摘要
在接收用户为多天线多输入多输出(MIMO)广播有限反馈系统中,信道方向矩阵的量化存在误差,此误差影响预编码设计,从而降低系统容量.针对此问题,通过分析信道方向向量量化误差的统计特性,提出了一种具有鲁棒性的基于最小均方误差(MMSE)的预编码方案.分析和仿真结果表明,所提的预编码方法有效提升了系统容量,降低了误码率(BER),减缓了平顶效应.
In multiple-in multiple-out(MIMO) broadcast systems with limited feedback,when receivers are equipped with multiple antennas,the so-called quantization error of channel direction matrix will be unavoidably introduced.This quantization error results in the reduction of system capacity since it is referenced in the Precoding design.A robust Precoding method based on minimum mean square error(MMSE) is proposed,which considers the statistical characteristics of the quantization error for channel direction matrix.Simulation shows that the proposed method effectively enhanced system capacity,reduced bit error rate(BER),as well as mitigated the plateau effect.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2012年第2期24-27,共4页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(60872149)
关键词
多输入多输出
最小均方误差
有限反馈
联合预编码
multiple input multiple output
minimum mean squared error
limited feedback
joint precoding