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Advanced signal transformation techniques to improve spectral efficiency in visible light communication systems.

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Title: Advanced signal transformation techniques to improve spectral efficiency in visible light communication systems.
Authors: Nawaf, Shaher Fleyeh1,2 shahir.f@alimamunc.edu.iq, Bouallegue, Ammar1 ammarbouallegue.syscom@gmail.com, Najeh, Sameh3 sameh.najeh@supcom.tn
Source: Telkomnika. Dec2025, Vol. 23 Issue 6, p1449-1456. 8p.
Subjects: Quadrature amplitude modulation, Orthogonal frequency division multiplexing, MatLab (Computer software), Optical communications, Bit error rate, Bandwidths, Signal-to-noise ratio, Electronic modulation
Abstract: Visible light communication (VLC) offers high-speed wireless communication using the visible light spectrum. Achieving high spectral efficiency while maintaining a low bit error rate (BER) remains a challenge. This paper explores the use of quadrature amplitude modulation (QAM) combined with orthogonal frequency division multiplexing (OFDM) to address these challenges. Matrix laboratory (MATLAB) simulations show that QAM-OFDM achieves a BER of 0.001 at comparable signal-to-noise ratios (SNR), outperforming traditional hermitian symmetry (HS), complex signal mapping (CSM), and quad-light emitting diode (LED) complex modulation (QCM) techniques. Unlike CSM, and QCM, which increase complexity, and BER, QAM-OFDM efficiently utilizes available bandwidth, reducing errors, and enhancing spectral efficiency. The study concludes, that QAM-OFDM happens to be the optimal solution for the future VLC systems, offering better performance within both efficiency, and reliability. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Visible light communication (VLC) offers high-speed wireless communication using the visible light spectrum. Achieving high spectral efficiency while maintaining a low bit error rate (BER) remains a challenge. This paper explores the use of quadrature amplitude modulation (QAM) combined with orthogonal frequency division multiplexing (OFDM) to address these challenges. Matrix laboratory (MATLAB) simulations show that QAM-OFDM achieves a BER of 0.001 at comparable signal-to-noise ratios (SNR), outperforming traditional hermitian symmetry (HS), complex signal mapping (CSM), and quad-light emitting diode (LED) complex modulation (QCM) techniques. Unlike CSM, and QCM, which increase complexity, and BER, QAM-OFDM efficiently utilizes available bandwidth, reducing errors, and enhancing spectral efficiency. The study concludes, that QAM-OFDM happens to be the optimal solution for the future VLC systems, offering better performance within both efficiency, and reliability. [ABSTRACT FROM AUTHOR]
ISSN:16936930
DOI:10.12928/TELKOMNIKA.v23i6.26835