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Quantization for Soft-Output Demodulators in Bit-Interleaved Coded Modulation Systems (0905.0606v1)
Published 5 May 2009 in cs.IT and math.IT
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.