Secrecy Outage Performance Analysis of Vehicular DF Relaying Network Under Underlay Cognitive Power Constraint and Physical-Layer Security

In this paper, the authors investigate secrecy outage performance of a vehicular cognitive relaying network consisting of a stationary primary user, a secondary mobile source, a secondary mobile destination, and a secondary mobile relay. To evaluate the performance, we derive the exact and approximate closed-form expressions for secrecy outage probability in two cases: one involving a stationary eavesdropper and one involving a mobile eavesdropper. We use a Monte Carlo simulation to verify our mathematical analysis. The results show that the secrecy outage performance is improved when the distances between the primary user, the eavesdropper, and the secondary source and relay are increased. Additionally, increasing the secrecy target rate of the system by increasing the interference levels of the primary network improves the system’s performance.