Protograph-Based LDPC Code Design for Shaped Bit-Metric Decoding
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 for the code design are used. The constructed codes for uniform inputs perform as good as the multi-edge type codes of Zhang and Kschischang (2013). For 8-ASK and 64-ASK with probabilistic shaping, codes of rates 2/3 and 5/6 with blocklength 64800 are designed, which operate within 0.63dB and 0.69dB of continuous AWGN capacity for a target frame error rate of 1e-3 at spectral efficiencies of 1.38 and 4.25 bits/channel use, respectively.
Cite
@article{arxiv.1504.03628,
title = {Protograph-Based LDPC Code Design for Shaped Bit-Metric Decoding},
author = {Fabian Steiner and Georg Böcherer and Gianluigi Liva},
journal= {arXiv preprint arXiv:1504.03628},
year = {2015}
}
Comments
9 pages, 10 figures. arXiv admin note: substantial text overlap with arXiv:1501.05595