A Study on the LED VLC Trans-Receiver Module for Use of Ubiquitous-Sensor Network and Its Efficiency

This study aims to implement a VLC (Visible Light Communication) trans-receiver module media-transfer system using LED (Light Emitting Diode) white lighting based on PC modules, while analyzing its efficiency of transfer technology. LED lighting can control different wavelength lights depending on materials and components, and it is possible to communicate by transferring data through the light of LED lighting. To implement an LED VLC, this study intends to use 12-LED light emitting displays for the transmission part and widely-known infrared sensors for the receiver part. For the trans-receiver developed for LED VLC, a visible media transfer system was established with the initial distance value set as over 30cm, and the entire system transmission speed set as 125kbps. To analyze the performance of an implemented module, this study installed LED and infrared sensors on the PC module and showed prediction and communication distances, while attempting to confirm its application methods and possibility. To increase the overall efficiency of an LED module, this study measured its different performance with lens equipped and unequipped respectively and found out its efficiency increased by about 20%.