Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Visible light communication positioning method based on CDMA modulation and positioning system adopted by same

A technology of visible light communication and positioning method, which is applied in the field of visible light communication positioning, and can solve problems such as limiting positioning accuracy and inter-symbol interference

Inactive Publication Date: 2016-08-17
SOUTH CHINA UNIV OF TECH
View PDF3 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of multiple reference points in the positioning system, the ID positioning information transmitted by different sources will cause intersymbol interference due to the existence of multipath effects, which greatly limits the positioning accuracy.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Visible light communication positioning method based on CDMA modulation and positioning system adopted by same
  • Visible light communication positioning method based on CDMA modulation and positioning system adopted by same
  • Visible light communication positioning method based on CDMA modulation and positioning system adopted by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 As shown, a system model of a VLC positioning algorithm based on CDMA modulation. Arrange m LED lamps according to the requirements of the indoor environment, where m is a positive integer, and m≥4; take every 4 LED lamps as a location unit for positioning. On the ground, three identical photodiodes form an equilateral triangle with a side length of 0.01m to form a photodetection device.

[0047] Such as figure 2 As shown, the original ID information forms a baseband modulation signal after passing through the OOK baseband modulation module; the baseband modulation signal forms a spread spectrum signal after passing through the CDMA spread spectrum module; the spread spectrum signal drives the LED lamp to emit visible light ID through the LED drive circuit signal; the visible light ID signal reaches the photoelectric detection device through free space; the photoelectric detection device converts the visible light ID signal into an electrical signal;...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a visible light communication positioning method based on CDMA modulation. The visible light communication positioning method includes the following steps that 1, a baseband modulation signal with the bandwidth B1 is formed; 2, a spread spectrum signal with the bandwidth B2 is formed; 3, an LED driver circuit drives an LED lamp to send out a visible light signal according to the spread spectrum signal; 4, ID information is obtained; 5, positioned position coordinates are finally obtained according to the ID information and combining with an RSS triangle localization algorithm. The invention further discloses a positioning system adopted by the visible light communication positioning method based on CDMA modulation. The positioning system comprises a transmitting subsystem, a transmission subsystem and a receiving subsystem. The positioning accuracy is not only improved greatly, the system is simple and does not need synchronized transmission, and the performance of the system is greatly improved. The visible light communication positioning method and the positioning system have the advantages of being wide in application prospect and the like.

Description

technical field [0001] The present invention relates to visible light communication positioning technology, in particular to a visible light communication positioning algorithm based on CDMA modulation. Background technique [0002] Global Positioning System (Global Positioning System, GPS) is a good navigation system for outdoor applications, and has a wide range of applications in industries such as mobile phone map services, car navigation, ships and aircraft. At present, GPS outdoor positioning technology is very mature and widely used in various fields, which greatly stimulates the development and research of indoor positioning technology. In recent years, indoor positioning technology has attracted more and more attention, such as product positioning detection in large warehouses, navigation services inside large buildings (museums, shopping malls, parking lots), etc. However, in buildings, densely populated cities, under bridges, underground and other environments, d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04B10/116H04B10/556H04B1/7107H04B1/711H04J11/00H04W64/00
CPCH04B1/7107H04B1/711H04B10/116H04B10/556H04J11/0063H04W64/006
Inventor 吴玉香关伟鹏陈颖聪文尚胜
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com