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

Abstract

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

A Comprehensive Survey on Full-Duplex Communication: Current Solutions, Future Trends, and Open Issues

“…In [301], the covert rate of device-to-device communication underlaid cellular networks consisting of a BS, a cellular user, a device-to-device pair with an FD receiver, and a warden is studied. By assuming that the device-to-device receiver can operate over either the FD or HD mode, this work investigates the covert rate maximization problem to jointly optimize the transmit powers of the device-to-device pair and the cellular user as well as receiver mode assignment.…”

“…Optimizing transmission rate and jamming power to maximize the connection throughput [300] Point-to-point, FD receiver over mmWave e Hybrid precoder and analog jamming design problem for the maximization of the achievable covert rate [301] Device-to-device pair with an FD receiver underlaid cellular network…”

Disguised Full-Duplex Covert Communications

“…Moreover, in a cognitive radio system, covert communications between secondary users in the presence of FD eavesdroppers that interfere with the secondary receiver with AN were examined by [ 31 ]. The work in [ 32 ] studied covert rate maximization with a half-duplex (HD)/FD mode switching device-to-device (D2D) covert receiver in the presence of an uplink spectrum-sharing cellular network. Both secrecy and covert rates were optimized when an untrusted FD AF relay delivers the covert message to an FD base station that emits AN to the warden in [ 33 ].…”