Iterative Decoding of BICM with Non-Regular Signal Constellation Sets

Authors:

Clevorn, T. ,  Vary, P.

Book Title:

Proceedings of International ITG Conference on Source and Channel Coding (SCC)

Address:

Erlangen, Germany

Date:

Jan. 2004

Language:

English

Abstract

Bit-interleaved coded modulation with iterative decoding (BICM-ID) is a transmission scheme with excellent performance on fading channels. A key design element, especially regarding the asymptotic performance of the BER, is the mapping of the bit patterns to the
elements of the signal constellation set. In this paper we present mappings and new non-regular signal constellation sets with superior asymptotic performance. These proposed mappings use signal constellation sets with less elements than the number of bit patterns to be transmitted and an appropriate assignment of the bit patterns to them. The puncturing introduced by the not one-to-one
relation between assigned bit patterns and the elements of the signal constellation set is compensated by the usage of extrinsic information obtained in the iterations. The convergence behavior is conrmed by EXIT charts. We further show the theoretical limits for the improvement of BICM-ID by this technique.

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