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Visible light communication method and visible light communication system based on dual modulation technology

A visible light communication and dual modulation technology, applied in the field of visible light communication, can solve problems such as increasing the complexity of visible light communication systems, and achieve the effects of improving quality and channel capacity, data transmission rate, and channel stability.

Active Publication Date: 2017-10-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it greatly increases the complexity of the visible light communication system

Method used

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  • Visible light communication method and visible light communication system based on dual modulation technology
  • Visible light communication method and visible light communication system based on dual modulation technology
  • Visible light communication method and visible light communication system based on dual modulation technology

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Embodiment

[0039] Such as figure 1 As shown, a visible light communication system based on pulse amplitude modulation includes: a transmitting subsystem, a transmitting subsystem, and a receiving subsystem. In the transmitting subsystem, the camera receives the real-time video signal and transmits it to the first liquid crystal display through the first programmable gate array, displays the original video signal, and transmits the original video signal to the LED drive circuit through modulation and corresponding video signal processing technology. Coupling the DC signal and the AC signal with the inductor ensures that the signal will not be lost in the LED, Figure 2a and Figure 2b It is a schematic diagram of COB packaged LED lamp and LED drive circuit; the LED lamp is a 4×4 LED array, and 16 chips are packaged on the PCB circuit board through COB packaging technology.

[0040] Such as image 3 As shown, after the video data is read in, each frame of video can be seen as an RGB ima...

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PUM

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Abstract

The invention discloses a visible light communication method based on dual modulation technology, comprising the following steps: 1. The first programmable gate array converts the video signal sent by the signal source into an n-bit binary digital signal; 2. The first programmable gate array Convert each group of n-bit binary digital signals into n2-ary digital signals; 3. The first programmable gate array superimposes the n2-level pulse amplitude modulation and pulse width modulation to form n2+k-level light intensity Variation; 4. The receiving subsystem restores the original signal; the present invention also discloses a visible light communication system that implements a visible light communication method based on dual modulation technology, including: a transmitting subsystem, a transmitting subsystem and a receiving subsystem. It has the advantages of being able to optimize the light source of the visible light communication system from the perspectives of illumination and communication, and has broad application prospects.

Description

technical field [0001] The present invention relates to visible light communication technology, in particular to a visible light communication method based on dual modulation technology and its visible light communication system. The present invention is a dual modulation technology combining pulse amplitude modulation technology and pulse width dimming technology and realizing data transmission and reception Methods. Background technique [0002] In recent years, semiconductor lighting technology known as "green lighting" has developed rapidly. Compared with traditional lighting sources such as incandescent lamps, LEDs have the advantages of low power consumption, long life, small size, and environmental protection. At the same time, LED has the advantages of good modulation performance and high response sensitivity. The signal is loaded on the LED with a high frequency that cannot be recognized by the human eye for transmission, and then a technology that can realize the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B10/516
Inventor 文尚胜关伟鹏张恒宋鹏程
Owner SOUTH CHINA UNIV OF TECH
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