一种前向放大中继通信系统中的有限反馈中继预编码方案

Limited Feedback Precoding for Amplify-and-Forward Relaying

本文首先给出了前向放大中继通信系统中,在给定QoS要求下的最优中继预编码矩阵的设计.进而,针对实际通信系统中反馈信道带宽的限制,给出了一种有限反馈中继预编码码本的设计方案.计算机仿真表明,本文所提新码本有限反馈中继预编码方案的系统性能随着反馈比特数的增加接近完全反馈下的系统性能,且在相同反馈比特数下的系统容量和误码率均明显优于将传统MIMO通信系统中的Grassmannian码本或随机码本直接应用于中继预编码的有限反馈方案.

In this paper,we first obtain the optimal relay preceding matrix for amplify-and-forward relay system under the requirement of quality-of-service（QoS）.Then,in view of the bandwidth limits of the feedback channel in practical communication system,we propose a novel design method of limited feedback relay precoding codebook.Computer simulations indicate that the proposed new limited feedback relay precoding scheme in this paper performs close to the optimal precoding scheme with unlimited feedback,and obtains larger system sum capacity gains and lower bit-error rate than that directly based on Grassmannian codebook or random codebook.