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  • Research Article
  • Open Access

A Wireless Sensor Network for RF-Based Indoor Localization

  • 1Email author,
  • 1,
  • 2,
  • 1 and
  • 1
EURASIP Journal on Advances in Signal Processing20082008:731835

  • Received: 14 August 2007
  • Accepted: 26 March 2008
  • Published:


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.


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

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Authors’ Affiliations

Department of Computer Systems, Tampere University of Technology, P.O. Box 553, 33101 Tampere, Finland
Nokia, Devices R&D, Visiokatu 3, 33720 Tampere, Finland