Computer Science – Information Theory
Scientific paper
2008-05-19
Computer Science
Information Theory
5 pages, Proceedings of the 2008 IEEE International Symposium on Information Theory, Toronto, ON, Canada, July 6-11, 2008
Scientific paper
A coded modulation system is considered in which nonbinary coded symbols are mapped directly to nonbinary modulation signals. It is proved that if the modulator-channel combination satisfies a particular symmetry condition, the codeword error rate performance is independent of the transmitted codeword. It is shown that this result holds for both linear-programming decoders and sum-product decoders. In particular, this provides a natural modulation mapping for nonbinary codes mapped to PSK constellations for transmission over memoryless channels such as AWGN channels or flat fading channels with AWGN.
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