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An Open-Source QAM MODEM for Visible Light Communication in FPGA for Real-Time Applications.

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  • 1Information Engineering Department, University of Florence, St. S.Marta No. 3, 50129 Florence, Italy.

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Summary
This summary is machine-generated.

This study introduces a novel, resource-efficient algorithm for real-time Visible Light Communication (VLC) using Quadrature Amplitude Modulation (QAM) on an FPGA. Experimental results show low-latency links up to 6 Mb/s, overcoming bandwidth limitations.

Keywords:
FPGAQuadrature Amplitude Modulation (QAM)VHDLVisible Light Communications (VLC)low-latencyopen-source codereal-time

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Area of Science:

  • Electrical Engineering and Computer Science
  • Optical Communications
  • Wireless Networking

Background:

  • Visible Light Communication (VLC) offers high data rates and low latency, crucial for automotive and other applications.
  • Existing white LED-based VLC systems face bandwidth limitations (MHz range), hindering high-speed applications.
  • High-order modulation like Quadrature Amplitude Modulation (QAM) improves spectral efficiency but presents implementation challenges for real-time, low-latency systems.

Purpose of the Study:

  • To address the lack of experimental validation for low-latency, real-time VLC links.
  • To propose and implement a resource-efficient QAM modulator/demodulator (MODEM) on an FPGA for real-time VLC.
  • To provide an open-source, scalable foundation for future low-latency VLC research.

Main Methods:

  • Development of a modified, computationally efficient QAM algorithm tailored for FPGA implementation.
  • Integration of a synchronization loop within the proposed algorithm.
  • Experimental validation using a white-phosphor-power LED and varying QAM constellations (4-, 16-, 64-QAM).

Main Results:

  • Successful demonstration of real-time VLC links operating at 2, 4, and 6 Mb/s using 4-, 16-, and 64-QAM, respectively.
  • Achieved ultra-low latency measurements of less than 1.3 μs.
  • The proposed MODEM is available as open-source code.

Conclusions:

  • The developed FPGA-based QAM MODEM effectively overcomes bandwidth limitations in white LED VLC.
  • The system enables high-speed, low-latency real-time VLC, validated experimentally.
  • The open-source nature of the solution facilitates further research and development in advanced VLC systems.