Covert communications studied in prior works typically consider only the average power
constraint on the transmit signal. In this paper, we explore the optimal signaling for covert …

Covert communication provides the security for wireless communications via hiding the
existence of the transmissions. In this paper, we consider a scenario that the transmitter and …

We consider covert communication, ie, hiding the presence of communication from an
adversary for multiple-input multiple-output (MIMO) additive white Gaussian noise (AWGN) …

We consider the problem of covert communication over a state-dependent channel, where
the transmitter has causal or noncausal knowledge of the channel states. Here, covert …

Secrecy on the physical layer is a promising technique to simplify the overall cross-layer
secrecy concept. In many recent works on the multiple antenna wiretap channel, perfect …

In this paper, we address the problem of joint covert communication and secure
transmission in untrusted relaying networks when multiple wardens exist in the network. We …

In this paper, we suggest a physical layer security transmission scheme which can be
employed when an eavesdropper is located near a receiver and channels are correlated …

Covert communications enable a transmitter to send information reliably in the presence of
an adversary, who looks to detect whether the transmission took place or not. We consider …

This paper considers beamforming techniques for covert communication over multiple input
single output (MISO) channels with finite blocklength. We first show that the optimal input …

We consider the problem of covert communication over a state-dependent channel, for
which the transmitter and the legitimate receiver have non-causal access to the channel …