大规模MIMO系统的信道估计研究  

THE RESEARCH OF CHANNEL EVALUATION FOR MASSIVE MIMO SYSTEM

作　　者：冯文[1] 周斌[1,2] 郑敏[1] 俞凯[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050 [2]上海无线通信研究中心,上海201210

出　　处：《计算机应用与软件》2016年第12期89-92,共4页Computer Applications and Software

基　　金：中国科学院战略性先导科技专项(A类)(XDA06011100);上海市自然科学基金项目(13ZR1440700);2014年第二批军民融合项目

摘　　要：对于在实际Massive MIMO环境中信道状态信息(CSI)的获取,传统的做法是在TDD系统环境下基于上下行信道互易性来获取下行信道信息,但是随着小区数和用户数的增加,导频污染已经成为其发展的瓶颈;在FDD系统环境下,用户的反馈量和码本长度将随着基站天线数的增加而极大地增加。针对这种情况,提出在FDD模式下结合3D_MIMO的基站节点(e NB)天线的配置模型,将水平域和竖直域的信道信息用码本分别由用户(UE)反馈给基站,减少反馈信息量,并做到与现有码本的良好兼容。试验结果表明FDD环境结合3D_MIMO的模式,虽然吞吐量逊于TDD环境下的信道互易性,但是在系统稳定性以及小区边缘用户体验上的表现更加优异。Comparing with the evaluation methods of channel state information （CSI） for Massive MIMO in the actual environment, the traditional approach acquire downlink channel information based on its channel reciprocity in the TDD system environment. However, with the increase of cells and users, pilot pollution has become the bottleneck of its development. In FDD system environment, the users＇ feedback overhead and thedimension of codebook will increase with the number of base station antenna greatly. For this kind of situation, a configuration model combined with the base station antenna of 3D_MIMO is put forward in FDD system environment. Then the users can feedback the channel state information of horizontal and vertical domains respectively to the base station in order to reduce the feedback overhead and have a good compatible with the existing codebook. Experimental results show that the throughput of this model which combined FDD environment with 3D_MIMO is inferior to the channel reciprocity in TDD environment, but the stability of the system and the performance of the user experience on the edge of the cell is more outstanding.

关 键 词：大规模MIMO 3D_MIMO 双码本反馈 LTE 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]