A New Sum-Rate Outer Bound for Interference Channels with Three Source-Destination Pairs

TL;DR

This paper introduces a new sum-rate outer bound for three-user interference channels, extending existing methods and outperforming previous bounds in specific Gaussian channel scenarios.

Contribution

It generalizes techniques for two-user channels to three-user interference channels, providing a tighter outer bound for certain Gaussian cases.

Findings

Outperforms existing bounds for some Gaussian channel parameters

Extends two-user techniques to three-user interference channels

Provides a new theoretical limit for sum-rate capacity

Abstract

This paper derives a novel sum-rate outer bound for the general memoryless interference channel with three users. The derivation is a generalization of the techniques developed by Kramer and by Etkin et al for the Gaussian two-user channel. For the three-user Gaussian channel the proposed sum-rate outer bound outperforms known bounds for certain channel parameters.