会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 10. 发明申请
    • DIFFERENTIAL CLOSED-LOOP TRANSMISSION FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS
    • 无线通信系统中的差分闭环传输反馈
    • WO2011053501A1
    • 2011-05-05
    • PCT/US2010/053489
    • 2010-10-21
    • MOTOROLA MOBILITY, INC.THOMAS, Timothy, A.MONDAL, BishwarupVISOTSKY, EugeneVOOK, Frederick, W.
    • THOMAS, Timothy, A.MONDAL, BishwarupVISOTSKY, EugeneVOOK, Frederick, W.
    • H04L25/02H04L25/03H04B7/04H04B7/06
    • H04L27/2601H04B7/0617H04B7/0623H04B7/0641H04L25/0242H04L25/03006H04L25/03343H04L2025/03426
    • A method for providing channel feedback is provided herein. During operation, a covariance matrix at time t (R) is calculated as a function of a received downlink signal. A feedback Matrix C t is also calculated and is based on a previous quantized covariance matrix (R q t-1 ), the covariance matrix (R) at time t, and a forgetting factor ( ϒ ) that is applied to R q t-1 . The matrix C t is then used to create a DERC feedback message (signal or waveform) and may be transmitted with pilots on a proper feedback channel to a base unit. The base unit receives the feedback matrix (C t ) as a DERC waveform on a proper feedback channel. The base unit uses non-coherent or coherent detection to detect the DERC values send by the remote unit and uses the DERC values with a previous quantized covariance matrix estimate, a forgetting factor, and a weighting value to compute a covariance matrix estimate to use for beamforming. The base unit then uses the covariance matrix estimate to determine appropriate channel beamforming weights, and instructs transmit beamforming circuitry to use the appropriate weights.
    • 本文提供了一种用于提供信道反馈的方法。 在操作期间,计算时间t(R)的协方差矩阵作为接收到的下行链路信号的函数。 还计算反馈矩阵Ct,并且基于先前的量化协方差矩阵(Rq t-1),时间t的协方差矩阵(R)和应用于Rq t-1的遗忘因子(λ)。 矩阵Ct然后用于创建DERC反馈消息(信号或波形),并且可以在适当反馈信道上的导频发送到基本单元。 基本单元在适当的反馈信道上接收反馈矩阵(Ct)作为DERC波形。 基本单元使用非相干或相干检测来检测远程单元发送的DERC值,并且使用具有先前的量化协方差矩阵估计,遗忘因子和加权值的DERC值来计算协方差矩阵估计,以用于 波束成形。 基本单元然后使用协方差矩阵估计来确定适当的信道波束成形权重,并且指示发送波束成形电路使用适当的权重。