Power Allocation for Energy-Efficient Downlink NOMA Systems

As a potential multiple access scheme for Nonorthogonal Multiple radio Access (NOMA) is considered a promising technique for the fifth-generation mobile networks (5G). This technology will improve both Spectral Efficiency (SE) and flexibility of radio resource allocation for users as it will be shown. Green Radio (GR), which concentrates on Energy Efficiency (EE), is becoming a sought-after trend in the process of a future for an energy-efficient system. In this paper, we seek to optimize the power allocation problem in order to improve EE for downlink NOMA systems. For this, a low complexity power allocation approach for each user has been proposed. Optimization problem's solution is achieved when optimal power values are obtained. The simulation results obtained show the effectiveness of our proposed allocation strategy. NOMA actually offers better improvements in EE compared than conventional non-orthogonal access.