Visible light multi-carrier transmission method using multiplicative clipping

A transmission method and visible light technology, applied in the field of wireless optical communication, can solve the problems of overall system performance impact, high PAPR, signal distortion, etc.

Active Publication Date: 2015-07-22
上海瀚芯实业发展合伙企业(有限合伙)
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Binary on-off keying modulation (OOK) is simple to implement but poor in energy efficiency
When the data at the input of the IFFT is in phase, its output will have a large peak value, thus causing an excessive peak-to-average ratio (PAPR)
[0006] Whether it is ACO-OFDM, DCO-OFDM, or PAM-DMT, there is a problem of too high PAPR
Excessive PAPR will not only increase the requirements for the linear range of analog-to-digi

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 multi-carrier transmission method using multiplicative clipping
  • Visible light multi-carrier transmission method using multiplicative clipping
  • Visible light multi-carrier transmission method using multiplicative clipping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033]The present invention will be further described below in conjunction with the accompanying drawings.

[0034] A multiplicative clipping transmission scheme for pulse amplitude-discrete multi-tone modulation (PAM-DMT) visible light multi-carrier communication system: according to the characteristics of the modulation signal of PAM-DMT, the signal amplitude is the same at the symmetrical sampling position of the time domain signal, Signs are reversed. The positive signals in each group of symmetrical time domain signals are reserved, and the negative signals are set to zero. Set the maximum light signal threshold value to η c , when the data bit is greater than η c When , the data bit is multiplied by a given constant α for clipping, and then the symmetrical position signal value is changed from 0 to a fixed signal value flag as a flag bit. This method effectively reduces the peak-to-average ratio (PAPR) of the transmitted optical signal through multiplicative clipping,...

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 multi-carrier transmission method using multiplicative clipping. Positive value signals in each set of symmetrical time domain signals are reserved according to the characteristics of PAM-DMT modulation signals, and zero setting is conducted on negative value signals. The maximum optical signal threshold value is set as eta c, and when the data bit is larger than eta c, clipping is conducted after the data bit is multiplied with a given constant alpha. Then, the signal values at symmetrical positions are changed into preset fixed signal values from 0 so that the symmetrical position can serve as mark bits. A system receiving end determines signal clipping positions and the mark bits through an MAP detection method, signal recovery is conducted according to the multiplicative clipping principle used by a sending end, and therefore the sending signal detection is completed. By means of the method, the PAPR of emitted light signals is effectively reduced through multiplicative clipping, the method is easy to achieve, the system energy utilization rate is increased while the PAPR is restrained, the requirements a system for the linear ranges of power amplifiers and light-emitting diodes, the nonlinear distortion of signals in the electric domain and the light domain is reduced, and the overall performance of the system is improved.

Description

technical field [0001] The invention relates to a visible light multi-carrier transmission method using multiplicative clipping, which belongs to wireless optical communication technology. Background technique [0002] Due to the fact that it is not affected by the growing radio frequency coverage and enjoys a large amount of spectrum resources, visible light communication has attracted extensive attention in the field of next-generation wireless transmission. Since the current optical communication system generally adopts intensity modulation / direct detection (IM / DD), that is, the signal modulates the intensity of light, so it is necessary to ensure that the time domain signal is a positive real number. Binary on-off keying modulation (OOK) is simple to implement, but has poor energy efficiency. In order to improve the data transmission rate and spectrum utilization, and resist multipath fading at the same time, the discrete multi-tone modulation technique (DMT) derived fr...

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): H04B10/116H04B10/556
Inventor 许威徐锦丹张华
Owner 上海瀚芯实业发展合伙企业(有限合伙)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap