Novel Techniques to Derive Capacity Results for Multi-User Interference Channels

TL;DR

This paper introduces new techniques using Csiszar-Korner identity to establish single-letter outer bounds, enabling the full sum-rate capacity characterization of multi-user interference channels in wireless networks.

Contribution

It develops novel sequential methods to derive capacity outer bounds, advancing understanding of multi-user interference channels beyond two users.

Findings

Full sum-rate capacity characterization for certain multi-user ICs

Outer bounds applicable to both discrete and Gaussian networks

Enhanced capacity analysis techniques for interference networks

Abstract

The Interference Channels (ICs) represent fundamental building blocks of wireless communication networks. Despite considerable progress in network information theory, available capacity results for ICs, specifically those with more than two users, are still very limited. One of the main difficulties in the analysis of these networks is how to establish useful capacity outer bounds for them. In this paper, novel techniques requiring subtle sequential application of Csiszar-Korner identity are developed to establish efficient single-letter outer bounds on the sum-rate capacity of interference networks. By using the outer bounds, a full characterization of the sum-rate capacity is then derived for various multi-user ICs under specific conditions. Our capacity results hold for both discrete and Gaussian networks.