arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.02175cs.LGeess.SP
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基于深度学习的可视化无线电调制分类器

Visualizing Deep Learning-based Radio Modulation Classifier

Zhejiang University of Technology(浙江工业大学);Southeast University(东南大学);University of Macau(澳门大学)

Liang Huang, You Zhang, Weijian Pan, Jinyin Chen, Li Ping Qian, Yuan Wu

摘要:

最近,深度学习通过以端到端的方式提取和分类无线电特征,成功地应用于自动调制分类。然而,基于深度学习的无线电调制分类器缺乏可解释性,并且对于提取和选择何种无线电特征用于分类几乎没有解释或可见性。在本文中,我们通过引入类激活向量来可视化不同的基于深度学习的无线电调制分类器。具体而言,分别研究了基于卷积神经网络(CNN)的分类器和基于长短期记忆(LSTM)的分类器,并将其提取的无线电特征可视化。大量的数值结果表明,基于CNN的分类器和基于LSTM的分类器都提取了与调制参考点相关的相似的无线电特征。特别地,对于基于LSTM的分类器,其获得的无线电特征类似于人类专家的知识。我们的数值结果表明,基于深度学习的分类器提取的无线电特征很大程度上取决于无线电信号所携带的内容,并且短的无线电样本可能导致错误分类。

英文摘要:

Deep learning has recently been successfully applied in automatic modulation classification by extracting and classifying radio features in an end-to-end way. However, deep learning-based radio modulation classifiers are lack of interpretability, and there is little explanation or visibility into what kinds of radio features are extracted and chosen for classification. In this paper, we visualize different deep learning-based radio modulation classifiers by introducing a class activation vector. Specifically, both convolutional neural networks (CNN) based classifier and long short-term memory (LSTM) based classifier are separately studied, and their extracted radio features are visualized. Extensive numerical results show both the CNN-based classifier and LSTM-based classifier extract similar radio features relating to modulation reference points. In particular, for the LSTM-based classifier, its obtained radio features are similar to the knowledge of human experts. Our numerical results indicate the radio features extracted by deep learning-based classifiers greatly depend on the contents carried by radio signals, and a short radio sample may lead to misclassification.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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