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Entropy 2018, 20(3), 198; https://doi.org/10.3390/e20030198

Modulation Signal Recognition Based on Information Entropy and Ensemble Learning

1
College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China
2
College of Air Traffic Management, Civil Aviation University of China, Tianjin 300300, China
3
Department of Electrical and Computer Engineering, Western New England University, Springfield, MA 01119, USA
*
Author to whom correspondence should be addressed.
Received: 30 January 2018 / Revised: 13 March 2018 / Accepted: 14 March 2018 / Published: 16 March 2018
(This article belongs to the Special Issue Radar and Information Theory)
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Abstract

In this paper, information entropy and ensemble learning based signal recognition theory and algorithms have been proposed. We have extracted 16 kinds of entropy features out of 9 types of modulated signals. The types of information entropy used are numerous, including Rényi entropy and energy entropy based on S Transform and Generalized S Transform. We have used three feature selection algorithms, including sequence forward selection (SFS), sequence forward floating selection (SFFS) and RELIEF-F to select the optimal feature subset from 16 entropy features. We use five classifiers, including k-nearest neighbor (KNN), support vector machine (SVM), Adaboost, Gradient Boosting Decision Tree (GBDT) and eXtreme Gradient Boosting (XGBoost) to classify the original feature set and the feature subsets selected by different feature selection algorithms. The simulation results show that the feature subsets selected by SFS and SFFS algorithms are the best, with a 48% increase in recognition rate over the original feature set when using KNN classifier and a 34% increase when using SVM classifier. For the other three classifiers, the original feature set can achieve the best recognition performance. The XGBoost classifier has the best recognition performance, the overall recognition rate is 97.74% and the recognition rate can reach 82% when the signal to noise ratio (SNR) is −10 dB. View Full-Text
Keywords: entropy feature; feature selection; ensemble learning; radar entropy feature; feature selection; ensemble learning; radar
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Zhang, Z.; Li, Y.; Jin, S.; Zhang, Z.; Wang, H.; Qi, L.; Zhou, R. Modulation Signal Recognition Based on Information Entropy and Ensemble Learning. Entropy 2018, 20, 198.

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