大规模多输入多输出系统中的导频污染降低策略

Pilot Contamination Reduction Scheme in Massive Multiple-input Multiple-output System

在大规模多输入多输出(massive multiple-input multiple-output,Massive MIMO)系统中,小区边缘用户遭受严重的导频污染,由此提出一种新的导频污染降低策略。根据大尺度衰落系数将小区内用户划分为中心用户和边缘用户,中心用户复用相同的一组导频序列,边缘用户使用相互正交的导频序列组。理论分析和仿真结果均表明,该策略能够有效地提升每个小区多用户的上行可达和速率,降低系统中的导频污染。

The users at cell edge of a massive multiple-input multiple-output （MIMO） system suffer from severe pilot contamination, a new pilot contamination reduction scheme is proposed.Specifically, the users are divided into two groups according to their large-scale fading coefficients, the cell center users use the same pilot sequence group and the cell edge users use mutually orthogonal pilot sequence group.The theoretical analysis and simulation results demonstrate that this method can effectively improve the sum uplink achievable rate of multi-user in per cell and reduce the pilot contamination in massive MIMO system.