中文摘要：

分析了降雨气象环境对MIMO信道容量影响的机理,计算了降雨环境的路径复增益,在降雨环境下以N×N圆阵列天线为例对受降雨环境影响的MIMO信道容量进行了计算,计算结果与无降雨环境的信道容量做了比较分析。计算结果表明降雨环境可以降低MIMO信道容量,特别是如果系统链路较长或者频率较高时影响尤为严重。该研究方法对于研究其他恶劣气象环境（例如雪、雾、沙尘等）对MIMO信道容量影响也适用,研究结果为MIMO系统开发和利用提供了需要克服和考虑的问题以及研究方法和部分计算结果。

英文摘要：

The theory about the effect of rain environment on channel capacity of MIMO systems is given in this paper.And,the path complex gain is computed.The channel capacity of MIMO systems（N×N Uniform Circular Array as an example） affected by rain environment is calculated,which is compared with that found at the condition of usual atmosphere environment,and the results are analyzed.The results show that channel capacity of MIMO system is reduced by the effect of rain environment.And,the longer the path is or the higher the frequency is,the more severe the effect is.The method used in this paper is valid for studying the effect on channel capacity of MIMO systems induced other bad weather（snow,fog,dust storm etc,for example）.The conclusions in this paper give some problems needed to solve,give some ways and calculated results for making use of MIMO system.