Title :
Protograph-based LDPC code design for bit-metric decoding
Author :
Fabian Steiner;Georg Böcherer;Gianluigi Liva
Author_Institution :
Institute for Communications Engineering, Technische Universitä
fDate :
6/1/2015 12:00:00 AM
Abstract :
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 codes 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 over 2 log2(1 + SNR) at a spectral efficiency of 4.25 bits/channel use and a frame error rate of 10-3.
Keywords :
"Parity check codes","Decoding","Probabilistic logic","Signal to noise ratio","Modulation","Optimization","Bit error rate"
Conference_Titel :
Information Theory (ISIT), 2015 IEEE International Symposium on
Electronic_ISBN :
2157-8117
DOI :
10.1109/ISIT.2015.7282623