Improved lower bounds on mutual information accounting for nonlinear signal–noise interaction
Artikel i vetenskaplig tidskrift, 2018

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. Through simulations, higher information rates were achieved with the SDBP, which can be explained by the ability of SDBP to account for nonlinear signal-noise interactions.

Achievable information rate

nonlinear compensation

auxiliary channel

stochastic digital backpropagation

mismatched decoding

fiber-optical communications


Naga Vishnukanth Irukulapati

Ericsson AB

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Marco Secondini

Scuola Superiore Sant'Anna (SSSUP)

Erik Agrell

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Pontus Johannisson

RISE Research Institutes of Sweden

Henk Wymeersch

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Journal of Lightwave Technology

0733-8724 (ISSN) 1558-2213 (eISSN)

Vol. 36 22 5152-5159 8456530

MIMOptics: Multimod koherent fiberoptisk kommunikation

Vetenskapsrådet (VR) (2013-5642), 2014-01-01 -- 2017-12-31.


Europeiska kommissionen (EU) (EC/FP7/258418), 2011-05-01 -- 2016-04-30.


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