MIMO无线通信系统的随机信道性能分析

Stochastic Channel Performance Analysis of MIMO Wireless Communication System

针对MIMO无线通信系统在随机相关衰落信道下的系统性能进行了全面研究。首先通过对恒定信道和秩亏信道的容量分析以及随机相关瑞利衰落信道的建模研究,提出了样本平均中断容量指标,并将其应用于发射机侧具有不同信道知识的信道容量计算中,从而得到瞬时信道容量;其次,通过对不同信道特征情形下的接收机接收功率分析,提出了多流传输和发射机侧在不同信道知识下的MIMO天线增益的计算公式,最后提出了实际可实现MIMO系统在有限块码长和误差概率情形下的瞬时截止速率;仿真实验结果表明,针对MIMO系统的随机相关瑞利衰落信道的建模及其提出的性能指标理论计算公式是有效和实际可行的。

The performance of MIMO wireless communication system under stochastic correlation fading channel is studied.Firstly,through the capacity analysis of constant channel and rank deficit channel and the modeling study of stochastic correlation Rayleigh fading channel,the sample average outage capacity is proposed and applied to the calculation of channel capacity with different channel knowledge at the transmitter side,so as to obtain instantaneous channel capacity.Secondly,by analyzing the received power of the receiver under different channel characteristics,the formulas of multi-stream transmission and the gain of the MIMO antenna at the transmitter side under different channel knowledge are proposed.Finally,the instantaneous cutoff rate of the actual implementation of MIMO system under the condition of finite block code length and error probability is proposed.The simulation experimental results show that the modeling of stochastic correlation Rayleigh fading channel and the theoretical calculation formula of performance index for MIMO system are effective and practical.