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

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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

Fingerprint

Light emitting diodes
Photon
light emitting diodes
Photons
nonlinearity
Nonlinearity
Volterra Series
Electrical Circuits
Equivalent Circuit
Equalizer
Optical Communication
Data Communication
photons
Communication Channels
communication
Modeling
Recombination
Simplification
Nonlinear Dynamics
Nonlinear Differential Equations

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

Cite this

Mardani, S., Alexeev, A., & Linnartz, J. P. (2019). Modeling and compensating dynamic nonlinearities in LED photon-emission rates to enhance OWC. In J. K. Kim, M. R. Krames, & M. Strassburg (Eds.), Light-Emitting Devices, Materials, and Applications [109400U] (Proceedings of SPIE; Vol. 10940). Bellingham: SPIE. https://doi.org/10.1117/12.2511099
Mardani, Shokoufeh ; Alexeev, Anton ; Linnartz, Jean Paul. / Modeling and compensating dynamic nonlinearities in LED photon-emission rates to enhance OWC. Light-Emitting Devices, Materials, and Applications. editor / Jong Kyu Kim ; Michael R. Krames ; Martin Strassburg. Bellingham : SPIE, 2019. (Proceedings of SPIE).
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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.",
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Mardani, S, Alexeev, A & Linnartz, JP 2019, Modeling and compensating dynamic nonlinearities in LED photon-emission rates to enhance OWC. in JK Kim, MR Krames & M Strassburg (eds), Light-Emitting Devices, Materials, and Applications., 109400U, Proceedings of SPIE, vol. 10940, SPIE, Bellingham, Light-Emitting Devices, Materials, and Applications 2019, San Francisco, United States, 4/02/19. https://doi.org/10.1117/12.2511099

Modeling and compensating dynamic nonlinearities in LED photon-emission rates to enhance OWC. / Mardani, Shokoufeh; Alexeev, Anton; Linnartz, Jean Paul.

Light-Emitting Devices, Materials, and Applications. ed. / Jong Kyu Kim; Michael R. Krames; Martin Strassburg. Bellingham : SPIE, 2019. 109400U (Proceedings of SPIE; Vol. 10940).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Mardani S, Alexeev A, Linnartz JP. Modeling and compensating dynamic nonlinearities in LED photon-emission rates to enhance OWC. In Kim JK, Krames MR, Strassburg M, editors, Light-Emitting Devices, Materials, and Applications. Bellingham: SPIE. 2019. 109400U. (Proceedings of SPIE). https://doi.org/10.1117/12.2511099