Improved Lower Bounds on Mutual Information Accounting for Nonlinear Signal--Noise Interaction

Irukulapati, Naga Vishnukanth,1987Ericsson AB, Sweden,Telefonaktiebolaget L M Ericsson,Ericsson,Chalmers tekniska högskola,Chalmers University of Technology (author)

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

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Kommunikationssystem hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Communication Systems hsv//eng
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

Secondini, MarcoTeCIP Institute, Italy,Scuola Superiore Sant'Anna di studi universitari e di perfezionamento (SSSUP),Sant'Anna School of Advanced Studies (SSSUP) (author)
Agrell, Erik,1965Chalmers University of Technology, Sweden,Chalmers tekniska högskola(Swepub:cth)agrell (author)
Johannisson, PontusRISE,Acreo,RISE Research Institutes of Sweden(Swepub:ri)pontus.johannisson@ri.se (author)
Wymeersch, Henk,1976Chalmers University of Technology, Sweden,Chalmers tekniska högskola(Swepub:cth)henkw (author)
Ericsson AB, SwedenTelefonaktiebolaget L M Ericsson (creator_code:org_t)

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