存在估计误差的有限反馈MIMO性能分析  

Performance Analysis of Multi-user MIMO Limited Feedback System in the Presence of Channel Estimation Error

作　　者：杨喆[1] 邱玲[1] 

机构地区：[1]中国科学技术大学个人通信与扩频实验室,安徽合肥230027

出　　处：《通信技术》2010年第4期72-74,77,共4页Communications Technology

基　　金：国家863项目(NO:2006AA01Z266);国家973项目(NO:2007CB310602)资助课题

摘　　要：考虑的是利用有限反馈技术的下行多用户多天线系统。接收端通过信道估计获得信道状态信息,采用随机矢量量化信道信息并反馈码子的序号,发送端利用部分信道信息,采用波束成型的预编码技术实现多用户数据传输。考虑接收端信道估计存在误差,并对由此带来的系统性能影响进行分析,给出吞吐率损失的上界,以及使有限反馈系统保持固定空分复用增益,信道估计误差方差的限制条件和反馈比特数随发送功率的变化关系。A multi-user multiple-antenna downlink system with limited feedback is discussed.Firstly,the receiver,through channel estimation,acquires the Channel State Information（CSI）,then the Random Vector Quantization is adopted to quantize the CSI to a codeword,whose index is then transmitted to the transmitter through the feedback channel.With the partial CSI,multi-user data is distributed by precoding in the transmitter.This paper tells of the Channel Estimation Error（CEE） and analyzes the system performance in the presence of CEE.Also,this paper presents the CEE restriction as well as the principle of feedback bits variation according to the transmite power,thus to maintain the spatial multiplexing gain.

关 键 词：有限反馈 随机矢量量化 信道估计误差 

分 类 号：TN929.533[电子电信—通信与信息系统]