Secrecy Outage Analysis for Wireless-Powered IoT Relaying NOMA Networks over Nakagami-$m$ Fading Channels

In this paper, we anaylze the secrecy performance for a wireless-powered Internet of Things (IoT) relaying-enabled non-orthogonal multiple access (NOMA) network. In the considered system, a source node transmits signal to a user through a power-constrained IoT relay, which puts forward its own data together with the decoded data under the NOMA technique to two users in the presence of an eavesdropper. In addition, the scenario that the relay can receive both the energy and information from the source through a time-switching mode is considered. Assuming all the channels are subject to Nakagami-$m$ fading, the closed-form expressions for the secrecy outage probability of the two users are obtained, which are also verified by Monte-Carlo simulations.