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Department of Computer Science
The George Washington University 801 22nd Street NW, Suite 704 Washington DC 20052 Voice: (202) 994-7181 Fax: (202) 994-4875 E-mail: cs@gwu.edu  News and EventsCS @ GW Colloquium SeriesTitle: An Overview of Indoor Localization Research at NIST Wireless Communication Technologies Group Advanced Network Technologies Division National Institute of Standards and Technology Abstract ======== This presentation consists of two parts. In the first part we present NIST work on evaluating performance of various indoor RF ranging and direction finding methods by using ray tracing. In particular, we will consider several Time of Arrival (TOA) and Angle of Arrival (AOA) algorithms and present results on performance of these algorithms in several buildings as a function of RF signal bandwidth, center frequency, antenna type and height, and noise / interference levels. Our results suggest that it is hard to achieve localization results meeting first responders' expectations with AOA techniques, but TOA ranging can be promising. In the second part we present a generalization of the RADAR system that estimates the position of a given mobile source inside a building based on the received signal strength from at least three reference points. To reduce the number of the required access points and therefore, simplify the underlying coverage design problem, we propose a scheme that exploits the spatial distribution of RF energy around the receiver. We assume that the receiver is equipped with a circular array antenna with beamforming capability that can measure the spatial spectrum of the received power. This spatial spectrum can be used by a single receiver to estimate the position of the mobile transmitter. We investigate the feasibility of this methodology, and show the improvement achieved in localization accuracy. --------------------------- Nader Moayeri is the Manager of the Wireless Communication Technologies Group at the National Institute of Standards and Technology (NIST) in Gaithersburg. The Group's activities center around facilitating development of modern standards for wireless communications and providing technical guidance to other government agencies through testing, measurement, and performance evaluation. The Group is also involved in basic research in wireless communications and R&D activities. Prior to joing NIST in 1997, Dr. Moayeri worked at Hewlett-Packard Laboratories in Plao Alo, CA, in the area of digital image processing. Dr. Moayeri was on the faculty of the Department of Electrical and Computer Engineering at Rutgers, The State University of New Jersey from 1986 to 1994. He did most of his undergraduate work in Electrical Engineering at Sharif University of Technology in Tehran, Iran. He received M.S.E. degrees in Electrical Engineering and Computer, INformation, and Control Engineering and a Ph.D. degree in Electrical Engineering - Systems from the UNiversity of Michigan in 1980, 1981, and 1986, respectively. |
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