Improved lower bounds on mutual information accounting for nonlinear signal–noise interaction
Journal article, 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

mismatched decoding

fiber-optical communications

auxiliary channel

stochastic digital backpropagation

Author

Naga Vishnukanth Irukulapati

Ericsson, Göteborg

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Marco Secondini

Sant'Anna School of Advanced Studies (SSSUP)

Erik Agrell

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Pontus Johannisson

RISE Research Institutes of Sweden

Henk Wymeersch

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Journal of Lightwave Technology

0733-8724 (ISSN)

Vol. 36 22 5152-5159

Cooperative Situational Awareness for Wireless Networks (COOPNET)

European Commission (FP7), 2011-05-01 -- 2016-04-30.

MIMOptics: Multi-mode coherent fiber-optical communications

Swedish Research Council (VR), 2014-01-01 -- 2017-12-31.

Areas of Advance

Information and Communication Technology

Subject Categories

Communication Systems

DOI

10.1109/JLT.2018.2869109

More information

Latest update

10/3/2019