Wavelet packet noise reduction method for meteor trail communication system

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...

AI Technical Summary

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 background noise, because it is a broadband process, it is approximately irrelevant, and its current value cannot It is estimated that, for a long time, in the meteor trail communication system, there is no good way to suppress the background noise

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