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
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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 bou...

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  • 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

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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...

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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 ...

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Application Information

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IPC IPC(8): H04L25/03H04L1/00H04L1/18
CPCH04L25/03949H04L25/03006H04L1/0057H04L1/1812H04L1/0061
Inventor 吴倩倩刘锋
Owner SHANGHAI MARITIME UNIVERSITY
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