Visible Light Communication System Based on White LED

With the continuous development of mobile communication technology, people pursue faster, more convenient and cheaper communication methods. Visible light communication is a kind of wireless communication method, which has wide application prospect in broadening spectrum resources. The transmitting and receiving circuits for visible light communication are designed. White LED is the light source of the transmitting circuit. The signal is amplified and coupled to the LED, and the constant current source is used to drive the LED to realize illumination and signal transmission. Point-to-point communication is adopted in space to reduce inter-symbol interference. The receiving circuit receives the optical signal and converts it into electrical signal through PIN photodiode. After amplification and filtering, the original signal is restored. The transmission of visible light communication is realized. The design circuit is simple in structure and low in manufacturing cost. It provides reference for the research of visible light communication.