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

Reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control

A dimming control and multi-pulse technology, which is applied in the field of wireless optical communication, can solve the problems of inability to carry information and large system complexity, achieve high spectral efficiency and improve the data transmission rate.

Active Publication Date: 2018-08-03
SYSU CMU SHUNDE INT JOINT RES INST +1
View PDF3 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PWM used for dimming in this method does not carry information
In the prior art, an asymmetric hybrid optical OFDM (Asymmetric Hybrid Optical OFDM, AHO-OFDM) method is also proposed. Although it can provide relatively high spectral efficiency, the system complexity is relatively large, and it does not use digital Dimming Technology

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
  • Reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control
  • Reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control
  • Reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a reverse polarity multi-pulse position modulated optical OFDM system combined with dimming control includes a transmitter and a receiver, the transmitter and the receiver are connected through a VLC optical channel, and the transmitter includes sequentially connected data distribution device, an optical OFDM modulator, a first polarity inverter, a truncation device, a digital-to-analog converter, and an LED, and the data distributor is also connected to the first polarity inverter via an MPPM mode selector; the receiver comprising a photodetector connected in sequence, an analog-to-digital converter, a second polarity inverter, an optical OFDM demodulator and a data combiner, the analog-to-digital converter is also connected to the data combiner via an MPPM demodulator, The MPPM demodulator is also connected with the second polarity inverter; the optical signal of the LED is transmitted to the photodiode through the VLC optical channel.

[0...

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 reversed polarity multiple pulse position modulation optical OFDM system combining with dimming control. The system combines MPPM and RPO-OFDM technologies efficiently, and improves the data transmission rate under the precondition of keeping a bandwidth unchanged by utilizing an extra-bit carried by an MPPM mode while supporting a flexible dimming function. Compared withthe traditional RPO-OFDM, the method can realize higher spectrum efficiency under the condition that calculation complexity and energy consumption are similar to those in the prior art.

Description

technical field [0001] The present invention relates to the field of wireless optical communication, more specifically, relates to a reverse polarity multi-pulse position modulated optical OFDM system combined with dimming control. Background technique [0002] In the 21st century, the demand for wireless data transmission rate is increasing exponentially. Although current cellular network standards are still evolving, the demand for mobile data traffic will most likely exceed what traditional spectrum can support. The emergence of visible light communication (Visible Light Communication, VLC) can just solve the problem of increasingly tight spectrum resources. The basic device of VLC is Light Emitting Diode (LED), which is widely used in lighting. VLC has many advantages, including no need for spectrum authorization, no radio frequency interference, and no radiation. [0003] As a key technology in the Long-Term Evolution (LTE) system, Orthogonal Frequency Division Multi...

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): H04L27/26H04B10/69H04B10/524H04B10/116
CPCH04B10/116H04B10/524H04B10/691H04L27/2601H04L27/2627H04L27/2649
Inventor 江明杨子贤张琳
Owner SYSU CMU SHUNDE INT JOINT RES INST
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