Performance Bounds for Quantized Spatially Coupled LDPC Decoders Based on Absorbing Sets
2018 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY (ISIT)(2018)
摘要
Absorbing sets are known to be the primary factor in the error-floor performance of low-density parity-check (LDPC) codes with message passing decoders over the additive white Gaussian noise (AWGN) channel. Besides showing excellent waterfall performance, spatially coupled LDPC (SC-LDPC) codes that are constructed by an edge spreading technique are known to have fewer cycles and absorbing sets than their block code counterparts, and therefore to exhibit better error-floor performance. Based on our previously obtained results for quantized LDPC block decoders, we derive lower bounds on the performance of quantized SC-LDPC decoders, including both a flooding schedule decoder and a sliding window decoder. Numerical simulation results confirm the accuracy of the obtained bounds and show that, for quantized decoders, properly designed SC-LDPC codes have better error-floor performance than their underlying LDPC block codes.
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关键词
performance bounds,quantized spatially coupled LDPC decoders,error-floor performance,low-density parity-check codes,message passing decoders,additive white Gaussian noise channel,quantized LDPC block decoders,quantized SC-LDPC decoders,flooding schedule decoder,sliding window decoder,quantized decoders,SC-LDPC codes,underlying LDPC block codes
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