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Achievable Information Rates for Coded Modulation with Hard Decision Decoding for Coherent Fiber-Optic Systems

Sheikh, Alireza and Graell i Amat, Alexandre and Liva, Gianluigi (2017) Achievable Information Rates for Coded Modulation with Hard Decision Decoding for Coherent Fiber-Optic Systems. Journal of Lightwave Technology, 35 (23), pp. 5069-5078. IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/JLT.2017.2766978 ISSN 0733-8724

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We analyze the achievable information rates (AIRs) for coded modulation schemes with QAM constellations with both bit-wise and symbol-wise decoders, corresponding to the case where a binary code is used in combination with a higher-order modulation using the bit-interleaved coded modulation (BICM) paradigm and to the case where a nonbinary code over a field matched to the constellation size is used, respectively. In particular, we consider hard decision decoding, which is the preferable option for fiber-optic communication systems where decoding complexity is a concern. Recently, Liga et al. analyzed the AIRs for bit-wise and symbol-wise decoders considering what the authors called hard decision decoder which, however, exploits soft information of the transition probabilities of discrete-input discrete-output channel resulting from the hard detection. As such, the complexity of the decoder is essentially the same as the complexity of a soft decision decoder. In this paper, we analyze instead the AIRs for the standard hard decision decoder, commonly used in practice, where the decoding is based on the Hamming distance metric. We show that if standard hard decision decoding is used, bit-wise decoders yield significantly higher AIRs than symbol-wise decoders. As a result, contrary to the conclusion by Liga et al., binary decoders together with the BICM paradigm are preferable for spectrally efficient fiber-optic systems. We also design binary and nonbinary staircase codes and show that, in agreement with the AIRs, binary codes yield better performance.

Item URL in elib:https://elib.dlr.de/115382/
Document Type:Article
Title:Achievable Information Rates for Coded Modulation with Hard Decision Decoding for Coherent Fiber-Optic Systems
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sheikh, AlirezaChalmers Univ.UNSPECIFIED
Graell i Amat, Alexandrechalmers university of technologyUNSPECIFIED
Liva, GianluigiGianluigi.Liva (at) dlr.deUNSPECIFIED
Date:December 2017
Journal or Publication Title:Journal of Lightwave Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1109/JLT.2017.2766978
Page Range:pp. 5069-5078
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Decoding, Measurement, Information rates, Modulation, Standards, Detectors, Optical fiber communication
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: Liva, Dr. Gianluigi
Deposited On:15 Nov 2017 10:05
Last Modified:06 Sep 2019 15:19

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