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

Signal transmitting and receiving device based on OFDM phase conjugate subcarrier, and method thereof and communication equipment

A signal receiving device and phase conjugation technology, which is applied in the field of communication, can solve the problems that the pilot sequence cannot be synchronized with the carrier frequency, the error frequency offset or phase offset, the system performance is small, and the phase noise cannot be well estimated. Achieve the effect of eliminating carrier frequency synchronization error, extending communication distance and wide application range

Active Publication Date: 2020-07-28
XIDIAN UNIV
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that there is an error between the frequency offset estimated by the pilot sequence that eliminates the inter-subcarrier interference and the frequency offset experienced by each data subcarrier, so that the phase still exists after the final frequency offset compensation Noise impact, system performance improvement is relatively small
[0004] The frequency offset and phase offset estimation method based on the pilot sequence used in the existing optical wireless communication system based on the OFDM modulation format cannot correct the carrier frequency synchronization error, the Doppler frequency shift caused by the mobile environment, and the instantaneous sampling error. Accurately estimate the frequency offset or phase offset of , so that there is a large error between the estimated value and the real value, so its performance improvement is very limited
In addition, the method based on the pilot sequence cannot estimate the phase noise that may exist in wireless optical channels (such as atmospheric turbulence channels, etc.), so its application range is limited

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
  • Signal transmitting and receiving device based on OFDM phase conjugate subcarrier, and method thereof and communication equipment
  • Signal transmitting and receiving device based on OFDM phase conjugate subcarrier, and method thereof and communication equipment
  • Signal transmitting and receiving device based on OFDM phase conjugate subcarrier, and method thereof and communication equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This embodiment provides a signal transmitting device based on OFDM phase-conjugated subcarriers. See figure 1 , figure 1 It is a block diagram of a signal transmitting device based on an OFDM phase-conjugated subcarrier provided by an embodiment of the present invention. The signal transmitting device includes a baseband signal generating module 101 , a baseband signal modulating module 102 and an optical signal transmitting module 103 connected in sequence. The baseband signal generating module 101 is used to obtain two-way first baseband information sequences according to the binary information sequence to be transmitted; the baseband signal modulation module 102 is used to obtain two-way optical signals according to the two-way first baseband information sequences; the optical signal transmitting module 103 is used to transmit the two optical signals.

[0065] Specifically, see figure 2 and Figure 8 , figure 2 is a schematic structural diagram of a baseband...

Embodiment 2

[0073] On the basis of the above embodiments, this embodiment provides a block diagram of a signal receiving device based on OFDM phase-conjugated subcarriers. See Figure 4 , Figure 4 It is a block diagram of a signal receiving device based on an OFDM phase-conjugated subcarrier provided by an embodiment of the present invention. The signal receiving device of this embodiment includes an optical signal receiving module 104, a signal processing module 105, and a signal recovery module 106 connected in sequence, wherein the optical signal receiving module 104 is used to receive two parallel optical signals emitted by the transmitting end; The processing module 105 is configured to obtain two second baseband information sequences according to the two optical signals; the signal recovery module 106 is configured to obtain a final binary information sequence according to the two second baseband information sequences.

[0074] Specifically, see Figure 5 and Figure 11 , Fig...

Embodiment 3

[0098] On the basis of the above embodiments, this embodiment provides a signal transmission method based on OFDM phase-conjugated subcarriers, please refer to Figure 7 , Figure 7 It is a flowchart of a signal transmission method based on OFDM phase-conjugated subcarriers provided by an embodiment of the present invention. As shown, the method includes:

[0099] S1: Obtain two first baseband information sequences according to the binary information sequence to be transmitted;

[0100] S2: Obtain two paths of optical signals according to the two paths of first baseband information sequences;

[0101] S3: Transmit the two optical signals.

[0102] Further, the S1 includes:

[0103] S11: Map the binary information sequence into a symbol sequence;

[0104] Specifically, see Figure 8 , in this embodiment, the binary information sequence first undergoes serial-to-parallel conversion, from serial transmission to parallel transmission, so as to reduce the transmission clock; ...

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 relates to a signal transmitting and receiving device based on OFDM phase conjugate subcarrier and a method thereof and communication equipment, and the device comprises a baseband signal generation module which is used for obtaining two paths of first baseband information sequences according to a to-be-transmitted binary information sequence; a baseband signal modulation module is used for obtaining two paths of optical signals according to the two paths of first baseband information sequences; and an optical signal transmitting module used for transmitting the two paths of optical signals. The signal receiving device comprises an optical signal receiving module used for receiving two paths of parallel optical signals transmitted by a transmitting end; a signal processing module is used for obtaining two paths of second baseband information sequences according to the two paths of optical signals; and a signal recovery module is used for acquiring a final binary information sequence according to the two paths of second baseband information sequences. According to the transmitting device and the receiving device, the phase conjugate subcarriers are introduced into theparallel transmission link, so that various phase noise influences in the transmission process can be effectively eliminated.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a signal transceiving device, method and communication equipment based on OFDM phase-conjugated subcarriers. Background technique [0002] As a new type of communication technology, optical wireless communication has the advantages of both optical fiber communication and mobile communication. It can realize broadband transmission, flexible networking, no need for frequency application, anti-electromagnetic interference, and good confidentiality. With the explosive growth of the amount of data transmitted in modern networks, optical wireless communication systems featuring high bandwidth, high spectral efficiency, and rapid deployment have received extensive attention and research in military, commercial, industrial, and scientific research fields. [0003] At present, most of the traditional optical wireless communication systems are based on OFDM (Orthogonal 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
Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B10/516H04B10/60
CPCH04B10/516H04B10/60H04L27/2626H04L27/2655H04L27/2657H04L27/2691
Inventor 张璐孙帅白杨
Owner XIDIAN 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