This paper extends Information Theoretic analysis to packet random access systems with bursty traffic. A new channel coding approach for coding within each data packet is proposed with built-in support for bursty traffic phenomena, such as message underflow, and for random access mechanism, such as packet collision detection. The coding approach does not require joint communication rate determi...

abstract—in this paper, the problem of secure transmission in two-hop amplify-and-forward (af) systems with an untrusted relay is investigated. to prevent the untrusted relay from intercepting the source message and to achieve positive secrecy rate, the destination-based cooperative jamming (dbcj) technique is used. in this method the destination sends an intended jamming signal to the relay. t...

In this paper, the fundamental limits of simultaneous information and energy transmission in the two-user Gaussian interference channel (G-IC) without feedback are fully characterized. More specifically, an achievable and converse region in terms of information and energy transmission rates (in bits per channel use and energy-units per channel use, respectively) are presented. The achievable re...

In this paper, given the beamforming vector of confidential messages and artificial noise (AN) projection matrix and total power constraint, a power allocation (PA) strategy of maximizing secrecy rate (Max-SR) is proposed for secure directional modulation (DM) networks. By the method of Lagrange multiplier, the analytic expression of the proposed PA strategy is derived. To confirm the benefit f...

In this paper, the model of wiretap channel has been reconsidered for the case that the main channel is controlled by channel state information (side information), and it is available at the transmitter in a noncausal manner (termed here noncausal side information) or causal manner (termed here causal side information). Inner and outer bounds are derived on the capacity-equivocation regions for...

In this work, we study the stability region of the two-user broadcast channel (BC) with bursty data arrivals and security constraints. We consider the scenario, where one of the receivers has a secrecy constraint and its packets need to be kept secret from the other receiver. This is achieved by employing fullduplexing at the receiver with the secrecy constraint, so that it transmits a jamming ...

In this paper, we study the design of secure communication for time division duplexing multi-cell multi-user massive multiple-input multiple-output (MIMO) systems with active eavesdropping. We assume that the eavesdropper actively attacks the uplink pilot transmission and the uplink data transmission before eavesdropping the downlink data transmission phase of the desired users. We exploit both...

The capacity region of the interference channel inwhich one transmitter non-causally knows the message of theother, termed the cognitive interference channel, has remainedopen since its inception in 2005. A number of subtly differingachievable rate regions and outer bounds have been derived,some of which are tight under specific conditions. In thiswork we present a new u...