Improved exponents and rates for bit-interleaved coded modulation

Peng, Li; Fàbregas, Albert Guillén i; Martinez, Alfonso

doi:10.1109/isit.2013.6620574

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2014

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“…Another method to evaluate decoding metrics is the LM rate, see [8] and references therein. The LM rate is applied to BICM in [9]. [7,Sec.…”

Section: Introductionmentioning

confidence: 99%

Achievable Rates for Shaped Bit-Metric Decoding

Böcherer

2014

Preprint

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A new achievable rate for bit-metric decoding (BMD) is derived using random coding arguments. The rate expression can be evaluated for any input distribution, and in particular the bit-levels of binary input labels can be stochastically dependent. Probabilistic shaping with dependent bit-levels (shaped BMD), shaping of independent bit-levels (bit-shaped BMD) and uniformly distributed independent bit-levels (uniform BMD) are evaluated on the additive white Gaussian noise (AWGN) channel with Gray labeled bipolar amplitude shift keying (ASK). For 32-ASK at a rate of 3.8 bits/channel use, the gap to 32-ASK capacity is 0.008 dB for shaped BMD, 0.46 dB for bit-shaped BMD, and 1.42 dB for uniform BMD. These numerical results illustrate that dependence between the bit-levels is beneficial on the AWGN channel. The relation to the LM rate and the generalized mutual information (GMI) is discussed.

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“…Another method to evaluate decoding metrics is the LM rate, see [8] and references therein. The LM rate is applied to BICM in [9]. [7,Sec.…”

Section: Introductionmentioning

confidence: 99%