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LED polarization array visible light transmission system

An LED array and transmission system technology, applied in transmission systems, electromagnetic wave transmission systems, short-range systems, etc., can solve the problems of lack of frequency and phase information, LED sub-channel interference, large inter-code crosstalk, etc.

Inactive Publication Date: 2021-03-09
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since visible light communication uses intensity modulation and direct detection, and lacks frequency and phase information, the interference between different LED sub-channels is serious, and there is a large intersymbol crosstalk, which seriously affects the communication performance of the system.

Method used

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  • LED polarization array visible light transmission system
  • LED polarization array visible light transmission system
  • LED polarization array visible light transmission system

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] Such as figure 1 As shown, the emitting end of the present invention is a 4×4 LED array.

[0026] The transmitter uses an LED lighting source composed of 16 LED chips. This kind of LED light source that meets the requirements has been widely used in indoor lighting systems. Each LED light source of the LED array used is a white LED, and the unit size is x×y, taking 3mm×3mm as an example, the -3dB photoelectric modulation bandwidth is about 20MHz, which can realize high-speed visible light communication in indoor lighting scenarios.

[0027] At the transmitting end, the distance between the centers of adjacent LED chips is several times the unit size, taking 9mm as an example.

[0028] At the transmitting end, there is a filter in front of each LED for light filtering, which filters the light emitted by the LED into monochromatic light.

[0029] At the transmittin...

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Abstract

The invention discloses an LED polarization array visible light transmission system. An LED array composed of m*n LED chips is used as a transmitting end, and by taking 4*4 as an example, an LED arraytransmitting system which does not interfere with one another is formed by independently driving each LED chip. Light emitted by each LED light source is changed into monochromatic linearly polarizedlight through the filter and the polaroid, and the polarization directions of the adjacent polarized light are perpendicular to each other. The APD array of the receiving end is the same as the transmitting end, and the polarization direction of the corresponding APD front polaroid is the same as that of the transmitting end. Both the transmitting end and the receiving end are provided with optical lenses which can be used for collimation and focusing. The polarization array visible light communication system provided by the invention can effectively control intersymbol interference between different channels, can perform parallel communication, multiplies the capacity and spectrum utilization efficiency of the system under the condition of not increasing the bandwidth, has high communication rate and low bit error rate performance in an indoor lighting scene, and has very strong practicability.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an LED polarization array visible light transmission system. Background technique [0002] Visible light communication technology is a wireless communication technology that uses the visible light band as an optical carrier to communicate. Compared with traditional radio communication, visible light communication technology has the characteristics of high efficiency, no electromagnetic interference, and environmental protection. At the same time, it also has more abundant Spectrum resources, higher confidentiality and license-free advantages. [0003] Indoor visible light communication research is dedicated to combining high-speed wireless data transmission with common indoor lighting. In order to provide sufficient light intensity, most of the existing indoor LED lighting sources are composed of multiple LED chips. By independently modulating and driv...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/50H04B10/61
CPCH04B10/116H04B10/502H04B10/6151
Inventor 李军罗江华李林
Owner YANGTZE UNIVERSITY