Single cell three-channel wavelength division multiplexing in visible light communication

Area of Science:

• Biomedical Engineering
• Optical Communications
• Wireless Health

Background:

• Indoor healthcare environments often face challenges with radio frequency (RF) interference and electromagnetic compatibility.
• There is a growing need for reliable, low-complexity wireless communication systems within healthcare settings.
• Visible Light Communication (VLC) offers a potential RF-free alternative for data transmission.

Purpose of the Study:

• To design and prototype a single-cell, three-channel Visible Light Communication (VLC) system for RF-free indoor healthcare applications.
• To explore the feasibility of using a Red Green Blue (RGB)-type white light-emitting diode (LED) and a single color sensor for simultaneous data transmission and reception.
• To develop a robust system capable of real-time patient data monitoring and analysis.

Main Methods:

• A prototype system utilizing a single RGB-type white LED as the transmitter.
• Implementation of a single color sensor for receiving tri-color light signals.
• Employment of an active low-pass filter to mitigate ambient light and low-frequency noise.
• Development of a receiver processor for simultaneous demodulation and data analysis.

Main Results:

• Successful demonstration of a functional three-channel VLC system using a single LED and sensor.
• Effective filtering of ambient light and noise, ensuring robust signal detection.
• Real-time monitoring and analysis of patient data transmitted via light signals.
• Validation of the system's suitability for low-complexity, RF-free healthcare applications.

Conclusions:

• The designed VLC system provides a viable RF-free communication solution for indoor healthcare.
• The use of a single RGB-LED and color sensor offers a cost-effective and low-complexity approach.
• The system enables reliable real-time patient data monitoring, supporting timely medical attention.