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A visible light communication device and method

A visible light communication and visible light technology, which is applied in the field of communication, can solve the problems of visible light communication clock out of sync and achieve the effect of maintaining synchronization and improving efficiency

Active Publication Date: 2021-12-31
YANGTZE UNIVERSITY
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  • Summary
  • 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

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  • A visible light communication device and method
  • A visible light communication device and method
  • A 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 present invention proposes a visible light communication device and method. The device includes an LED transmitting module and a visible light receiving module. The method includes: selecting n LED reference points and numbering them, and loading different The periodic signal of the same time slot modulates the transmission signal, the LED lights are all bright as the frame head, and the LED lights are all off as the frame tail; the photodetector with the optical filter in the visible light receiving module receives the LED light signal and completes the photoelectric Conversion, the sampled signal is obtained through the amplifier and the analog-to-digital converter and input to the microprocessor; the maximum value of the signal strength in the sampled signal is obtained as the beginning of the valid data as the frame header, and the minimum value of the signal strength is used as the end of the frame to represent the valid data. At the end, different data frames are obtained. The invention quickly identifies each frame of data, maintains communication synchronization and improves communication efficiency, and belongs to the technical field of 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...

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Application Information

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Patent Type & Authority Patents(China)
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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