分布式MIMO系统小区平均遍历容量分析

The average ergodic capacity analysis for distributed MIMO antenna systems

针对分布式MIMO系统的圆形小区平均遍历容量展开研究。文章首先建立了包含快衰落、阴影衰落和路径损耗的复合衰落信道模型;然后,对分布式天线采用覆盖式(BT)传输策略,并在高信噪比条件下,导出给定移动台位置时,区上、下行点对点链路遍历容量表达式。最后,考虑移动台在小区内任意分布特点,进一步推导出小区平均遍历容量闭合近似表达式。仿真结果表明,所推导的近似表达式可很好的反应系统的实际性能。导的近似表达式可很好的反应系统的实际性能。

The article will study the average ergodic capacity for distributed MIMO antenna systems in a circular area.Firstly,we＇ 11 establishe a composite channel model which includes fast fading,shadow fading and path loss.Then,distributed antenna cover transmission strategy is emploied,by giving the mobile station＇s location,we deduce the point-to-point uplink and downlink ergodic capacity theory expression at high SNR.Finally,considering the mobile station arbitrary distribution characteristics in the neighborhood,we further deduce the average ergodic capacity closed approximate expression.The simulation results show that the theoretical expression can accurately react the actual system performance.