非理想信道条件下的V-BLAST系统检测算法

Detection Algorithm of V-BLAST System Under Imperfect Channel Condition

针对信道相关条件下同时存在信道估计误差的V-BLAST系统,提出了一种基于MMSE准则的检测算法,推导了接收均衡矩阵的计算式,同时也给出了相应的最佳排序策略。仿真结果表明,本文提出的算法比传统算法以及仅考虑信道估计误差影响的算法性能更优,当信噪比较高以及收发天线数目较多时,优势更明显。该算法要求接收端已知信道估计误差的方差以及收发天线之间的相关矩阵等参数信息,但系统性能对这些参数的估计值有较强的鲁棒性,当参数估计不准确时,该算法性能优势仍然可以在一个较大的容错范围内得以保持。

A detection algorithm based on minimum mean square error MMSE criterion is proposed for V-BLAST system under correlated channels with channel estimation error.Expression of weight matrix is derived,and the ordering strategy is also provided.Simulation results show that the performance of the proposed scheme is superior to that of the conventional algorithm or the one only considering the effect of channel estimation error.The more the number of antennas is in high SNR region,the better advantage can be obtained for the new scheme.The algorithm requires the knowledge of channel estimation error variance,transmit and receive correlation matrix,but its performance is robust to the inaccuracy estimation of these parameters.The superiority can be kept in a wide error-tolerant range when the parameters are estimated inaccurately.