Spectrum signal recognition method and a system based on Fourier series fitting denoising

Abstract

The invention discloses a spectrum signal identification method based on Fourier series fitting denoising. The method comprises the following steps: (1) removing the corresponding signal whose spectrum power value in the original signal spectrum diagram exceeds a set threshold value, and recording the sequence value of the signal corresponding to the baseband part of the signal and the intensity value corresponding to the signal; (2) using the signal corresponding to the baseband part of the signal as a fitting point, and obtaining the fitting curve by fitting the signal with the seventh-orderFourier series; (3) obtaining the fitting curve corresponding value by using the sequence value of the signal points corresponding to the baseband part of each signal, subtracting the fitting curve corresponding value from the signal strength value corresponding to the original signal, and obtaining the signal after correcting the baseline drift and the corresponding spectrum map; (4) using the energy detection method to identify the signal after the correction of baseline drift, and obtainingthe spectrum signal usage table is obtained. It can accurately identify the use of spectrum, high accuracy and low computational complexity.

Description

technical field [0001] The invention relates to a spectrum signal identification method and system, in particular to a spectrum signal identification method and system based on Fourier series fitting and denoising. Background technique [0002] Communication plays an increasingly important role in modern society, and spectrum resources are the basic resources of communication. Nowadays, the use of spectrum resources adopts the method of authorization before use. In the case of overall resource scarcity, there is a problem that the utilization of authorized spectrum is not high, and a large number of spectrum holes are detected in the actual spectrum usage. Cognitive radio technology is a technology that rationally utilizes unused spectrum resources without causing interference to authorized users. The invention belongs to the field of spectrum perception of cognitive radio, and is used for identifying the specific use of spectrum in the monitored spectrum signal sequence. ...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to overcome the deficiencies of the prior art, the present invention provides a spectral signal identification method and system based on Fourier series fitting and denoising, which can solve the problems of low noise identification efficiency, poor effect and complex calculation of identification

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