Gamma Approximation Based Multi-Antenna Covert Communication Detection

Covert communication technology makes wireless communication more secure, but it also provides more opportunities for illegal users to transmit harmful information. In order to detect the illegal covert communication of the lawbreakers in real time for subsequent processing, this paper proposes a Gamma approximation-based detection method for multi-antenna covert communication systems. Specifically, the Gamma approximation property is used to calculate the miss detection rate and false alarm rate of the monitor firstly. Then the optimization problem to minimize the sum of the missed detection rate and the false alarm rate is proposed. The optimal detection threshold and the minimum error detection probability are solved according to the properties of the Lambert W function. Finally, simulation results are given to demonstrate the effectiveness of the proposed method.