A visible light communication system and method based on dimming accumulation

Abstract

The invention discloses a visible light communication system based on dimming accumulation. The system comprises a sending terminal and a receiving terminal. The sending terminal and the receiving terminal are connected through a wireless light communication mode. The sending terminal comprises a data coding module, a pulse position modulation module, a light source driving module, a dimming module and an RGB LED light source. The receiving terminal comprises a photoelectric detection module, a transresistance amplification module, an analog-digital sampling module, a pulse position decision module, a pulse position demodulation module and a data decoding module. In the invention, on the sending terminal, a combined dimming method is adopted to synthesize white light, under the different environments, an appropriate light path is selected to carry out information transmission, white light illumination is realized and simultaneously spatial long distance communication or underwater communication is completed; and on the receiving terminal, an accumulation comparison decision method is adopted, a signal acquired through sampling is judged, wrong judgment condition are reduced and system reliability is increased.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a visible light communication system and method based on dimming and accumulation. Background technique [0002] In current visible light communication (VLC) systems, most of the white light sources used are blue LEDs mixed with phosphors to generate the required white light. When driving the LED to emit light, the blue light source is first driven, followed by the phosphor, and the driving response speed of the blue light is much faster than that of the phosphor, so the modulation bandwidth will become smaller, and even cause color differences. [0003] In addition, most of the judgment methods adopted in the existing visible light communication system are similar to the judgment methods in the digital communication system, that is, the signal at the receiving end is compared with the set threshold value for judgment. When the signal at the receiving end is greate...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of poor reliability in the existing visible light communication, providing a visible light communication system and method based on dimming accumulation

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