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A Coordinated Coding Modulation Control Method for Wireless Optical Communication

A wireless optical communication and control method technology, applied in the field of wireless optical communication, can solve the problems of unstable LED light output, unstable communication rate, low energy utilization rate, etc., achieve green and environmental protection communication mode, improve bandwidth utilization rate, high-speed communication speed effect

Active Publication Date: 2019-08-27
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the traditional single OOK, PPM, etc. are used, at the cost of sacrificing the bandwidth of the symbol, the bandwidth occupied by the signal is reduced, and the impact of the signal on the lighting is reduced, but the energy utilization rate of this coding method is low, and when the transmission rate is low , there will be LED flickering, that is, the LED light is unstable
To sum up, these methods all have a drawback, the communication rate will change with the lighting intensity requirements, resulting in unstable communication rate

Method used

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  • A Coordinated Coding Modulation Control Method for Wireless Optical Communication
  • A Coordinated Coding Modulation Control Method for Wireless Optical Communication
  • A Coordinated Coding Modulation Control Method for Wireless Optical Communication

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Embodiment Construction

[0023] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] The principle of VPPM-CSK joint modulation proposed in the present invention is to load the data source information on the RGB three light-emitting diodes of the three-color LED respectively, and each light-emitting diode is regarded as an independent path, and the data source on each path The information is modulated by VPPM variable pulse position, and the VPPM variable pulse position modulation mode on each channel is different, so that the signal duty cycle on each channel is also different, so that the output power on each channel can be different. It is not the same. Finally, stable white light is obtained according to the color mixing of RGB. The principle of VPPM-CSK joint modulation is as follows: image 3 shown. Finally, the wireless optical communication modulation method of the present invention is ob...

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Abstract

The invention relates to a wireless optical communication control method of cooperative code modulation type, which adopts the VPPM-CSK code modulation mode, which not only has the lighting function, but also ensures the output of steady white light, and can effectively ensure the output of steady white light. While changing the brightness of white light, realize high-speed communication rate, improve bandwidth utilization and realize efficient, reliable and green communication mode.

Description

technical field [0001] The invention relates to a cooperative coding modulation wireless optical communication control method, which belongs to the technical field of wireless optical communication. Background technique [0002] There have been many research results on wireless optical communication using lighting LEDs. Compared with conventional lighting methods such as fluorescent lamps or incandescent lamps, LED communication has obvious advantages because of its high efficiency, low power consumption, environmental protection, and safety to human eyes. High, low radiation, high confidentiality and other advantages. Therefore, the application of LEDs in display backlight units (BLUs), automotive lights, and interior lighting has attracted great attention. Since LEDs are closely related to our lives, modules that control lighting functions and communication functions are important means for realizing wireless optical communication. [0003] Since the modulation bandwidth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/11H04B10/508H04B10/524
Inventor 洪文昕王浩鉴王炯乾
Owner NANJING UNIV OF POSTS & TELECOMM