3 ) determines a respective dedicated processing level of the data that will be used for sending the data to a coordinating device (eNB 1 ) based on said at least one quality, the at least one of said base stations (eNB 2 , eNB 3 ) sends the data to the coordinating device (eNB 1 ) on the respective dedicated processing level, and the coordinating device (eNB 1 ) determines decoded data by means of the data, a base station, a coordinating device, and a communication network therefor.

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Номер записи: 16

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.

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Номер записи: 17

16-02-2012 дата публикации

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

Номер: US20120039412A1

Автор: Juan Montojo, Peter Gaal, Stefan Geirhofer

Принадлежит: Qualcomm Inc

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

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Номер записи: 18

16-02-2012 дата публикации

Method for reporting channel state information, method for channel estimation, terminal device, and base station

Номер: US20120040622A1

Автор: Lei Wan, Xiaotao Ren, Zhiyu Yan

Принадлежит: Huawei Technologies Co Ltd

A method for reporting channel state information includes: obtaining channel state information of a described object; and feeding back the obtained channel state information to a base station in a comb manner. A method for channel estimation includes: receiving channel state information that is reported by a terminal in a comb manner; and determining, according to the channel state information that is reported in the comb manner, channel state information corresponding to a described object that does not report channel state information.

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Номер записи: 19

23-02-2012 дата публикации

Communication system, apparatus and method for antenna array control

Номер: US20120044917A1

Автор: Conor O'keeffe

Принадлежит: Socowave Technologies Ltd

A wireless communication system comprises a network element ( 315 ) operably coupled to an antenna array for communicating with a remote wireless communication unit ( 305 ). The antenna array comprises a plurality of radiating elements where at least one first radiating element of the plurality of radiating elements is arranged to create a radiation pattern that comprises a sector beam ( 405 ). The plurality of radiating elements comprises at least one second radiating element arranged to create a major portion of at least one sub-sector beam ( 420, 425, 430 ) within the sector beam ( 405 ).

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Номер записи: 20

23-02-2012 дата публикации

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

Номер: US20120044925A1

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

Принадлежит: LG ELECTRONICS INC

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

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Номер записи: 21

23-02-2012 дата публикации

Communication apparatus, base station and coordinated multipoint communication method

Номер: US20120044978A1

Автор: Hua Zhou, Jian Wang, Jianming Wu, Jie Zhang, Jun Tian

Принадлежит: Fujitsu Ltd

The communication apparatus includes: a channel estimating unit for acquiring a channel estimation value of a channel between the communication apparatus and a cell base station of a cell in which the communication apparatus is located; a transmitter transmitting the channel estimation value or information based on the channel estimation value to the cell base station; a receiver receiving coordinated multipoint (CoMP) message from the cell base station, the CoMP message indicates the CoMP transmission mode, the codebook or precoding matrix used by the cell base station, and the codebook or precoding matrix used by a coordinated base station that coordinates with the cell base station; a channel matrix forming unit for acquiring a channel matrix according to the CoMP message; and a decoder decoding received signals according to the channel matrix and the CoMP message.

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Номер записи: 22

23-02-2012 дата публикации

Interference suppression wireless communication system and interference suppression wireless communication device

Номер: US20120045995A1

Автор: Hiroshi Nakano, Kozue Hirata, Minoru Kubota, Takashi Onodera

Принадлежит: Individual

An interference suppression wireless communication device to be used in an interference suppression wireless communication system, includes: a variance acquirer configured to acquire a variance of channel estimation errors associated with a channel for a transmission signal of the interference suppression wireless communication device, a variance of channel estimation errors associated with a channel for an interference signal, and a variance of noise included in the transmission signal when the transmission signal is received; and a coefficient calculator configured to calculate, based on the variances acquired by the variance acquirer, a coefficient by which the interference signal to be subtracted from the transmission signal is multiplied.

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Номер записи: 23

01-03-2012 дата публикации

Antenna device, communication system, base station device, and communication method

Номер: US20120051302A1

Автор: Hiroyuki Seki

Принадлежит: Fujitsu Ltd

An antenna device connected to a base station device via a cascade connection, includes a first receiver that receives, from the base station device, subband information specifying a subband that is among a plurality of subbands obtained by dividing a frequency band and is not assigned to a mobile station device, a second receiver that receives, from another antenna device connected on a downstream side of the cascade connection, an upstream link signal transmitted by the mobile station device and received by the other antenna device and reception quality information of the upstream link signal, a wireless receiver that receives a wireless upstream link signal transmitted by the mobile station device, and a comparator that compares quality of the wireless upstream link signal with the reception quality information based on power of the wireless upstream link signal and power of a received signal in the subband.

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Номер записи: 24

01-03-2012 дата публикации

Precoding with reduced feedback for coordinated multipoint transmission on the downlink

Номер: US20120051450A1

Автор: Kambiz Zangi

Принадлежит: Individual

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

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Номер записи: 25

08-03-2012 дата публикации

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

Номер: US20120057510A1

Автор: Dinh Thuy Phan Huy, Jean-Marie Chaufray

Принадлежит: France Telecom SA

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

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Номер записи: 26

08-03-2012 дата публикации

MIMO OFDM System

Номер: US20120057661A1

Автор: Jack Harriman Winters, Nelson Ray Sollenberger, Ye Li

Принадлежит: AT&T Corp

A MIMO OFDM system includes a plurality of space-time encoders for encoding respective data blocks with independent space-time codes. The transformed data block signals are transmitted by a plurality of transmit antennas and received by a plurality of receive antennas. The received data is pre-whitened prior to maximum likelihood detection. In one embodiment, successive interference cancellation can be sued to improve system performance. Channel parameter estimation can be enhanced by weighting the channel impulse response estimates based upon a deviation from average.

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Номер записи: 27

15-03-2012 дата публикации

Methods and apparatus for best-effort radio backhaul among cells on unlicensed or shared spectrum

Номер: US20120063383A1

Автор: Alan Barbieri, Naga Bhushan, Peter Gaal

Принадлежит: Qualcomm Inc

Methods and apparatus for wireless communication are described. A first base station may provide first backhaul information using a shared channel to a second base station. The shared channel may be white space channels, Authorized Shared Multiuser (ASM) channels or an Instrumentation, Scientific, and Measurement (ISM) channels. The first base station may further provide second backhaul information using a legacy backhaul channel.

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Номер записи: 28

15-03-2012 дата публикации

System and Method for Channel State Information Feedback in Wireless Communications Systems

Номер: US20120063500A1

Автор: David Mazzarese, Jianguo Wang, Mattias Frenne, YANG Tang, Yongxing Zhou

Принадлежит: FutureWei Technologies Inc

A system and method for channel state information feedback in wireless communications systems are provided. A method for reporting channel information includes determining, at a user equipment, a channel information type for first channel information to be reported to a communications controller, determining the first channel information conditioned on previously reported channel information and on the channel information type, and reporting the first channel information, the channel information type, or a combination thereof, to the communications controller.

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Номер записи: 29

22-03-2012 дата публикации

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

Номер: US20120069919A1

Автор: BRUNO Clerckx, Goo Chul Chung, Yongxing Zhou

Принадлежит: SAMSUNG ELECTRONICS CO LTD

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

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Номер записи: 30

22-03-2012 дата публикации

Method and apparatus for feedback in closed loop transmitting

Номер: US20120069925A1

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

Принадлежит: MOTOROLA MOBILITY LLC

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

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Номер записи: 31

29-03-2012 дата публикации

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

Номер: US20120076223A1

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

Принадлежит: Broadcom Corp

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

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Номер записи: 32

05-04-2012 дата публикации

Apparatus and method for controlling a wireless feeder network

Номер: US20120082061A1

Автор: Andrew Logothetis, Martin Lysejko

Принадлежит: Airspan Networks Inc

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

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Номер записи: 33

05-04-2012 дата публикации

Cooperative communication method and base station

Номер: US20120082118A1

Автор: Yi Long, Yunbo Li

Принадлежит: Huawei Technologies Co Ltd

A cooperative communications method for a wireless network and a corresponding apparatus. In one embodiment, the method includes: obtaining a matrix corresponding to a destination Mobile Station (MS), where the number of rows of the matrix depends on the total number of antennas of MSs in a cooperative area and the number of antennas of the destination MS, and the number of columns of the matrix depends on the number of code streams sent to the destination MS; calculating a precoding matrix according to local Channel State Information (CSI) and the matrix; performing precoding according to the precoding matrix; and performing cooperative communication according to a result of the precoding. The method of this embodiment enables the reduction or elimination of interference between users by specifying a direction matrix, and is applicable to multi-antenna MSs. A cooperative base station (BS) applicable to the foregoing method is also disclosed.

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Номер записи: 34

05-04-2012 дата публикации

Pmi feedback with codebook interpolation

Номер: US20120082190A1

Автор: Qinghua Li, Xiaogang Chen, Yuan Zhu

Принадлежит: Intel Corp

Various embodiments of this disclosure may describe apparatuses, methods, and systems for interpolation of precoding matrixes to increase feedback accuracy of the channel state information (CSI) feedback in a wireless communication network. Other embodiments may also be disclosed or claimed.

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Номер записи: 35

05-04-2012 дата публикации

Tomlinson harashima precoding with additional receiver processing in a multi-user multiple-input multiple-output wireless transmission system

Номер: US20120082256A1

Автор: Joydeep Acharya, Sudhanshu Gaur

Принадлежит: HITACHI LTD

A method for processing user symbols with Tomlinson Harashima precoder (THP) in a base station, of a wireless system having K user terminals (UEs) which communicate with the base station via an uplink channel and corresponding downlink (DL) channel, comprises estimating a DL channel matrix H k ; determining receiver processing matrix V k ; computing an effective matrix DL channel H eff ; performing QR decomposition of H eff ; computing THP matrices; calculating scalar weights for the UEs; processing user symbols by the THP having the THP matrices to produce an output of filtered vector symbols for the UEs; directing output of the THP to the channel represented by the DL channel matrix through which communications occur in the wireless system with the UEs; performing additional receiver processing on the transmitted signals at the UEs based on V k for each of the K UEs; and using the scalar weights on the transmitted signals at the UEs.

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Номер записи: 36

05-04-2012 дата публикации

Orthogonal Resource Selection Transmit Diversity

Номер: US20120082263A1

Автор: Masoud Ebrahimi Tazeh Mahalleh, Robert Mark Harrison, Yongkang Jia, Youn Hyoung Heo

Принадлежит: Research in Motion Ltd

Methods are disclosed for transmitting a plurality of information bits using resource selection on multiple antennas. In one or more embodiments, the methods include: selecting a first and a second orthogonal resource from an allocation of more than two orthogonal resources according to the state of the plurality of information bits; transmitting a first symbol in a first symbol instant on a first antenna using the first orthogonal resource; and transmitting a second symbol in the first symbol instant on a second antenna using the second orthogonal resource. In some embodiments, the first and second orthogonal resources are different and the first symbol is either a reference symbol or a modulation symbol.

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Номер записи: 37

12-04-2012 дата публикации

Method for generating codebook, method and apparatus for data transmission

Номер: US20120087422A1

Автор: Weijun SUN, Yongxing Zhou

Принадлежит: Huawei Technologies Co Ltd

A method for generating a codebook and a method and an apparatus for data transmission are provided. The method includes: receiving a label of a codeword sent by a User Equipment (UE); selecting the codeword identified by the label from the codebook for eight-antenna; and coding data to be sent by using the codeword. The codebook for eight-antenna includes at least one rank-8 codeword for eight-antenna. The rank-8 codeword for eight-antenna is generated by multiplying an inverse matrix of a rotation matrix for eight-antenna with an eight-dimensional matrix formed by rank-4 codewords for four-antenna; or generated by extending rank-4 codewords for eight-antenna, where the rank-4 codeword for eight-antenna is generated according to codewords for four-antenna. Therefore, the codeword in the codebook for eight-antenna is applicable to scenarios including dual-polarization strong correlation, dual-polarization weak correlation, single-polarization strong correlation, and single-polarization weak correlation, etc.

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Номер записи: 38

12-04-2012 дата публикации

Multi-cell cooperative communication system and terminal device

Номер: US20120087423A1

Автор: Heesoo Lee, Jae Heung Kim, Jae Young Ahn, Young Jo Ko

Принадлежит: Electronics and Telecommunications Research Institute ETRI

Disclosed is a data transmission system that transmits data by using relay. The relay may select a transmission terminal from among a plurality of terminals accessing a base station. The base station may transmit base station data to the relay during a first time slot, the transmission terminal may transmit terminal data to the relay. The relay may transmit the terminal data to the base station and may transmit the base station data to the transmission terminal during a second time slot.

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Номер записи: 39

19-04-2012 дата публикации

Method and apparatus for data transmission based on distributed discrete power control in cooperative multi-user multi-input multi-output system

Номер: US20120093250A1

Автор: Byoung-Hoon Kim, Dong-Uk Lee, Jaewon Chang, Jaewon Kim, Jun-Ho Jo, Ki Jun Kim, Wonjin Sung

Принадлежит: Industry University Cooperation Foundation of Sogang University, LG ELECTRONICS INC

Disclosed are a method and apparatus capable of enhancing a closed loop multi-input multi-output (MIMO) capacity through distributed discrete power control in the case of cooperatively transmitting information to multiple users through a downlink.

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Номер записи: 40

26-04-2012 дата публикации

Transitioning from mimo to siso to save power

Номер: US20120099497A1

Автор: Harish Vaidya, Manoj Raveendranath Kamath, Rakesh Raman

Принадлежит: Broadcom Corp

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

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Номер записи: 41

26-04-2012 дата публикации

Enhanced Inter-Network Access Node Scheduling Coordination And Signaling Support For Advanced Receiver Algorithms

Номер: US20120099544A1

Автор: Esa Tapani Tiirola, Kari Juhani Hooli, Kari Pekka Pajukoski, Lars Lindh, Marko Lampinen, Tommi Koivisto

Принадлежит: Nokia Oyj, NOKIA SIEMENS NETWORKS OY

A method includes operating a network access node to determine, in cooperation with at least one other network access node, a coordinated scheduling granularity having a plurality of physical resource blocks; and signaling an indication of the determined coordinated scheduling granularity to at least one mobile device served by the network access node for use in enhancing estimation at a receiver of the mobile device, such as when estimating an interference covariance matrix. Apparatus for performing the method is also disclosed, as are mobile device methods and apparatus for receiving and using the signaling.

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Номер записи: 42

03-05-2012 дата публикации

Method and apparatus for communication with shortened signal formats

Номер: US20120106372A1

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

Принадлежит: Qualcomm Inc

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

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Номер записи: 43

03-05-2012 дата публикации

Methods and systems for enabling feedback in wireless communication networks

Номер: US20120106483A1

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

Принадлежит: ROCKSTAR BIDCO LP

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

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Номер записи: 44

03-05-2012 дата публикации

Radio communication system, radio communication method, and radio communication device

Номер: US20120106519A1

Автор: Takaaki Kishigami, Yoichi Nakagawa

Принадлежит: Panasonic Corp

In the environment of a communication area including a SDM-compatible mobile station for space division multiplex transmission and a SDM-uncompatible mobile station not compatible with space division multiplex transmission, a base station having a plurality of antennas and capable of adaptively changing directivity performs allocation of a mobile station which simultaneously performs space division multiplex transmission (SDM) and space division multiplex access (SDMA) by using a predetermined space division multiplex transmission evaluation criterion and a space division multi access evaluation criterion. By using this radio communication method, it is possible to use the spatial degree of freedom at its maximum and provide a radio communication system having an improved communication capacity.

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Номер записи: 45

03-05-2012 дата публикации

Method and apparatus for indicating destination stations in wlan system supporting multi-user multiple input multiple output

Номер: US20120106531A1

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

Принадлежит: LG ELECTRONICS INC

A method of indicating destination stations, performed by an access point (AP), in a wireless local area network (WLAN) system supporting multi-user multiple input multiple output (MU-MIMO) is provided. The method includes transmitting a sounding request frame to the plurality of destination stations to transmit a sounding frame used for channel estimation between the AP and each destination station, receiving the sounding frame in response to the sounding frame request from each station, and transmitting a first data frame spatially multiplexed with respect to the plurality of destination stations by performing channel estimation on the basis of the sounding frame, wherein the sounding request frame comprises a group identifier (ID) indicating the plurality of destination stations.

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Номер записи: 46

10-05-2012 дата публикации

Method and apparatus for interference cancellation and detection using precoders

Номер: US20120114056A1

Автор: Feng Li, Hamid Jafarkhani

Принадлежит: UNIVERSITY OF CALIFORNIA

A method to achieve full diversity without sacrificing bandwidth and with a linear complexity in a wireless system includes the steps of orthogonally transmitting a plurality of signals utilizing multiple antennas using a corresponding plurality of precoders in a plurality of time slots, which precoders are designed using the channel information to cancel interference among the plurality of signals while achieving a maximum possible diversity of NM with low complexity for at least two users each having N transmit antennas and one receiver with M receive antennas, separating the signals in the receiver using the orthogonality of the transmitted signals, and decoding the signals independently to provide full diversity to the at least two users.

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Номер записи: 47

10-05-2012 дата публикации

Successive transmit beamforming methods for multiple-antenna orthogonal frequency division multiplexing (ofdm) systems

Номер: US20120114072A1

Автор: Hamid Jafarkhani, Li Liu

Принадлежит: UNIVERSITY OF CALIFORNIA

An improvement in a method of transmit beamforming between a transmitter and a receiver in an OFDM wireless system having a plurality of subcarriers for a time varying fading channel comprises performing successive beamforming for each of the plurality of subcarriers using less than complete knowledge of the previous fading blocks for the subcarriers by beamforming an adaptive codebook, C=(C 1 ; . . . ; c 2 N }, of a current fading block for the subcarriers by correlating inter-frame and/or inter-subcarrier signals among the plurality of subcarriers.

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Номер записи: 48

10-05-2012 дата публикации

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

Номер: US20120115427A1

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

Принадлежит: Individual

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

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Номер записи: 49

17-05-2012 дата публикации

Wireless communication device and wireless communication method

Номер: US20120120907A1

Автор: Takaaki Kishigami

Принадлежит: Panasonic Corp

A bias of reception qualities between spatial streams to a plurality of terminal devices is suppressed in a multiuser MIMO transmission. A wireless communication device according to the invention is one for performing a spatial multiplexing transmission to the plurality of terminal devices, that includes an additional data area setting section that allocates, as an additional data area, a part of a resource allocation area to which no data addressed to each terminal device of the plurality of terminal devices is allocated among resource allocation areas for the spatial multiplexing transmission which are allocated to each terminal device of the plurality of terminal devices, an additional data generator that generates additional data corresponding to the additional data area allocated by the additional data area setting section, and a transmitter that transmits the data which is addressed to each of the plurality of terminal devices and the additional data.

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Номер записи: 50

17-05-2012 дата публикации

Method and Apparatus for Assigning Resources in a Wireless System with Multiple Regions

Номер: US20120120912A1

Автор: Anthony C. K. Soong, JIANMIN Lu, Sean Michael McBeath, Yunsong Yang

Принадлежит: FutureWei Technologies Inc

A method and apparatus of signaling radio resource allocation in a wireless communication system includes transmitting at least one region boundary to a mobile station indicating a division of the time-frequency resources into at least two regions, determining a time-frequency resource assignment for the mobile station, transmitting an indication of the determined time-frequency resource to the mobile station in the same region as the determined time-frequency resource, and transmitting a packet to the mobile station using the physical time-frequency resources corresponding to the determined time-frequency resource.

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Номер записи: 51

17-05-2012 дата публикации

Packet processing systems and methods

Номер: US20120120935A1

Автор: Mark A. Webster, Michael J. Seals

Принадлежит: Individual

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

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Номер записи: 52

17-05-2012 дата публикации

Method and Device for Coordinated Scheduling

Номер: US20120122468A1

Автор: Deshan Miao, Hao He, Qiubin Gao, Shaohui Sun, Ying Peng

Принадлежит: China Academy of Telecommunications Technology CATT

Disclosed in the present invention is a coordinated scheduling method which includes that: a base station establishes the correspondences between sub-bands and spatial information, and communicates the correspondences between sub-bands and spatial information with the base station of a cooperative cell ( 301 ); said base station implements coordinated scheduling with the base station of said cooperative cell according to the correspondences between sub-bands and spatial information ( 302 ). The present invention implements that less scheduling information is transmitted via an X2 interface, and thus promotes the application of the CBF solution in an actual system.

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Номер записи: 53

17-05-2012 дата публикации

Apparatus and method for allocating resources to nodes in a communication system using an update of iteration resource weights

Номер: US20120122505A1

Автор: Andreas Dotzler, Guido Dietl, Maximilian Riemensberger, Wolfgang Utschick

Принадлежит: NTT DOCOMO INC

An apparatus for allocating resources to nodes in a communication system comprises an iteration controller ( 10 ) for performing an iterative processing, the iteration controller being configured for using ( 11 ) iteration resource weights to obtain a resources allocation result for an iteration step, and for updating ( 12 ) the iteration resource weights to obtain updated iteration resource weights for a further iteration step using a weighted combination of the resources allocation results for the iteration step and for at least one earlier iteration step.

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Номер записи: 54

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.

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Номер записи: 55

24-05-2012 дата публикации

Radio base station apparatus, mobile terminal apparatus and transmission power control method

Номер: US20120127911A1

Автор: Daisuke Nishikawa, Yoshihisa Kishiyama

Принадлежит: NTT DOCOMO INC

To provide a radio base station apparatus, mobile terminal apparatus and transmission power control method for enabling conventional inter-cell interference reduction techniques and ULCoMP to be used together, a radio base station apparatus of the invention is characterized by having a ULCoMP processing section ( 2085 ) that applies ULCoMP to a mobile terminal ( 100 1 ) when a difference (PL 2 −PL 1 ) between a pass loss PL 1 between the mobile terminal ( 100 1 ) and a base station apparatus ( 200 1 ) connected to the mobile terminal ( 100 1 ) and a pass loss PL 2 between the mobile terminal ( 100 1 ) and a base station apparatus ( 200 2 ) with the lowest pass loss for the mobile terminal ( 100 1 ) is within a predetermined range, and a transmission power control section ( 2089 ) that performs transmission power control for application of ULCoMP when the ULCoMP is applied, while performing transmission power control for non-application of the ULCoMP when the ULCoMP is not applied.

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Номер записи: 56

24-05-2012 дата публикации

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

Номер: US20120127953A1

Автор: Nobuhiko Miki, Teruo Kawamura, Yoshihisa Kishiyama

Принадлежит: NTT DOCOMO INC

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

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Номер записи: 57

31-05-2012 дата публикации

Radio transmission control method, radio receiver apparatus, and radio transmitter apparatus

Номер: US20120134437A1

Автор: Akinori Taira, Kenji Suto, Tomoaki Otsuki, Yoshitaka Hara

Принадлежит: Mitsubishi Electric Corp

Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.

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Номер записи: 58

31-05-2012 дата публикации

Method and apparatus for detecting received signal in wireless communication system

Номер: US20120134438A1

Автор: Hwa-Sun You, Hyo-Yol Park

Принадлежит: SAMSUNG ELECTRONICS CO LTD

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

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Номер записи: 59

07-06-2012 дата публикации

Multiple-input multiple-output (mimo) antenna system

Номер: US20120139810A1

Автор: Antonio Faraone, Carlo Dinallo, Renato Cicchetti

Принадлежит: Motorola Inc

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

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Номер записи: 60

07-06-2012 дата публикации

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

Номер: US20120140683A1

Автор: Fabien Buda, Serdar SEZGINER, Weixiao Xu

Принадлежит: Sequans Communications SA

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

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Номер записи: 61

07-06-2012 дата публикации

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

Номер: US20120140834A1

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

Принадлежит: PURDUE RESEARCH FOUNDATION, SAMSUNG ELECTRONICS CO LTD

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

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Номер записи: 62

07-06-2012 дата публикации

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

Номер: US20120140842A1

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

Принадлежит: Qualcomm Inc

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

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Номер записи: 63

07-06-2012 дата публикации

Transmitting Terminal and Transmit Antenna Selecting Method Thereof

Номер: US20120140848A1

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

Принадлежит: Industrial Technology Research Institute ITRI

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

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Номер записи: 64

07-06-2012 дата публикации

Cooperative communication methods and a device for a target terminal and a cooperative terminal

Номер: US20120142345A1

Автор: Chang Bae Yoon, Dong Ho Cho, Dong Jo Park, Hyun Ho CHOI, Jung Min Moon, Sang Uk Park, Won Jae SHIN, Won Jong Noh

Принадлежит: Korea Advanced Institute of Science and Technology KAIST, SAMSUNG ELECTRONICS CO LTD

Provided is a cooperative communication technology of a target terminal and a cooperative terminal. In an environment in which interference exists between cells, cooperation between terminals may be performed in order to improve quality of signals that are received from a base station.

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Номер записи: 65

21-06-2012 дата публикации

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

Номер: US20120155336A1

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

Принадлежит: NEC Laboratories America Inc

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

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Номер записи: 66

21-06-2012 дата публикации

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

Номер: US20120155512A1

Автор: Georgios B. Giannakis, Xiaoli Ma

Принадлежит: University of Minnesota

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

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Номер записи: 67

21-06-2012 дата публикации

Apparatus for interference cancelling in wireless communication system and method using the same

Номер: US20120157084A1

Автор: Uk Jang

Принадлежит: Electronics and Telecommunications Research Institute ETRI

An interference cancellation method include detecting macro terminals which experience interference between a first signal output from a macro base-station and a second signal delivered from a femto terminal that is greater than a reference value; determining the number of channels of the femto base-station by subtracting the number of the detected macro terminals from the number of antennas of the femto base-station; generating a transmission beamforming weight vector using channel information of a signal interfered by the first signal and the second signal and channel information of the first signal; and providing a service, using the transmission beamforming weight vector, to as many femto terminals as the number obtained by subtracting the number of the detected macro terminals, which experience the interference greater than the reference value, from the number of the antennas of the femto base-station.

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Номер записи: 68

28-06-2012 дата публикации

Mu-mimo access point and user station including methods for multi-user group management

Номер: US20120163483A1

Автор: Robert J. Stacey, Xiaohong X. Gong

Принадлежит: Intel Corp

Embodiments of a MU-MIMO access point, user station and method for multi-user group management are generally described herein. In some embodiments, a MU-MIMO access point may assign a MU group identifier (GID) and a group member index (GMI) to each of a plurality of associated user stations. The MU-MIMO access point may transmit a MU-MIMO transmission that includes a plurality of spatial streams. The MU-MIMO transmission may be destined for the user stations of a single MU group indicated by a GID that is included within the MU-MIMO transmission. A subset of the spatial streams may be intended for each user station of the indicated MU group that is identified by the GID transmitted within the MU-MIMO transmission. A user station may use its assigned GMI along with an N sts field in the MU-MIMO transmission to determine which of the spatial streams to demodulate.

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Номер записи: 69

12-07-2012 дата публикации

Method and device for user cooperative communication

Номер: US20120176888A1

Автор: Gao Yang Dai, Wai Ho Mow

Принадлежит: Hui Long Fund LLC

A wireless network system and corresponding methodologies that operate in a user cooperative communication system are provided. In operation, the system either combines packets transmitted from a direct channel with packets transmitted from and a relay channel, or uses erroneously relayed packets to assist decoding a direct packet.

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Номер записи: 70

12-07-2012 дата публикации

Method and apparatus for supporting high-speed mobile terminals in a distributed antenna system

Номер: US20120178468A1

Автор: Su-Ryong Jeong, Tae-Young Kim

Принадлежит: SAMSUNG ELECTRONICS CO LTD

A method and apparatus for supporting a high-speed mobile terminal in a distributed antenna system. The method includes acquiring information on a position and a speed of each terminal of a plurality of terminals, mapping the plurality of terminals to at least one or more terminal groups based on at least one or more of the position or the speed of the terminal, determining a service end time point at a serving antenna node and a service start time point at a target antenna node, using position and speed information associated with the terminal group, and switching an antenna node for the terminal group, according to the service end time point at the serving antenna node and the service start time point at the target antenna node.

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Номер записи: 71

12-07-2012 дата публикации

Control station and wireless system

Номер: US20120178495A1

Автор: Tsuguhide Aoki, Yuji Tohzaka

Принадлежит: Toshiba Corp

A first extended base station that forms a first cell and a second extended base station that forms a second cell operate for a cooperative communication of transmitting same data to a user terminal located in the first cell. A second signal processor that corresponds to the second extended base station generates a training signal specific to the first extended base station and the first extended base station and the second extended base station transmit same data and same training signals. Thus, a cooperative communication can be realized in a system that uses a training signal specific to a base station.

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Номер записи: 72

19-07-2012 дата публикации

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

Номер: US20120182985A1

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

Принадлежит: Panasonic Corp

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

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Номер записи: 73

19-07-2012 дата публикации

Reduced Bandwidth Backhaul for Coordinated Multi-Point Reception

Номер: US20120184218A1

Автор: Adrien Joseph Comeau, Gary David Boudreau

Принадлежит: Telefonaktiebolaget LM Ericsson AB

Embodiments herein provide reduced backhaul bandwidth requirements for Coordinated Multi-Point reception of an uplink signal. A cooperating base station receive and demodulates the uplink signal to produce soft output values that each indicate the value of a corresponding information symbol in the uplink signal and the level of certainty in that symbol value. The cooperating base station then selectively sends particular ones of the soft output values to a serving base station over a backhaul communication link based on whether or not the level of certainty indicated by each soft output value exceeds a certainty threshold. The serving base station likewise receives and demodulates the uplink signal to produce its own soft output values. The serving base station then combines respective ones of the soft output values it received from the cooperating base station and the soft output values it produced itself that are associated with the same information symbol.

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Номер записи: 74

19-07-2012 дата публикации

Base station device

Номер: US20120184312A1

Автор: Kenichi Murakami, Takashi Yamamoto, Yoshiyuki Shimada

Принадлежит: Sumitomo Electric Industries Ltd

A base station device includes: a downlink signal reception unit 12 that receives a transmission signal from another base station device; a synchronization processing unit 5 b that obtains the transmission signal received by the downlink signal reception unit 12 , and performs a synchronization process by using the transmission signal; and a terminal detection unit 5 e that detects the state of communication with terminal devices connected to the base station device and/or the another base station device. The synchronization processing unit 5 b adjusts the timing to obtain the transmission signal, based on a detection result of the terminal detection unit 5 e.

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Номер записи: 75

26-07-2012 дата публикации

Efficient uplink transmission of channel state information

Номер: US20120188972A1

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

Принадлежит: Individual

A UE in a wireless communication network transmits succinct, direct channel state information to the network, enabling coordinated multipoint calculations such as joint processing, without substantially increasing uplink overhead. The UE receives and processes reference symbols over a set of non-uniformly spaced sub-carriers, selected according to a scheme synchronized to the network. The frequency response for each selected sub-carrier is estimated conventionally, and the results quantized and transmitted to the network on an uplink control channel. The non-uniform sub-carrier selection may be synchronized to the network in a variety of ways.

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Номер записи: 76

26-07-2012 дата публикации

Method and apparatus for obtaining precoding matrix indicator

Номер: US20120189075A1

Автор: Jianguo Wang, Yongxing Zhou

Принадлежит: Huawei Technologies Co Ltd

The present disclosure discloses a method and an apparatus for obtaining a precoding matrix indicator, and relates to the field of communication technologies. The method includes: obtaining a first rotation matrix according to first channel information; obtaining a first differential matrix according to the first rotation matrix and a currently-obtained instantaneous beam forming matrix/precoding matrix; and quantizing, according to a first differential codebook, a pre-acquired first rank indicator, and preset quantization criteria, the first differential matrix to obtain a differential precoding matrix indicator. The apparatus includes: a first rotation matrix obtaining module, a first differential matrix obtaining module, and a differential precoding matrix indicator obtaining module. In the present disclosure, the differential PMI is obtained according to the channel information, and the differential PMI is used for feedback, which not only reduces an overhead, but also improves feedback accuracy.

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Номер записи: 77

02-08-2012 дата публикации

Method and apparatus for timing and/or frequency offset monitoring and handling

Номер: US20120195256A1

Автор: Peter George Khoury

Принадлежит: Spidercloud Wireless Inc

Methods and apparatuses are provided for obtaining downlink or uplink signal characteristics of at least one access point in a network. The signal characteristics may be obtained through user equipment receiving the signal characteristics, through the at least one access point, or through another access point. Frequency or timing offset between two or more access points may be determined based on the obtained signal characteristics, where the frequency or timing offset may be handled through post processing. For example, a clock servo may be controlled or adjusted in response to the determined offset, the absolute frequency of a master network oscillator may be calibrated, traffic anomalies within the network may be detected and corrected, and/or respective clocks of the two or more access points may be synchronized.

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Номер записи: 78

02-08-2012 дата публикации

Joint uplink data processing by plural base stations

Номер: US20120195284A1

Автор: Donald Brinkhurst, Jianguo Long, Karl D. Mann, Ping Yu, Roger Mah

Принадлежит: Nortel Networks Ltd

Joint uplink processing by plural base stations includes sending, by a serving base station, a request for uplink resources of a second base station for receiving uplink data of a mobile station. The serving base station receives first uplink data from the mobile station, and the serving base station further receives (from the second base station) second uplink data of the mobile station received by the second base station using the uplink resources specified by the request.

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Номер записи: 79

09-08-2012 дата публикации

Transmit methods with delay diversity and space-frequency diversity

Номер: US20120201329A1

Автор: Cornelius van Rensburg, Farooo Khan, Jianzhong Zhang, Yinong Ding

Принадлежит: Individual

In this invention, several open-loop solutions that encompass the small delay CDD codeword cycling, codeword cycling between different re-transmissions of both small and large delay CDD are proposed. In addition, an open-loop codeword cycling method for SFBC+FSTD scheme, as well as its extension to SFBC+FSTD based HARQ, are proposed. In one method, a plurality of information bits are encoded, scrambled and modulated to generate a plurality of modulation symbols. The plurality of modulation symbols are mapped onto the subcarriers in at least one transmission layer of a transmission resource. The modulation symbols are then precoded by using a matrix for cyclic delay diversity and a set of codewords from a certain codebook to generate a plurality of precoded symbols. The codewords are cycled for every a certain number of subcarriers. Finally, the precoded symbols are transmitted via a plurality of transmission antennas.

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Номер записи: 80

09-08-2012 дата публикации

System and Method for Transparent Coordinated Beam-Forming

Номер: US20120202431A1

Автор: Jianglei Ma, Mark Andrew Hawryluck, Ming Jia

Принадлежит: FutureWei Technologies Inc

A method for reducing interference at a first user equipment (UE) includes receiving, by a second communications controller, a request to reduce interference at the first UE, the first UE being served by a first communications controller. The method also includes determining, by the second communications controller, a beam adjustment in accordance with uplink transmission measurements of the first UE and a second UE, the beam adjustment to aim a transmission to the second UE away from the second UE and towards an angle orthogonal to a first direction of the first UE relative to the second communications controller, the second UE being served by the second communications controller. The method further includes pre-adjusting, by the second communications controller, the transmission with the beam adjustment, and transmitting, by the second communications controller, the pre-adjusted transmission to the second UE.

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Номер записи: 81

16-08-2012 дата публикации

Method for transmitting data in multi-user wireless communication system

Номер: US20120207097A1

Автор: Jong-Ee Oh, Sok-Kyu Lee, Yu-Ro Lee

Принадлежит: Electronics and Telecommunications Research Institute ETRI

The present invention particularly relates to a method and an apparatus for improving the efficiency of data transmission in a multi-user wireless transmission system. According to one embodiment of the present invention, the method, which is a transmission method of data in a multi-user wireless communication system, comprises the steps of: estimating channel states of each terminal through sounding or feedback information received from the terminals, and selecting terminals to which individual data are to be transmitted at the same time; determining a signal to noise ratio of the selected terminals, and calculating a precoding matrix; calculating a modulation and coding scheme (MCS) of each terminal and the number of symbols of data fields in accordance with the MCS of each terminal; dividing an area according to the number of terminals to which the data fields are to be simultaneously transmitted, if there are two or more selected terminals; and recalculating a reception signal to interference and noise ratio (SINR) for each area of each terminal, configuring a packet by resetting the MCS according to the recalculated SINR, and transmitting the configured packet.

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Номер записи: 82

16-08-2012 дата публикации

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

Номер: US20120207145A1

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

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

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

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Номер записи: 83

16-08-2012 дата публикации

Mobility procedures in wireless networks with distributed remote radio heads

Номер: US20120208541A1

Автор: Hao Xu, Juan Montojo, Peter Gaal, Tingfang JI, Wanshi Chen, Xiliang Luo

Принадлежит: Qualcomm Inc

Wireless networks may include remote radio heads (RRHs) for extending the coverage of a macro cell. The macro cell may be connected to the RRHs, for example, by optical fiber, and there may be negligible latency between the macro cell and the RRHs. As a user equipment (UE) moves within the macro cell, or between other macro cells, mobility procedures followed by the UE may vary based on the release of the UE (e.g., Rel-8/9, Rel-10, or Rel-11 and beyond). The macro cell may handle all the scheduling within the cell, for itself and the RRHs.

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Номер записи: 84

16-08-2012 дата публикации

Communication system, radio base station, and communication control method

Номер: US20120208546A1

Автор: Taku Nakayama

Принадлежит: Kyocera Corp

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

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Номер записи: 85

16-08-2012 дата публикации

Method, apparatus and system for estimating channels

Номер: US20120208577A1

Автор: Lei Wan, Mingyu Zhou, Xingqing Cheng, Yajun Zhao

Принадлежит: Huawei Technologies Co Ltd

A method, an apparatus and a system for estimating channels are disclosed. A method for estimating channels includes: receiving, by a User Equipment (UE), downlink signals sent by two or more Access Points (APs), wherein no common reference signal is comprised in any data channel symbol domain except a preset symbol domain in the downlink signals; and performing, by the UE, channel estimation according to the downlink signals. The technical solution disclosed herein eliminates the interference between the reference signal and the data signal, enables the UE to estimate the channel value between the UE and the cooperative APs accurately, and improves the UE performance.

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Номер записи: 86

23-08-2012 дата публикации

Radio resource monitoring (rrm) and radio link monitoring (rlm) procedures for remote radio head (rrh) deployments

Номер: US20120213108A1

Автор: Hao Xu, Osok Song, Peter Gaal, Tingfang JI

Принадлежит: Qualcomm Inc

Wireless networks may include remote radio heads (RRHs) for extending the coverage of a macro cell. The macro cell may be connected to the RRHs, for example, by optical fiber, and there may be negligible latency between the macro cell and the RRHs. RRH deployment with different cell specific RS transmissions may create many cell edges, which may present challenges in idle state mobility. Certain aspects of the present disclosure may utilize coordinated multipoint (CoMP) transmissions for idle user equipment (UE) support and, in some aspects, may introduce new radio link monitoring (RLM) techniques. As a result, the techniques presented herein may help achieve better idle mode performance and/or better RLM performance.

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Номер записи: 87

30-08-2012 дата публикации

Downlink 8 Tx Codebook Sub-Sampling for CSI Feedback

Номер: US20120218948A1

Автор: Eko N. Onggosanusi, Runhua Chen

Принадлежит: Texas Instruments Inc

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

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Номер записи: 88

30-08-2012 дата публикации

Method for transmitting channel quality information, and apparatus for same

Номер: US20120218968A1

Автор: Eun Sun Kim, Hak Seong Kim, Han Byul SEO, Ki Jun Kim

Принадлежит: LG ELECTRONICS INC

The present invention relates to a wireless communication system. In particular, the present invention relates to a method and apparatus for transmitting channel quality information using a terminal, wherein the method comprises the steps of: receiving CoMP configuration information from a serving transmission point; receiving a downlink signal from a plurality of transmission points; and transmitting channel quality information on one or more downlink sub-bands for each transmission point to the serving transmission point, wherein the plurality of transmission points select the same one or more downlink sub-bands in consideration of the CoMP configuration information.

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Номер записи: 89

06-09-2012 дата публикации

Method And Apparatus Supporting Improved Wide Bandwidth Transmissions

Номер: US20120224612A1

Автор: Ning Zhang, Youhan Kim

Принадлежит: Qualcomm Atheros Inc

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

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Номер записи: 90

06-09-2012 дата публикации

Method and Terminal for Channel State Information Feedback

Номер: US20120224652A1

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

Принадлежит: ZTE Corp

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

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Номер записи: 91

13-09-2012 дата публикации

Mobile communication system, relay station, and base station

Номер: US20120230224A1

Автор: Boonsarn Pitakdumrongkija, Hiroaki Aminaka, Yoshikazu Kakura

Принадлежит: NEC Corp

A mobile communication system includes a base station and a relay station. The base station transmits carrier information to the relay station during connection of a first radio link using a first carrier. The carrier information indicates at least one candidate carrier available for performing multi-carrier communication on the first radio link. The relay station transmits, to the base station, request information about a configuration of the first radio link for the at least one candidate carrier indicated by the carrier information. The base station further determines, in response to receiving the request information from the relay station, a second carrier used with the first carrier for the multi-carrier communication.

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Номер записи: 92

27-09-2012 дата публикации

Carrier-phase difference detection and tracking in multipoint broadcast channels

Номер: US20120243424A1

Автор: Xiao-an Wang

Принадлежит: Individual

Methods and apparatus are described that provide carrier-phase difference (CPD) acquisition via signaling protocols between communicating devices. The random CPD between two disjoint devices can be measured by the signaling protocols described herein. With the availability of the CPD, a device is also able to acquire its outgoing channel (transmit channel) information, thus avoiding the channel information feedback that is being considered and/or practiced in some wireless communications systems. Also described are methods and apparatus that use the CPD to synchronize the clocks of two or more devices and that track the time-variations of the CPD for reliable CPD measurement and tracking loop operations. Applications of the described methods and apparatus include wireless multipoint broadcast systems, also known as coordinated multipoint transmission, or CoMP, in LTE (long-term evolution)-advanced systems, point-to-point wireless MIMO systems, and general wireless device networks.

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Номер записи: 93

04-10-2012 дата публикации

Device, system and method of wireless communication

Номер: US20120250645A1

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

Принадлежит: Intel Corp

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

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Номер записи: 94

04-10-2012 дата публикации

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

Номер: US20120250780A1

Автор: BIN Li, Hui Shen, YI LUO

Принадлежит: Huawei Technologies Co Ltd

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

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Номер записи: 95

04-10-2012 дата публикации

Spatial spreading in a multi-antenna communication system

Номер: US20120250788A1

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

Принадлежит: Qualcomm Inc

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

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Номер записи: 96

04-10-2012 дата публикации

Transmitter for communications system

Номер: US20120252381A1

Автор: Kimihiko Imamura, Ryota Yamada, Toshizo Nogami

Принадлежит: Kimihiko Imamura, Ryota Yamada, Toshizo Nogami

An rf signal transmitter for transmitting rf signals through a plurality of antennas is described, which comprises: a transmit section adapted to selectively set, with respect to an input signal, the initial phase of an output to at least one of said antennas depending on a time or frequency region used for communication and to provide delay to the output on an antenna-by-antenna basis and on the basis of a transmission timing or a transmission frequency; and a quality information receive section for receiving quality information from destination station, i.e., a wireless terminal unit, said quality information concerning the rf signal transmitted from said transmit section and received at said destination station.

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Номер записи: 97

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.

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Номер записи: 98

11-10-2012 дата публикации

Method and apparatus of system scheduler

Номер: US20120257596A1

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

Принадлежит: Intel Corp

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

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Номер записи: 99

11-10-2012 дата публикации

Network Coding Method and Device in Cooperative Communication

Номер: US20120257695A1

Автор: BIN Li, Feng Liu, Hui Shen, XiangGen XIA, YI LUO

Принадлежит: Huawei Technologies Co Ltd

Embodiments of the present invention provide a network coding method and device in cooperative communication. The method, application and device relate to the field of wireless network communications. The method includes: receiving a signal sent from a first source node by using an OFDM symbol, and receiving a signal sent from a second source node by using an OFDM symbol; and performing a time reversal on one part of received mixed signals, and performing a reversal of a complex conjugate operation on the other part of the received mixed signals. The method, application and device have the advantage of obtaining a full diversity gain.

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Номер записи: 100