The active badge location system
ACM Transactions on Information Systems (TOIS)
The anatomy of a context-aware application
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
WLAN Location Determination via Clustering and Probability Distributions
PERCOM '03 Proceedings of the First IEEE International Conference on Pervasive Computing and Communications
Multi-Camera Multi-Person Tracking for EasyLiving
VS '00 Proceedings of the Third IEEE International Workshop on Visual Surveillance (VS'2000)
Using Area-Based Presentations and Metrics for Localization Systems in Wireless LANs
LCN '04 Proceedings of the 29th Annual IEEE International Conference on Local Computer Networks
Range-free localization and its impact on large scale sensor networks
ACM Transactions on Embedded Computing Systems (TECS)
A low-cost robust localization scheme for WLAN
WICON '06 Proceedings of the 2nd annual international workshop on Wireless internet
Relative Span Weighted Localization of Uncooperative Nodes in Wireless Networks
WASA '09 Proceedings of the 4th International Conference on Wireless Algorithms, Systems, and Applications
EURASIP Journal on Wireless Communications and Networking - Special issue on wireless network algorithms, systems, and applications
Towards a universal ontology for smart environments
Proceedings of the 11th International Conference on Information Integration and Web-based Applications & Services
A standard ontology for smart spaces
International Journal of Web and Grid Services
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Location-awareness is highly relevant subject in ubiquitous computing, as many applications exploit location information to provide adequate services or adapt to a changing physical environment. While GPS provides reliable outdoor localization, indoor positioning systems present a bigger challenge. Many indoor localization systems have been proposed. However, most of them rely on customized hardware or presume some dedicated infrastructure. In this paper, we focus on WLAN-based localization in smart ubiquitous environments. We propose an improved scheme of the Weighted Centroid Localization(WCL) algorithm that is robust and provides higher location accuracy than the original WCL algorithm. The improvements are based on the use of dynamic weighting factors that are solely dependent on the correlation of the Received Signal Strength Indicators of the received beacon signals. Compared to the original WCL scheme, our approach does not increase requirements to the environment. Real-world experiments in a typical environment that we report on in this paper confirm that the increased location accuracy determined in previous calculations is reproducible in a realistic noisy environment. This provides a simple, cost-efficient, and battery-conserving, but yet adequate technique for getting the accurate location information of mobile devices.