An adaptive scaling and biasing scheme for OFDM-based visible light communication systems

Area of Science:

• Optical Communications
• Signal Processing

Background:

• Orthogonal frequency-division multiplexing (OFDM) is crucial for high-rate data transmission in visible light communication (VLC).
• Nonlinear characteristics of light emitting diodes (LEDs) and high peak-to-average-power ratio (PAPR) of OFDM signals necessitate signal scaling and biasing.
• Existing methods may not fully utilize the dynamic range of LEDs, limiting system performance.

Purpose of the Study:

• To propose an adaptive scaling and biasing scheme for OFDM-based VLC systems.
• To enhance system performance by optimizing the utilization of LED dynamic range.
• To improve the trade-off between signal power and clipping distortion.

Main Methods:

• An adaptive scheme is developed to calculate near-optimal scaling and biasing factors for each OFDM symbol.
• The scheme dynamically adjusts parameters based on the distribution of the OFDM signals.
• The method aims to maximize effective signal power while minimizing clipping distortion.

Main Results:

• The proposed adaptive scheme significantly improves system performance in OFDM-based VLC.
• The scheme effectively exploits the dynamic range of LEDs.
• Performance gains are achieved without increasing the LED's emitted power.

Conclusions:

• The adaptive scaling and biasing scheme offers a significant performance improvement for OFDM-based VLC systems.
• This approach enhances data transmission efficiency by optimizing signal modulation for LEDs.
• The method provides a practical solution for improving VLC performance with existing hardware.