Movable Antennas Enabling Covert Communication with Full-Duplex Receiver

In this paper, we construct a framework for covert communication assisted by a full-duplex (FD) receiver with movable antennas (MAs). Specifically, we consider uniformly distributed artificial noise (AN) to confuse the warden and give the closed-form expressions for the communication covertness and the transmission outage probability. In the considered system, we formulate a problem to maximize the covert throughput by optimizing the antenna positions and the transmit power of AN. To cope with the high coupling of the proposed problem, we derive the minimal area region based on the characteristics of the movable antennas’ channel gain, thereby reducing the range of exhaustive search. Numerical results show that MAs can significantly improve covert throughput in comparison with the fixed-position antennas (FPAs). In addition, there exists an optimal distance for the transmit and receive antennas of the FD receiver, which can maximize the covert transmission throughput.