Multiple access method based on optical two-dimensional code and visible light communication system for implementing multiple access method

Abstract

The invention discloses a multiple access method based on an optical two-dimensional code. The method includes the following steps that firstly, a base-band modulation signal is formed; secondly, a spread spectrum signal is formed; thirdly, the spread spectrum signal drives an LED lamp to send out a two-dimensional code sequence through an LED drive circuit; fourthly, the optical two-dimensional code is recognized and captured to form an image signal; fifthly, a binary digital signal is formed; sixthly, an original optical two-dimensional code information stream is restored through the binary digital signal; seventhly, information is pushed in real time. A visible light communication system of the multiple access method based on the optical two-dimensional code comprises an emission subsystem, a transmission subsystem, a receiving subsystem and a service cloud platform. The emission subsystem is provided with an OOK base-band modulation module, a CDMA encoding module, the LED drive circuit and the LED lamp. The system has the advantages that transmission content of visible light communication can be updated in real time, and corresponding information is pushed according to different application places.

Description

technical field [0001] The invention relates to visible light communication technology, in particular to a multiple access method based on an optical two-dimensional code and a visible light communication system thereof. Background technique [0002] The rise of smart homes and the rapid popularization of computers and smart devices have brought about revolutionary changes in the category of mobile digital terminals and brought a huge challenge to traditional access network technologies. Today's world is undergoing a profound change in the "Anywhere, Anytime" access method, and the society is also calling for an access method that broadens spectrum resources, is green, energy-saving, and mobile. As a result, visible light communication (VLC) technology emerged as the times require. It uses LED as a light source, and can realize high-speed information transmission while illuminating. Compared with other light sources, white LEDs have a higher modulation bandwidth, and also ...

AI Technical Summary

Problems solved by technology

The real-time push of service information is realized while lighting, and the optical two-dimensional code is used as the entrance of the business to attract consumers and become a new means of connecting O2O; the use of CDMA modulation technology improves the common background in the current VLC system Problems such as noise interference and multipath effects have improved the quality of communication; and the use of mobile phone cameras as the receiving terminal of VLC, combined with the construction of APP and push platform, enables consumers to successfully receive VLC without adding peripherals signal, realizing VLC technology to really come out of the laboratory, and promoting the further application and marketization of visible light communication technology

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