不完全信道统计信息反馈下的MIMO系统容量  

Capacity Analysis of MIMO Systems with Incomplete Statistical Channel State Information Feedback

作　　者：杜维 罗敬原 周雯[1] DU Wei;LUO Jingyuan;ZHOU Wen(College of Information Science and Technology,Nanjing Forestry University,Nanjing 210018,China)

机构地区：[1]南京林业大学信息科技学院,江苏南京210018

出　　处：《无线电工程》2019年第5期363-368,共6页Radio Engineering

基　　金：国家自然科学基金项目(61601275);江苏省大学生创新创业训练项目(201810298024Z);南京林业大学大学生创新创业训练项目(2017NFUSPITP244)

摘　　要：容量是MIMO通信系统设计的重要因素,针对不完全统计信道信息反馈下的MIMO系统,推导了闭环系统的容量表达式,并且给出反馈信噪比门限的表示式,该门限确保闭环系统容量不小于开环容量。仿真实验研究了反馈信噪比对系统容量的影响,对比了若干典型反馈方式下的系统容量,分析了不同系统的配置参数对反馈信噪比门限的影响。结果表明,反馈信噪比高于某门限时,系统容量高于开环容量,反之相反,反馈信噪比门限随着系统信噪比的增加而增加。Capacity is an important factor in the design of MIMO communication systems.The study of capacity of MIMO systems with incomplete statistical channel state information (CSI) feedback can derive the expression of the closed-loop MIMO system capacity and provide the expression of the feedback signal-to-noise ratio (SNR),which will guarantee the closed-loop capacity is no less than the open-loop capacity.Computer simulation is deployed to study the effect of feedback SNR on system capacity,to compare system capacities with several classic feedback methods,and to analyze the effect of different system configurations on the feedback SNR threshold.The results show that the system capacity is larger than open-loop capacity when the feedback SNR is larger than a threshold,otherwise the opposite.The feedback SNR threshold increases with increasing system SNR.

关 键 词：多输入多输出 信道统计信息 系统容量 

分 类 号：TN929.5[电子电信—通信与信息系统]