An Adaptive Noise Suppression and Detection Framework for SEE-OFDM VLC Links

Abstract

This paper investigates the optimization of Spectral and Energy Efficient Orthogonal Frequency Division Multiplexing (SEE-OFDM) for Visible Light Communication (VLC) systems, with a primary focus on mitigating the high Peak-to-Average Power Ratio (PAPR) and its adverse effects. Although SEE-OFDM enhances power efficiency by transmitting only positive signal components, it remains highly susceptible to LED nonlinearity, which introduces clipping distortion and degrades system performance. To address this challenge, a hybrid signal processing framework incorporating transform-based precoding, nonlinear companding, and time-domain noise cancellation is proposed. The combined approach effectively reduces PAPR and improves Bit Error Rate (BER) performance under nonlinear conditions. Simulation results demonstrate that the proposed methods significantly enhance signal integrity and transmission reliability while maintaining energy efficiency. This work provides a practical and robust solution for enabling high-speed, reliable VLC systems in the presence of hardware nonlinearity.