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

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

Complex signal mapping
Hermitian symmetry
Light emitting diodes
Quad-light emitting diode complex modulation
Visible light communication

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.

Shaher Fleyeh Nawaf1,2, Ammar Bouallegue1, Sameh Najeh3

Journal homepage: http://journal.uad.ac.id/index.php/TELKOMNIKA

Oct 19, 2025

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