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    DERIVATION AND FEEDBACK OF A TRANSMIT STEERING MATRIX
    13.
    发明公开
    DERIVATION AND FEEDBACK OF A TRANSMIT STEERING MATRIX 有权
    铅和传输引导矩阵反馈

    公开(公告)号：EP2020112A2

    公开(公告)日：2009-02-04

    申请号：EP07797662.9

    申请日：2007-05-22

    申请人： Qualcomm Incorporated

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

    IPC分类号： H04L1/06

    CPC分类号： H01Q21/00 ,  H04B7/0404 ,  H04B7/0417 ,  H04B7/0634 ,  H04B7/066 ,  H04L1/0675

    摘要： Techniques for efficiently deriving a transmit steering matrix and sending feedback for this matrix are described. A receiver determines a set of parameters defining a transmit steering matrix to be used for transmission from a transmitter to the receiver. The receiver may derive the transmit steering matrix based on a set of transformation matrices, which may be used for multiple iterations of Jacobi rotation to zero out off-diagonal elements of a channel matrix. The receiver may then determine the set of parameters based on the transformation matrices. The set of parameters may comprise at least one angle, at least one value, at least one index, etc., for each transformation matrix. The receiver sends the set of parameters defining the transmit steering matrix (instead of elements of the transmit steering matrix) to the transmitter for use by the transmitter to derive the transmit steering matrix.

    REALLOCATION OF EXCESS POWER FOR FULL CHANNEL-STATE INFORMATION (CSI) MULTIPLE-INPUT, MULTIPLE-OUTPUT (MIMO) SYSTEMS
    18.
    发明公开
    REALLOCATION OF EXCESS POWER FOR FULL CHANNEL-STATE INFORMATION (CSI) MULTIPLE-INPUT, MULTIPLE-OUTPUT (MIMO) SYSTEMS 有权
    生产能力过剩FOR多个输入 - 输出多个系统（MIMO）系统，具有全信道状态信息REMAP（CSI）

    公开(公告)号：EP1468505A1

    公开(公告)日：2004-10-20

    申请号：EP03707488.7

    申请日：2003-01-22

    申请人： QUALCOMM Incorporated

    发明人： MEDVEDEV, Irina ,  WALTON, Jay, Rod ,  KETCHUM, John, W.

    IPC分类号： H04B7/005

    CPC分类号： H04W52/346 ,  H04B7/0443 ,  H04W24/00 ,  H04W52/241 ,  H04W52/267 ,  H04W52/50 ,  H04W72/00

    摘要： Techniques to allocate the total transmit power to the transmission channels in a multi-channel communication system such that higher overall system spectral efficiency and/or other benefits may be achieved. The total transmit power may be initially allocated to the transmission channels based on a particular power allocation scheme (e.g., the water-filling scheme). The initial allocation may result in more power being allocated to some transmission channels than needed to achieve the required SNR (e.g., the SNR needed to achieve the maximum allowed data rate), which would then result in these transmission channels being operated in the saturation region. In such situations, the techniques reallocate the excess transmit power of transmission channels operated in the saturation region to other transmission channels operated below the saturation region. In this way, higher data rate may be achieved for the 'poorer' transmission channels without sacrificing the performance of the 'better' transmission channels.

    TIME-DOMAIN TRANSMIT AND RECEIVE PROCESSING USING SINGULAR VALUE DECOMPOSITION FOR MIMO SYSTEMS
    19.
    发明公开
    TIME-DOMAIN TRANSMIT AND RECEIVE PROCESSING USING SINGULAR VALUE DECOMPOSITION FOR MIMO SYSTEMS 有权
    SENDE- UND EMPFANGSVERARBEITUNG MITSINGULÄRWERT-ZERLEGUNGFÜRMIMO-SYSTEME

    公开(公告)号：EP1451964A2

    公开(公告)日：2004-09-01

    申请号：EP02792324.2

    申请日：2002-12-03

    申请人： Qualcomm Incorporated

    发明人： KETCHUM, John, W. ,  WALLACE, Mark ,  HOWARD, Steven, J. ,  WALTON, Jay, R.

    IPC分类号： H04L1/00 ,  H04L25/03

    CPC分类号： H04B7/0417 ,  H04B7/0443 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0029 ,  H04L25/03343 ,  H04L25/03834 ,  H04L27/2601 ,  H04L27/2647 ,  H04L2025/0349 ,  H04L2025/03605

    摘要： Techniques for processing a data transmission at the transmitter and receiver. In an aspect, a time-domain implementation is provided which uses frequency-domain singular value decomposition and "water-pouring" results to derive time-domain pulse-shaping and beam-steering solutions at the transmitter and receiver. The singular value decomposition is performed at the transmitter to determine eigen-modes (i.e., spatial subchannels) of the MIMO channel and to derive a first set of steering vectors used to "precondition" modulation symbols. The singular value decomposition is also performed at the receiver to derive a second set of steering vectors used to precondition the received signals such that orthogonal symbol streams are recovered at the receiver, which can simplify the receiver processing. Water-pouring analysis is used to more optimally allocate the total available transmit power to the eigen-modes, which then determines the data rate and the coding and modulation scheme to be used for each eigen-mode.

    摘要翻译： 用于在发射机和接收机处理数据传输的技术。 在一方面，提供了使用频域奇异值分解和“注水”结果在发射机和接收机处导出时域脉冲整形和波束导引解决方案的时域实现。 在发射机处执行奇异值分解以确定MIMO信道的本征模式（即，空间子信道），并导出用于“调节前”调制符号的第一组导引向量。 奇异值分解也在接收机处执行，以导出用于预处理接收信号的第二组导引向量，使得在接收机处恢复正交符号流，这可以简化接收机处理。 水浇注分析用于更好地将总可用发射功率分配给本征模式，该特征模式确定了要用于每个本征模式的数据速率和编码和调制方案。