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CDMA coding method based on visible light indoor location

An indoor positioning and coding method technology, applied in the field of visible light communication positioning, can solve problems such as intersymbol interference and limit positioning accuracy, and achieve the effects of improving accuracy, increasing capacity, and improving communication quality

Active Publication Date: 2016-11-16
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] In the visible light indoor positioning system, at least the positions of three reference nodes need to be known, and the ID positioning information sent by different reference point sources generally overlap in the time domain and frequency domain, and codes will be generated due to the existence of multipath effects. Interference, which greatly limits the accuracy of positioning

Method used

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  • CDMA coding method based on visible light indoor location
  • CDMA coding method based on visible light indoor location
  • CDMA coding method based on visible light indoor location

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0029] Such as figure 1 A visible light indoor positioning system is shown, including an LED transmitting subsystem, a channel transmission subsystem and a signal receiving subsystem. Wherein the LED transmitting subsystem has: OOK baseband modulation module, CDMA spread spectrum modulation module, LED drive circuit and LED lamps connected sequentially; the channel transmission subsystem is a free space for indoor optical signal transmission; the signal receiving subsystem It has: a photoelectric detection device, a signal amplifying circuit, an adaptive filtering circuit and a CDMA despreading module connected in sequence. The original ID information forms a baseband modulation signal after passing through the OOK baseband modulation module; the baseband modulation sig...

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Abstract

The invention discloses a CDMA coding method based on visible light indoor location. According to the method, multiple LEDs are arranged in a visible light indoor location system, intersymbol interference will be caused among the LEDs, and the location precision is seriously influenced. According to direct sequence code division multiple access modulation, signals which are overlapped both in a time domain and a frequency domain are separated by employing orthogonality of spread spectrum codes, further code division multiplexing can be realized, and the problem of intersymbol interference due to existence of multiple reference points in the VLC (Visible Light Communication) location system is solved. Compared with a traditional visible light communication location technology, the method has the advantages that the location precision is greatly improved, the system is simple, synchronous transmission is unnecessary, and the system performance is greatly improved. The method has wide application prospect.

Description

technical field [0001] The present invention relates to visible light communication positioning technology, in particular to a CDMA coding method. Background technique [0002] Visible Light Communication technology (Visible Light Communication, VLC) refers to the use of light in the visible light band as an information carrier, without the need for transmission media such as optical fibers, and directly transmits optical signals in the air. The application of visible light communication technology in indoor positioning technology has many advantages compared with traditional indoor positioning technology, such as high positioning accuracy, no electromagnetic interference, less additional modules, good confidentiality, and consideration of communication and lighting, etc., which has attracted many international attention. The attention of experts and scholars. [0003] In the visible light indoor positioning system, at least the positions of three reference nodes need to be...

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Application Information

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IPC IPC(8): H04B1/707H04B10/116G01S5/16
Inventor 文尚胜王晓杰关伟鹏张钊泽陈昊
Owner SOUTH CHINA UNIV OF TECH
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