On Gaussian Multiple Access Channels with Interference: Achievable Rates and Upper Bounds

TL;DR

This paper analyzes the capacity limits of two interfering Gaussian multiple access channels, deriving achievable rates, upper bounds, and sum capacity under various interference conditions.

Contribution

It provides new capacity characterizations and bounds for Gaussian MACs with interference, including less restrictive sum capacity results and nearly tight upper bounds.

Findings

Capacity region characterized under mixed strong and very strong interference.

Sum capacity derived under a less restrictive interference condition.

A general upper bound on sum capacity that is nearly tight for weak cross links.

Abstract

We study the interaction between two interfering Gaussian 2-user multiple access channels. The capacity region is characterized under mixed strong--extremely strong interference and individually very strong interference. Furthermore, the sum capacity is derived under a less restricting definition of very strong interference. Finally, a general upper bound on the sum capacity is provided, which is nearly tight for weak cross links.