Pilot Contamination Elimination in Massive MIMO Systems with an Improved Time-Shifted Scheme  

作　　者：Yuanyuan Hao Zhengyu Song 

机构地区：[1]Institute of Telecommunication Satellite,China Academy of Space Technology,Beijing 100094,China [2]School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China

出　　处：《Journal of Beijing Institute of Technology》2020年第1期16-22,共7页北京理工大学学报（英文版）

基　　金：Supported by Beijing Natural Science Foundation(4194087)。

摘　　要：Pilot contamination can bring up a grave impairment in the performance of massive multiple-input multiple-output(MIMO)systems.In this paper,an improved time-shifted pilot scheme is proposed to reduce the pilot contamination,where orthogonal pilots are employed in the same group to eliminate the residual intragroup interference existing in the original time-shifted pilot scheme.Meanwhile,the rigorous closed-form expressions of both downlink and uplink transmission rates with a finite number of antennas are derived,and it is shown that the intra-group interference can be completely eliminated by the proposed scheme.Simulation results demonstrate that both downlink and uplink transmission rates are significantly improved by employing the proposed scheme.

关 键 词：MASSIVE MULTIPLE-INPUT multiple-output(MIMO) PILOT contamination time-shifted PILOT 

分 类 号：TN929.52[电子电信—通信与信息系统]