To estimate the impact of spatial fading correlation (SFC) of receiving signals of MIMO (MIMO,Multiple input multiple output) antenna elements on the performance of system,this paper made detailed and in-depth investigation on commonly used azimuth power spectrums (APS) of arrival signals such as Uniform,Gaussian and Laplace distributions.Spatial fading correlation coefficients of different APS distributions for MIMO arraymulti-antenna systems were analyzed.Meanwhile,generally accurate and approximate expressions of SFC coefficients were derived.The paper illuminated underlying mechanism between distribution of arrival signals and MIMO multi-antenna array and superiority and limitations of approximate algorithm.The results provide theoretical guidance and research base for MIMO multi-antenna layout and design.%文中对常用的波达信号在拉普拉斯(Laplace)角谱分布函数进行深入的研究.分析MIMO阵列多天线系统在波达信号角功率谱分布下的衰落相关系数并推导出了其通用精确和近似表达式.阐明了波达信号分布与MIMO阵列间的内在机理及近似算法的优越性和使用限制条件,进而提出了改进型的空间散射体分布模型的波达信号角谱分布.研究结果为未来5G MIMO多天线布局和设计提供了理论指导和研究基础.
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