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Visible light communication device and method

A visible light communication and visible light technology, applied in the field of communication, can solve the problem of clock out of sync in visible light communication

Active Publication Date: 2019-03-22
YANGTZE UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a visible light communication device and method to solve the problem of visible light communication clock out of synchronization, so that the signal receiving end can quickly and correctly identify each frame of data and maintain communication synchronization

Method used

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  • Visible light communication device and method
  • Visible light communication device and method

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Embodiment Construction

[0024] The present invention proposes a visible light communication device and method, which enable a signal receiving end to quickly and correctly identify each frame of data during data transmission and maintain communication synchronization.

[0025] See figure 1 , the present invention provides a visible light communication device, the device includes n (n>2) LED transmitting modules and a visible light receiving module, the LED transmitting module is connected with the visible light receiving module by visible light communication; the LED transmitting The module includes an LED lamp and a constant current source driving circuit, and the visible light receiving module includes an optical filter, a photodetector, an amplifier, an analog-to-digital converter, and a microprocessor;

[0026] The LED transmitting module is used to load periodic signals of different time slots in the constant current source drive circuit to modulate the transmitting signal. During the modulation...

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Abstract

The invention provides a visible light communication device and method. The device comprises an LED emission module and a visible light receiving module; the method comprises the following steps: selecting n LED reference points and numbering the reference points; loading periodic signals at different time slots in a driving circuit of the LED emission module, and modulating the emission signals,wherein the LED lamps are fully brightened as a frame head, and the LED lamps are fully darkened as the frame tail; receiving the LED light signal by using a photoelectric detector with an optical filter in the visible light module, and accomplishing photoelectric conversion, acquiring sampling signals through an amplifier and an analog-to-digital converter, and inputting the sampling signal intoa microprocessor; acquiring the maximum signal intensity value in the sampling signal as the frame head to represent the beginning of the effective data, and acquiring the minimum signal intensity value as the frame tail to represent the end of the effective data, thereby obtaining different data frames. Through the device and method provided by the invention, each frame of data can be quickly identified, the communication synchronization can be maintained, the communication efficiency is improved, and the method and device belong to the technical field of the communication.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a visible light communication device and method. Background technique [0002] Visible light communication is a new high-speed data transmission technology that uses light from semiconductor lighting. Visible light communication technology loads high-frequency signals that cannot be recognized by human eyes onto light-emitting diodes (LEDs) for transmission, making LEDs integrate lighting and communication functions. Visible light communication technology is green and low-carbon, and can achieve nearly zero energy consumption. It can effectively avoid weaknesses such as radio communication electromagnetic signal leakage, and quickly build an anti-interference and anti-interception security information space, which has broad application prospects. [0003] For example, indoor positioning is an important application field of visible light communication technology...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/50H04B10/516H04B10/60
CPCH04B10/116H04B10/502H04B10/516H04B10/60
Inventor 罗明璋李修权黑创张鑫宋钢兵刘杰李少军张俊强吴子樊
Owner YANGTZE UNIVERSITY
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