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DFPhaseFL: a robust device-free passive fingerprinting wireless localization system using CSI phase information

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Abstract

Device-free passive wireless indoor localization is attracting great interest in recent years due to the widespread deployment of Wi-Fi devices and the numerous location-based services requirements. In this paper, we propose DFPhaseFL, the first device-free fingerprinting indoor localization system that purely uses CSI phase information. It utilizes the CSI phase information extracted from simply a single link to estimate the location of the target, neither requiring the target to wear any electronic equipment nor deploying a large number of access points and monitor devices. In DFPhaseFL, the raw CSI phases are extracted from the CSI measurements through the three antennas of the Intel WiFi Link 5300 wireless Network Interface Card (IWL 5300 NIC) firstly. Then, linear transformation and noise filtering are applied to acquire the calibrated CSI phases. Through experimental observations, we find that the calibrated CSI phase owns an unpredictable characteristic over time. Thus, it cannot be directly applied as a fingerprint. To this end, a transfer deep supervised neural network method combining deep neural network and transfer learning is proposed to obtain feature representations with both transferability and discriminability as fingerprints. Then, the DFPhaseFL system uses the SVM algorithm to obtain the estimation of the target location online. Experiment results demonstrate that the DFPhaseFL owns a better estimation precision compared with the other state of art, and maintain a stable localization accuracy for a long time without reacquiring the fingerprint database.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 61673310 and 61703324.

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Authors and Affiliations

  1. Center for Complex Intelligent Networks, School of Mechano-Electronic Engineering, Xidian University, Xi’an, 710071, China

    Xinping Rao, Zhi Li, Yanbo Yang & Shengyang Wang

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  1. Xinping Rao
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  2. Zhi Li
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  3. Yanbo Yang
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  4. Shengyang Wang
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Correspondence to Zhi Li.

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Rao, X., Li, Z., Yang, Y. et al. DFPhaseFL: a robust device-free passive fingerprinting wireless localization system using CSI phase information. Neural Comput & Applic 32, 14909–14927 (2020). https://doi.org/10.1007/s00521-020-04847-1

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  • DOI: https://doi.org/10.1007/s00521-020-04847-1

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