Abstract
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 language | Undefined |
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Title of host publication | Proceedings of the 2nd European Conference on Smart Sensing and Context (EuroSSC 2007) |
Place of Publication | London |
Publisher | Springer |
Pages | 62-76 |
Number of pages | 15 |
ISBN (Print) | 978-3-540-75695-8 |
DOIs | |
Publication status | Published - 23 Oct 2007 |
Event | 2nd European Conference on Smart Sensing and Context, EuroSSC 2007 - Kendal, Lake District, United Kingdom Duration: 23 Oct 2007 → 25 Oct 2007 Conference number: 2 |
Publication series
Name | Lecture Notes in Computer Science |
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Publisher | Springer Verlag |
Number | Paper P-NS |
Volume | 4793 |
Conference
Conference | 2nd European Conference on Smart Sensing and Context, EuroSSC 2007 |
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Abbreviated title | EuroSSC |
Country/Territory | United Kingdom |
City | Kendal, Lake District |
Period | 23/10/07 → 25/10/07 |
Keywords
- EWI-11326
- METIS-245751
- IR-64437
- CAES-PS: Pervasive Systems