ActiviTune: A Multi-stage System for Activity Recognition of Passive Entities from Ambient FM-Radio Signals

  • Shuyu Shi
  • Stephan Sigg
  • Yusheng Ji
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7992)


The amplitude of a received RF-signal is affected by physical phenomena, such as reflection, refraction or scattering due to objects and individuals in the signal propagation path. Activities in the proximity of a receiver can thus induce a characteristic pattern on amplitude-based features. We investigate the use of the radio frequency channel to detect activities. ActiviTune, our passive device-free recognition system, implements a multi-stage classifier to recognise activities and situations in an indoor environment leveraging amplitude-based features of RF signals from an ambient FM radio source. Comparing with other RF-based approaches, ActiviTune has the advantage of neither installing a transmitter generating the signal nor equipping the monitored entities with any active component of the system. We experimentally demonstrate the distinction of two dynamic activities, ’walking’, ’crawling’, and three static activities, ’empty room’, ’standing’, ’lying’ with an average true positive rate of over 80%.


Activity recognition ambient context multi stage recognition 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Shuyu Shi
    • 1
  • Stephan Sigg
    • 1
  • Yusheng Ji
    • 1
  1. 1.National Institute of InformaticsTokyoJapan

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