Pilot Pollution Algorithm Based on Cell Sectorization Elimination in Massive MIMO System

Pilot contamination in massive MIMO systems is a major bottleneck system performance. generally, pilot-based methods are used to eliminate pilot contamination, while the overlong pilot sequence causes the waste of the spectrum resources. In order to solve this problem, we take the cell sectorization division into consideration, and propose a new pilot allocation for scheme cell sectorization of each cell. Specifically, we assigns orthogonal pilot to different users in the same cell sectorization, and reuse the same pilot between different cell sectorization so as to achieve the the purpose of shortening pilot length and improving spectral efficiency while using Bayesian estimation to eliminate pilot contamination. Simulation results show that this scheme is able to eliminate pilot contamination, and the performance is almost the same as the case of undivided cell sectorization. More importantly, the length of the pilot sequence can be significantly reduced, and the performance degradation caused by the division of the cell sectorization can be compensated by increasing the number of antennas.