空时相关复合衰落多输入多输出信道模型研究  

On the spatial-temporal correlated MIMO channel model under composite fading

作　　者：朱秋明[1,2] 周生奎[1] 张小飞[1] 陈小敏[1] 徐大专[1] 刘星麟[1] 

机构地区：[1]南京航空航天大学雷达成像与微波光子技术教育部重点实验室,江苏南京210016 [2]中国空空导弹研究院,河南洛阳471009

出　　处：《电波科学学报》2015年第4期661-667,共7页Chinese Journal of Radio Science

基　　金：航空科学基金(基金号20120152001);中国博士后科学基金(2013M541661);中央高校基本科研业务费青年科技创新基金(NS2015046);江苏高校优势学科建设工程资助

摘　　要：针对多输入多输出(Multiple-Input Multiple-Output,MIMO)无线传播环境,综合考虑路径损耗、阴影衰落和多径衰落影响,提出一种基于Nakagami-Lognormal分布的相关复合衰落MIMO信道模型,推导并获得各信道自相关和互相关系数的理论表达式;提出一种基于谐波叠加思想的复合衰落MIMO信道仿真方法,并分析了该方法输出信道衰落的空时相关特性.数值仿真结果表明:仿真模型输出统计特性均与理论模型吻合;各子信道之间存在互相关性且随阴影衰落方差减小而下降,而自相关性则呈现快速起伏并缓慢下降的特性.For the wireless propagation environment of multiple-input multiple-output(MIMO)system,a stochastic reference MIMO channel model with spatial-temporal correlation is proposed,which models the combined fading caused by path loss,shadowing and multipath fading as Nakagami-Lognormal fading.Then,the theoretical expressions for auto-correlation and cross-correlation coefficients are derived.Additionally,a modified simulation method based on sum-of-sinusoids is proposed and the spatial-temporal correlation characteristics for this simulation model are also analyzed.Numerical simulation results show that the output statistical features agree well with the reference model,and the cross-correlation between sub-channels is always existing and becomes smaller as shadowing spread decreasing,while the auto-correlation changes rapidly and drops slowly.

关 键 词：复合衰落 多输入多输出 信道模型 空时相关性 谐波叠加 

分 类 号：TN919.3[电子电信—通信与信息系统]