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    • 6. 发明授权
    • Rotating reference codebook that is used in a multiple-input multiple-output (MIMO) communication system
    • 在多输入多输出(MIMO)通信系统中使用的旋转参考码本
    • US08488708B2
    • 2013-07-16
    • US12819428
    • 2010-06-21
    • Junil ChoiBruno ClerckxKi Il Kim
    • Junil ChoiBruno ClerckxKi Il Kim
    • H04L1/02
    • H04B7/0417
    • A rotating reference codebook used in a multiple input multiple output (MIMO) communication system is provided. The reference codebook includes codewords from a discrete Fourier transform (DFT) codebook. A base station and a terminal may calculate a rotation matrix based on a previous preferred codeword and a random codeword among codewords included in the DFT codebook. A reference codebook may be rotated using the rotation matrix and may be transformed to a new codebook. The reference codebook may include codewords of a polar cap codebook and the codewords of the DFT codebook. Even though the codewords of the DFT codebook are rotated, the codewords of the DFT codebook may remain in the new codebook as elements of the DFT codebook.
    • 提供了一种在多输入多输出(MIMO)通信系统中使用的旋转参考码本。 参考码本包括来自离散傅里叶变换(DFT)码本的码字。 基站和终端可以基于DFT码本中包括的码字中的先前优选码字和随机码字来计算旋转矩阵。 参考码本可以使用旋转矩阵旋转,并且可以被转换为新的码本。 参考码本可以包括极性码本码字的码字和DFT码本的码字。 即使旋转DFT码本的码字,DFT码本的码字也可以作为DFT码本的元素而保留在新码本中。
    • 9. 发明授权
    • System for feeding back index of codeword matrix
    • 用于反馈码字矩阵索引的系统
    • US08160125B2
    • 2012-04-17
    • US12109440
    • 2008-04-25
    • Bruno ClerckxSung Jin KimKi Il KimDavid J. LoveTaejoon Kim
    • Bruno ClerckxSung Jin KimKi Il KimDavid J. LoveTaejoon Kim
    • H04B1/38H04B7/02H04L1/02
    • H04B7/0639
    • A system is provided for performing downlink beamforming based on information fed back by a mobile station. The mobile station includes a channel matrix generation unit to generate a channel matrix with respect to channels ranging from a base station to a mobile station, the base station including multiple transmission antennas, a codebook updating unit to generate a second codebook including a plurality of second codeword matrixes based on the generated channel matrix and a first codebook including a plurality of first codeword matrixes, a codeword selection unit to select at least one transmission codeword matrix from among the plurality of second codeword matrixes, a transmission unit to transmit an index of the selected transmission codeword matrix to the base station, and a receiving unit to receive data transmitted from the base station via the multiple transmission antennas.
    • 提供一种用于基于由移动台反馈的信息来执行下行链路波束成形的系统。 移动站包括:信道矩阵生成单元,生成相对于从基站到移动站的信道的信道矩阵,所述基站包括多个发送天线,码本更新单元,生成包含多个秒的第二码本 基于生成的信道矩阵的码字矩阵和包括多个第一码字矩阵的第一码本,从所述多个第二码字矩阵中选择至少一个发送码字矩阵的码字选择单元,发送所述多个第一码字矩阵的索引的发送单元, 所选择的发送码字矩阵到基站,接收单元经由多个发送天线接收从基站发送的数据。