Energy-Efficient Resource Allocation for NOMA Systems

As an aspiring multiple access scheme for future radio access, Non-Orthogonal Multiple Access (NOMA) is considered as a promising technique for the fifth-generation mobile communication networks (5G). The goal looks to improve Spectral Efficiency (SE) and flexible allocation of radio resources for users. In addition to this, Green Radio (GR), which focuses on Energy Efficiency (EE), is becoming a sought-after trend in the process of a future for an energy-efficient system. In this paper, added to SE improvement, we seek to enhance EE for downland NOMA systems. The problem is formulated as a non-convex optimization subject in which the basic idea is to maximize the EE by imposing a minimum satisfying SE while guaranteeing a Quality of Service (QoS) for each user. Optimization problem's solution is achieved when an optimal power allocation is obtained. Simulation results confirm analytical results and show the proposed power allocation scheme's efficiency to reach a flexible resources allocation.