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WiFi CSI-based device-free sensing: from Fresnel zone model to CSI-ratio model

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Abstract

Over the past decade, WiFi CSI-based device-free sensing technology has shown great potential in smart homes, assisted living, and many other applications. While model-based device-free sensing approaches analyze and recognize human behaviors by constructing mathematical relationships among WiFi devices, environment, human position/posture, and received channel state information, they have attracted great attention because of the interpretable physical meaning and the ability to guide the WiFi-based sensing system design. In this paper, we retrospect two general-purpose sensing models, i.e., the Fresnel zone model and CSI-ratio model, and demonstrate how these two models are leveraged to extract insightful properties and support a variety of device-free sensing applications.

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Acknowledgements

This research is supported by National Natural Science Foundation of China A3 Project (No. 62061146001), EU CHIST-ERA RadioSense Project, EU Horizon 2020 research and innovation programme IDEA-FAST (No. 853981), National Natural Science Foundation of China (No. 61802373), Youth Innovation Promotion Association, Chinese Academy of Sciences (No. 2020109), and PKU-Baidu Funded Project 2019BD005.

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Authors and Affiliations

  1. Department of Computer Science and Technology, Peking University, Beijing, China

    Dan Wu, Youwei Zeng & Daqing Zhang

  2. Institute of Software, Chinese Academy of Sciences, Beijing, China

    Fusang Zhang

  3. Telecom SudParis, Institut Polytechnique de Paris, Paris, France

    Daqing Zhang

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  1. Dan Wu
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  2. Youwei Zeng
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  3. Fusang Zhang
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  4. Daqing Zhang
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Correspondence to Daqing Zhang.

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Wu, D., Zeng, Y., Zhang, F. et al. WiFi CSI-based device-free sensing: from Fresnel zone model to CSI-ratio model. CCF Trans. Pervasive Comp. Interact. 4, 88–102 (2022). https://doi.org/10.1007/s42486-021-00077-z

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