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Design Example01:23

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Modelling and Design of Pre-Equalizers for a Fully Operational Visible Light Communication System.

Murat Bostanoglu1, Yaser Dalveren2, Ferhat Ozgur Catak3

  • 1Department of Electrical and Electronics Engineering, Gazi University, Ankara 06570, Turkey.

Sensors (Basel, Switzerland)
|July 8, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces digital pre-equalizers for realistic Visible Light Communication (VLC) systems adhering to the IEEE 802.15.13 standard, enhancing transmission rates. A low-cost pre-equalizer design is proposed as a viable alternative for practical VLC applications.

Keywords:
digital pre-equalizationlight emitting diodelight fidelityoptical wireless communicationvisible light communication

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Area of Science:

  • Optical Communications
  • Wireless Networks
  • Signal Processing

Background:

  • Visible Light Communication (VLC) systems leverage Light Emitting Diode (LED) advancements for high-speed data transmission.
  • LED bandwidth limitations pose a significant challenge to achieving higher data rates in VLC systems.
  • Digital pre-equalizers offer a promising solution due to their structural simplicity and reusability.

Purpose of the Study:

  • To propose and evaluate digital pre-equalizers specifically for VLC systems compliant with the IEEE 802.15.13 standard.
  • To address the lack of research on implementing digital pre-equalizers in realistic IEEE 802.15.13 VLC environments.
  • To assess the performance of proposed pre-equalizers using bandwidth-efficient modulation schemes.

Main Methods:

  • Development of a realistic VLC channel model based on signal recordings from an IEEE 802.15.13 compliant system.
  • Integration of the channel model into a MATLAB-based VLC system simulation.
  • Design and simulation of two distinct digital pre-equalizers to evaluate Bit Error Rate (BER) performance.

Main Results:

  • Simulations demonstrate the feasibility of the proposed digital pre-equalizers in the IEEE 802.15.13 VLC system.
  • Both pre-equalizers were evaluated under 64-QAM and 256-QAM modulation schemes.
  • The second pre-equalizer achieved lower BERs but presented higher implementation costs compared to the first design.

Conclusions:

  • The first digital pre-equalizer design is identified as a cost-effective alternative for practical implementation in IEEE 802.15.13 VLC systems.
  • The study validates the effectiveness of digital pre-equalization in mitigating bandwidth limitations in VLC.
  • Further research may explore optimizing the second pre-equalizer for improved cost-performance trade-offs.