Accuracy and stability analysis of path loss exponent measurement for localization in wireless sensor network

Pu, Chuan Chin * and Ooi, Pei Cheng and Chung, Wan-Young (2013) Accuracy and stability analysis of path loss exponent measurement for localization in wireless sensor network. International Journal of Digital Content Technology and Its Applications, 7 (7). pp. 1148-1156. ISSN 1975-9339

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Abstract

In wireless sensor network localization, path loss model is often used to provide a conversion between distance and received signal strength (RSS). Path loss exponent is one of the main environmental parameters for path loss model to characterize the rate of conversion. Therefore, the accuracy of path loss exponent directly influences the results of RSS-to-distance conversion. When the conversion requires distance estimation from RSS value, small error of measured path loss exponent could lead to large error of the conversion output. To improve the localization results, the approaches of measuring accurate parameters from different environments have become important. Different approaches provide different measurement stabilities, depending on the performance and robustness of the approach. This paper presents four calibration approaches to provide measurements of path loss exponent based on measurement arrangement and transmitter/receiver node’s allocation. These include one-line measurement, online-update spread locations measurement, online-update small-to big rectangular measurement, and online-update big-to-small rectangular measurement. The first two are general approaches, and the last two are our newly proposed approaches. Based on our research experiments, a comparison is presented among the four approaches in terms of accuracy and stability. The results show that both online-update rectangular measurements have better stability of measurements. For accuracy of measurement, online-update big-to-small rectangular measurement provides the best result after convergence.

Item Type: Article
Additional Information: First author with Sunway University; 2nd author with University of Nottingham Malaysia; 3rd author with Pukyong National University
Uncontrolled Keywords: calibration; radio ranging; received signal strength
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Sunway University > School of Science and Technology > Dept. Computer Sciences & Networked System
Depositing User: Ms. Molly Chuah
Date Deposited: 11 Jan 2014 15:16
Last Modified: 11 Jan 2014 15:16
URI: http://eprints.sunway.edu.my/id/eprint/202

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