Li-Fi System Reliability in Real-World Deployments: SimulationBased Evaluation of QPSK Modulation and Adaptive Optimization for Noise Resilience
Edidiong Udoudom Udoudom Edidiong Udoudom Udoudom, Kufre M. Udofia, Emmanuel Oluropo Ogungbemi
Abstract
Optical wireless advancements positioned Light Fidelity (Li-Fi) as a robust alternative to radio-frequency technologies. This study evaluated Li-Fi reliability under real-world conditions using MATLAB and OptiSystem simulations, analyzing critical metrics including Q factor and Bit Error Rate (BER). A basic unmodulated configuration achieved a peak Q factor of 4.61 (BER: 1.13 × 10⁻⁶), but ambient noise degraded performance to � = 1.33 (BER: 0.091). Quadrature Phase Shift Keying (QPSK) mitigated degradation, yielding a Q factor of 21.52 (���: 5.42 × 10⁻¹⁰³), outperforming On-Off Keying (OOK) in spectral efficiency and noise resilience. Findings emphasized modulation selection and adaptive filtering to optimize signal integrity, validating Li-Fi’s viability for high-speed applications in smart homes, industrial IoT, and vehicular networks. Future work should prioritize hybrid modulation and environmental adaptability to expand Li-Fi’s utility in complex wireless ecosystems