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Improving the Decoding Threshold of Tailbiting Spatially Coupled LDPC Codes by Energy Shaping

Jerkovits, Thomas and Liva, Gianluigi and Graell i Amat, Alexandre (2018) Improving the Decoding Threshold of Tailbiting Spatially Coupled LDPC Codes by Energy Shaping. IEEE Communications Letters. IEEE - Institute of Electrical and Electronics Engineers. ISSN 1089-7798

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Abstract

Abstract—We show how the iterative decoding threshold of tailbiting spatially coupled (SC) low-density parity-check (LDPC) code ensembles can be improved over the binary input additive white Gaussian noise channel by allowing the use of different transmission energies for the codeword bits. We refer to the proposed approach as energy shaping. We focus on the special case where the transmission energy of a bit is selected among two values, and where a contiguous portion of the codeword is transmitted with the largest one. Given these constraints, an optimal energy boosting policy is derived by means of protograph extrinsic information transfer analysis. We show that the threshold of tailbiting SC-LDPC code ensembles can be made close to that of terminated code ensembles while avoiding the rate loss (due to termination). The analysis is complemented by Monte Carlo simulations, which confirm the viability of the approach.

Item URL in elib:https://elib.dlr.de/118786/
Document Type:Article
Title:Improving the Decoding Threshold of Tailbiting Spatially Coupled LDPC Codes by Energy Shaping
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jerkovits, ThomasThomas.Jerkovits (at) dlr.dehttps://orcid.org/0000-0002-7538-7639
Liva, GianluigiGianluigi.Liva (at) dlr.deUNSPECIFIED
Graell i Amat, Alexandrealexandre.graell (at) chalmers.seUNSPECIFIED
Date:2018
Journal or Publication Title:IEEE Communications Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:1089-7798
Status:Published
Keywords:Convolutional LDPC codes, decoding threshold, spatial coupling, tailbiting codes
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben Multimedia Satellitennetze
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Satellite Networks
Deposited By: Jerkovits, Thomas
Deposited On:08 Feb 2018 14:21
Last Modified:06 Sep 2019 15:26

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