关键词: 大规模多输入多输出系统, 导频污染, 最强用户冲突解决算法, 定时提前信息

Abstract:

To resolve the pilot contamination problem in massive multiple input multiple output(MIMO) systems, a pilot random access scheme called Strongest User Collision Resolution-Timing Advance(SUCR-TA), is proposed. This scheme takes the propagation delay into account, and selects an appropriate TA information for pilot to reduce the number of contenders who will perform the SUCR algorithm, and thus improves the probability of collision resolution. Simulation results demonstrate that, compared to the SUCR algorithm, the SUCR-TA scheme can significantly increase the number of the successful users of the system.

Key words: massive multiple input multiple output systems, pilot contamination, strongest-user collision resolution, timing advance