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Modeling and compensating dynamic nonlinearities in LED photon-emission rates to enhance OWC
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Paper Abstract

LEDs can be modulated at relatively high speeds to support wireless optical data communication (OWC). Yet, particularly LEDs optimized for illumination act as a non-linear low-pass communication channel. It has become clear in recent literature that their non-linearity and low-pass behavior cannot be seen as two separable, cascaded mechanisms. Although standard nonlinear equalizer schemes, e.g. based on Volterra Series, have been proposed and tested before, our recent research results show that a more dedicated approach in which we specifically analyze the hole-electron recombination mechanisms, yield a very effective and computationally-efficient compensation approach. In this manuscript, we will review the non-linear differential equations for photon emissions, its electrical equivalent circuit and a discrete-time variant with delays and non-linearities. This can be inverted, in the sense that we can actively eliminate or mitigate the non-linear dynamic LED distortion by adequate signal processing. We propose an aggressive simplification of the compensation circuit that allows us to use a relatively simple structure with only a couple of parameters.

Paper Details

Date Published: 1 March 2019
PDF: 18 pages
Proc. SPIE 10940, Light-Emitting Devices, Materials, and Applications, 109400U (1 March 2019); doi: 10.1117/12.2511099
Show Author Affiliations
Shokoufeh Mardani, Eindhoven Univ. of Technology (Netherlands)
Anton Alexeev, Eindhoven Univ. of Technology (Netherlands)
Jean-Paul Linnartz, Eindhoven Univ. of Technology (Netherlands)
Signify (Netherlands)

Published in SPIE Proceedings Vol. 10940:
Light-Emitting Devices, Materials, and Applications
Jong Kyu Kim; Michael R. Krames; Martin Strassburg, Editor(s)

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