Method for improving high-order cumulant based signal identification under multipath Rayleigh fading channel

Abstract

An embodiment of the invention discloses a method for improving high-order cumulant based signal identification under a multipath Rayleigh fading channel. The method comprises steps as follows: a received signal under the multipath Rayleigh fading channel is acquired and subjected to discretization treatment, and a time domain signal formed by a multipath channel factor sequence, an original signal sequence and a Gaussian white noise sequence which change with signal length is obtained; the time domain signal is subjected to discrete Fourier transformation to form a frequency domain signal, and after equilibrium coefficient based equilibrium processing, a time domain signal formed by a restoring signal sequence and a residual noise sequence is obtained through inverse transformation of the discrete Fourier transformation; fourth-order cumulant and second-order cumulant of the restoring signal sequence are solved respectively, a characteristic parameter is obtained according to obtained solving values, and further, a current signal type of the received signal is determined according to the characteristic parameter. According to the embodiment, the problems that an existing high-order cumulant based signal identification method fails under the multipath Rayleigh fading channel and is not beneficial to actual application are solved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for improving high-order cumulant signal identification under multipath Rayleigh fading channels. Background technique [0002] The signal recognition method based on high-order cumulants is an important feature extraction method, and the method based on feature extraction is relatively low in computational complexity and requires less prior information. In addition, the extracted features are accurate and reasonable. When , the correct recognition rate of the signal is also high. Therefore, in recent years, the signal recognition technology based on high-order cumulants has been widely used in the field of signal recognition because of its simple calculation and strong anti-interference ability to Gaussian noise. [0003] However, in practical applications, communication signals often experience multipath fading during transmission, and traditional signal identi...

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a method for improving high-order cumulant signal identification in a multipath Rayleigh fading channel, which overcomes the failure of the existing high-order cumulant-based signal identification method in a multipath Rayleigh fading channel. Facilitate application to practical problems

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