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

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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.

Original languageEnglish
Title of host publicationLight-Emitting Devices, Materials, and Applications
EditorsJong Kyu Kim, Michael R. Krames, Martin Strassburg
Place of PublicationBellingham
PublisherSPIE
Number of pages18
ISBN (Electronic)9781510625228
DOIs
Publication statusPublished - 1 Jan 2019
EventLight-Emitting Devices, Materials, and Applications 2019 - San Francisco, United States
Duration: 4 Feb 20197 Feb 2019

Publication series

NameProceedings of SPIE
Volume10940

Conference

ConferenceLight-Emitting Devices, Materials, and Applications 2019
CountryUnited States
CitySan Francisco
Period4/02/197/02/19

Keywords

  • Bandwidth
  • Channel model
  • Electron-hole
  • Equalizer
  • LED
  • Recombination
  • Visible light communication
  • Wireless optical communication
  • recombination
  • Wireless Optical Communication
  • bandwidth
  • electron-hole
  • equalizer
  • channel model
  • Visible Light Communication

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