一种新型空间相关MIMO信道选择算法及其性能分析

A Novel Antenna Selection Algorithm for MIMO under Correlated Channels

讨论了在空间相关MIMO(multiple-input multiple-output)信道中一种新型天线选择算法.先前的天线选择算法只能满足最大容量和最小误码率性能中的一个,而不能同时保证两者性能的最优化,提出的算法旨在寻求两种性能最优化的一种权衡.性能分析表明:1)针对2×5多天线系统,所提算法比基于最大化容量算法能用很小的容量损失来获得更优的误码率性能;2)在强相关信道下,天线选择对系统性能有较好的提高;3)所提出的算法能满足两种性能最优化的权衡.

In this paper, a new antenna selection algorithm is proposed for multiple-input multiple-output （MIMO） wireless communication systems. It is assumed that the channel state information （CSI） is exactly known at the receiver ; hence the antenna selection is considered only at the receiver. The goal of antenna selection is to find a tradeoff between the maximization of the channel capacity and the minimization of the pair-wise error probability （PEP）, which turns out that the scheme of antenna selection plays an important part when dealing with high antenna correlation. It is shown that the proposed scheme for a system with two-transmit antennas and five-receive antennas offers better PEP performance than the algorithm based on the maximization capacity with little capacity loss. The simulation results indicate that the proposed scheme can meet the capacity maximization and the PEP minimization.