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Ambient LED Light Noise Reduction Using Adaptive Differential Equalization in Li-Fi Wireless Link.

Yong-Yuk Won1, Sang Min Yoon2, Dongsun Seo1

  • 1Department of Electronic Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin 17058, Korea.

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|February 9, 2021
PubMed
Summary

This study introduces an adaptive differential equalization (ADE) technique to reduce noise in Li-Fi wireless links. The method significantly improves signal quality and maintains performance even with increased ambient light interference.

Keywords:
Li-Fiadaptive differential equalizationambient light noisedigital signal processinglight-emitting diodesvisible light communication

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Area of Science:

  • Optical Wireless Communications
  • Signal Processing

Background:

  • Li-Fi (Light Fidelity) systems utilize white light-emitting diodes for wireless data transmission.
  • Ambient light sources and internal system noise can degrade signal quality in Li-Fi links.
  • Existing equalization techniques may not sufficiently address the specific noise characteristics in Li-Fi.

Purpose of the Study:

  • To propose and evaluate an adaptive differential equalization (ADE) technique for Li-Fi systems.
  • To mitigate various noise sources, including interference and shot noise from ambient light.
  • To enhance the signal-to-noise ratio (SNR) and bit error rate (BER) performance of Li-Fi links.

Main Methods:

  • Development of an adaptive differential equalization (ADE) algorithm.
  • Exploitation of waveform differences between digital signals and analog noise for noise reduction.
  • Integration of a weighting function reflecting Poisson characteristics of shot noise.
  • Experimental validation using an optical wireless link with non-return-to-zero on-off keying (NRZ-OOK) signals.

Main Results:

  • Achieved a 7.5 dB improvement in signal-to-noise ratio (SNR) at the first-generation forward error correction (FEC) threshold (BER of 8 × 10-5).
  • Demonstrated the ability to maintain a BER of 1 × 10-5 despite a 6 dB increase in ambient light intensity.
  • Effectively reduced interference and shot noise through the proposed ADE technique.

Conclusions:

  • The proposed ADE technique offers significant noise reduction for Li-Fi wireless links.
  • This method enhances transmission reliability and performance in the presence of ambient light interference.
  • ADE is a promising approach for improving the robustness and efficiency of Li-Fi communication systems.