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

Underwater acoustic communication method using polarization code and equalizer

A technology of underwater acoustic communication and equalizer, which is applied in error prevention/detection using return channel, shaping network in transmitter/receiver, baseband system, etc. Suitable for practical use and other issues, to achieve the effect of simple coding structure

Inactive Publication Date: 2021-10-22
SHANGHAI MARITIME UNIVERSITY
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Monte Carlo method estimates the reliability of sub-channels through multiple experiments, which is suitable for various channels, but the complexity of the method is very high and it is not suitable for practical use
The Bhb parameter boundary method needs to know the characteristic parameters of the underwater acoustic channel to calculate the initial value of the Bhb parameter. This method needs to calculate and feed back the channel state information, and the accuracy is not high

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
  • Underwater acoustic communication method using polarization code and equalizer
  • Underwater acoustic communication method using polarization code and equalizer
  • Underwater acoustic communication method using polarization code and equalizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] The present invention proposes an underwater communication method using polar codes and equalizers, the implementation process is as follows figure 1 As shown, the training data is used to update the equalizer coefficients, and the underwater acoustic channel is regarded as a Gaussian channel through the equalizer; the receiving end uses the equalized output to calculate and feed back the noise variance; the receiving end uses the Gaussian approximation method to construct a polar code according to the feedback information; the receiving end Use the CA-SCL decoding method to decode; pass the decoding result through the cyclic redundancy check; judge whether to retransmit according to the CRC check result to reduce the impact of the feedback error.

[0050] Specifically, the present invention realizes the above method through the following steps:

[0051] S1. Use an equalizer to equalize the underwater acoustic channel;

[0052] S2. The receiver calculates and feeds bac...

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 an underwater acoustic communication method using a polarization code and an equalizer. An underwater acoustic channel is converted into a Gaussian channel through the equalizer to construct the polarization code, and an HARQ mechanism is added to improve the performance of the scheme. According to the scheme, the bit error rate performance is superior to the result of turbo equalization iteration for five times, the decoding complexity is low, the coding structure is simple, and only noise variance information needs to be fed back when a polarization code receiving end is constructed by using a Gaussian approximation method.

Description

technical field [0001] The present invention relates to an underwater communication method using a polar code and an equalizer, more specifically, relates to the use of an adaptive decision feedback equalizer based on the minimum bit error rate criterion, the encoding and decoding of a polar code, and the use of a HARQ mechanism to improve the system performance. Background technique [0002] Adaptive decision feedback equalization technology can automatically track the change of channel characteristics, avoid the complicated process of channel estimation and then matrix inversion, and is suitable for underwater acoustic channels with long storage length. Combining the adaptive decision feedback equalizer based on the minimum symbol error rate criterion with the Turbo receiver for iterative decoding can effectively improve the system performance, but the more iterations, the higher the decoding complexity of the method. [0003] Polar codes are the first channel codes that ...

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): H04L25/03H04L1/00H04L1/18
CPCH04L25/03949H04L25/03006H04L1/0057H04L1/1812H04L1/0061
Inventor 吴倩倩刘锋
Owner SHANGHAI MARITIME UNIVERSITY
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