Capacity Theorems for the Fading Interference Channel with a Relay and Feedback Links

TL;DR

This paper derives exact capacity regions for fading interference channels with a relay and feedback, demonstrating the benefits of cooperation strategies in managing interference in wireless networks.

Contribution

It provides the first complete capacity characterizations for such channels under various feedback configurations in strong interference regimes.

Findings

Capacity regions are exactly characterized for multiple feedback scenarios.

Relaying and feedback significantly improve interference management.

Results highlight the importance of cooperation in wireless network design.

Abstract

Handling interference is one of the main challenges in the design of wireless networks. One of the key approaches to interference management is node cooperation, which can be classified into two main types: relaying and feedback. In this work we consider simultaneous application of both cooperation types in the presence of interference. We obtain exact characterization of the capacity regions for Rayleigh fading and phase fading interference channels with a relay and with feedback links, in the strong and very strong interference regimes. Four feedback configurations are considered: (1) feedback from both receivers to the relay, (2) feedback from each receiver to the relay and to one of the transmitters (either corresponding or opposite), (3) feedback from one of the receivers to the relay, (4) feedback from one of the receivers to the relay and to one of the transmitters. Our results show that there is a strong motivation for incorporating relaying and feedback into wireless networks.