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Exploring Landmark Placement Strategies for Topology-Based Localization in Wireless Sensor Networks

Abstract

In topology-based localization, each node in a network computes its hop-count distance to a finite number of reference nodes, or "landmarks". This paper studies the impact of landmark placement on the accuracy of the resulting coordinate systems. The coordinates of each node are given by the hop-count distance to the landmarks. We show analytically that placing landmarks on the boundary of the topology yields more accurate coordinate systems than when landmarks are placed in the interior. Moreover, under some conditions, we show that uniform landmark deployment on the boundary is optimal. This work is also the first empirical study to consider not only uniform, synthetic topologies, but also nonuniform topologies resembling more concrete deployments. Our simulation results show that, in general, if enough landmarks are used, random landmark placement yields comparative performance to placing landmarks on the boundary randomly or equally spaced. This is an important result since boundary placement, especially at equal distances, may turn out to be infeasible and/or prohibitively expensive (in terms of communication, processing overhead, and power consumption) in networks of nodes with limited capabilities.

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Correspondence to Farid Benbadis.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Benbadis, F., Obraczka, K., Cortés, J. et al. Exploring Landmark Placement Strategies for Topology-Based Localization in Wireless Sensor Networks. EURASIP J. Adv. Signal Process. 2008, 275658 (2007). https://doi.org/10.1155/2008/275658

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Keywords

  • Coordinate System
  • Power Consumption
  • Sensor Network
  • Wireless Sensor Network
  • Quantum Information