Modulation identification method based on interference cleaning and two-stage training of convolutional neural network model

Abstract

The invention discloses a modulation identification method based on interference cleaning and two-stage training of a convolutional neural network model. The method comprises the following steps: firstly, generating an original periodic correlation characteristic digital spectrogram by utilizing an acquired modulation signal sample sequence; carrying out generalization singular value decompositionoperation, space division operation, noise elimination operation, crosstalk suppression operation and other processing on the convolutional neural network to obtain an original final period correlation characteristic digital spectrogram, and then carrying out two-stage training on the convolutional neural network to obtain a convolutional neural network model. The identification and classification of the modulation mode of the input modulation signal are realized. The method has the remarkable characteristics that the complexity is reduced while the modulation recognition and classification accuracy is improved; additional noise can be eliminated, crosstalk from adjacent channels can be suppressed, and the authenticity of training and identifying signal data is enhanced. The generalization capability of modulation identification is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a modulation recognition method based on interference cleaning and two-stage training of a convolutional neural network model. Background technique [0002] In my country's existing radio frequency band authorization rules, the 230MHz frequency band is a dynamic shared frequency band allocated to industries such as electric power and water conservancy. Among them, 223-226MHz and 229-233MHz are used for broadband wireless private networks, and 226-228 / 233-235MHz And 228-229MHz for narrowband wireless private network. Widely used modulation modes include BPSK, QPSK, 2FSK, 4FSK, MSK, AM, and FM. [0003] In the prior art, in order to save network construction costs and improve spectrum utilization, it is generally recommended to adopt a shared network construction mode. However, this model has the following drawbacks: [0004] First, there are channel defects such a...

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Problems solved by technology

[0004] First, there are channel defects such as multipath fading, frequency drift and phase noise in the frequency band, and the radio signal leakage of adjacent channels will cause crosstalk to the wireless private network;

[0005] Second, the lack of communication and negotiation between the wireless communication industry, coupled with the random and disorderly occupation of various illegal stations, will inevitably cause potential interference hazards to the reliable operation of the wireless private network. It is necessary to explore effective methods to accurately identify the types of interference and Interference traceability, and then take corresponding countermeasures

However, the above feature learning method can only achieve better recognition accuracy under specific conditions, and feature selection requires the design of feature engineering, which relies heavily on experience accumulation, resulting in poor universality and unstable results.

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