Simple transmission strategies for interference channel

TL;DR

This paper compares simple point-to-point coding strategies with the ETW scheme in symmetric interference channels, showing that simple codes perform comparably or better in practical power ranges for two and three users.

Contribution

It provides a comparative analysis of simple p2p codes versus the ETW scheme in symmetric interference channels, including closed-form characterizations for multiple users.

Findings

p2p coding performs as well or better than ETW in practical power ranges

closed-form rate characterizations for K-user symmetric ICs

similar performance trends observed for 2 and 3 user cases

Abstract

In this paper, we investigate performances of simple transmission strategies. We first consider two user SISO Gaussian symmetric interference channel (IC) for which Etkin, Tse and Wang proposed a scheme (ETW scheme) which achieves one bit gap to the capacity. We compare performance of point-to-point (p2p) codes with that of the ETW scheme in practical range of transmitter power. It turns out that p2p coding scheme performs better or as nearly good as the ETW scheme. Next, we consider K user SISO Gaussian symmetric IC. We define interference regimes for K user SISO Gaussian symmetric IC and provide closed-form characterization of the symmetric rate achieved by the p2p scheme and the ETW scheme. Using this characterization, we evaluate performances of simple strategies with K=3, and show the similar trend to two user case.