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    SPATIAL SPREADING IN A MULTI-ANTENNA COMMUNICATION SYSTEM
    1.
    发明授权
    SPATIAL SPREADING IN A MULTI-ANTENNA COMMUNICATION SYSTEM 有权
    空间扩展在多天线通信系统

    公开(公告)号：EP1695477B1

    公开(公告)日：2011-10-26

    申请号：EP04814424.0

    申请日：2004-12-15

    申请人： Qualcomm, Incorporated

    发明人： WALTON, Jay Rodney ,  ZHENG, Lizhong ,  KETCHUM, John W. ,  WALLACE, Mark S. ,  HOWARD, Steven J.

    IPC分类号： H04L1/06

    CPC分类号： H04B7/0417 ,  H04B7/0456 ,  H04B7/0669 ,  H04B17/336 ,  H04L1/06

    摘要： 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 ND data symbol blocks to be transmitted in NM transmission spans, where ND≧1 and NM>1. The ND blocks are partitioned into NM 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 NT transmit antennas in one transmission span. The ND data symbol blocks are thus spatially processed with NM steering matrices and observe an ensemble of channels.

    SYSTEMS AND METHODS FOR ENHANCED CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEMS
    2.
    发明公开
    SYSTEMS AND METHODS FOR ENHANCED CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEMS 审中-公开
    系统和无线通信系统中增强的信道估计方法

    公开(公告)号：EP2122950A2

    公开(公告)日：2009-11-25

    申请号：EP08727343.9

    申请日：2008-01-02

    申请人： QUALCOMM Incorporated

    发明人： BJERKE, Bjorn ,  HOWARD, Steven J.

    IPC分类号： H04L25/02

    CPC分类号： H04L25/0212 ,  H04L27/2647

    摘要： Disclosed herein are methods and apparatus for enhancing the estimation of channel response in a wireless communication system. An apparatus (and associated method) for optimizing channel estimation in a communication system includes a receiving antenna; a receiver adapted to receive a signal from the receiving antenna; an initial channel estimator module adapted to select a selected channel from among one or more channels in the communication system and to determine, for the selected channel, an initial channel estimate based upon the received signal; a transformation module adapted to transform the initial channel estimate into an initial impulse response estimate comprising a sequence of samples; a filtering module adapted to select a sub-sequence of samples from the sequence of samples and generate a truncated initial impulse response estimate by setting to zero the samples in the initial impulse response estimate that are not in the selected sub-sequence of samples; and a maximum likelihood channel estimating module adapted to compute a time domain weighted impulse response estimate using the truncated time domain impulse response estimate for the selected channel and to compute a maximum likelihood channel estimate for the selected channel by transforming the time domain weighted impulse response estimate into the frequency domain.

    METHOD AND APPARATUS FOR CONTINUOUS BEAMFORMING FOR A MIMO-OFDM SYSTEM
    3.
    发明授权
    METHOD AND APPARATUS FOR CONTINUOUS BEAMFORMING FOR A MIMO-OFDM SYSTEM 有权

    公开(公告)号：EP3110096B1

    公开(公告)日：2018-09-12

    申请号：EP16173852.1

    申请日：2005-04-29

    申请人： QUALCOMM Incorporated

    发明人： HOWARD, Steven J. ,  WALTON, Jay Rodney ,  WALLACE, Mark S.

    IPC分类号： H04L27/26 ,  H04B7/06

    CPC分类号： H04B7/0617 ,  H04B7/0408 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0671

    摘要： A transmitting entity performs spatial processing on data symbols for each subband with an eigenmode matrix, a steering matrix, or an identity matrix to obtain spatially processed symbols for the subband. The data symbols may be sent on orthogonal spatial channels with the eigenmode matrix, on different spatial channels with the steering matrix, or from different transmit antennas with the identity matrix. The transmitting entity further performs beamforming on the spatially processed symbols, in the frequency domain or time domain, prior to transmission from the multiple transmit antennas. A receiving entity performs the complementary processing to recover the data symbols sent by the transmitting entity. The receiving entity may derive a spatial filter matrix for each subband based on a MIMO channel response matrix for that subband and perform receiver spatial processing for the subband with the spatial filter matrix.

    STEERING DIVERSITY FOR AN OFDM-BASED MULTI-ANTENNA COMMUNICATION SYSTEM
    7.
    发明公开
    STEERING DIVERSITY FOR AN OFDM-BASED MULTI-ANTENNA COMMUNICATION SYSTEM 有权
    林肯多元FÜREIN AUF OFDM基础MEHRANTENNEN-KOMMUNIKATIONSSYSTEM

    公开(公告)号：EP1747652A1

    公开(公告)日：2007-01-31

    申请号：EP05744011.7

    申请日：2005-04-29

    申请人： Qualcomm, Incorporated

    发明人： LUNDBY, Stein A. ,  HOWARD, Steven J. ,  WALTON, Jay Rodney

    IPC分类号： H04L27/26 ,  H04B7/06

    CPC分类号： H04L27/2602

    摘要： A transmitting entity uses different steering vectors for different subbands to achieve steering diversity. Each steering vector defines or forms a beam for an associated subband. Any steering vector may be used for steering diversity. The steering vectors may be defined such that the beams vary in a continuous instead of abrupt manner across the subbands. This may be achieved by applying continuously changing phase shifts across the subbands for each transmit antenna. As an example, the phase shifts may change in a linear manner across the subbands for each transmit antenna, and each antenna may be associated with a different phase slope. The application of linearly changing phase shifts to modulation symbols in the frequency domain may be achieved by either delaying or circularly shifting the corresponding time-domain samples.

    摘要翻译： 发射实体为不同的子带使用不同的导向矢量来实现转向分集。 每个导向矢量定义或形成相关子带的波束。 任何导向矢量都可用于转向分集。 导向矢量可以被定义为使得光束在连续而不是突变的方式跨越子带而变化。 这可以通过在每个发射天线的子带上应用连续变化的相移来实现。 作为示例，相移可以在每个发射天线的子带上以线性方式改变，并且每个天线可以与不同的相位斜率相关联。 线性变化相移到频域中的调制符号的应用可以通过延迟或循环移位对应的时域采样来实现。

    METHODS AND APPARATUSES FOR PROVIDING FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS
    9.
    发明授权
    METHODS AND APPARATUSES FOR PROVIDING FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS 有权

    公开(公告)号：EP2025101B1

    公开(公告)日：2018-08-15

    申请号：EP07784219.3

    申请日：2007-05-30

    申请人： Qualcomm Incorporated

    发明人： SURINENI, Shravan K. ,  WALTON, J. Rodney ,  WALLACE, Mark ,  HOWARD, Steven J.

    IPC分类号： H04B7/0417 ,  H04B7/06 ,  H04L1/16

    CPC分类号： H04B7/0636 ,  H04B7/0417 ,  H04B7/0634 ,  H04L1/1671

    摘要： Techniques for quickly sending feedback information for beamforming are described. A transmitter/initiator sends a first frame comprising training symbols. A receiver/responder receives the first frame, determines the amount of time to generate feedback information, and determines the amount of time to send the feedback information. The receiver then determines the length of a second frame carrying the feedback information based on the amounts of time to generate and send the feedback information. The receiver sends the second frame after waiting a short interframe space (SIFS) period from the end of the first frame, without performing channel access. The receiver generates the feedback information based on the training symbols and sends the information in the second frame when ready. The transmitter receives the second frame, derives at least one steering matrix based on the feedback information, and sends a third frame with the at least one steering matrix.