Physical Layer Security of Untrusted UAV-enabled Relaying NOMA Network Using SWIPT and the Cooperative Jamming

Unmanned aerial vehicles (UAVs) have been widely used in wireless communication network for its high flexibility and broad coverage. However, due to the wireless broadcast and high power consumption features of UAV networks, physical layer secrecy (PLS), spectrum efficiency and energy supply are of major importance. In this paper, we propose a novel untrusted simultaneous wireless information and power transfer (SWIPT) UAV relaying network in which cooperative jamming is utilized to enhance secrecy performance. We take advantage of nonorthogonal multiple access (NOMA) technique to improve the spectrum efficiency. For energy supply, the UAV relay harvests energy from source and jammer node using power splitting (PS) scheme as well as amplifies and forwards (AF) the signal. The closed expressions of connection outage probability (COP) and secrecy outage probability (SOP) are derived over Nakagami-m fading channel. Simulation results demonstrate that the communication network security has been improved compared with orthogonal frequency division multiple access (OFDMA) network. Finally, minimum COP and SOP value can be achieved with appropriate parameters.