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Improved Lower Bounds on Mutual Information Accounting for Nonlinear Signal--Noise Interaction
Ericsson AB, Sweden.
TeCIP Institute, Italy.
Chalmers University of Technology, Sweden.
RISE - Research Institutes of Sweden, ICT, Acreo.ORCID iD: 0000-0003-1793-4451
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2018 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 36, no 22, p. 5152-5159Article in journal (Refereed) Published
Abstract [en]

In fiber-optic communications, evaluation of mutual information (MI) is still an open issue due to the unavailability of an exact and mathematically tractable channel model. Traditionally, lower bounds on MI are computed by approximating the (original) channel with an auxiliary forward channel. In this paper, lower bounds are computed using an auxiliary backward channel, which has not been previously considered in the context of fiber-optic communications. Distributions obtained through two variations of the stochastic digital backpropagation (SDBP) algorithm are used as auxiliary backward channels and these bounds are compared with bounds obtained through the conventional digital backpropagation (DBP). Through simulations, higher information rates were achieved with SDBP, which can be explained by the ability of SDBP to account for nonlinear signal--noise interactions

Place, publisher, year, edition, pages
2018. Vol. 36, no 22, p. 5152-5159
Keywords [en]
Achievable information rate, auxiliary channel, fiber-optical communications, mismatched decoding, nonlinear compensation, stochastic digital backpropagation, Backpropagation algorithms, Fiber optics, Nonlinear optics, Signal noise measurement, Stochastic systems, Digital backpropagation, Fiber optical communications, Non-linear compensations, Optical fiber communication
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-35200DOI: 10.1109/JLT.2018.2869109Scopus ID: 2-s2.0-85052855904OAI: oai:DiVA.org:ri-35200DiVA, id: diva2:1254851
Available from: 2018-10-10 Created: 2018-10-10 Last updated: 2019-06-27Bibliographically approved

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Johannisson, Pontus

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