Improved TKM-TR methods for PAPR reduction of DCO-OFDM visible light communications.

Area of Science:

• Optical Communications
• Signal Processing

Background:

• Visible Light Communication (VLC) systems utilize DCO-OFDM, but suffer from high PAPR.
• Existing PAPR reduction techniques for DCO-OFDM have limitations.

Purpose of the Study:

• To address the high PAPR issue in DCO-OFDM systems.
• To propose and evaluate an improved tone reservation (TR) technique based on time domain kernel matrix (TKM-TR).

Main Methods:

• An improved TKM-TR scheme is proposed to eliminate peak regrowth by optimizing scaling factors.
• Particle Swarm Optimization (PSO) is employed to find optimal clipping ratio (CR) for enhanced PAPR reduction.
• The proposed methods are applied to DCO-OFDM systems.

Main Results:

• The improved TKM-TR scheme effectively resolves the tailing problem of previous methods.
• The PSO-based TKM-TR scheme achieves significant PAPR reduction.
• Lower bit error rates (BER) are observed with the PSO-based TKM-TR scheme.

Conclusions:

• The developed TKM-TR schemes offer effective PAPR reduction for DCO-OFDM systems.
• PSO integration enhances PAPR reduction and BER performance in VLC systems.