Adding indoor location capabilities to an IEEE 802.11 WLAN using real-time RTT measurements

  • Authors:

  • J. Prieto;A. Bahillo;S. Mazuelas;R. M. Lorenzo;J. Blas;P. Fernández

  • Affiliations:

  • Center for the Development of Telecommunications, Edificio Solar. Parque Tecnolóico de Boecillo, Boecillo, Valladolid, Spain;Center for the Development of Telecommunications, Edificio Solar. Parque Tecnolóico de Boecillo, Boecillo, Valladolid, Spain;Center for the Development of Telecommunications, Edificio Solar. Parque Tecnolóico de Boecillo, Boecillo, Valladolid, Spain;Department of Signal Theory and Communications and Telematic Engineering, University of Valladolid, Valladolid, Spain;Center for the Development of Telecommunications, Edificio Solar. Parque Tecnolóico de Boecillo, Boecillo, Valladolid, Spain;Department of Signal Theory and Communications and Telematic Engineering, University of Valladolid, Valladolid, Spain

  • Venue:
  • WTS'09 Proceedings of the 2009 conference on Wireless Telecommunications Symposium
  • Year:
  • 2009

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Abstract

An accurate real-time application which locates mobile users in an indoor environment is highly demanded in hospitals, warehouses, etc., provided that minor changes in their infrastructure are required. Most present-day location techniques require a great calibration effort, or special devices which are not cost-effective. Avoiding these needs, this paper implements an autonomous positioning technique based on IEEE 802.11 RTS/CTS two-frame exchange in a real scenario. Two estimators of the delay profile measured are analyzed and a linear regression of them at each distance is performed from which the distance between a mobile user and an access point is estimated. Experimental results, without any tracking information nor nonline-of-sight mitigation, reveal the effectiveness of the proposed method.