基于信号协方差的MMSE接收机设计

讨论多天线接收机,利用接收信号的协方差识别信道,并在此基础上计算使得输出信噪比最高的MMSE接收机。该算法仅仅依赖信号的二阶统计特性,可以不需要额外的训练码或者仅仅使用一个符号的训练码。由于协方差矩阵不依赖于信号的绝对时间,使得该算法能适用于尚未建立精确时间同步的环境。理论和仿真还表明所提出的方法的性能对系统中的加性高斯白噪声不敏感。

MMSE Receiver Design Based on Signal Covariance

In this paper,we discuss the channel identification and MMSE signal estimation algorithm of multiple-antenna receivers.The algorithm is based on the second order statistics of the received signal,i.e.covariance matrix of the signal,without the need for training signal or only using one training symbol.Since the estimation of covariance doesn't rely on the absolute time of the signal,it is applicable for the case when precise synchronization is not established.Theory and simulation also show that the proposed method is insensitive to additive Gaussian Noise in the system.