有限反馈SDMA系统中信道矩阵的逐列量化算法

摘要

针对多天线广播信道(MIMO BC)块对角化(BD)预编码空分多址接入(SDMA)系统对角化预编码时,直接量化信道矩阵的有限反馈方法复杂度过高的问题,利用系统中用户配置多个天线的特点,提出了基于天线合并逐列量化(PCQ)信道矩阵的有限反馈方法.该方法对接收信号做多次天线合并,将传统算法中直接量化信道矩阵转变为多次量化等效信道矢量,仿真结果表明,在总的反馈比特数相同的情况下,该方法以较少的和容量损失换来了复杂度的大幅降低.%In consideration of the very high complexity of the limited feedback method to directly quantize the channel matrix for block diagonalization(BD)precoding in multiple input multiple output broadcast channel (MIMO BC) space division multiple access (SDMA) systems, the paper proposes a new limited feedback method based on the antenna combining and the per column quantization (PCO) of channel matrixes according to the characteristic that each user has more than one antennas. The new method converts the direct matrix quantization into a series of vector quantizations, thus reducing the complexity considerably. The simulations show that the PCQ algorithm is efficient in complexity reduction, only with a slight performance degradation.