Wavelet packet noise reduction method for meteor trail communication system

A meteor trail communication and wavelet packet technology, applied in the transmission system, electrical components, etc., can solve the problems that the current value cannot be estimated, and there is no good method for background noise suppression, so as to improve the communication performance of the meteor trail and shorten the communication time. Waiting time, solving the effect of large background noise

Inactive Publication Date: 2018-08-28
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

In general, for interference signals, through the research of interference suppression technology, local interference cancellation, out-of-band interference suppression and in-band interference reduction can be realized, while for backgroun

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  • Wavelet packet noise reduction method for meteor trail communication system
  • Wavelet packet noise reduction method for meteor trail communication system
  • Wavelet packet noise reduction method for meteor trail communication system

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Embodiment Construction

[0027] A wavelet packet noise reduction method for meteor trail communication system, specifically including the following steps:

[0028] (1) Digitization of the received signal: After the signal received by the antenna is amplified, filtered, frequency-converted and automatic gain control by the low-noise amplifier and receiver, an analog low-IF signal is obtained, and then the digital received signal is obtained after AD sampling;

[0029] (2) Wavelet packet decomposition of the signal: select a wavelet base and determine the level of decomposition required, and perform wavelet packet decomposition on the signal. The specific steps are:

[0030] (201) Select the wavelet basis function: For the MPSK complex signal of the meteor trail communication system, select the "rbio6.8" wavelet basis in the ReverseBiorthogonal wavelet system, which has the best denoising effect. The wavelet packet decomposition algorithm uses Mallat multi-resolution analysis The orthogonal wavelet decomposit...

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Abstract

The invention discloses a wavelet packet noise reduction method for a meteor trail communication system, used for performing noise reduction on meteor trail communication signals. The method comprisesthe following steps of: selecting a proper wavelet basis function, performing wavelet decomposition on the signals by using an orthogonal wavelet decomposition algorithm, performing threshold quantization on the wavelet decomposition coefficients by using soft threshold functions, performing signal reconstruction by using a reconstructed function with a specific structure, and realizing the feature extraction of weak signals in the background of strong noise. The method disclosed by the invention is capable of obviously improving demodulation signal-to-noise ratio of the meteor trail communication system, enhancing the detection and utilization abilities for the weak signals, shortening the communication waiting time and improving the information transmission capacity, and is especially suitable for application scenarios in which the meteor trail communication signals are drown by strong background noise.

Description

Technical field [0001] The invention relates to a wavelet packet noise reduction method used in a meteor trail communication system in the field of wireless communication, and is particularly suitable for applications in the complex electromagnetic environment of meteor trail communications, extracts weak signals from strong background noise, and improves demodulation The signal-to-noise ratio improves the performance of the communication system. Background technique [0002] In the meteor trail communication system, the received signal includes meteor trail communication signals, interference signals, and receiver background noise. It is necessary to suppress background noise and interference signals as much as possible to recover useful communication signals. [0003] Meteor trail communication interference signals include local high-power transmission signals, external environment out-of-band interference and in-band interference signals, and receiver background noise includes a...

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Application Information

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IPC IPC(8): H04B1/10
CPCH04B1/10
Inventor 李弋鹏李飞高承志陈宝文王伟
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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