空间复用系统在相关信道下的两步选择天线算法

针对采用贝尔实验室垂直分层空时(V-BLAST)检测算法的空间复用系统存在信道相关的问题,提出一种新的两步选择发射天线的准则,首先利用信道矩阵奇异值确定有效发射天线数,然后根据最低检测后信噪比确定发射天线和子数据流之间的映射关系.仿真结果表明两步选择准则能获得比已有算法更高的选择增益,此外还分析并仿真了天线间距和角度扩展对符号向量错误概率的影响.

A two-step antenna selection algorithm for spatial multiplexing in the presence of spatial fading correlation

A two-step antenna selection algorithm is proposed for the spatial multiplexing system with the Vertical-Bell Labs Lay- ered Space-Time (V-BLAST) nonlinear receiver in correlated channel.The basic idea is to separate the optimization into two steps,we first choose the optimal number of substreams in terms of the singular values of the channel matrix,then adapt the mapping of substreams to antennas according to the post-detection SNR.Simulation results illustrate that the proposed two-step selection criterion can obtain the greater selection gain than the existing singular value based selection criterion.Further,we analyze the effects of the angle spread and an- tenna spacing on the probability of vector symbol error.