PAPR analysis for OFDM visible light communication.

Area of Science:

• Optical Communications
• Signal Processing

Background:

• Orthogonal frequency-division multiplexing (OFDM) is crucial for high-speed visible light communication (VLC).
• A key limitation of OFDM in VLC is the high peak-to-average power ratio (PAPR) of the transmitted signal.
• Understanding PAPR is essential for efficient transceiver design and performance optimization in VLC systems.

Purpose of the Study:

• To analyze and compare the PAPR distributions of four distinct VLC OFDM schemes.
• To investigate the impact of lower and upper signal clipping on PAPR characteristics.
• To provide analytical derivations and practical guidelines for VLC OFDM system development.

Main Methods:

• Analytical derivation of complementary cumulative distribution functions (CCDFs) for PAPR.
• Consideration of both lower and upper clipping effects on signal waveforms.
• Numerical simulations to validate the derived analytical results.

Main Results:

• Quantified PAPR distributions for DC-biased optical OFDM (DCO-OFDM), asymmetrically clipped optical OFDM (ACO-OFDM), pulse amplitude modulated discrete multitone (PAM-DMT), and Flip-OFDM.
• Demonstrated the significant influence of lower and upper clipping on PAPR performance.
• Validated analytical models against simulation data.

Conclusions:

• The study offers a comprehensive analysis of PAPR in various clipped VLC OFDM schemes.
• The derived analytical results and insights are valuable for optimizing VLC OFDM system design.
• Clipping strategies significantly impact PAPR, requiring careful consideration in practical VLC implementations.