Protograph-based LDPC code design for bit-metric decoding

Fabian Steiner, Georg Bocherer, Gianluigi Liva
2015 2015 IEEE International Symposium on Information Theory (ISIT)  
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 1 2 log 2 (1 + SNR) at a spectral efficiency of 4.25 bits/channel use and a frame error rate of 10 −3 .
doi:10.1109/isit.2015.7282623 dblp:conf/isit/SteinerBL15 fatcat:5siqtt6eyfgilk3yqibokkb2ui