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    Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system
    92.
    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.

    93.
    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.

    MIMO system with multiple spatial multiplexing modes
    95.
    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.

    SINGLE-BURST ACQUISITION FOR WIRELESS COMMUNICATION SYSTEM
    100.
    发明专利
    SINGLE-BURST ACQUISITION FOR WIRELESS COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2777497A1

    公开(公告)日：2007-11-29

    申请号：CA2777497

    申请日：2007-05-22

    Applicant: QUALCOMM INC

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

    IPC: H04L7/02 ,  H04W56/00 ,  H04W80/02

    Abstract: Techniques for performing acquisition of packets are described. First detection values may be determined based on a first plurality of samples, e.g., by performing delay-multiply-integrate on the samples. Power values may be determined based on the first plurality of samples, e.g., by performing multiply-integrate on the samples. The first detection values may be averaged to obtain average detection values. The power values may also be averaged to obtain average power values. Whether a packet is presence may be determined based on the average detection values and the average power values. Second detection values may be determined based on a second plurality of samples. The start of the packet may be determined based on the first and second detection values. A third detection value may be determined based on a third plurality of samples. Frequency error of the packet may be estimated based on the first and third detection values.

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