Transmit Power Minimization for Downlink Multi-Cell Multi-Carrier NOMA Networks

Abstract

In this letter, to minimize the total transmit power with constraints of the user data rate requirements, the radio resource allocation problem for multi-cell and multi-carrier non-orthogonal multiple access (MCMC-NOMA) network, which proves to be an NP-hard problem, is investigated. Therefore, to deal with this optimization problem, a centralized minimum power control algorithm with the fixed user assignment is developed first, upon which a greedy user clustering and power allocation scheme is proposed. The Monte Carlo simulation results demonstrate that the proposed resource allocation algorithm can dramatically reduce the total power consumption compared with ones in the existing literatures. Furthermore, NOMA really outperforms OMA networks in terms of transmit power consumption.