Interpolation in channel state feedback
    43.
    发明授权
    Interpolation in channel state feedback 有权
    通道状态反馈插值

    公开(公告)号:US07961802B2

    公开(公告)日:2011-06-14

    申请号:US12424259

    申请日:2009-04-15

    IPC分类号: H04K1/10 H04L27/28

    摘要: Feedback bandwidth may be reduced in a closed loop MIMO system by Householder transformations, vector quantization using codebooks, and down-sampling in the frequency domain. A column of a beamforming matrix is quantized using a codebook, a Householder reflection is performed on the beamforming matrix to reduce the dimensionality of the beamforming matrix, and the quantizing and performing of Householder reflection on the previously dimensionality reduced beamforming matrix is recursively repeated to obtain a further reduction of dimensionality of the beamforming matrix. These actions are performed for a subset of orthogonal frequency divisional multiplexing (OFDM) carriers, and quantized column vectors for the subset of OFDM carriers are transmitted.

    摘要翻译: 在闭环MIMO系统中,通过Householder变换,使用码本的矢量量化和频域中的下采样可以减少反馈带宽。 使用码本对波束成形矩阵的列进行量化,对波束成形矩阵执行Householder反射以减小波束成形矩阵的维数,并且递归地重复量化并执行先前维数减小的波束形成矩阵中的Householder反射以获得 波束形成矩阵的维度的进一步降低。 对于正交频分复用(OFDM)载波的子集执行这些动作,并且发送用于OFDM载波子集的量化列向量。

    Relays in wireless communication networks
    44.
    发明授权
    Relays in wireless communication networks 有权
    无线通信网络中的继电器

    公开(公告)号:US07907540B2

    公开(公告)日:2011-03-15

    申请号:US11959351

    申请日:2007-12-18

    IPC分类号: H04J1/16

    摘要: Methods and apparatus for transmitting packets in wireless communication networks are disclosed. The methods include a relay mobile station measuring channel quality between the relay mobile station and a destination mobile station in response to a request for relay mobile stations from a base station The relay mobile station reports a channel quality indicator to the base station if the channel quality for a link between the base station and the destination mobile station via the relay mobile station is greater than a predetermined channel quality. The base station determines the relay mobile station that provides an optimal route for transmitting the packets from the base station to the destination mobile station.

    摘要翻译: 公开了在无线通信网络中传送分组的方法和装置。 所述方法包括响应于从基站对中继移动台的请求,测量中继移动台和目的地移动台之间的信道质量的中继移动台。如果信道质量,中继移动台向基站报告信道质量指示符 用于基站和目的地移动台之间经由中继移动站的链路大于预定信道质量。 基站确定提供用于从基站向目的地移动台发送分组的最佳路由的中继移动台。

    Differential codebook for a wireless network, MIMO beamforming system using same, and method of reducing a quantization error in a MIMO beamforming system for a wireless network using same
    45.
    发明申请
    Differential codebook for a wireless network, MIMO beamforming system using same, and method of reducing a quantization error in a MIMO beamforming system for a wireless network using same 审中-公开
    用于无线网络的差分码本,使用该无线网络的MIMO波束成形系统以及使用该无线网络的用于使用无线网络的MIMO波束形成系统中的量化误差的方法

    公开(公告)号:US20100226357A1

    公开(公告)日:2010-09-09

    申请号:US12658105

    申请日:2010-02-02

    IPC分类号: H04B7/216 H04K1/10

    摘要: A differential codebook for a wireless network includes a plurality of codewords and [e1 . . . eNs] G as a center location of the plurality of codewords, where ek represents a column vector comprising a plurality of rows including a k-th row and in which an entry on the k-th row is one and entries on each of the plurality of rows except for the k-th row are zero, where G is any Ns by Ns unitary matrix including the identity matrix, and where Ns, represents a number of spatial streams in the wireless network. At least two of the plurality of codewords are symmetric about the center location.

    摘要翻译: 无线网络的差分码本包括多个码字,[e1。 。 。 eNs] G作为多个码字的中心位置,其中ek表示包括包括第k行的多行的列向量,并且其中第k行中的条目是1,并且多个行中的每一个上的条目 除了第k行以外的行是零,其中G是包括单位矩阵的任何Ns乘Ns酉矩阵,并且其中Ns表示无线网络中的空间流的数量。 多个码字中的至少两个码字关于中心位置是对称的。

    DOWNLINK TRANSMIT BEAMFORMING
    46.
    发明申请
    DOWNLINK TRANSMIT BEAMFORMING 有权
    下行发射波束形成

    公开(公告)号:US20100189068A1

    公开(公告)日:2010-07-29

    申请号:US12752517

    申请日:2010-04-01

    IPC分类号: H04W72/04

    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。

    Filling the space-time channels in SDMA
    49.
    发明申请
    Filling the space-time channels in SDMA 审中-公开
    填写SDMA中的空时通道

    公开(公告)号:US20100002677A1

    公开(公告)日:2010-01-07

    申请号:US12584780

    申请日:2009-09-10

    IPC分类号: H04J3/00

    摘要: Embodiments of the present invention provide an apparatus capable of filling space-time channels in Spatial-Division Multiple-Access (SDMA) in a Medium Access Control (MAC) protocol, comprising, a base station operable in a wireless network and adapted for uplink and downlink multi-user and multi antenna operation, the base station including a MAC scheduler to schedule transmissions using packet scheduling in the wireless network, and wherein the MAC scheduler schedules variable length packets for transmission using packet scheduling in the wireless network based on transmission times to transmit on each of M spatial channels to mobile stations operable in the wireless network by filling the M spatial channels using data packets buffered for the mobile stations operable to communicate with the base station.

    摘要翻译: 本发明的实施例提供一种能够在介质访问控制(MAC)协议中填充空分多址(SDMA)中的时空信道的装置,包括:可在无线网络中操作并适用于上行链路和 下行链路多用户和多天线操作,所述基站包括MAC调度器,以在所述无线网络中使用分组调度来调度传输,并且其中所述MAC调度器基于传输时间在所述无线网络中调度可变长度分组以进行传输, 通过使用为可操作以与基站进行通信的移动站缓冲的数据分组来填充M个空间信道,将M个空间信道中的每一个发送到在无线网络中可操作的移动站。

    Filling the space-time channels in SDMA
    50.
    发明申请
    Filling the space-time channels in SDMA 有权
    填写SDMA中的空时通道

    公开(公告)号:US20090323627A1

    公开(公告)日:2009-12-31

    申请号:US12584144

    申请日:2009-09-01

    IPC分类号: H04W72/12

    摘要: Embodiments of the present invention provide an apparatus, comprising a base station operable in a wireless network, the base station including a scheduler, and wherein the scheduler schedules variable length packets for transmission based on transmission times to transmit on each of M spatial channels to mobile stations operable in the wireless network by filling the M spatial channels using data packets buffered for the mobile stations.

    摘要翻译: 本发明的实施例提供一种装置,包括可在无线网络中操作的基站,所述基站包括调度器,并且其中所述调度器基于传输时间调度可变长度分组以进行传输,以便在每个M个空间信道上传输到移动台 通过使用为移动站缓冲的数据分组来填充M个空间信道,可在无线网络中操作的站。