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Mobile positioning using wireless networks: possibilities and fundamental limitations based on available wireless network measurements

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2 Author(s)
Gustafsson, F. ; Dept. of Electr. Eng., Linkaping Univ., Sweden ; Gunnarsson, F.

Positioning in wireless networks is mainly used for safety, gaming, and commercial services. It is expected to increase in popularity when emergency call services become mandatory as well as with the advent of more advanced location-based services and mobile gaming. In this article, we discuss and illustrate the possibilities and fundamental limitations associated with mobile positioning based on available wireless network measurements. The possibilities include a sensor fusion approach and model-based filtering, while the fundamental limitations provide hard bounds on the accuracy of position estimates, given the information in the measurements in the most favorable situation. The focus of this article is to illustrate the relation between performance requirements, such as those stated by the Federal Communications Commission (FCC), and the available measurements. Specific issues on accuracy limitation in each measurement, such as synchronization and multipath problems, are briefly commented upon. A geometrical example, as well as a realistic example adopted from a cell planning tool, are used for illustration.

Published in:

Signal Processing Magazine, IEEE  (Volume:22 ,  Issue: 4 )

Date of Publication:

July 2005

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