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45 条记录 (耗时 0.016 秒)

    ADAPTIVE COMPRESSION OF CHANNEL FEEDBACK BASED ON SECOND ORDER CHANNEL STATISTICS
    2.
    发明公开
    ADAPTIVE COMPRESSION OF CHANNEL FEEDBACK BASED ON SECOND ORDER CHANNEL STATISTICS 审中-公开
    自适应KOMPRIMIERUNG VONKANALRÜCKKOPPELUNGAUF DER BASIS VON KANALSTATISTIKEN ZWEITER ORDNUNG

    公开(公告)号：EP3035578A1

    公开(公告)日：2016-06-22

    申请号：EP16150123.4

    申请日：2008-07-11

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： HUI, Dennis ,  KRASNY, Leonid

    IPC分类号： H04L1/00

    CPC分类号： H04L1/0026 ,  H04L1/0019 ,  H04L1/0029 ,  H04L1/003

    摘要： A method of variable rate vector quantization reduces the amount of channel state feedback. Channel coefficients of a communication channel are determined and second order statistics (e.g., variances) of the channel taps are computed). Bit allocation for the channel taps are determined based on the coefficients statistics. The channel taps are individually quantized at rates determined based on said bit allocations.

    摘要翻译： 可变速率矢量量化的方法减少了信道状态反馈的量。 确定通信信道的信道系数，并且计算信道抽头的二阶统计量（例如，方差））。 基于系数统计确定信道抽头的位分配。 以基于所述位分配确定的速率单独地量化信道抽头。

    PRE-CODING FOR FREQUENCY SELECTIVE RADIO COMMUNICATION CHANNELS
    5.
    发明公开
    PRE-CODING FOR FREQUENCY SELECTIVE RADIO COMMUNICATION CHANNELS 审中-公开
    预编码频率选择无线通信信道

    公开(公告)号：EP2204024A1

    公开(公告)日：2010-07-07

    申请号：EP07835104.6

    申请日：2007-10-15

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： LINDGREN, Ulf ,  KRASNY, Leonid ,  SAHLIN, Henrik

    IPC分类号： H04L25/03

    CPC分类号： H04L25/03343 ,  H04B7/0617 ,  H04B7/0626 ,  H04L2025/03426 ,  H04L2025/03802

    摘要： The present invention relates to a method for processing signals to be transmitted in a MIMO system (10; 28) from a transmitter A, B; C having at least two transmitting antennas (11-12, 13-14; 29-31) to a receiver A, B; D having at least two receiving antennas (11- 12, 13-14; 32-34) on a frequency selective communication channel. The method comprises estimating elements of a channel matrix H(Q-1) based on time delays and complex valued coefficients associated with the communication channel to provide an estimated frequency variation function of each element of the channel matrix, and pre-coding the signals to be transmitted based on the estimated frequency variation function for each element. The invention also relates to a MIMO system; and a transmitter and a receiver for use in a MIMO system.

    METHOD AND APPARATUS FOR SUPPRESSING COMMUNICATION SIGNAL INTERFERENCE
    7.
    发明公开
    METHOD AND APPARATUS FOR SUPPRESSING COMMUNICATION SIGNAL INTERFERENCE 有权
    方法和设备，为削减通信信号干扰

    公开(公告)号：EP1792412A1

    公开(公告)日：2007-06-06

    申请号：EP05790891.5

    申请日：2005-09-12

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： CAIRNS, Douglas ,  KRASNY, Leonid

    IPC分类号： H04B1/707 ,  H04L25/03

    CPC分类号： H04L25/03006

    摘要： A frequency domain representation of a whitening filter is made to depend on essentially one unknown, namely, a scaling factor that is based on an estimated ratio of total base station power to the power spectral density (PSD) of inter-cell interference plus noise. In turn, that scaling factor can be computed based on the modeling terms used in a parametric model of the impairment correlations for a received communication signal. Preferably, the model comprises an interference impairment term scaled by a first model fitting parameter, and a noise impairment term scaled by a second model fitting parameter. Further, the scaling factor can be computed by directly estimating total base station transmit power and the PSD of inter-cell interference plus noise. In any case, the whitening filter can be used in whitening a received communication signal in conjunction with channel equalization processing or RAKE receiver processing, for example.