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    EFFICIENT COMPUTATION OF SPATIAL FILTER MATRICES FOR STEERING TRANSMIT DIVERSITY IN A MIMO COMMUNICATION SYSTEM
    71.
    发明专利
    EFFICIENT COMPUTATION OF SPATIAL FILTER MATRICES FOR STEERING TRANSMIT DIVERSITY IN A MIMO COMMUNICATION SYSTEM 未知

    公开(公告)号：MY139975A

    公开(公告)日：2009-11-30

    申请号：MYPI20052973

    申请日：2005-06-29

    Applicant: QUALCOMM INC

    Inventor： WALLACE MARK S ,  RODNEY WALTON JAY ,  HOWARD STEVEN J

    IPC: H04J99/00 ,  H04B7/08

    Abstract: TECHNIQUES FOR EFFICIENTLY COMPUTING SPATIAL FILTER MATRICES ARE DESCRIBED. THE CHANNEL RESPONSE MATRICES FOR A MIMO CHANNEL MAY BE HIGHLY CORRELATED IF THE CHANNEL IS RELATIVELY STATIC OVER A RANGE OF TRANSMISSION SPANS. IN THIS CASE, AN INITIAL SPATIAL FILTER MATRIX MAY BE DERIVED BASED ON ONE CHANNEL RESPONSE MATRIX, AND A SPATIAL FILTER MATRIX FOR EACH TRANSMISSION SPAN MAY BE COMPUTED BASED ON THE INITIAL SPATIAL FILTER MATRIX AND A STEERING MATRIX USED FOR THAT TRANSMISSION SPAN. THE CHANNEL RESPONSE MATRICES MAY BE PARTIALLY CORRELATED IF THE MIMO CHANNEL IS NOT STATIC BUT DOES NOT CHANGE ABRUPTLY. IN THIS CASE, A SPATIAL FILTER MATRIX MAY BE DERIVED FOR ONE TRANSMISSION SPAN £ AND USED TO DERIVE AN INITIAL SPATIAL FILTER MATRIX FOR ANOTHER TRANSMISSION SPAN M. A SPATIAL FILTER MATRIX FOR TRANSMISSION SPAN M MAY BE COMPUTED BASED ON THE INITIAL SPATIAL FILTER MATRIX, E.G., USING AN ITERATIVE PROCEDURE.

    Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system
    73.
    发明专利
    Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system 未知

    公开(公告)号：AU2005260035C1

    公开(公告)日：2009-09-17

    申请号：AU2005260035

    申请日：2005-06-27

    Applicant: QUALCOMM INC

    Inventor： WALTON JAY RODNEY ,  HOWARD STEVEN J ,  WALLACE MARK S

    IPC: H04J99/00 ,  H04B7/08

    Abstract: Techniques for efficiently computing spatial filter matrices are described. The channel response matrices for a MIMO channel may be highly correlated if the channel is relatively static over a range of transmission spans. In this case, an initial spatial filter matrix may be derived based on one channel response matrix, and a spatial filter matrix for each transmission span may be computed based on the initial spatial filter matrix and a steering matrix used for that transmission span. The channel response matrices may be partially correlated if the MIMO channel is not static but does not change abruptly. In this case, a spatial filter matrix may be derived for one transmission span l and used to derive an initial spatial filter matrix for another transmission span m. A spatial filter matrix for transmission span m may be computed based on the initial spatial filter matrix, e.g., using an iterative procedure.

    75.
    发明专利
    未知

    公开(公告)号：DE602004013462T2

    公开(公告)日：2009-07-16

    申请号：DE602004013462

    申请日：2004-12-13

    Applicant: QUALCOMM INC

    Inventor： WALTON JAY RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK S ,  HOWARD STEVEN J

    IPC: H04J99/00 ,  H04L25/03 ,  H04B7/005 ,  H04B7/02 ,  H04B7/04 ,  H04B7/06 ,  H04B7/12 ,  H04L1/02

    Abstract: An access point in a multi-antenna system broadcasts data using spatial spreading to randomize an 'effective' channel observed by each user terminal for each block of data symbols broadcast by the access point. At the access point, data is coded, interleaved, and modulated to obtain N D data symbol blocks to be broadcast in N M transmission spans, where N D ‰¥1 and N M >1. The N D data symbol 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) 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 broadcast via N T transmit antennas and in one transmission span to user terminals within a broadcast coverage area.

    MULTI-ANTENNA TRANSMISSION FOR SPATIAL DIVISION MULTIPLE ACCESS
    76.
    发明专利
    MULTI-ANTENNA TRANSMISSION FOR SPATIAL DIVISION MULTIPLE ACCESS 未知

    公开(公告)号：SG150535A1

    公开(公告)日：2009-03-30

    申请号：SG2009012105

    申请日：2004-11-12

    Applicant: QUALCOMM INC

    Inventor： WALTON J RODNEY ,  KETCHUM JOHN W ,  SMEE JOHN EDWARD ,  WALLACE MARK S ,  HOWARD STEVEN J

    IPC: H04B7/06 ,  H04J11/00 ,  H04J99/00 ,  H04L5/02 ,  H04Q7/36

    Abstract: MULTI-ANTENNA TRANSMISSION FOR SPATIAL DIVISION MULTIPLE ACCESS An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An 'effective' uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.

    MIMO system with multiple spatial multiplexing modes
    77.
    发明专利
    MIMO system with multiple spatial multiplexing modes 未知

    公开(公告)号：AU2003287296B2

    公开(公告)日：2009-02-19

    申请号：AU2003287296

    申请日：2003-10-24

    Applicant: QUALCOMM INC

    Inventor： KETCHUM JOHN W ,  HOWARD STEVEN J ,  WALTON JAY RODNEY ,  WALLACE MARK

    IPC: H04J99/00 ,  H04L1/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

    Abstract: A MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility. These modes may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a single-user non-steered mode that transmits multiple data streams from multiple antennas to a single receiver without spatial processing at a transmitter, (3) a multi-user steered mode that transmits multiple data streams simultaneously to multiple receivers with spatial processing at a transmitter, and (4) a multi-user non-steered mode that transmits multiple data streams from multiple antennas (co-located or non co-located) without spatial processing at the transmitter(s) to receiver(s) having multiple antennas.; For each set of user terminal(s) selected for data transmission on the downlink and/or uplink, a spatial multiplexing mode is selected for the user terminal set from among the multiple spatial multiplexing modes supported by the system.

    SYSTEMS AND METHODS FOR ENHANCED CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEMS
    80.
    发明专利
    SYSTEMS AND METHODS FOR ENHANCED CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEMS 未知

    公开(公告)号：CA2671681A1

    公开(公告)日：2008-07-10

    申请号：CA2671681

    申请日：2008-01-02

    Applicant: QUALCOMM INC

    Inventor： HOWARD STEVEN J ,  BJERKE BJORN

    IPC: H04L25/02 ,  H04L69/14

    Abstract: Disclosed herein are methods and apparatus for enhancing the estimation o f channel response in a wireless communication system. An apparatus (and ass ociated method) for optimizing channel estimation in a communication system includes a receiving antenna; a receiver adapted to receive a signal from th e receiving antenna; an initial channel estimator module adapted to select a selected channel from among one or more channels in the communication syste m and to determine, for the selected channel, an initial channel estimate ba sed upon the received signal; a transformation module adapted to transform t he initial channel estimate into an initial impulse response estimate compri sing a sequence of samples; a filtering module adapted to select a sub-seque nce of samples from the sequence of samples and generate a truncated initial impulse response estimate by setting to zero the samples in the initial imp ulse response estimate that are not in the selected sub-sequence of samples; and a maximum likelihood channel estimating module adapted to compute a tim e 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 tim e domain weighted impulse response estimate into the frequency domain.

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