Single-scatter path loss model of LED-based non-line-of-sight ultraviolet communications

Area of Science:

• Optical Communications
• Wireless Networks
• Photonics

Background:

• Non-line-of-sight (NLOS) ultraviolet communications (UVC) utilize light-emitting diodes (LEDs) as light sources.
• Existing path loss (PL) models for NLOS UVC systems assume uniform radiant intensity, failing to accurately represent LED emission patterns.

Purpose of the Study:

• To develop a more accurate single-scatter path loss (PL) model for LED-based NLOS UVC systems.
• To improve the characterization of LED light emission patterns in UVC link modeling.

Main Methods:

• Modeling the LED emission pattern as a Lambertian distribution.
• Deriving an analytical expression for the single-scatter PL model.
• Validating the model using Monte Carlo simulations and experimental results.

Main Results:

• The proposed PL model accurately predicts path loss in practical NLOS UVC scenarios.
• The model achieved a root-mean-square error of approximately 1 dB compared to experimental data.
• The new model offers simpler implementation compared to previous models with uniform emission assumptions.

Conclusions:

• The Lambertian-based PL model provides a significant improvement in accuracy for LED-based NLOS UVC systems.
• This enhanced model facilitates more reliable design and performance analysis of UVC communication links.
• The model's ease of implementation promotes its adoption in the field of optical wireless communications.