ABSTRACT
Using LED lights as communication base stations to transmit information has become one of the hot research topics in the field of wireless optical communication at home and abroad. White LEDs with high brightness, a low power consumption, and having the advantages of a long service life, a small size, and offering green environmental protection, are regarded as the fourth generation of light source for energy saving and environmental protection. Not only that, white LEDs also have the advantages of high response sensitivity and good modulation characteristics. By using the above excellent properties of LED in a lamp, the signal is modulated to LED visible light for transmission, thereby achieving a new type of wireless optical communication technology, Visible Light Communication (VLC). VLC technology has the advantages of being eye-safe. It is not necessary to apply for a radio frequency card and it has no electromagnetic interference. It provides a new data access method for optical communication etc. It has been widely concerned. Recently, the research on visible light communication system is just as effective in China. Alongside in-depth research concerning LED light source modulation characteristics, the indoor wireless channel, and visible light modulation technology, the advantages of visible light communication technology have been gradually revealed: the LED visible light for indoorwireless channel controls can greatly reduce the cable control cost. The control terminal can transmit the signal through the network, and the new technology can cooperate with the Internet closely, so it becomes a very attractive prospect. A visible light communication system is very suitable for application in exhibition guides, intelligent traffic systems, hospitals, laboratory information transmission, etc.
