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A Wireless Sensor Network for RF-Based Indoor Localization

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Abstract

An RF-based indoor localization design targeted for wireless sensor networks (WSNs) is presented. The energy-efficiency of mobile location nodes is maximized by a localization medium access control (LocMAC) protocol. For location estimation, a location resolver algorithm is introduced. It enables localization with very scarce energy and processing resources, and the utilization of simple and low-cost radio transceiver HardWare (HW) without received signal strength indicator (RSSI) support. For achieving high energy-efficiency and minimizing resource usage, LocMAC is tightly cross-layer designed with the location resolver algorithm. The presented solution is fully calibration-free and can cope with coarse grained and unreliable ranging measurements. We analyze LocMAC power consumption and show that it outperforms current state-of-the-art WSN medium access control (MAC) protocols in location node energy-efficiency. The feasibility of the proposed localization scheme is validated by experimental measurements using real resource constrained WSN node prototypes. The prototype network reaches accuracies ranging from 1 m to 7 m.With one anchor node per a typical office room, the current room of the localized node is determined with 89.7% precision.

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Correspondence to Ville A. Kaseva.

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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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Kaseva, V.A., Kohvakka, M., Kuorilehto, M. et al. A Wireless Sensor Network for RF-Based Indoor Localization. EURASIP J. Adv. Signal Process. 2008, 731835 (2008) doi:10.1155/2008/731835

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Keywords

  • Wireless Sensor Network
  • Medium Access Control
  • Receive Signal Strength Indicator
  • Anchor Node
  • Radio Transceiver