In this paper we consider the State-Dependent Wiretap Channel (SD-WC). As the main idea, we model the SD-WC as a Cognitive Interference Channel (CIC), in which the primary receiver acts as an eavesdropper for the cognitive transmitter’s message. By this point of view, the Channel State Information (CSI) in SD-WC plays the role of the primary user’s message in CIC which can be decoded at the eav...

In this paper, some new results on the multiple-access wiretap channel (MAC-WT) are provided. Specifically, first, we investigate the degraded MAC-WT, where two users transmit their corresponding confidential messages (no common message) to a legitimate receiver via a multiple-access channel (MAC), while a wiretapper wishes to obtain the messages via a physically degraded wiretap channel. The s...

This paper considers the compound wiretap channel, which generalizes Wyner’s wiretap model to allow the channels to the (legitimate) receiver and to the eavesdropper to take a number of possible states. No matter which states occur, the transmitter guarantees that the receiver decodes its message and that the eavesdropper is kept in full ignorance about the message. The compound wiretap channel...

The effect of signal dependent jitter noise on channel capacity is investigated. Upper and lower bounds on capacity are computed numerically for channels with a mix of signal dependent jitter noise and additive white Gaussian noise. The resulting bounds allow for comparison of potential coding gain for differing amounts of jitter noise and varying code rates. The comparison provides insight int...

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” means that a warden on the channel should observe similar statistics when the transmitter is sending a message and when it is not. When a sufficiently long secret key is shared between the transmitter and the receiver, we d...

We explore the capacity and generalized degrees of freedom of the two-user Gaussian X channel, i.e. a generalization of the 2 user interference channel where there is an independent message from each transmitter to each receiver. There are three main results in this paper. First, we characterize the sum capacity of the deterministic X channel model under a symmetric setting. Second, we characte...

We determine the information capacity of the linear, time-varying communications channel with additive white Gaussian noise for transmission signals with support approximately restricted to closed regions of the time and frequency domains. We address the two-part problem of first, constructing appropriate transmission functions, and second, determining the mutual information. Our approach provi...

This work concerns the behavior of “good” (capacity achieving) codes in several multi-user settings in the Gaussian regime, in terms of their minimum mean-square error (MMSE) behavior. The settings investigated in this context include the Gaussian wiretap channel, the Gaussian broadcast channel (BC) and the Gaussian BC with confidential messages (BCC). In particular this work addresses the effe...

Abstract: This letter presents a procedure of the capacity calculation for a multi-relay communication system for the assumed presence of additive white Gaussian noise and the flat fading in the channel. The exact formula for channel capacity as a function of channel parameters and the number of relays is derived. It was confirmed that the capacity of the network can be maintained and energy co...

A practical communication channel often suffers from constraints on input other than the average power, such as the peak power constraint. In order to compare achievable rates with different constellations as well as the channel capacity under such constraints, it is crucial to take these constraints into consideration properly. In this paper, we propose a direct approach to compare the achieva...