Protograph-Based LDPC Code Design for Ternary Message Passing Decoding
Konferenz: SCC 2019 - 12th International ITG Conference on Systems, Communications and Coding
11.02.2019 - 14.02.2019 in Rostock, Germany
doi:10.30420/454862004
Tagungsband: SCC 2019
Seiten: 6Sprache: EnglischTyp: PDF
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Autoren:
Yacoub, Emna Ben (Institute of Communications and Navigation, German Aerospace Center (DLR), Germany & Institute for Communications Engineering, Technical University of Munich, Germany)
Steiner, Fabian (Institute for Communications Engineering, Technical University of Munich, Germany)
Matuz, Balazs; Liva, Gianluigi (Institute of Communications and Navigation, German Aerospace Center (DLR), Germany)
Inhalt:
A ternary message passing (TMP) decoding algorithm for low-density parity-check codes is developed. All messages exchanged between variable and check nodes have a ternary alphabet, and the variable nodes exploit soft information from the channel. A density evolution analysis is developed for unstructured and protograph-based ensembles. For unstructured ensembles the stability condition is derived. Optimized ensembles for TMP decoding show asymptotic gains of up to 0.6 dB with respect to ensembles optimized for binary message passing decoding. Finite length simulations of codes from TMP-optimized ensembles show gains of up to 0.5 dB under TMP as compared to protograph-based codes designed for unquantized belief propagation decoding.