Covert Rate Study for Full-Duplex D2D Communications Underlaid Cellular Networks

Device-to-device (D2D) communications underlaid cellular networks have emerged as a promising network architecture to provide extended coverage and high data rate for various Internet of Things (IoT) applications. However, because the inherent openness broadcasting nature wireless communications, such face severe risks privacy disclosure. This paper investigates covert in providing enhanced protection. Specifically, this explores critical performance full-duplex D2D communication consisting base station, user, pair with transmitter receiver, warden, where receiver can operate over either (FD) mode or half-duplex (HD) mode. We first derive transmission outage probabilities links under FD HD modes, respectively. Based on these probabilities, we further theoretical modelling each explore corresponding maximization by jointly optimizing transmit powers user. To improve performance, propose general which flexibly switch between two modes. Under mode, also investigate problems rate. Finally, present extensive numerical results illustrate performances FD, HD,