Group sparse underwater acoustic channel estimation method in a pulse interference environment

A technology of pulse interference and underwater acoustic channel, which is applied in baseband system components, electrical components, transmission systems, etc., can solve problems such as performance degradation, and achieve the effects of suppressing pulse interference, excellent estimation performance, and strong robustness.

Active Publication Date: 2019-05-28
HARBIN ENG UNIV
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Problems solved by technology

Using the square of the channel estimation error as the cost function in Gaussian noise is the best performance, but in the impulsive interference environment, the performance is seriously degraded

Method used

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  • Group sparse underwater acoustic channel estimation method in a pulse interference environment
  • Group sparse underwater acoustic channel estimation method in a pulse interference environment
  • Group sparse underwater acoustic channel estimation method in a pulse interference environment

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Embodiment Construction

[0026] to combine figure 1 The present invention mainly comprises the steps:

[0027] (1) Define the system cost function in combination with the channel sparsity characteristics and the influence of impulse interference;

[0028] (2) Calculate prior error and gain;

[0029] (3) Update the tap coefficient of the estimator and the regularization parameter representing the sparsity;

[0030] (4) Iterate continuously until the error converges.

[0031] The method for group sparse channel estimation in the present invention will be described in detail below with an example.

[0032] 1. l 1,0 -RLP, l 2,0 -The specific implementation of RLP

[0033] In order to overcome the influence of impulse interference and take advantage of the sparse characteristics of the channel, the cost function is defined as:

[0034]

[0035] In the formula, n is the estimated time, λ is the forgetting factor, is the estimated error at time i, y i is the expected signal at time i, is the e...

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Abstract

The invention provides a group sparse underwater acoustic channel estimation method in a pulse interference environment. (1) defining a new cost function; (2) calculating a prior error and gains; (3)updating an estimator tap coefficient and a regularization parameter for representing the sparsity; and (4) continuously iterating until the error is converged. The method has the advantages that (1)the p norm of the estimation error is taken as a cost function, so that the influence of pulse interference is effectively suppressed, and the robustness is high; (2) the mixed norm is used as sparseconstraint, and the group sparse characteristic of the channel is fully utilized; And (3) the regularization parameters are adaptively updated, the magnitude of applied constraints is continuously adjusted according to the change of the underwater acoustic channel sparsity, and the estimation performance is better.

Description

technical field [0001] The invention relates to an underwater acoustic signal processing method, in particular to a group sparse underwater acoustic channel estimation method based on an RLP algorithm in a pulse interference environment. Background technique [0002] The underwater acoustic signal is seriously damaged during the transmission process. In order to recover the transmitted signal accurately at the receiving end, it is necessary to estimate the channel accurately. Many underwater acoustic channels exhibit obvious group sparse characteristics, which means that the channels are distributed in the form of groups by a small number of non-zero elements in the time domain. In such channels, channel estimation algorithms based on general sparsity have poor estimation performance because they do not make full use of the group sparsity feature. [0003] In the underwater acoustic channel, there are many impulses in the time domain for the noise generated by organisms and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B13/02
Inventor 殷敬伟田亚男韩笑李林葛威刘清宇
Owner HARBIN ENG UNIV
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