Trajectory Optimization for UAV-Enabled Covert Communications

This paper studies covert communications in an unmanned aerial vehicle (UAV)-enabled network with time-varying channel. We explore the throughput maximization with covert requirement constraint. Toward this end, we first formulate the throughput maximization as an optimization problem with the constraints of covertness requirements. We then derive the average minimum detection error rate at warden, and further propose the trajectory optimization problem for the UAV. Next, we solve the optimization problem using successive convex approximation method. Numerical results are provided to validate our theoretical analysis and also to illustrate the impact of system parameters on the total throughput.