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Multi-User Precoder Designs for RGB Visible Light Communication Systems.

Roser Viñals1,2, Olga Muñoz1, Adrián Agustín1

  • 1The Department of Signal Theory and Comunications, Universitat Politècnica de Catalunya (UPC); 08034 Barcelona, Spain.

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Summary

This study introduces a new zero-forcing (ZF) precoder for Red-Green-Blue light-emitting diode (RGB-LED) visible light communication (VLC) systems, enhancing data transmission rates for multiple users. Performance is evaluated against traditional phosphor-coated white light-emitting diode (PWLED) systems.

Keywords:
RGB-LEDsRed-Green-Blueadaptive modulationlinear precodingmulti-uservisible light communicationsweighted sum-rate maximizationzero forcing

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Area of Science:

  • Optical Communications
  • Signal Processing

Background:

  • Visible Light Communication (VLC) systems offer a promising wireless communication technology.
  • Traditional systems often use phosphor-coated white light-emitting diodes (PWLEDs).
  • Red-Green-Blue light-emitting diodes (RGB-LEDs) allow for modulation of multiple data streams.

Purpose of the Study:

  • To design and evaluate linear precoders for multi-user VLC systems utilizing RGB-LEDs.
  • To maximize the weighted sum rate using a zero-forcing (ZF) precoder with multilevel pulse amplitude modulation (M-PAM).
  • To compare the performance of RGB-LED based systems against PWLED based systems.

Main Methods:

  • Design of a zero-forcing (ZF) precoder for RGB-LED VLC systems.
  • Optimization of precoder for multilevel pulse amplitude modulation (M-PAM).
  • Consideration of system constraints: limited power, non-negative amplitude, and white light emission.

Main Results:

  • A ZF precoder design is proposed for RGB-LED based VLC systems.
  • The design addresses challenges specific to RGB-LEDs, including power and white light constraints.
  • Performance evaluation comparing RGB-LED and PWLED systems is conducted.

Conclusions:

  • The proposed ZF precoder design is suitable for enhancing data rates in RGB-LED VLC systems.
  • RGB-LED systems present unique design challenges that can be overcome with advanced precoding techniques.
  • The study provides a comparative analysis of RGB-LED and PWLED VLC system performance.