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Issue No.03 - March (2012 vol.34)
pp: 587-600
Sinno Jialin Pan , Institute for Infocom Research, Singapore
Jie Yin , CSIRO ICT Centre, Marsfield
Jeffrey Junfeng Pan , Facebook, Inc., Palo Alto
Qiang Yang , Hong Kong University of Science and Technology, Hong Kong
Recent years have witnessed the growing popularity of sensor and sensor-network technologies, supporting important practical applications. One of the fundamental issues is how to accurately locate a user with few labeled data in a wireless sensor network, where a major difficulty arises from the need to label large quantities of user location data, which in turn requires knowledge about the locations of signal transmitters or access points. To solve this problem, we have developed a novel machine learning-based approach that combines collaborative filtering with graph-based semi-supervised learning to learn both mobile users' locations and the locations of access points. Our framework exploits both labeled and unlabeled data from mobile devices and access points. In our two--phase solution, we first build a manifold-based model from a batch of labeled and unlabeled data in an offline training phase and then use a weighted k-nearest-neighbor method to localize a mobile client in an online localization phase. We extend the two-phase colocalization to an online and incremental model that can deal with labeled and unlabeled data that come sequentially and adapt to environmental changes. Finally, we embed an action model to the framework such that additional kinds of sensor signals can be utilized to further boost the performance of mobile tracking. Compared to other state-of-the-art systems, our framework has been shown to be more accurate while requiring less calibration effort in our experiments performed on three different testbeds.
Wireless sensor networks, semi-supervised learning, indoor localization, colocalization, AI applications.
Sinno Jialin Pan, Jie Yin, Jeffrey Junfeng Pan, Qiang Yang, "Tracking Mobile Users in Wireless Networks via Semi-Supervised Colocalization", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol.34, no. 3, pp. 587-600, March 2012, doi:10.1109/TPAMI.2011.165
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