Practical Coding Schemes for Cognitive Overlay Radios

Details Practical Coding Schemes for Cognitive Overlay Radios Practical Coding Schemes for Cognitive Overlay Radios

2012-03-21

arxiv.org/abs/1203.4844v1

Computer Science

Information Theory

Scientific paper

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.

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