Sensing motion using spectral and spatial analysis of WLAN RSSI

K. Kavitha Muthukrishnan, M.E.M. Lijding, Nirvana Meratnia, Paul J.M. Havinga

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    28 Citations (Scopus)
    311 Downloads (Pure)


    In this paper we present how motion sensing can be obtained just by observing the WLAN radio signal strength and its fluctuations. The temporal, spectral and spatial characteristics of WLAN signal are analyzed. Our analysis confirms our claim that ’signal strength from access points appear to jump around more vigorously when the device is moving compared to when it is still and the number of detectable access points vary considerably while the user is on the move’. Using this observation, we present a novel motion detection algorithm, Spectrally Spread Motion Detection (SpecSMD) based on the spectral analysis of WLAN signal’s RSSI. To benchmark the proposed algorithm, we used Spatially Spread Motion Detection (SpatSMD), which is inspired by the recent work of Sohn et al. Both algorithms were evaluated by carrying out extensive measurements in a diverse set of conditions (indoors in different buildings and outdoors - city center, parking lot, university campus etc.,) and tested against the same data sets. The 94% average classification accuracy of the proposed SpecSMD is outperforming the accuracy of SpatSMD (accuracy 87%). The motion detection algorithms presented in this paper provide ubiquitous methods for deriving the state of the user. The algorithms can be implemented and run on a commodity device with WLAN capability without the need of any additional hardware support.
    Original languageUndefined
    Title of host publicationProceedings of the 2nd European Conference on Smart Sensing and Context (EuroSSC 2007)
    Place of PublicationLondon
    Number of pages15
    ISBN (Print)978-3-540-75695-8
    Publication statusPublished - 23 Oct 2007
    Event2nd European Conference on Smart Sensing and Context, EuroSSC 2007 - Kendal, Lake District, United Kingdom
    Duration: 23 Oct 200725 Oct 2007
    Conference number: 2

    Publication series

    NameLecture Notes in Computer Science
    PublisherSpringer Verlag
    NumberPaper P-NS


    Conference2nd European Conference on Smart Sensing and Context, EuroSSC 2007
    Abbreviated titleEuroSSC
    Country/TerritoryUnited Kingdom
    CityKendal, Lake District


    • EWI-11326
    • METIS-245751
    • IR-64437
    • CAES-PS: Pervasive Systems

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