Long-distance visible light communication system

Abstract

The invention provides a long-distance visible light communication system. The long-distance visible light communication system comprises an upper computer, a level conversion circuit, a single chip microcomputer, an optical transmitter and an optical receiver. Firstly, a user inputs information to be transmitted on the upper computer and performs communications through the level conversion circuit and the single chip microcomputer; the single chip microcomputer inputs the information into an encoding circuit to encode the information in order to obtain a digital signal; the digital signal is loaded to an LED (Light-Emitting Diode) through a driving circuit; an electric signal is converted into an optical signal; the optical signal is transmitted through a transmitting end lens; the optical receiver converges the optical signal through a receiving end lens; background light noise is filtered out of light beams through a light filter; a photoelectric detector detects the optical signal, and converts the optical signal into an electric signal; a low-noise amplifier at a front end performs low-noise amplification on the received optical signal; the electric signal enters a subsequent decoding circuit after passing through a summing circuit and a filtering circuit; the decoding circuit recovers the transmitted information, and transmits the information to the single chip microcomputer; and lastly, the information is displayed on the upper computer. Through adoption of the long-distance visible light communication system, the problems of low communication rate, high error rate and low automatic degree in the prior art are solved.

Description

technical field [0001] The invention relates to the field of visible light communication, in particular to a long-distance visible light communication system. Background technique [0002] The existing visible light communication system is simple in operation, strong in practicability, not susceptible to electromagnetic interference, and high in security and confidentiality. Its disadvantages are low communication rate and high error rate. At present, the transmission rate of lighting communication is less than 1bit / s, and it is necessary to continue to use manual ARQ for error correction feedback. The degree of automation is low. Communication personnel receive professional training, which takes a long time and requires high skills. Contents of the invention [0003] The invention provides a long-distance visible light communication system, which solves the problems of low communication rate, high error rate and low degree of automation in the prior art. [0004] The pre...

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Problems solved by technology

[0003] The invention provides a long-distance visible light communication system, which solves the problems of low communication rate, high error rate and low degree of automation in the prior art

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