大规模MIMO网络中基于时间反演的预编码技术  

Pre-coding technology of massive MIMO system based on time-reversal

作　　者：李方伟[1,2] 孙晓健 张海波[1,2] LI Fangwei;SUN Xiaojian;ZHANG Haibo(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chiongqing 400065,P.R. China;Chongqing Key Laboratory of Mobile Communication Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学移动通信技术重庆市重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2019年第5期585-592,共8页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61771084)~~

摘　　要：针对大规模多输入多输出(multiple input multiple output,MIMO)网络中随基站天线数目与用户终端数目增多而引发的用户间干扰(inter user interference,IUI)问题,提出一种面向大规模MIMO的时间反演(time reversal,TR)预编码抗干扰技术。该方法在MIMO系统中先后历经信道探测、多径信道建模、干扰信道分析以及信道预编码矩阵设计,实现时间反演预编码信号在多径信道中IUI抑制传输,一方面在时间反演技术基础上进行信道优化,利用时间反演技术的时空聚焦性实现能量聚焦;另一方面利用迫零预编码技术降低大规模MIMO系统中用户间干扰与共道干扰。MATLAB仿真结果验证了基站天线数目、用户端终端数目对于大规模MIMO系统性能的影响,结果证明,时间反演预编码抗干扰技术可以使平均误比特率减小,并显著提高信干噪比和大规模MIMO系统的可达速率。Aiming at the problem of the Inter User Interference caused by the increasing number of base station antennas and user terminals in Massive MIMO systems, the Time Reversal Pre-Coding Anti-interference technology for massive MIMO system is proposed. The method performs channel sounding, multipath channel modeling, interference channel analysis and channel precoding matrix design in MIMO system to realize time reversed precoding signal IUI suppression transmission in multipath channel. On the one hand, the technology performs channel optimization based on TR technology, utilizes temporal and spatial focusing of Time Reversal technology to achieve energy focusing. Meanwhile, Zero Forcing is used to reduce the Inter User Interference and Co-Channel Interference in massive MIMO systems. The results of MATLAB simulation verify the impact of the number of base station antennas and the number of user terminals on the performance of massive MIMO systems. And the results verify that Time-Reversal Pre-Coding Anti-interference Technology can reduce the average Bit Error Rate, improve the signal and interference to noise ratio and achievable rate of MIMO system significantly.

关 键 词：大规模MIMO网络 预编码技术 时间反演 干扰抑制 

分 类 号：TN929.5[电子电信—通信与信息系统]