Reducing Environmental Noise Light Interference in Visible Light Communication Using a Solar Cell

摘要

In this study, we introduce a new method to reduce the interference of environmental noise light in a Visible Light Communication (VLC) system, using a solar cell. In the VLC transmitter a Light Emitting Diode (LED) array was used for the light source and in the VLC receiver a differential detector with a photodiode and a solar cell was used for the light detector. By subtracting the solar cell voltage from the photodiode voltage using a differential amplifier, we removed the noise contained in the photodiode voltage. In the experiment, the Signal-to-Noise Ratio (SNR) was improved by about 15 dB using the solar cell. This configuration is useful for constructing a VLC link without noise light interference in an environment where the noise light interference from a conventional fluorescent lamp or incandescent lamp is severe.