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

Clemens Novak, Peter Fertl, Gerald Matz
2009 2009 IEEE International Symposium on Information Theory  
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 lowdensity
more » ... 1/2 lowdensity parity-check code.
doi:10.1109/isit.2009.5206049 dblp:conf/isit/NovakFM09 fatcat:xt4hojjssjacdknsxvmvc42kvu