Covert Communication in D2D Underlaying Cellular Network

Abstract

This paper investigates the fundamental issues of power control for achieving covert communication in the D2D underlaying cellular networks consisting of a cellular user, a base station, a D2D pair and an active warden who always sends noise to interferes the possible covert communication just in case and the D2D pair acts as a friendly jammer to add uncertainty on warden. We consider a power control scheme where a randomly and independently changing transmit power is employed at D2D receiver to send jamming signal to warden. We first develop theoretical frameworks to model the detection error probability (DEP) at warden, and achievable covert rate performance at cellular user. Then we explore the corresponding optimal power control of jamming signal maximizing the achievable covert rate. Finally, extensive numerical results are provided to illustrate the covert performances of the D2D underlaying cellular networks.