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

Visible light communication transmission method for hybrid single-carrier and multi-carrier modulation

A multi-carrier modulation and visible light communication technology, which is applied in the field of wireless optical communication, can solve the problems of low spectrum utilization rate and low code rate, and achieve the effects of improving code rate, high spectral efficiency, and high power efficiency

Active Publication Date: 2019-09-06
JIANGNAN UNIV +3
View PDF4 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low code rate and low spectrum utilization rate in the existing optical communication modulation technology, the present invention provides a visible light communication transmission method with mixed single-carrier and multi-carrier modulation, which effectively improves the spectrum of the system Utilization, with good flexibility and low complexity

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 transmission method for hybrid single-carrier and multi-carrier modulation
  • Visible light communication transmission method for hybrid single-carrier and multi-carrier modulation
  • Visible light communication transmission method for hybrid single-carrier and multi-carrier modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] Such as Figure 1 ~ Figure 4 As shown, the present invention is a visible light communication transmission method mixed with single-carrier and multi-carrier modulation, which includes the following steps.

[0060] S1: Perform QAM modulation on the input signal, perform serial-to-parallel conversion on the mapped data, add conjugate data, and then form a Hermitian symmetric matrix according to the data characteristic requirements, and generate an ACO-OFDM signal matrix X;

[0061] The expression of the ACO-OFDM signal matrix X is as follows:

[0062]

[0063] In the formula:

[0064] x k =a k +ib k ,

[0065] N is the total number of OFDM subcarriers.

[0066] S2: Perform PAM modulation on the input signal, perform serial-to-parallel conversion on the mapped data, add conjugate data, and then form a symmetrical matrix according to the data characteristic requirements to generate a PAM-DMT signal matrix Y;

[0067] The expression of the PAM-DMT signal matrix Y ...

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 provides a visible light communication transmission method based on hybrid single-carrier and multi-carrier modulation, which effectively improves the spectrum utilization rate of a system and has good flexibility and low complexity. The method comprises the following steps: S1, performing QAM modulation on an input signal to generate a symmetrical ACO-OFDM signal matrix; S2, carrying out PAM modulation on the input signal to generate a symmetrical PAM-DMT signal matrix; S3, respectively and sequentially carrying out IFFT of N points, adding cyclic prefixes, carrying out parallel-serial conversion on the data, and adding the two groups of data to form an HACO-OFDM signal after the negative number end of the signal is cut down on the ACO-OFDM signal matrix and the PAM-DMT signal matrix; S4, performing symmetric operation on the OOK data to form symmetric OOK signals; S5, subtracting the time selective bias from the HACO-OFDM signal, and adding a symmetrical OOK signal to finally form a sending signal; and S6, transmitting the sending signal to a channel, demodulating the received signal at a receiver end, and recovering each path of signal.

Description

technical field [0001] The invention relates to the field of wireless optical communication, in particular to a visible light communication transmission method mixed with single carrier and multi-carrier modulation. 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. After the input data is preprocessed, coded and modulated, and digital-to-analog converted, the electrical signal is converted into an optical signal, and the LED is driven by the sending module installed on the LED device, and transmitted to the receiving end by vi...

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 Applications(China)
IPC IPC(8): H04B10/116H04B10/516
CPCH04B10/116H04B10/5161
Inventor 李正权周颖李宝龙薛晓妹吴琼刘洋武贵路
Owner JIANGNAN UNIV
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