Clipping noise-free transmission scheme in OFDM-based visible light communications

Area of Science:

• Optical Communications
• Signal Processing
• Wireless Networks

Background:

• Non-linearity in Light Emitting Diodes (LEDs) introduces clipping noise in Orthogonal Frequency Division Multiplexing (OFDM)-based Visible Light Communication (VLC) systems.
• This clipping noise significantly degrades the performance of VLC systems, impacting data transmission reliability.

Purpose of the Study:

• To propose a novel transmission scheme for mitigating clipping noise in OFDM-based VLC systems.
• To enhance the performance of VLC systems by reducing clipping noise and improving signal quality.

Main Methods:

• A three-time-slot transmission scheme is introduced.
• The scheme transmits the signs of clipping noise, the clipped signals, and the absolute values of clipping noise across these slots.
• The receiver reconstructs the original signal by decoding clipping noise signs and using them to recover the transmission signal.

Main Results:

• The proposed scheme effectively reconstructs the original transmission signals by mitigating clipping noise.
• Simulation results show superior performance compared to existing multiple-slot transmission schemes.
• Significant improvements are observed in both Peak-to-Average Power Ratio (PAPR) reduction and Bit Error Rate (BER) performance.

Conclusions:

• The novel three-time-slot transmission scheme is effective in mitigating LED non-linearity-induced clipping noise in OFDM-based VLC.
• The proposed method offers a promising solution for enhancing the reliability and efficiency of visible light communication systems.
• This approach provides a practical strategy for improving PAPR and BER metrics in VLC.