Challenges: device-free passive localization for wireless environments
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Dynamic clustering for tracking multiple transceiver-free objects
PERCOM '09 Proceedings of the 2009 IEEE International Conference on Pervasive Computing and Communications
Characterization of asymmetry in low-power wireless links: an empirical study
ICDCN'11 Proceedings of the 12th international conference on Distributed computing and networking
Mobility detection using everyday GSM traces
UbiComp'06 Proceedings of the 8th international conference on Ubiquitous Computing
A Fade-Level Skew-Laplace Signal Strength Model for Device-Free Localization with Wireless Networks
IEEE Transactions on Mobile Computing
Humantenna: using the body as an antenna for real-time whole-body interaction
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Spatial Models for Human Motion-Induced Signal Strength Variance on Static Links
IEEE Transactions on Information Forensics and Security - Part 1
Passive detection of situations from ambient FM-radio signals
Proceedings of the 2012 ACM Conference on Ubiquitous Computing
CoSDEO 2013: device-free radio-based recognition
Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication
Proceedings of International Conference on Advances in Mobile Computing & Multimedia
Hi-index | 0.00 |
Background: We investigate direct use of 802.15.4 radio signal strength indication (RSSI) for human activity recognition when 1) a user carries a wireless node (device-bound) and when 2) a user moves in the wireless sensor net (WSN) without a WSN node (device-free). We investigate recognition feasibility in respect to network topology, subject and room geometry (door open, half, closed). Methods: In a 2 person office room 8 wireless nodes are installed in a 3D topology. Two subjects are outfitted with a sensor node on the hip. Acceleration and RSSI are recorded while subject performs 6 different activities or room is empty. We apply machine learning for analysis and compare our results to acceleration data. Results: 10-fold cross-validation with all nodes gives accuracies of 0.896 (device-bound), 0.894 (device-free) and 0.88 (accelerometer). Topology investigation reveals that similar accuracies may be reached with only 5 (device-bound) or 4 (device-free) selected nodes. Applying trained data from one subject to the other and vice-versa shows higher recognition difference on RSSI than on acceleration. Changing of door state has smaller effect on both systems than subject change; with least impact when door is closed. Conclusion: 802.15.4 RSSI suited for activity recognition. 3D topology is helpful in respect to type of activities. Discrimination of subjects seems possible. Practical systems must adapt no only to long-term environmental dispersion but consider typical geometric changes. Adaptable, robust recognition models must be developed.