DefinePK

Abstract

In this paper, we introduce a new method to reduce the 120Hz noise arising from other lighting lamps adjacent to the visible light communication (VLC) system. A Cds cell was installed near the photodiode in the VLC receiver, and the Cds cell voltage was subtracted from the photodiode voltage using a differential amplifier. The Cds cell has a receiving bandwidth much lower than the photodiode, and detects the 120 Hz noise, but it does not respond to the high frequency signal light. Thus the differential output of the photodiode with the Cds cell becomes an amplified signal with the noise reduced. The signal-to-noise voltage ratio was improved by about 17.5 dB using a Cds cell in the VLC receiver.