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MFSK signal modulation identification method under Alpha stable distribution noise

A technology of signal modulation and stable distribution, applied in modulation type identification, modulation carrier system, FM carrier system, etc., to achieve the effect of good robustness, good recognition effect, and good recognition performance

Active Publication Date: 2018-02-13
北京云智慧未来科技有限公司
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for identifying MFSK signal modulation in an Alpha stable distributed noise environment, so as to solve the problem of signal identification in application fields such as communication signal monitoring in environments with impulse noise such as short-wave communication and shallow sea acoustic communication. question

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  • MFSK signal modulation identification method under Alpha stable distribution noise
  • MFSK signal modulation identification method under Alpha stable distribution noise
  • MFSK signal modulation identification method under Alpha stable distribution noise

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[0028] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, the MFSK signal modulation identification method under the Alpha stable distributed noise provided by the embodiment of the present invention includes the following steps:

[0031] S101: First, perform a time-frequency analysis of the received MFSK signal on a generalized short-time Fourier transform (GSTFT) to obtain a time-frequency analysis image of the received signal;

[0032] S102: Then extract the frequency hopping feature sequence of the gene...

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Abstract

The invention belongs to the technical field of communication signal modulation analysis under a non-Gaussian noise environment and discloses an MFSK signal modulation identification method under Alpha stable distribution noise. Generalized short-time Fourier transform is carried out on a received MFSK signal, thereby obtaining a time-frequency analysis image of the MFSK signal; a frequency hop feature sequence in the time-frequency analysis image obtained through the generalized short-time Fourier transform is extracted; and clustering analysis is carried out on the frequency hop feature sequence through adoption of a blind clustering method, thereby finishing identifying a modulation type of the MFSK signal. For the MFSK signal, under an Alpha stable distribution noise environment, whena mixed signal to noise ratio is greater than 0dB, an identification rate reaches more than 94%, and visibly, the modulation identification effect of the method is relatively good.

Description

technical field [0001] The invention belongs to the technical field of communication signal modulation analysis in a non-Gaussian noise environment, and in particular relates to an MFSK signal modulation identification method in an Alpha stable distributed noise environment. Background technique [0002] Multi-ary Frequency Shift Keying (MFSK) signals are widely used in communication systems because of their better anti-interference performance. In non-cooperative third-party receiving applications such as communication countermeasures and radio monitoring, it is necessary to automatically identify the modulation mode of the received signal before demodulation and interpretation of the signal can be realized. [0003] At present, many achievements have been made in the research on the modulation recognition of Frequency Shift Keying (FSK) signal in Gaussian noise environment. The methods of MFSK signal modulation recognition can be roughly divided into methods based on Four...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/10H04L27/00
CPCH04L27/0012H04L27/106
Inventor 刘明骞张俊林
Owner 北京云智慧未来科技有限公司
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