摘要
针对大规模MIMO系统中的导频污染问题,提出了一种基于用户位置信息的导频分配方案。所提方案根据用户位置在以所在小区基站为极点的极坐标系下的极角大小,对用户进行排序并依次分配导频。方案结合了定向天线的特点,通过把导频的复用距离控制在较远的范围内,从而达到降低导频污染、提高系统可达和速率的目的。仿真结果表明,所提方案不仅能够有效降低用户间的导频污染,还能缩小不同用户间的性能差距,提高系统的公平性。
In order to solve the problem of pilot contamination in massive MIMO systems, a pilot allocation scheme based on user location information was proposed. The proposed scheme arranged the users according to the polar angle of the user location in the polar coordinate system with the base station of the cell as the pole, and assigned the pilots se-quentially. Combining with the characteristics of directional antenna, the scheme can reduce the pilot contamination and improve the achievable rate of the system by controlling the multiplexing distance of the pilot to a far range. Simulation results show that the proposed scheme can not only reduce the pilot pollution between users, but also reduce the perfor-mance gap between different users and improve the fairness of the system.
出处
《通信学报》
EI
CSCD
北大核心
2017年第8期156-164,共9页
Journal on Communications
基金
国家自然科学基金资助项目(No.61370012
No.61571082)
国家科技重大专项基金资助项目(No.20162X03001015-004)~~
关键词
大规模MIMO
导频污染
导频分配
定向天线
massive MIMO, pilot contamination, pilot allocation, directional antenna
