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    • 49. 发明申请
    • SYSTEM FOR SOFT SYMBOL DECODING MIMO LOG-MAP DETECTION
    • 用于软件符号解码MIMO日志映射检测的系统
    • US20100111234A1
    • 2010-05-06
    • US12629282
    • 2009-12-02
    • Didier Johannes Richard van NeeVincent Knowles Jones, IVGeert Arnout AwaterJames Gardner
    • Didier Johannes Richard van NeeVincent Knowles Jones, IVGeert Arnout AwaterJames Gardner
    • H04L27/06
    • H04L27/2032H04L25/03006H04L25/067H04L2025/03414H04L2025/03426
    • A soft symbol decoder for use in a multiple input multiple output (MIMO) and OFDM (orthogonal frequency division multiplexing) system. The decoder generates soft symbol values for a digital signal that represents a number of source bits. The source bits are transmitted as symbols in corresponding to points in a signaling constellation. Soft metrics are determined by searching for all possible multi-dimensional symbols that could have been transmitted. The method includes transmitting a sample of the multi-dimensional symbol using K transmit antennas. The multi-dimensional symbol is represent-able as a complex, K-dimensional vector x. Each vector component of vector x represents a signal transmitted with one of the K transmit antennas. After transmission through a communication channel, a sample corresponding to the transmitted sample is received. The received sample is represented by a complex, N-dimensional vector y, where N is the number of receive antennas in the MIMO system. After the sample is received, a soft metric L(bi) is determined for each bit bi encoded by x according to the equation: L  ( b i ) = σ - 2 · ( min x j  b i = - 1   y - Hx j  2 - min x j  b i = + 1   y - Hx j  2 ) , , and xj represents all possible values for x. In addition, a reduced complexity method is used for providing soft metric values in the MIMO system. This exemplary aspect reduces the complexity of the above computations from 2BK to 2B(K-1), where B is the number of bits transmitted per symbol per antenna.
    • 一种用于多输入多输出(MIMO)和OFDM(正交频分复用)系统的软符号解码器。 解码器产生表示多个源位的数字信号的软符号值。 源比特在对应于信令星座中的点被作为符号发送。 通过搜索可能已经发送的所有可能的多维符号来确定软度量。 该方法包括使用K个发送天线发送多维符号的采样。 多维符号可以表示为复杂的K维向量x。 矢量x的每个矢量分量表示与K个发射天线中的一个发射的信号。 在通过通信信道传输之后,接收对应于发送的样本的样本。 接收的样本由复数N维向量y表示,其中N是MIMO系统中的接收天线的数量。 在接收到样本之后,根据以下等式为由x编码的每个比特bi确定软度量L(bi):L(b i)=&sgr; - 2·(min x jb i = - 1y - Hx j2 - min x jb i = + 1y-Hx j2),xj表示x的所有可能值。 另外,降低复杂度的方法用于在MIMO系统中提供软度量值。 该示例性方面降低了从2BK到2B(K-1)的上述计算的复杂度,其中B是每个天线每符号发送的比特数。