Physics-Based LED Modeling and Nonlinear Distortion Mitigating With Real-Time Implementation

Xiong Deng, Miao Zhang, Wei Pan (Corresponding author), Ziqiang Gao, Jundao Mo, Chen Chen, Xiping Wu, Xihua Zou, Lianshan Yan, Jean Paul Linnartz

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In this paper, a nonlinear model for Light Emitting Diodes (LEDs) inspired by semiconductor physics, and a corresponding post-compensator are implemented in a Field Programmable Gate Array (FPGA) for real-time Visible Light Communications (VLC). Our experiments demonstrate that the LED model effectively characterizes the dynamic LED nonlinearity, including the memory effects. The output signal of this nonlinear LED model shows a good resemblance with the measured LED output. In addition, a dedicated nonlinear equalizer, say, a post-compensator, inspired by this LED physical model can mitigate the nonlinear distortion substantially. Thereby it facilitates high data rate over the bandwidth-limited LED. It shows that the nonlinear compensator is attractive for practical real-time digital signal processing systems due to its high performance and low complexity.
Original languageEnglish
Article number7356506
Number of pages6
JournalIEEE Photonics Journal
Issue number6
Publication statusPublished - 27 Sept 2022


  • LED
  • nonlinearity
  • post-compensator
  • real-time implementation


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