The Fixed Power Allocation Algorithm for Uplink Massive MIMO

Abstract

In massive multiple-input multiple-output(MIMO) systems, pilot contamination limits the improvement of system capacity seriously. This problem is usually solved by pilot allocation and precoding in recent years. However, the two methods have higher computational complexity, and they don ’ t consider pilot power allocation. So a fixed power allocation scheme is proposed in this paper, which can relieve pilot contamination of edge terminals effectively with low computational complexity. The process of this scheme was divided into two steps: first, re-deduced the expression of signal-to-interference-to-noise ratio (SINR) of terminals in massive MIMO cells. Second, the power allocation coefficient was calculated by solving the formula of equal-ratio series, and it was used for pilot power allocation. Finally, simulation results show that the proposed algorithm has a good effect on improving system capacity of edge terminals with low computational complexity.