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Mobile phone audio interface-based visible light close communication system and method

A technology of short-distance communication and audio interface, which is applied in the direction of short-distance systems and free space transmission, so as to avoid the authentication process, reduce restrictions, and ensure privacy and security.

Inactive Publication Date: 2014-06-18
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the limitations of the use of existing NFC smartphones and the limitations of the built-in LEDs of the mobile phone, the present invention provides a visible light short-distance communication system and method based on the audio interface of the mobile phone

Method used

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  • Mobile phone audio interface-based visible light close communication system and method
  • Mobile phone audio interface-based visible light close communication system and method

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0026] Such as figure 1 As shown, the visible light short-distance communication system based on the audio interface of the mobile phone in this embodiment is composed of two parts: a transmitting end and a receiving end that communicate through a visible light channel.

[0027] The sending end includes an external LED module 10 and a smart phone. The coding module 11 and the application program 12 are configured in the smart phone, and the external LED module 10 is connected to the audio interface (earphone jack) of the smart phone.

[0028] The application program 12 receives the original data to be transmitted, and the encoding module 11 adds the CRC check code to the original data, packs the data in a prescribed frame format, encodes it according to the serial port communication protocol, and then uses the encoded data to process the audi...

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Abstract

The invention relates to a mobile phone audio interface-based visible light close communication system and method. The system comprises a transmitting terminal of a mobile phone with an external LED (light emitting diode) module and an installed encoding module, and a receiving terminal with a light ray sensor, a decoding module and application software, wherein the LED module is connected to the audio interface of the smart mobile phone; the encoding module packages and encodes original data, modulates an audio signal by using the encoded data and transmits to the LED module, and the audio signal is changed into a visible light signal to be sent; the light ray sensor receives the visible light signal and transforms the visible light signal into an electric signal, and data packets are acquired by decoding via the decoding module; whether data in each data packet can pass CRC (cyclic redundancy check) or not is judged, and if so, the decoded data are transmitted to the application software to be processed. Transforming hardware of mobile equipment is not needed, visible light close communication can be realized by the external LED module, and the system and the method can be widely applied in near field communication application scenes such as mobile payment, equipment pairing and data exchange between mobile phone users.

Description

technical field [0001] The invention belongs to the field of short-distance wireless communication, and in particular relates to a visible light short-distance communication system and method based on an audio interface of a mobile phone. Background technique [0002] In addition to Bluetooth, WIFI, and infrared data transmission, the short-range communication technology widely used on mobile devices currently has short-range communication NFC technology. [0003] NFC chips installed on devices such as mobile phones can realize electronic payment or read information of other NFC devices or tags. However, due to the cost of NFC, currently only a limited number of mobile phone platforms are equipped with built-in NFC chips, and low-end mobile phones rarely have built-in NFC chips. [0004] Visible Light Communication (VLC) is an emerging optical wireless communication technology based on visible light (400THz-790THz). Due to its LoS (Line of Sight) characteristics, VLC can pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116
Inventor 权进国蔡昌宏钟俊峰戚峰廖世迁金爽
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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