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为提高准正交空时分组码性能,采用以信噪比最大做为天线选择准则,借助MATLAB对Keyhole信道下的TBH码和Jafarkhani码性能进行仿真,并与瑞利信道下的仿真结果进行比较.结果表明:对于准正交空时分组码系统,由于有匙孔效应,Keyhole信道性能较瑞利信道差很多,而通过天线选择可以提高传输增益,减小误码率.采用接收端、收发两端联合天线选择的方法可显著提高系统性能.
In order to improve the performance of quasi-orthogonal space-time block codes, the maximum signal-to-noise ratio (SNR) is chosen as the antenna selection criterion, the performance of TBH codes and Jafarkhani codes under Keyhole channels is simulated by MATLAB and compared with Rayleigh channel simulation results The results show that for the quasi-orthogonal space-time block code system, the Keyhole channel performance is much worse than the Rayleigh channel due to the keyhole effect, and the transmission gain can be increased and the bit error rate reduced through the antenna selection. The method of joint antenna selection at both ends can significantly improve system performance.