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.

stochastic digital backpropagation

auxiliary channel

mismatched decoding

Achievable information rate

fiber-optical communications

nonlinear compensation

Författare

Naga Vishnukanth Irukulapati

Ericsson, Göteborg

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Kommunikationssystem

Marco Secondini

Scuola Superiore Sant'Anna (SSSUP)

Erik Agrell

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Kommunikationssystem

Pontus Johannisson

RISE Acreo

Henk Wymeersch

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Kommunikationssystem

Journal of Lightwave Technology

0733-8724 (ISSN)

Vol. 36 22 5152-5159

Styrkeområden

Informations- och kommunikationsteknik

Ämneskategorier

Kommunikationssystem

DOI

10.1109/JLT.2018.2869109

Mer information

Senast uppdaterat

2019-07-11