基于最大化信干噪比的多用户MIMO下行预编码  

Linear Precoding Based on Maximum SJNR in Multi-user MIMO Downlink

作　　者：唐万斌[1] 李少谦[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,四川成都610054

出　　处：《电子学报》2007年第B06期157-160,共4页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60496313);国家863计划项目(No.2003AA12331006);重庆邮电大学基金项目资助研究课题

摘　　要：研究多用户MIMO系统下行链路的容量,以及如何达到该容量是最近几年研究的热点.基于各用户之间干扰为零的BD(Block Diagonalization)算法,由于各用户信道空间的交叠,会造成多用户MIMO系统容量较大的损失,同时BD算法要求接入点的发射天线数不能小于空间复用用户的接收天线数之和.本文提出了基于最大化信干噪比准则下的线性预编码,和减少容量损失的次优线性预编码两种方案,避免了上述两个缺点,推导出基于最大化SJNR准则的线性预编码就是各用户采用单数据流传输的方案,同时通过容量分析和误码率仿真证明,这两种算法都优于传统的BD算法.What＇s the capacity of the multi-user MIMO downlink and how to get the capacity are the hot research topics in the latest years. The BD （Block Diagonalization ） algorithm, based on the constraint which the interferences between different users are zero,have two drawbacks. One is the capacity loss because the signal spaces of different users are overlapped,the other is that it is required that the number of the access point＇ s antennas must larger than the sum of the num of users＇ antennas. This paper presents two linear precoding algorithms. One is the optimal algorithm based on the maximization of SJNR, the other is a modified suboptimal algorithm which can improve the downlink capacity.By capacity analysis and simulation, the performances of the two algorithms both are better than BD algorithm.

关 键 词：多输入多输出天线 预编码 多用户 信干噪比 

分 类 号：TN92[电子电信—通信与信息系统]