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Phascope: Fine-Grained, Fast, Flexible Motion Profiling based on Phase Offset in Acoustic OFDM Signal

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Abstract

Acoustic Doppler shift estimation is a cost-effective way to implement Human-Computer Interaction applications across existing smart devices such as smart phones and smart spekaers. However, due to the inherent uncertainty principle in the traditional time-frequency analysis, it remains challenging to profile motions accurately and timely. In this paper, phase offset in acoustic OFDM signal is leveraged for developing Phascope, a fine-grained, fast and flexible motion profiling scheme. We evaluate Phascope using simulation and experiment on COTS devices. Sub-millisecond response time is achieved for Phascope in our experiment. Besides, with optimal subcarrier selection and SNR of 30 dB over all subcarriers, Phascope can estimate motion speed of 0.1 m/s with 6.75% root-mean-square error (RMSE) compared to optimized FFT method.

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Authors and Affiliations

  1. TECO, Karlsruhe Institute of Technology, Vincenz-Prießnitz-Straße 1, 76131, Karlsruhe, Germany

    Long Wang, Till Riedel, Markus Scholz & Michael Beigl

  2. School of Computer Science and Technology, University of Science and Technology of China, No. 96, JinZhai Road, 230026, Hefei, China

    Panlong Yang

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  1. Long Wang
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  2. Till Riedel
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  3. Markus Scholz
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  4. Michael Beigl
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  5. Panlong Yang
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Correspondence to Long Wang.

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Wang, L., Riedel, T., Scholz, M. et al. Phascope: Fine-Grained, Fast, Flexible Motion Profiling based on Phase Offset in Acoustic OFDM Signal. Mobile Netw Appl 25, 537–550 (2020). https://doi.org/10.1007/s11036-019-01370-z

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  • DOI: https://doi.org/10.1007/s11036-019-01370-z

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