Relaying in Non-Orthogonal Multiple Access Systems with Simultaneous Wireless Information and Power Transfer

Non-orthogonal multiple access (NOMA) technique in cooperative system with energy harvesting is investigated. A decode-and-forward (DF) relay is used to send messages from the base station (BS) to users. Following the time-switching technique, the relay uses a portion of transmission period to collect energy from BS then deliver information to users. System performances are explored in terms of signal-to-noise and outage probability. Simulation results validate the proposed theorem, and show the impact of the combination of these techniques to improve system self-sustainability.