NDLI: Indoor Angle of Arrival positioning using biased estimation

Content Provider	IEEE Xplore Digital Library
Author	Tay, B. Wei Liu Dan Hong Zhang
Copyright Year	2009
Description	Author affiliation: Manufacturing Execution and Control, Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075 (Tay, B.; Wei Liu; Dan Hong Zhang)
Abstract	We consider the problem of estimating the position of an indoor wireless transmitter. Based on Angle of Arrival (AOA) readings from several base stations, a wireless transmitter's position has traditionally been determined using a least-squares approach. In particular, care is taken to ensure that the least-squares estimator is unbiased. Unbiased estimators are known minimize the difference between the estimate and the average value of the readings, not the actual value. Biased estimators, in contrast, have been shown to result in a lower mean-squared error, which in turn produces more accurate position estimates. We propose the use of a biased estimator to augment the traditional least-squares approach, and develop a methodology to obtain this estimator. Using real data from a commercial indoor Ultra-Wideband (UWB) Real Time Location System (RTLS), we show that our estimator produces more accurate position estimates than the traditional unbiased estimator. We also show that our simple estimator performs comparably to more complex positioning algorithms.
Starting Page	458
Ending Page	463
File Size	270295
Page Count	6
File Format	PDF
ISBN	9781424437597
ISSN	19354576
DOI	10.1109/INDIN.2009.5195847
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-23
Publisher Place	UK
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Antenna measurements Base stations Angle of arrival Radio transmitters Indoor environments Radio frequency biased estimation positioning Hardware Ultra-Wideband Manufacturing Frequency synchronization Ultra wideband technology Antenna arrays
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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