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Visible light communication method based on LEDs and mobile phone camera

A technology of visible light communication and mobile phone, which is applied in the field of visible light communication to improve data transmission capability, solve frame synchronization problems, and ensure security and stability

Active Publication Date: 2018-09-18
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The widely used passive RFID technology uses radio frequency signals to power the electronic tags and read the data contained in them. This form of communication is more convenient, but requires additional reader equipment.

Method used

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  • Visible light communication method based on LEDs and mobile phone camera
  • Visible light communication method based on LEDs and mobile phone camera
  • Visible light communication method based on LEDs and mobile phone camera

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0034] figure 1 A flow chart showing data processing according to the communication protocol is shown. It mainly includes the flow of visible light signal sending end 1 and the flow of receiving end 2. The process at the sending end includes data encoding, adding frame headers and LED dot matrix display. The process at the receiving end includes capturing images, extracting data frames, and decoding data. The specific steps of the sender are as follows:

[0035] Step 1. Express the data to be transmitted in the form of a character string, that is, use an ASCII code of 8 binary digits to represent a character. After ASCII encoding, a binary string consisting of 0 and 1 is obtained.

[0036] Step 2: Perform Base64 encoding on the binary string with 6 binary bits as a unit to obtain a Base64 character string.

[0037] Step 3: Express the obtaine...

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PUM

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Abstract

The invention provides a visible light communication method based on LEDs and a mobile phone camera. In a visible light communication system, a sending terminal codes data that needs to be transmittedinto a binary data stream, and then the binary data stream is represented by an LED dot matrix; and when a receiving terminal successfully read information represented by the LED dot matrix, each data frame is decoded to obtain the data that originally needs to be transmitted. The visible light communication method can make the visible light communication system stably and safely transmit data. When the LED dot matrix and the mobile phone camera present different rotation angles, the data can still be rapidly and stably read.

Description

technical field [0001] The present invention relates to the field of data communication, and more specifically, to a visible light communication method based on LED and mobile phone camera. Background technique [0002] The widely used passive radio frequency identification technology uses radio frequency signals to power the electronic tags and read the data information contained in them. This form of communication is more convenient, but requires additional reader equipment. In contrast, using visible light to communicate is not only simple but also requires no additional equipment. This characteristic makes visible light communication technology receive more and more attention. Moreover, the use of light-emitting devices like LED lamps is very popular, which makes these light-emitting devices may become the transmitter of visible light signals, so that the deployment of visible light communication systems will become very easy. [0003] In addition, with the development...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04J3/06
CPCH04B10/116H04J3/0605
Inventor 张建辉张天豪姜飞龙甘家羽
Owner HANGZHOU DIANZI UNIV
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