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Abstract: We consider spatially coupled code ensembles. A particular instance areconvolutional LDPC ensembles. It was recently shown that, for transmission overthe binary erasure channel, this coupling increases the belief propagationthreshold of the ensemble to the maximum a-priori threshold of the underlyingcomponent ensemble. We report on empirical evidence which suggest that the samephenomenon also occurs when transmission takes place over a general binarymemoryless symmetric channel. This is confirmed both by simulations as well asby computing EBP GEXIT curves and by comparing the empirical BP thresholds ofcoupled ensembles to the empirically determined MAP thresholds of theunderlying regular ensembles. We further consider ways of reducing therate-loss incurred by such constructions.



Autor: Shrinivas Kudekar, Cyril Measson, Tom Richardson, Ruediger Urbanke

Fuente: https://arxiv.org/







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