Lyapunov optimization for NOMA wireless transmission with energy harvesting and storage

Abstract

In this letter, we study optimal power allocation for a Non-Orthogonal Multiple Access (NOMA) communication system, where the transmitter transmits superimposed information symbols to two users over fading channel with energy harvesting technology. Our objective is to maximize the long-term time-averaged transmission rate subject to the power constraint of the transmitter. By exploiting Lyapunov optimization scheme, we equivalently transform the non-convex optimization problem into a single time slot optimal problem and solve it by alternative optimization scheme with the help of convex optimization. At the end, simulation results have shown that the proposed optimal scheme outperforms other two compared algorithms and can achieve Lyapunov stability.