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On the generalized mutual information of BICM systems with approximate demodulation
KTH, School of Electrical Engineering (EES), Signal Processing.ORCID iD: 0000-0001-6630-243X
2010 (English)In: IEEE Information Theory Workshop 2010, Cairo, 2010, Vol. ITW 2010Conference paper (Refereed) [Artistic work]
Abstract [en]

We consider a generic bit-interleaved coded modulation (BICM) systems with an approximate demodulator or loglike-lihood ratio (LLR) computer. The performance of a BICM system with optimal demodulation has previously been characterized by Caire et al. in terms of the capacity of an independent parallel-channel model with binary inputs and (continuous) LLRs as outputs, and by Martinez et al. in terms of the generalized mutual information (GMI) where the BICM decoder is viewed as a mismatched decoder. Whereas GMI and capacity of the parallelchannel model coincide under optimal demodulation, they differ in general for the case of an approximate demodulator. Herein we show (i) that augmenting approximate BICM demodulators with scalar LLR correction increases the GMI and (ii) that the GMI of the LLR-corrected system coincides with the capacity of the parallel-channel model with binary inputs and outputs given by the approximate LLRs.

Place, publisher, year, edition, pages
Cairo, 2010. Vol. ITW 2010
Keyword [en]
Binary inputs, Bit interleaved coded modulation, Channel model, Generalized mutual information, Decoding, Demodulators, Information theory, Lunar surface analysis, Optical variables measurement, Optimization, Demodulation
National Category
Information Science
URN: urn:nbn:se:kth:diva-35648DOI: 10.1109/ITWKSPS.2010.5503201ScopusID: 2-s2.0-77954823579ISBN: 9781424463725OAI: diva2:429594
IEEE Information Theory Workshop 2010, ITW 2010; Cairo

QC 20110705

Available from: 2011-07-05 Created: 2011-07-04 Last updated: 2016-05-09Bibliographically approved

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Jaldén, Joakim
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