Simplified model for non-line-of-sight optical camera communication with a simple patterned reflective surface

Area of Science:

• Optical Communications
• Wireless Communication Systems
• Signal Processing

Background:

• Non-line-of-sight optical camera communication (NLOS-OCC) research has primarily relied on experimental studies.
• A lack of robust mathematical models hinders simulation and theoretical analysis in NLOS-OCC.

Purpose of the Study:

• To develop a simplified mathematical model for NLOS-OCC systems utilizing patterned reflective surfaces.
• To propose a new decoding scheme for improving NLOS-OCC performance and anti-interference capabilities.

Main Methods:

• A simplified mathematical model combining diffuse reflection and rolling shutter effects was developed.
• The model generates a normalized raw pixel value matrix for camera output visualization.
• A sorting pre-decoding scheme was proposed and analyzed against conventional methods.

Main Results:

• The proposed model effectively visualizes the pixel plane output for NLOS-OCC.
• Analysis revealed limitations in conventional decoding schemes regarding threshold selection and interference.
• The sorting pre-decoding scheme demonstrated enhanced anti-interference ability by mitigating reflective surface pattern impacts.

Conclusions:

• The developed mathematical model provides a valuable tool for simulating and analyzing NLOS-OCC systems.
• The sorting pre-decoding scheme offers a significant improvement in system robustness and performance for NLOS-OCC.