Outage Analysis of Downlink NOMA Full-Duplex Relay Networks with RF Energy Harvesting over Nakagami-m Fading Channel

In this paper, we propose and analyze a downlink non-orthogonal multiple access (NOMA) relay system with full-duplex transition model and decode and-forward (DF) scheme. We assume that the source and the destinations node have fixed power, whereas relay nodes have constrained energies and should harvest radio frequency (RF) energy from the source for operation power. The full duplex is assumed and the outage performance of this system is analyzed over the Nakagami-m fading channel with imperfect channel state information (CSI). The closed-form of outage probabilities are derived and evaluated in several scenarios. Moreover, the optimal power allocation coefficients which lead to the minimal outage probability while keeping the fairness in outage performance of end users are discussed. The analytical results are verified by the Monte-Carlo simulation.