Quantization for soft-output demodulators in bit-interleaved coded modulation systems

Authors:
Clemens Novak;Peter Fertl;Gerald Matz
Affiliations:
Institut für Nachrichtentechnik und Hochfrequenztechnik, Vienna University of Technology;Institut für Nachrichtentechnik und Hochfrequenztechnik, Vienna University of Technology;Institut für Nachrichtentechnik und Hochfrequenztechnik, Vienna University of Technology
Venue:
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 2
Year:
2009

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Abstract

We study quantization of log-likelihood ratios (LLR) in bit-interleaved coded modulation (BICM) systems in terms of an equivalent discrete channel. We propose to design the quantizer such that the quantizer outputs become equiprobable. We investigate semi-analytically and numerically the ergodic and outage capacity over single- and multiple-antenna channels for different quantizers. Finally, we show bit error rate simulations for BICM systems with LLR quantization using a rate 1/2 low-density parity-check code.