相关衰落信道发射天线选择系统的性能分析

Performance analysis of the transmitt antenna selection system in correlated fading channels

文章研究了接收天线空间相关条件下组合发射选择/最大比合并方法(TAS/MRC)的性能;导出了准确错误概率的上限,以及信道参数对系统性能的影响。性能分析表明:采用不相关的发射和接收天线,TAS/MRC方法能实现满分集增益;随着接收相关的增强,系统的分集增益减小,性能下降;反之,系统的编码增益增大,从而对系统性能的下降有一定的抵消作用。

In this paper, th~ performance of a scheme of combining transmit antenna selection and maximal-ratio combining（TAS/MRC） is studied for the case of spatial receive correlation. The upper bound of the probability of exact errors is derived as a function of the channel parameters, which explicitly includes the impact of channel parameters on the performance of the system. Performance analysis shows that with uncorrelated transmit and receive antennas the TAS/MRC scheme can achieve full diversity gains and if all the transmit antennas are used, the diversity gains of the system decrease as receive correlation increases and degrades the performance of the system. On the contrary, increased spatial correlation leads to the increased coding gains of the system and cancels out a part of degraded performance.