Indoor visible light positioning and information push method based on frequency-shift keying

Abstract

The invention relates to an indoor visible light positioning and information push method based on frequency-shift keying, and belongs to the technical field of visible light communication. The method comprises the steps: modulating a signal comprising a data frame head, position information (ID) and data information through frequency-shift keying, and transmitting the signal through an LED; distinguishing different LEDs and the intensities of the LEDs at a receiving end through employing fast Fourier transform, obtaining the contents, transmitted by the LEDs, through inverse Fourier transform and a null point detection method, and obtaining the position information and the transmitted contents. The method is simple and practicable, is convenient to achieve, and can neglect the impact from background noises. Compared with a positioning method for transmitting the signal synchronously through the LEDs, the method reduces background redundancy, greatly improves the expansibility, and can eliminate the position error caused by background light.

Description

technical field [0001] The invention relates to an indoor visible light positioning and information pushing method based on frequency shift keying, and belongs to the technical field of visible light communication. Background technique [0002] The indoor positioning solution based on visible light communication (VisibleLightCommunication, VLC) technology uses white light emitted by white semiconductor light-emitting diodes (LightEmittingDiode, LED) as the carrier of positioning signals, so there is no electromagnetic radiation and is not limited by the application environment; and the transmission channel of VLC Generally, a direct channel is used, and the multipath interference is relatively small, so the positioning scheme can achieve relatively high accuracy; in addition, the indoor positioning system based on VLC technology is compatible with the future VLC communication technology, so it does not require expensive hardware equipment investment, cost relatively low. In...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a method for realizing indoor visible light positioning and information push by frequency shift keying for the problems of poor scalability of synchronous signal positioning and complex equipment in the indoor visible light positioning and information push method based on time division multiplexing. LED does not need to be synchronized to realize positioning and complete information push

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