基于PU^2RC的下行多用户MIMO系统多模发送方案  

PU^2RC Based Multi-Mode Transmission for Multi-User MIMO Downlink Systems

作　　者：张才华[1] 许道峰[1] 许威[2] 

机构地区：[1]中国电子科技集团公司第二十八研究所,南京210007 [2]东南大学移动通信国家重点实验室,南京210096

出　　处：《数据采集与处理》2013年第1期1-6,共6页Journal of Data Acquisition and Processing

基　　金：国家重点基础研究发展计划("九七三"计划)(2007CB310603)资助项目;东南大学移动通信国家重点实验室自主研究基金(2011B01)资助项目

摘　　要：针对有限反馈下行多用户多输入多输出(Multiple-input multiple-output,MIMO)系统,提出了一种基于每用户正交码率控制(Per user unitary rate control,PU2 RC)的多模发送方法。该方法通过最大化系统的遍历和速率来自适应地选取发送模式,即系统同时传输的并行数据流数目。由于直接计算系统的遍历和速率比较困难,本文推导出它的一个上界,并以最大化该上界来简化发送模式的选取。仿真结果表明,所提方案的遍历和速率性能优于传统PU2 RC方案,特别当系统中用户数不大或者信噪比较高时,性能有明显的改善。Based on per user unitary and rate control （PU^2RC）, a multi-mode transmission scheme is presented for the multi-user multiple-input multiple-output （MIMO） downlink sys- tems with limited feedback. In the proposed scheme, the transmission mode, i. e. , the number of data streams for simultaneous transmission, is adaptively chosen to maximize the ergodic sum rate of the system. Due to the difficulty in evaluating the ergodic sum rate, an upper bound of the ergodic sum rate is derived and used as the metric for transmission mode selection. Simulation results show that the proposed scheme achieves better ergodic sum rate performance than the conventional PU^2RC scheme, especially when the number of users in the system is not so large or the signal-to-noise ratio is high.

关 键 词：多输入多输出 多用户 有限反馈 每用户正交码率控制 多模发送 

分 类 号：TN929.5[电子电信—通信与信息系统]