NDLI: A Technique to Enhance Localization in the Presence of NLOS Errors

Content Provider	IEEE Xplore Digital Library
Author	Misra, S. Weiyi Zhang Guoliang Xue
Copyright Year	2007
Description	Author affiliation: Arizona State Univ., Tempe (Misra, S.; Weiyi Zhang; Guoliang Xue)
Abstract	In a wireless network (WN), the wireless devices generally localize themselves with the help of anchors that are pre-deployed in the network. Some of the techniques commonly used for localization are time of arrival (ToA), time difference of arrival (TDoA), angle of arrival (AoA), and time of flight (ToF). In the wireless domain, measurements are susceptible to errors resulting from the nature of the medium, the relatively low precision, and the presence of obstacles, which produce non-line of sight (NLOS) errors. The NLOS errors are a major concern as they could result in significant degradation in accuracy. In this paper, we propose an efficient technique that uses the distance estimates of the device from a group of anchors to localize the device with better accuracy in the presence of NLOS errors. Our technique is based on the notion that in general, for any estimate, the proportion of the NLOS error can be upper bounded. Using this upper bound information our technique reduces the uncertainty in the position of the wireless device that is being localized. The technique is distributed and is simple. In comparison to the standard localization procedure, where localization is done independent of the presence of NLOS errors, our technique uses the information about the NLOS error bounds to improve the accuracy of estimation. Simulation results show that our technique reduces the position error of the wireless device by 40% on an average and by at least 80% in the best case. The uncertainty in localization is also reduced significantly.
Starting Page	1070
Ending Page	1075
File Size	173238
Page Count	6
File Format	PDF
ISBN	9781424410422
DOI	10.1109/GLOCOM.2007.206
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-11-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless networks Uncertainty Signal processing Time difference of arrival Degradation Upper bound Large-scale systems Robustness Land mobile radio cellular systems Costs
Content Type	Text
Resource Type	Article

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