Power Allocation Based on Complex Shape Method in NOMA System

Abstract

Power allocation is critical to non-orthogonal multiple access (NOMA) system. Aiming at the problem that the traditional fixed power allocation (FPA) algorithm and the fractional transmit power allocation (FTPA) algorithm are difficult to achieve optimal power allocation, and based on the theoretical research of the existing complex shape method, this paper proposes power allocation scheme based on complex shape search (CSS) algorithm. The algorithm obtains the initial power value within the constraints, continuously updates the centroid, shrinks the complex shape and finally finds the optimal power value that meets the accuracy requirements to maximize the system throughput. The simulation results show that the performance of the scheme is significantly better than the traditional FPA and FTPA schemes, and it also shows that the performance of the non-orthogonal multiple access system is superior to the orthogonal multiple access (OMA) system.