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    DOWNLINK TRANSMIT BEAMFORMING
    41.
    发明申请
    DOWNLINK TRANSMIT BEAMFORMING 审中-公开
    下行发射波束形成

    公开(公告)号：US20140153662A1

    公开(公告)日：2014-06-05

    申请号：US14175381

    申请日：2014-02-07

    申请人： Xintian E. Lin ,  Qinghua Li

    发明人： Xintian E. Lin ,  Qinghua Li

    IPC分类号： H04L1/06 ,  H04B7/04

    CPC分类号： H04B7/0413 ,  H04B7/0617 ,  H04B7/0643 ,  H04L1/0681

    摘要： A wireless network access point can operate as a closed loop MIMO device when communicating with a station that is operating as an open loop MIMO device. Transmit/receive chains in the access point are calibrated to support aggregate channel reciprocity.

    摘要翻译： 当与作为开环MIMO设备操作的站通信时，无线网络接入点可以作为闭环MIMO设备操作。 校准接入点中的发送/接收链以支持聚合信道互易。

    Recursive reduction of channel state feedback
    42.
    发明授权
    Recursive reduction of channel state feedback 有权
    通道状态反馈递归减少

    公开(公告)号：US08743857B2

    公开(公告)日：2014-06-03

    申请号：US13532969

    申请日：2012-06-26

    申请人： Qinghua Li ,  Xintian E. Lin

    发明人： Qinghua Li ,  Xintian E. Lin

    IPC分类号： H04B7/216 ,  H04B7/06 ,  H04B7/04

    CPC分类号： H04B7/0663 ,  H04B7/0417 ,  H04B7/0639

    摘要： A method and a system that multiplies a beamforming matrix by a unitary matrix that does not change the subspace of the beamforming matrix for form a converted matrix having a lower left triangle of zeros. A first column vector having a fewest number of elements of the converted matrix is quantized using a codebook and represented by a first codebook index. A Householder matrix is determined from the quantized first column vector and the converted matrix is multiplied by the Householder matrix. Quantizing, determining a Householder matrix from further column vectors of the converted matrix using a codebook and representing each respective column vector by further corresponding codebook index, and multiplying the converted matrix on the left by the determined Householder matrix for each respective column vector are recursively repeated. The first codebook index and further codebook indices are transmitted to a remote station for use in beamforming.

    摘要翻译： 一种方法和系统，其将波束形成矩阵乘以不改变波束形成矩阵的子空间的单一矩阵，以形成具有零的左下三角形的转换矩阵。 具有转换矩阵的元素数目最少的第一列矢量使用码本量化，并由第一码本索引表示。 从量化的第一列向量确定一个Householder矩阵，并将该矩阵乘以Householder矩阵。 使用码本从转换矩阵的其他列向量中量化，确定房主矩阵，并通过进一步的相应码本索引表示每个相应的列向量，并且将每个相应列向量的左侧的转换矩阵乘以所确定的Householder矩阵递归地重复 。 第一码本索引和其他码本索引被发送到远程站以用于波束成形。

    Retransmission techniques in wireless networks
    47.
    发明授权
    Retransmission techniques in wireless networks 有权
    无线网络中的重传技术

    公开(公告)号：US08650448B2

    公开(公告)日：2014-02-11

    申请号：US12587842

    申请日：2009-10-13

    申请人： Qinghua Li ,  Ozgur Oyman ,  Xintian E. Lin

    发明人： Qinghua Li ,  Ozgur Oyman ,  Xintian E. Lin

    IPC分类号： G08C25/02

    CPC分类号： H04L1/0015 ,  H04L1/0026 ,  H04L1/1864

    摘要： Retransmission techniques are disclosed. These techniques may be used in networks employing contention-based access schemes, such as CSMA. For instance, a device may receive a corrupted packet from a transmitting device, and determine a cause of the corruption. When the determined cause of the corruption is an in-network packet collision, the device allows the transmitting device to send a retransmission of the packet in accordance with a contention-based access scheme. However, when the determined cause of the corruption is other than an in-network packet collision, the device provides retransmission assistance to the transmitting device. This retransmission assistance may include a channel reservation for a retransmission, and/or one or more link adaptation suggestions for the transmitting device.

    摘要翻译： 披露重传技术。 这些技术可以用于采用基于争用的接入方案的网络，例如CSMA。 例如，设备可以从发送设备接收损坏的分组，并且确定损坏的原因。 当所确定的损坏的原因是网络内分组冲突时，设备允许发送设备根据基于竞争的接入方案发送分组的重传。 然而，当所确定的损坏的原因不是网内分组冲突时，设备向发送设备提供重传协助。 该重传辅助可以包括用于重发的信道预留和/或用于发送设备的一个或多个链路适配建议。