Unlock instant, AI-driven research and patent intelligence for your innovation.

A Hybrid Visible Light Modulation Method Compatible with Dimming Control

A modulation method and dimming control technology, which can be used in short-distance systems, electrical components, electromagnetic wave transmission systems, etc., and can solve problems such as data communication and brightness adjustment cannot be satisfied at the same time

Active Publication Date: 2021-08-24
JIANGNAN UNIV
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modulation techniques in the prior art, such as pulse modulation and orthogonal frequency division multiplexing, cannot meet the two requirements of data communication and brightness adjustment at the same time.

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
  • A Hybrid Visible Light Modulation Method Compatible with Dimming Control
  • A Hybrid Visible Light Modulation Method Compatible with Dimming Control
  • A Hybrid Visible Light Modulation Method Compatible with Dimming Control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0065] In order to support the dual functions of communication and dimming control, various dimming compatible modulation schemes have been developed in the industry; standard modulation schemes are defined in IEEE802.15.7, among which VOOK (variable on–offkeying) technology and VPPM ( Variable pulse position modulation (variable pulse position modulation) technology can meet high-quality lighting conditions while ensuring a reliable bandwidth communication link.

[0066] VOOK technology is composed of OOK and PWM dimming technology. It is divided into two parts: active part and invalid part. The active part is used for data transmission, and the inactive part is filled with 1 or 0 according to dimming; VOOK modulator sends continuous rectangular pulses, "1" is represented by intensity, and "0" is represented by no pulse; VPPM technology is a modulation method in which the pulse position changes according to the change of the modulated signal, that is, the pulse waves at differ...

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 present invention provides a hybrid visible light modulation method compatible with dimming control, which supports high-speed visible light communication and can meet users' requirements for brightness adjustment of lighting sources. It includes the following steps: S1: Modulate the OFDM signal data into a frequency band signal, construct the frequency band signal to satisfy a symmetric matrix, then perform IFFT transformation to obtain a corresponding time domain signal, and add a cyclic prefix CP to the transformed matrix , to obtain the final OFDM signal matrix; S2: Obtain the brightness control sequence of the light-emitting device; S3: Preprocess the OFDM signal matrix; S4: Superimpose the brightness control sequence and the preprocessed OFDM signal matrix to obtain The driving signal of the light-emitting device; S5: the driving signal is sent to the light-emitting device; S6: the light-emitting device performs demodulation after receiving the driving signal, and completes the two tasks of sending communication data and adjusting the brightness of the light-emitting device itself Function.

Description

technical field [0001] The invention relates to the technical field of visible light communication modulation, in particular to a hybrid visible light modulation method compatible with dimming control. Background technique [0002] Visible light communication technology is a communication technology that uses high-speed bright and dark flashing signals invisible to the naked eye emitted by fluorescent lamps, light-emitting diodes and other light sources to transmit information. Connect the Internet signal transceiver device to the lighting device to form a network system that can cover the reach of indoor lighting. figure 1 It is the basic schematic diagram of the visible light communication system. The input data is preprocessed, coded and modulated, and digital-to-analog converted to drive the LED. The electrical signal is converted into an optical signal. After transmission reaches the receiving end, it is converted into an electrical signal by a photodetector (PD). , af...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B10/516
CPCH04B10/116H04B10/516
Inventor 李正权薛晓妹李宝龙周颖吴琼刘洋武贵路
Owner JIANGNAN UNIV