Nakagami-m Keyhole衰落信道下MIMO系统容量及天线选择

Capacity and Antenna Selection of MIMO System over Keyhole Nakagami-m Fading Channels

本文全面地分析了在Nakagami-m衰落信道下具有“匙孔”(keyhole)效应时正交块空时编码(STBCs)的多输入多输出(MIMO)系统的容量以及误比特率(BER)性能,导出了该系统环境下平均容量的紧下边界值,同时得出了系统中断概率的具体表达式及其误码率的近似值.在此基础上分析了Keyhole MIMO信道下的天线选择问题.最后进行了仿真,其结果与理论分析一致.研究表明,在Keyhole MIMO信道中,采用天线选择仍然能够获得与全复杂系统相同的分集增益.

We present a comprehensive analysis for the capacity and bit-error rate （BER） performance of orthogonal space-time block codes （STBCs） over Nakagami fading channels in the presence of keyholes of in multiple-input multiple-output （MIMO）. We first derive a tight lower capacity bound. We also present the exact expression for the outage probability and an approximated BER formula. On this basis, we analyze the antenna selection problem over keyhole MIMO channels. Finally numerical results are presented to verify our analysis. It is shown that the diversity order, with antenna selection, is maintained as that of the full complexity system.