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Underwater signal enhancing method based on stochastic resonance and time reverse mirror

A time-reversal mirror and stochastic resonance technology, applied in electrical components, transmission systems, etc., can solve problems such as high signal-to-noise ratio requirements, increasing system design complexity, and affecting communication rates.

Inactive Publication Date: 2017-02-08
XIAMEN UNIV
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  • Application Information

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Problems solved by technology

However, the first two methods will affect the communication rate, and the equalization algorithm has higher requirements on the signal-to-noise ratio, and will increase the complexity of the system design

Method used

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  • Underwater signal enhancing method based on stochastic resonance and time reverse mirror
  • Underwater signal enhancing method based on stochastic resonance and time reverse mirror
  • Underwater signal enhancing method based on stochastic resonance and time reverse mirror

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Embodiment Construction

[0049] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0050] Embodiments of the present invention include the following steps:

[0051] 1) Using a genetic algorithm to obtain a bistable model of stochastic resonance;

[0052] 2) Use the fourth-order Runge-Kutta method to solve the bistable output signal, and obtain the enhanced signal after stochastic resonance;

[0053] 3) Using virtual time reversal mirror technology, by processing the signal after stochastic resonance, the channel impulse response is estimated, and the received information code signal is convolved with the time reversal of the estimated channel, so as to use the The energy further enhances the signal.

[0054] In step 1), the specific steps of obtaining the bistable model of stochastic resonance by using the genetic algorithm are as follows:

[0055] The bimodal model is represented by the nonlinear Langevin equation:

[0056] x(t...

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Abstract

The invention discloses an underwater signal enhancing method based on stochastic resonance and a time reverse mirror, and relates to underwater signal processing. The method comprises the following steps: 1), obtaining a stochastic resonance bistable model through employing a genetic algorithm; 2), employing a fourth-order Ronge-Kutta method to solving a bistable output signal, and obtaining an enhanced signal after stochastic resonance; 3), carrying out the processing of the signal after stochastic resonance through employing the virtual time reverse mirror technology, estimating a channel impulse response, carrying out the time reverse convolution of a received information code signal and an estimation channel, and carrying out the further enhancement of the signal through employing the energy of all paths. The method provided by the invention can be widely used in the field of signal enhancement. The method is higher in enhancement capability for signals which are low in signal to noise ratio and is severely affected by multiple paths.

Description

technical field [0001] The invention relates to underwater signal processing, in particular to an underwater signal enhancement method based on stochastic resonance and a time reversal mirror. Background technique [0002] The underwater acoustic channel is a very complex "time, space and frequency" channel, and the waveform of the signal will be distorted after passing through the underwater acoustic channel. The characteristics of high environmental noise, narrow bandwidth, few applicable carrier frequencies, and large transmission delay make underwater acoustic communication one of the most challenging research topics in modern communication technology. How to accurately detect target signals and how to carry out long-distance transmission is one of the most common problems in underwater acoustic communication technology. Since the underwater acoustic detection signal is affected by various sound absorptions, the energy of the detection signal is attenuated. At the same...

Claims

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Application Information

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IPC IPC(8): H04B1/711H04B13/02
CPCH04B1/711H04B13/02
Inventor 程恩钟张婷袁飞陈柯宇朱逸
Owner XIAMEN UNIV
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