Experimental Evaluation of a Euclidean Distances based 3-Color Shift Keying Scheme for Visible Light Communications

The new generation of wireless communications is characterized by high demands on carrier frequency, bandwidth, and of course the immunity from electromagnetic interference, areas which put the Radio Frequency (RF) spectrum under pressure. Satisfying these requirements with the present technology and infrastructure is a new technological challenge with visible light communication (VLC) being considered as a very promising area for filling some of the technological gaps and complementing the RF technology. This paper explores the use of a method based on the Euclidean Distance approach for digitizing the incoming signal of a 3-Color Shift Keying (3-CSK) optical communication scheme. According to this, the transmitter (Tx) exploits an RGB LED while the receiver (Rx) uses an RGB photodiode, aiming to compose this way a three-channel optical communication system. The efficiency of the proposed method is examined by measuring the bit error rate (BER) versus the signal-to-noise ratio (SNR) on a basic 3-CSK transceiver.