Practical Coding Schemes for Cognitive Overlay Radios

TL;DR

This paper presents practical coding schemes for cognitive overlay radios based on the cognitive interference channel model, achieving near-capacity performance with low error rates across known capacity regimes.

Contribution

It introduces implementable coding strategies inspired by information theory for cognitive radios, focusing on joint decoding in various capacity regimes.

Findings

Schemes perform close to capacity limits

Joint decoding improves error rates

Applicable across multiple parameter regimes

Abstract

We develop practical coding schemes for the cognitive overlay radios as modeled by the cognitive interference channel, a variation of the classical two user interference channel where one of the transmitters has knowledge of both messages. Inspired by information theoretical results, we develop a coding strategy for each of the three parameter regimes where capacity is known. A key feature of the capacity achieving schemes in these regimes is the joint decoding of both users' codewords, which we accomplish by performing a posteriori probability calculation over a combined trellis. The schemes are shown to perform close to the capacity limit with low error rate.