No Need of Data Pre-processing: A General Framework for Radio-Based Device-Free Context Awareness

Wei, Bo, Li, Kai, Luo, Chengwen, Xu, Weitao, Zhang, Jin and Zhang, Kuan (2021) No Need of Data Pre-processing: A General Framework for Radio-Based Device-Free Context Awareness. ACM Transactions on Internet of Things, 2 (4). p. 29. ISSN 2577-6207

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Device-free context awareness is important to many applications. There are two broadly used approaches for device-free context awareness, i.e. video-based and radio-based. Video-based approaches can deliver good performance, but privacy is a serious concern. Radio-based context awareness applications have drawn researchers’ attention instead because it does not violate privacy and radio signal can penetrate obstacles. The existing works design explicit methods for each radio based application. Furthermore, they use one additional step to extract features before conducting classification and exploit deep learning as a classification tool. Although this feature extraction step helps explore patterns of raw signals, it generates unnecessary noise and information loss. The use of raw CSI signal without initial data processing was, however, considered as no usable patterns. In this paper, we are the first to propose an innovative deep learning based general framework for both signal processing and classification. The key novelty of this paper is that the framework can be generalised for all the radio-based context awareness applications with the use of raw CSI. We also eliminate the extra work to extract features from raw radio signals. We conduct extensive evaluations to show the superior performance of our proposed method and its generalisation.

Item Type: Article
Uncontrolled Keywords: device-free, channel state information, deep learning, context awareness
Subjects: G400 Computer Science
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Computer and Information Sciences
Depositing User: John Coen
Date Deposited: 28 May 2021 14:08
Last Modified: 26 Aug 2021 08:02

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