Optimal Location Design for UAV Covert Communications with a Full-Duplex Receiver

This paper focuses on a UAV covert communication system with a full-duplex receiver and investigates the location design of such system based on physical layer security technology. By employing the classical probability theory, we first conduct analysis on the optimal detection threshold and the minimum detection error probability of the warden Willie under a typical UAV covert communication model. With the consideration of the UAV mobility, we then derive closed-form expression to characterize the UAV's optimal location under the transmission outage constraint and the covertness constraint. Finally, we present extensive numerical results to illustrate our theoretical findings and to demonstrate the covert performance of the UAV system can be significantly improved by adopting our proposed optimal location design method.