MIMO系统中一种新的接收天线选择算法

在瑞利衰落信道条件下，通过天线选择可以提高多输入多输出（MIMO）系统的容量，并能有效地降低MIMO系统的复杂度和射频成本，天线选择算法也成为问题的关键。对接收天线选择算法进行了研究，通过连续选择使MIMO系统容量增加最大的天线的方法，用矩阵及行列式运算导出了一种新的接收天线选择算法，并通过仿真和分析与其它算法进行了比较。仿真结果表明，新算法在信噪比较小时，有最大的遍历性容量（ergodic capacity）、中断容量（outage capacity）；在信噪比较大时，同其它算法结果十分接近。新算法更适合于在信噪比较小（信号弱或信遭受噪声恶化严重）时使用。将新算法同Alkhansari算法结合起来，结果更好。

A Novel Receiving Antenna Selection Algorithm in MIMO Systems

Antenna selection techniques not only can increase capacity of multiple input multiple output(MIMO) systems,but also can reduce their complexity and cost of RF(radio frequency) chains in Rayleigh fading channels. Hence antenna selection algorithms play an important role in MIMO systems.In this paper,receiving antenna selection algorithms in MIMO systems have been studied and a novel algorithm is proposed.The novel algorithm is based on some matrix and determinants computation.In the novel algorithm,receiving antenna that can offer the best incremental capacity of MIMO system is selected successively.Computational results are also compared with previously published literatures.The results of simulation and analysis show that the maximum ergodic capacity and outage capacity of MIMO systems can be obtained in condition of lower signal noise ratio(SNR)by using the novel receiving antenna selection algorithm,while the results obtained by the novel method are very approximately to that of others.Therefore,it is no difficult to get the conclusion that the novel algorithm is suitable for the case of lower SNR(lower power of signal or channels corrupted badly by noise).Better result could be obtained,if the novel algorithm and Alkhansari algorithm are combinated.