Quantization for Soft-Output Demodulators in Bit-Interleaved Coded Modulation Systems

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...

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Bibliographic Details
Published inarXiv.org
Main Authors Novak, Clemens, Fertl, Peter, Matz, Gerald
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 05.05.2009
Subjects
Bit error rate
Codes
Computer simulation
Counters
Demodulators
Measurement
Modulation
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Summary: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.
ISSN:2331-8422