UAV-Enabled Robust Covert Communication Against Active Wardens
Fangtao Yang, Chao Wang, Jun Xiong, Na Deng, Nan Zhao, Yonghui Li
Abstract
This correspondence investigates the robust unmanned aerial vehicle (UAV) enabled covert communication system with active ground wardens of collusive detection and location uncertainty. The three-dimensional (3D) trajectory and transmit power of UAV are jointly optimized to maximize the average covert transmission rate subject to the worst-case covertness constraint. The problem is intractable due to its nonconvexity and semi- positive definite matrix constraint, and an iterative suboptimal algorithm is proposed based on the block coordinate descent, S-procedure and successive convex optimization to tackle it. Numerical results demonstrate that the proposed scheme is effective and robust for UAV-enabled covert communications against active wardens.