Secrecy Analysis in UAV-aided CR-NOMA Networks with Artificial Noise

In this article, physical layer security is investigated in a non-orthogonal multiple access (NOMA) network with unmanned aerial vehicle (UAV) relay in the context of underlay cognitive radio (CR). The secondary transmitter transmits the mixed signal incorporated with NOMA to the two legitimate users via the aid of a UAV relay in the presence of an eavesdropper. To enhance the system secrecy performance, the joint of artificial noise (AN) and decode-and-forward (DF) technique is applied. Considering all the channels undergo Nakagami-m fading with path loss, along with the interference of the primary transmitter, we derive the secrecy outage probabilities (SOPs) of both legitimate users to evaluate. Simulation results are presented and analyzed to verify the accuracy of derived expressions as well as to show the effectiveness of the proposed scheme and some critical parameters.