Protograph-Based LDPC Code Design for Bit-Metric Decoding [article]

Fabian Steiner and Georg Böcherer and Gianluigi Liva
2015 arXiv   pre-print
A protograph-based low-density parity-check (LDPC) code design technique for bandwidth-efficient coded modulation is presented. The approach jointly optimizes the LDPC code node degrees and the mapping of the coded bits to the bit-interleaved coded modulation (BICM) bit-channels. For BICM with uniform input and for BICM with probabilistic shaping, binary-input symmetric-output surrogate channels are constructed and used for code design. The constructed codes perform as good as multi-edge type
more » ... des of Zhang and Kschischang (2013). For 64-ASK with probabilistic shaping, a blocklength 64800 code is constructed that operates within 0.69 dB of 0.5log(1+SNR) at a spectral efficiency of 4.2 bits/channel use and a frame error rate of 1e-3.
arXiv:1501.05595v1 fatcat:3gzfmc7otfci5pa4pxkbm57raq