基于卫星移动MIMO系统的天线相关性性能分析

Performance analysis of antenna correlation on land mobile satellite based MIMO systems

研究了卫星移动MIMO系统中,上、下行信道存在阴影衰落和空间相关条件下的系统性能,利用围线积分、留数定理及特殊函数积分等方法推导了系统中断概率(OP),平均符号错误概率(SER)的闭合表达式。利用Monte-Carlo仿真分析了系统在不同相关系数、天线数目及调制方式下的性能表现。仿真结果表明,尽管阴影衰落和空间相关性降低了系统性能,但与单天线系统相比,卫星移动MIMO系统的OP及SER改善明显。

The joint effect of spatial correlation and shadowing of channels on the performance of land mobile satelliteMIMO system was analyzed. With the help of contour integral, residue theorem and integral of special functions,closed-form approximations of the outage probability （OP） and the average symbol error rate （SER）were derived. TheMonte Carlo simulations results were illustrated through several examples in order to assess the impact of correlation co-efficient, the number of antenna and different modulation mode on the performance. It shows that although channel cor-relation and shadowing degrade system gain, significant performance gains can be obtained by multi-satellite MIMOsystems compared to relevant single-input single-output （SISO） ones.