On the Capacity Region of the Cognitive Interference Channel with Unidirectional Destination Cooperation

TL;DR

This paper characterizes the capacity region of the cognitive interference channel with unidirectional destination cooperation, proposing a new achievable rate region that encompasses several known channel models and establishing tight bounds for certain classes.

Contribution

It introduces a new achievable rate region for the CIFC-UDC, improving previous results and unifying multiple channel models, along with a tight outer bound for specific cases.

Findings

Proposed a new achievable rate region for CIFC-UDC.

Included the largest known rate regions of related channels.

Established the capacity region for certain CIFC-UDC classes.

Abstract

The cognitive interference channel with unidirectional destination cooperation (CIFC-UDC) is a variant of the cognitive interference channel (CIFC) where the cognitive (secondary) destination not only decodes the information sent from its sending dual but also helps enhance the communication of the primary user. This channel is an extension of the original CIFC to achieve a win-win solution under the coexistence condition. The CIFC-UDC comprises a broadcast channel (BC), a relay channel (RC), as well as a partially cooperative relay broadcast channel (PCRBC), and can be degraded to any one of them. In this paper, we propose a new achievable rate region for the dis-crete memoryless CIFC-UDC which improves the previous re-sults and includes the largest known rate regions of the BC, the RC, the PCRBC and the CIFC. A new outer bound is presented and proved to be tight for two classes of the CIFC-UDCs, result-ing in the characterization of the capacity region.