UAV-Enabled Cooperative Jamming for Covert Communications

In this paper a novel unmanned aerial vehicle aided (UAV) cooperative jamming scheme is proposed for covert communications. We first analyze the detection performance of the system to obtain the minimum error detection probability of the eavesdropper and then determine the transmission rate as the objective function by analyzing the transmission outage probability of the communication. The problem formulate is non-convex that is difficult to solve. To solve this, two efficient algorithms are proposed for general signal to interference plus noise ratio (SINR) and high SINR, respectively. The first algorithm applying the block coordinate descent (BCD) to decompose the problem into two subproblems and then solve them by successive convex approximation (SCA). For the second algorithm, we use a geometric method(GM) based on the Apollonius of Sphere to solve the optimization problem. The proposed scheme can enhance the covert performance significantly. Simulations verify that the proposed joint design can enhance the covert transmission rate of the considered system as compared to the benchmark schemes.