摘要
针对时间相干信道下多输入多输出(multiple input multiple output,MIMO)波束赋形系统提出了一种基于邻域的有限反馈方法。该方法利用相邻帧波束赋形码字间的相关性,将前一帧波束赋形码字的邻域内码字组成当前帧的新码本,从而降低反馈比特数,并给出周期性反馈和自适应反馈两种方案。仿真结果表明所提方案相比普通反馈方法能有效降低反馈速率,周期性反馈能显著降低反馈量但有一定的性能损失,自适应反馈能适当降低反馈量且没有任何性能损失。
For MIMO beamforming systems over temporally-correlated channels,a novel limited feedback approach based on neighborhood is proposed.In the approach,exploiting the correlation of beamforming codewords corresponding to adjacent frames,the new codebook of current frame consists of the codewords within in the neighborhood of previous beamforming codeword,thereby the number of feedback bits can be reduced.Then both periodic feedback scheme and auto-adaptive feedback scheme are presented.The simulation results show that the presented schemes can reduce efficiently the feedback rate compared to common feedback approach.The periodic feedback can reduce remarkably feedback amount with some performance loss,while the auto-adaptive feedback can reduce moderately feedback amount without any performance loss.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2010年第7期1373-1376,共4页
Systems Engineering and Electronics
基金
国家重点基础研究发展规划(973计划)(2007CB307100)资助课题
关键词
波束赋形
有限反馈
时间相干
自适应反馈
beamforming
limited feedback
temporally correlation
auto-adaptive feedback
