结合波束成形MMSE-THP算法研究  

MMSE-THP combined with receive beamforming for multi-user MIMO downlinks

作　　者：祁美娟[1] 吴玉成[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《计算机应用研究》2012年第1期92-94,共3页Application Research of Computers

基　　金：中国博士后基金资助项目(20090450787);国家"211工程"创新人才培养计划资助项目(S-09102)

摘　　要：Tomlinson-Harashima预编码(THP)算法是一种多输入多输出下行链路系统中有效去除用户间干扰(MUI)的预均衡技术,但存在系统容量损失的问题。为此,提出通过在接收端进行波束成形使得MMSE-THP系统和容量最大化,设计了信道状态信息完美和不完美两种情况下结合波束成形的系统方案。理论分析与仿真结果均表明,与传统MMSE-THP算法相比较,该方案在低信噪比时能提高系统和容量,并对高信噪比时系统的误码性能有明显改善。For multiple input multiple output（MIMO） downlink systems,Tomlinson-Harashima precoding（THP） algorithm is a pre-equalization technique that is used to eliminate the multi-user interferences（MUI）.However,THP suffers several sum-capacity losses.This paper proposed a method of THP based minimum mean square error（MMSE） criterion（MMSE-THP） combined with receive beamforming to maximize the system sum-capacity.It designed the system scheme under perfect channel state information（CSI） and imperfect channel state information.Both theoretical analysis and simulation results show that the scheme has higher sum-capacity than the traditional MMSE-THP at lower SNR,and improves the bit error ratio performance obviously at higher SNR.

关 键 词：预编码 波束成形 和容量 信道状态信息 

分 类 号：TN911[电子电信—通信与信息系统] TP301.6[电子电信—信息与通信工程]