In this paper, the secrecy problem in the state dependent causal cognitive interference channel is studied. The channel state is non-causally known at the cognitive encoder. The message of the cognitive encoder must be kept secret from the primary receiver. We use a coding scheme which is a combination of compress-and-forward strategy with Marton coding, Gel’fand-Pinsker coding and Wyner’s wire...

In this work, we investigate a three-user cognitive communication network where a primary two-user multiple access channel suffers interference from a secondary point-to-point channel, sharing the same medium. While the point-to-point channel transmitter—transmitter 3—causes an interference at the primary multiple access channel receiver, we assume that the primary channel transmitters—transmit...

This paper studies the problem of interference channels with one cognitive transmitter (ICOCT) where “cognitive” is defined from both the noncausal and causal perspectives. For the noncausal ICOCT, referred to as interference channels with degraded message sets (IC-DMS), we propose a new achievable rate region that generalizes existing achievable rate regions for IC-DMS. In the absence of the n...

The cognitive radio channel with common message (CRCC) is considered. In this channel, similar to the cognitive radio channel (CRC), we have a cognitive user which has full non-causal knowledge of the primary message, and like the interference channel with common message (ICC), the information sources at the two transmitters are statistically dependent and the senders need to transmit not only ...

!"#$$%" &'()*(a b Contributions • new inner bound (largest region) • new outer bound (not tightest, but computable) • capacity for deterministic channels (also semi-deterministic) • 1.8 bit gap result for Gaussian channels (preliminary simulations show smaller gap) Tx 1 Tx 2 Rx 1 Rx 2 [2] A. Avestimehr, S. Diggavi, and D. Tse, " A deterministic model for wireless relay networks an its capacity,...

In this paper, we introduce the Causal Cognitive Interference Channel With Delay (CC-IFC-WD) in which the cognitive user transmission can depend on L future received symbols as well as the past ones. Taking the effect of the link delays into account, CC-IFC-WD fills the gap between the genieaided and causal cognitive radio channels. We study three special cases: 1) Classical CC-IFC (L = 0), 2) ...

In this paper the secrecy problem in the cognitive state-dependent interference channel is considered. In this scenario we have a primary and a cognitive transmitter-receiver pairs. The cognitive transmitter has the message of the primary sender as side information. In addition, the state of the channel is known at the cognitive encoder. Hence, the cognitive encoder uses this side information t...