Demonstrating a real–time QAM–16 visible light communications utilizing off-the-shelf hardware

Syifaul Fuada*, Angga Pradana, Trio Adiono, Wasiu O. Popoola

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

This study aims to design, implement, and demonstrate a one-way real-time VLC system through DCO-OFDM using QAM–16 as the Mapper (Modulator). The system was divided into two units, namely VLC Server (transmitter) and Client (receiver), based on a low-bit rate transmission applications with running text, which is often found in digital signage. The uniqueness of this report focuses on the use of low-cost components for VLC transceivers, including DSP and ASP. In this condition, DCO-OFDM digital blocks were embedded within the generic-purpose Microcontroller as DSP (STM32F4 Development board), with available and widely assessed libraries being utilized for implementation in the proposed system, to speed up the DSP development process. Meanwhile, the ASP contained a linear LED driver as a substitute for the commercial Bias-T function, as well as the AFE receiver with the Op-Amps circuit blocks. The developmental approach of the VLC system was also carried out by simulation and realistic implementation, where the productions of the DSP and ASP sections, especially the DCO-OFDM with the QAM–16 mapper and the AFE receiver, were performed on MATLAB® and SPICE®, respectively. Additionally, the transfer of QAM–16 modulated data was realistically performed by observing the impact of the optical channel distance changes on the behavior of the constellation diagram.

Original languageEnglish
Article number100348
JournalResults in Optics
Volume10
Early online date3 Jan 2023
DOIs
Publication statusPublished - Feb 2023

Keywords / Materials (for Non-textual outputs)

  • Analog Front-End (AFE)
  • Linear LED driver
  • Microcontroller STM32F4
  • QAM–16
  • Real-time Visible Light Communication (VLC) System

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