In this letter, we consider delay-constrained covert communications with the aid of a full-
duplex (FD) receiver. Without delay constraints, it has been shown that the transmit power of …

This work tackles the joint optimization of the modulation order and transmit power of pulse-
position modulation (PPM) in covert communications. Specifically, we consider two …

In this work, a covert communication scheme under block-fading channels is proposed
where the relay, apart from forwarding source's information to the destination, also acts as a …

In a majority of research on covert communications, knowledge about channel state
information (CSI) of main channel and/or warden channel is assumed to be known or …

We consider that a transmitter covertly communicates with multiple receivers under the help
of a friendly jammer. The messages intended for different receivers are transmitted in …

In this paper, we study a legitimate proactive eavesdropping scenario where a central
monitor covertly wiretaps the communications between a pair of suspicious users via …

In this paper, we address the problem of covert communication under the presence of
multiple wardens with a finite blocklength. The system consists of Alice, who aims to covertly …

In this paper, we investigate the optimal probabilistic constellation shaping design for covert
communication systems from a practical view. Different from conventional covert …

We present a probabilistic framework for physical layer secrecy when the locations and
channels of the eavesdroppers are unknown. The locations are modeled by a Poisson point …

In this paper, we consider a novel covert communication scenario where the warden does
not have prior knowledge of the transmitter's power. In this scenario, the current widely …