GPS-based Clock Synchronization in a Mobile, Distributed Real-Time System
Real-Time Systems - Special issue on global time in large scale distributed real-time systems, part I
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Improved Weighted Centroid Localization in Smart Ubiquitous Environments
UIC '08 Proceedings of the 5th international conference on Ubiquitous Intelligence and Computing
Zone-level occupancy counting with existing infrastructure
BuildSys '12 Proceedings of the Fourth ACM Workshop on Embedded Sensing Systems for Energy-Efficiency in Buildings
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Increasingly ubiquitous wireless technologies require novel localization techniques to pinpoint the position of an uncooperative node, whether the target is a malicious device engaging in a security exploit or a low-battery handset in the middle of a critical emergency. Such scenarios necessitate that a radio signal source be localized by other network nodes efficiently, using minimal information. We propose two new algorithms for estimating the position of an uncooperative transmitter, based on the received signal strength (RSS) of a single target message at a set of receivers whose coordinates are known. As an extension to the concept of centroid localization, our mechanisms weigh each receiver's coordinates based on the message's relative RSS at that receiver, with respect to the span of RSS values over all receivers. The weights may decrease from the highest RSS receiver either linearly or exponentially. Our simulation results demonstrate that for all but the most sparsely populated wireless networks, our exponentially weighted mechanism localizes a target node within the regulations stipulated for emergency services location accuracy.