Adapting the Ranging Algorithm to the Positioning Technique in UWB Sensor Networks

Authors:
Mats Rydström;Luca Reggiani;Erik G. Ström;Arne Svensson
Affiliations:
Department of Signals and Systems, Chalmers University of Technology, Göteborg, Sweden 412-96;Dip. di Elettronica ed Informazione, Politecnico di Milano, Milano, Italy 20133;Department of Signals and Systems, Chalmers University of Technology, Göteborg, Sweden 412-96;Department of Signals and Systems, Chalmers University of Technology, Göteborg, Sweden 412-96
Venue:
Wireless Personal Communications: An International Journal
Year:
2008

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Abstract

Ultra-Wideband (UWB) is an emerging technology for short-range wireless communications. Due to the high bandwidth of UWB signals, accurate ranging and positioning is possible, which is one of many reasons why UWB is a candidate physical layer for another emerging research area, that of wireless sensor networks (WSNs). In this work, we argue that the ranging algorithm design should be made with the characteristics of the positioning algorithm in mind. In considering ranging and positioning in parallel, we are able to construct a range estimator that is tailored to the positioning algorithm, thereby achieving robustness to non-line-of-sight (NLOS) effects, reasonable overall complexity, and good performance in terms of positioning error. The analysis and simulations in this work are based on the channel models adopted by the IEEE 802.15.4a working group, and highlight the benefits and drawbacks of the proposed approach.