相关MIMO信道下空间分集系统中多用户分集性能  

Performance of multiuser diversity in a spatial diversity system under MIMO correlated channels

作　　者：芮贤义[1] 金荣洪[1] 耿军平[1] 

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《电波科学学报》2008年第5期937-941,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目(No.F010402/6050106)

摘　　要：多用户MIMO(Multi-input multi-output)系统中,研究空间相关对联合空间分集和多用户分集的性能影响。推导了接收天线之间存在相关的多用户MIMO STBC(Space-time block coding)和MIMO MRT/MRC(Maximum-ratio-transmis-sion/maximal-ratio-combining)系统的中断容量、平均容量表达式,并由此进行性能分析。计算机仿真验证了理论分析的有效性。结果表明,相对于闭环的多用户MIMO MRT/MRC系统,空间相关下开环的多用户MIMO STBC系统具有较低的平均容量和较高的调度增益。In a multiuser multi-input multi-output （MIMO） system, the impact of spatial correlation on the combination of spatial diversity and multiuser diversity is investigated. Exact expressions for outage capacity and average capacity of multiuser diversity system combined with MIMO space-time block coding （STBC） and MIMO maximum-ratio-transmission/maximal-ratio-combining （MRT/MRC） respectively are derived in receive-correlated channels, and based on them, system capacity is analyzed. The analytical results are validated by the simulated results, and the multiuser open-loop MIMO STBC system has a smaller average capacity and larger scheduling gain than the multiuser closed-loop MIMO MRT/MRC system over receive-correlated Rayleigh fading channels.

关 键 词：多用户分集 空间分集 多输入多输出系统 空间相关 调度增益 

分 类 号：TN911[电子电信—通信与信息系统]