VLC system is a communication system using visible light to transmit information.
The system consists of a transmitter and a receiver with the LEDs at the transmitting
end and the photodiode at the receiving end.
The luminescence intensity of the LEDs will be modulated according to data
signal at high frequency at transmitter. The receiver (i.e. the photodiode) will then
convert the light intensity into an electrical signal in order to receive the transmitted
data.