Optical-OFDM VLC System: Peak-to-Average Power Ratio Enhancement and Performance Evaluation

Area of Science:

• Optoelectronics
• Wireless Communication
• Signal Processing

Background:

• Visible Light Communication (VLC) offers high bandwidth and EMI resilience.
• Optical Orthogonal Frequency Division Multiplexing (O-OFDM) is crucial for VLC systems.
• High Peak-to-Average Power Ratio (PAPR) is a significant challenge in O-OFDM based VLC.

Purpose of the Study:

• To explore and evaluate various O-OFDM constructions for VLC systems.
• To address and mitigate the high PAPR issue in O-OFDM VLC.
• To propose and validate a new PAPR reduction technique for enhanced VLC performance.

Main Methods:

• Investigated O-OFDM parameters: constellation size, data arrangement, spectral/power efficiency, computational complexity, BER, and PAPR.
• Proposed a non-distorting Vandermonde-Like Matrix (VLM) precoding technique for PAPR reduction.
• Implemented and tested the VLM technique across diverse O-OFDM variants (DCO-OFDM, ADO-OFDM, ACO-OFDM, FLIP-OFDM, ASCO-OFDM, LACO-OFDM).

Main Results:

• The VLM technique effectively reduces PAPR in various O-OFDM VLC systems.
• The proposed method maintains system data rate and does not require side information transmission.
• VLM precoding shows no adverse impact on Bit Error Rate (BER) performance.
• Comparative analysis demonstrates the efficacy of VLM against existing PAPR reduction methods.

Conclusions:

• The Vandermonde-Like Matrix (VLM) precoding technique is a promising solution for PAPR reduction in O-OFDM VLC systems.
• This method enhances system performance by lowering PAPR without compromising data rate or BER.
• VLM offers a valuable contribution to improving the efficiency and applicability of VLC technology.