改进PU2RC算法的多用户MIMO预编码研究  

Study on Multi-User MIMO Precoding with Improved PU2RC Algorithm

作　　者：张玉[1] 宋常建[1,2] 钟子发[1,2] 

机构地区：[1]电子工程学院,合肥230037 [2]安徽省电子制约技术重点实验室,合肥230037

出　　处：《电光与控制》2014年第2期90-93,共4页Electronics Optics & Control

摘　　要：在LTE下行链路的多用户MIMO系统中,基于传统PU2RC算法的预编码方案,由于受正交性约束而使多用户分集增益及系统"和容量"受到限制,对此,提出一种基于改进PU2RC算法的多用户MIMO预编码方案。它通过在基站端增加近距码字集,并对用户集为空集的码字实施二次调度处理,来提高多用户分集增益及系统"和容量"。仿真结果表明,与基于传统PU2RC算法的多用户MIMO预编码系统相比,该方案可以在保持反馈量不变的前提下显著提高系统吞吐量。In the LTE downlink multi-user MIMO system,the precoding scheme based on conventional per-user unitary beamforming and rate control （ PU2RC） algorithm suffers orthogonal restriction,thus the multi-user diversity gain and system sum rate are limited .Therefore,a new multi-user MIMO precoding scheme was proposed based on an improved PU2RC algorithm.A near-distance codewords set was added at the base station,then the codewords of the empty set to increase effectively the multi-user diversity gain and sum rate.Simulation results show that：compared with the multi-user MIMO precoding system based on the conventional PU2RC algorithm,the scheme can improve the sum rate performance notably while keeping the same amount of feedback .

关 键 词：多用户多输入多输出 预编码 反馈 多用户分集 和容量 

分 类 号：V271.4[航空宇航科学与技术—飞行器设计] TN929.5[电子电信—通信与信息系统]