Unequal error protection in BICM with QAM constellations: interleaver and code design

Authors:
Alex Alvarado;Erik Agrell;Leszek Szczecinski;Arne Svensson
Affiliations:
Department of Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden and INRS-EMT, University of Quebec, Montreal, Canada;Department of Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden and INRS-EMT, University of Quebec, Montreal, Canada;Department of Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden and INRS-EMT, University of Quebec, Montreal, Canada;Department of Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden and INRS-EMT, University of Quebec, Montreal, Canada
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

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Abstract

In this paper we present a general methodology for the interleaver and code design for QAM-based BICM transmissions. We develop analytical bounds on the bit error rate and we use them to predict the performance of BICM when unequal error protection (UEP) is introduced by the constellation labeling. Based on these bounds, the optimum design of interleaver and code is presented. The improvements obtained reached 2 dB for the analyzed cases, and are obtained without complexity increase. Although previous works noted the influence of the interleaver design and the UEP, to the best of our knowledge, this paper is the first to analyze formally this problem for BICM transmissions.