Muthukrishnan, K. and Lijding, M.E.M. and Meratnia, N. and Havinga, P.J.M.
Sensing motion using spectral and spatial analysis of WLAN RSSI.
In: Proceedings of the 2nd European Conference on Smart Sensing and Context (EuroSSC 2007), 23-25 October 2007, Lake District, UK.
Lecture Notes in Computer Science 4793.
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Official URL: http://dx.doi.org/10.1007/978-3-540-75696-5_4
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.
|Item Type:||Conference or Workshop Paper (Full Paper, Talk)|
|Research Group:||EWI-CAES: Computer Architecture for Embedded Systems, EWI-DIES: Distributed and Embedded Security|
|Research Program:||CTIT-WiSe: Wireless and Sensor Systems|
|Research Project:||Smart Surroundings|
|Deposited On:||23 November 2007|
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