On the Capacity of Interference Channels with One Cooperating Transmitter

TL;DR

This paper investigates the capacity limits of interference channels where one transmitter has knowledge of both messages, introducing bounds that incorporate advanced coding strategies and are evaluated for Gaussian channels.

Contribution

It provides new inner and outer bounds on the capacity region for cognitive interference channels, extending prior work with generalized coding strategies.

Findings

Inner and outer bounds established for the capacity region.

Bounds evaluated and compared for Gaussian channels.

Simpler bounds derived for specific decoding scenarios.

Abstract

Inner and outer bounds are established on the capacity region of two-sender, two-receiver interference channels where one transmitter knows both messages. The transmitter with extra knowledge is referred to as being cognitive. The inner bound is based on strategies that generalize prior work, and include rate-splitting, Gel'fand-Pinsker coding and cooperative transmission. A general outer bound is based on the Nair-El Gamal outer bound for broadcast channels. A simpler bound is presented for the case in which one of the decoders can decode both messages. The bounds are evaluated and compared for Gaussian channels.