Capacity Bounds of Half-Duplex Gaussian Cooperative Interference Channel

TL;DR

This paper analyzes the capacity bounds of a half-duplex Gaussian interference channel with cooperative communication, demonstrating significant capacity improvements and optimality under strong cooperation links.

Contribution

It introduces new achievable regions and outer bounds for transmitter and receiver cooperation, highlighting the superiority of transmitter cooperation in certain scenarios.

Findings

Transmitter cooperation outperforms receiver cooperation in achievable region.

Capacity improves significantly with stronger cooperation links.

Achieves outer bounds when cooperation channel gain is infinite.

Abstract

In this paper, we investigate the half-duplex cooperative communication scheme of a two user Gaussian interference channel. We develop achievable region and outer bound for the case when the system allow either transmitter or receiver cooperation. We show that by using our transmitter cooperation scheme, there is significant capacity improvement compare to the previous results, especially when the cooperation link is strong. Further, if the cooperation channel gain is infinity, both our transmitter and receiver cooperation rates achieve their respective outer bound. It is also shown that transmitter cooperation provides larger achievable region than receiver cooperation under the same channel and power conditions.