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Joint Suppression Method of Impulse Noise and Doppler Frequency Offset in Underwater Acoustic Communication System

A Doppler frequency offset and underwater acoustic communication technology, which is applied in the field of joint suppression of impulse noise and Doppler frequency offset, can solve the problems of unsatisfactory suppression performance and large amount of calculation, and achieve the improvement of signal-to-noise ratio and robustness performance-enhancing effects

Active Publication Date: 2021-11-30
宁波市大学科技园发展有限公司
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Problems solved by technology

[0004] "Carrier frequency offset and impulse noise estimation for underwateracoustic orthogonal frequency division multiplexing" (underwater acoustic orthogonal frequency division multiplexing carrier frequency offset and impulse noise estimation) proposed to use OMP (orthogonal matching pursuit) algorithm and empty subcarrier energy The minimization method is used to jointly estimate impulse noise and Doppler frequency offset, but this method needs to search for values ​​within the frequency offset range and perform impulse noise estimation, which requires a large amount of calculation, and the suppression performance is not ideal

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  • Joint Suppression Method of Impulse Noise and Doppler Frequency Offset in Underwater Acoustic Communication System
  • Joint Suppression Method of Impulse Noise and Doppler Frequency Offset in Underwater Acoustic Communication System
  • Joint Suppression Method of Impulse Noise and Doppler Frequency Offset in Underwater Acoustic Communication System

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[0027]The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] A joint suppression method of impulse noise and Doppler frequency offset in an underwater acoustic communication system proposed by the present invention, its overall realization block diagram is as follows figure 1 As shown, it includes the following steps:

[0029] Step 1: At the sending end of the OFDM-based underwater acoustic communication system, the original binary data is interleaved and transformed, and a matrix of M rows and J columns is obtained after the interleaved transformation; then, the matrix obtained after the interleaved transformation is modulated to obtain a binary Send data; then send the binary data to the receiving end of the OFDM-based underwater acoustic communication system through the underwater acoustic channel; where the length of the original binary data is N, N represents the number of OFDM subcarriers, N...

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Abstract

The invention discloses a joint suppression method of pulse noise and Doppler frequency offset in an underwater acoustic communication system, which obtains binary transmission data after interleaving transformation and modulation processing of the original binary data at the sending end; The signal is converted into an OFDM frequency domain signal, and the phase information of the OFDM frequency domain signal is extracted; the time domain impulse noise signal and Doppler frequency offset are jointly suppressed based on subspace; the suppressed frequency domain signal is demodulated The estimated signal in the time domain is obtained by processing and deinterleaving transformation; the advantage is that it can jointly suppress impulse noise and Doppler frequency offset, and the suppression effect is good.

Description

technical field [0001] The invention relates to a method for suppressing interference in an underwater acoustic communication system, in particular to a method for jointly suppressing pulse noise and Doppler frequency offset in an underwater acoustic communication system. Background technique [0002] With the development and utilization of the near-coast by humans, the new generation of underwater acoustic communication systems can be flexibly used in scenarios such as different rate loads, coverage distances, water depths, network structures, and ocean environment observations, which will also be indispensable in the future. A communication technology. However, the wide application of underwater acoustic communication is subject to many restrictions. Among them, the existence of Doppler frequency shift in underwater acoustic channel and the abundant impulse noise in underwater acoustic channel are the main factors restricting the performance of underwater acoustic communic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B13/02
CPCH04B13/02H04L27/2657H04L27/2695H04L2027/0026
Inventor 李有明曾宇恩卢志刚王沛鑫
Owner 宁波市大学科技园发展有限公司
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