A Modulation Recognition Method and Device Based on Envelope Square Spectrum Analysis
A technology of modulation recognition and square spectrum, which is applied in the field of communication, can solve problems such as the decline of recognition rate and stability, and achieve the effects of improving stability, enhancing robustness, and good anti-interference ability
Active Publication Date: 2019-12-03
INST OF INFORMATION ENG CHINESE ACAD OF SCI
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[0005] In view of the defects in the prior art, the present invention provides a modulation recognition method and device based on envelope square spectrum analysis, which is used to overcome the decrease in stability when there is interference such as intersymbol interference, carrier frequency and phase deviation in non-cooperative communication , The problem of the decline of the recognition rate, in order to improve the anti-interference ability of the recognition method
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[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0059] In the first aspect, the embodiment of the present invention provides a modulation recognition method based on envelope square spectrum analysis, such as figure 1 shown, including:
[0060] S1. Oversampling, normalizing and zero-meaning the received signal to be identified to obtain a preprocessed signal;
[0061] S2. Obtain the envelope ...
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The invention relates to a modulation identification method and device based on envelope square spectrum analysis. The method comprises the following steps of: performing over-sampling, normalization and zero equalization of a received signal to be identified so as to obtain a pre-processed signal; obtaining an envelope square spectrum and an identification feature of the pre-processed signal; and comparing the identification feature with a judgment threshold so as to identify the modulation manner of the signal to be identified. The device provided by the invention is realized based on the modulation identification method. By means of the modulation identification method and device disclosed by the invention, the identification stability can be improved; and the anti-interference capability is better.
Description
technical field [0001] The invention relates to communication technology, in particular to a modulation recognition method and device based on envelope square spectrum analysis. Background technique [0002] As an intermediate step between signal detection and signal demodulation, modulation recognition plays an important role in both military and civilian communications. At present, modulation recognition methods are mainly divided into two categories: likelihood function-based recognition methods and feature extraction-based recognition methods. The identification method based on the likelihood function regards the modulation identification as a compound hypothesis testing problem. The feature quantity used for classification is obtained by processing the likelihood function of the signal, and then input into the classifier for comparison to complete the modulation identification function. In the sense of Yeesian estimation, the optimal classification effect can be obtain...
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IPC IPC(8): H04L25/03H04L27/00H04L27/26
CPCH04L25/03006H04L25/03834H04L27/0012H04L27/2614H04L27/2628
Inventor 李敏梁莉莉魏冬
Owner INST OF INFORMATION ENG CHINESE ACAD OF SCI