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Wireless Location in Non-Line-of-Sight Environments

Venkatraman, Saipradeep
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085685908

Abstract Details

2004, PhD, University of Cincinnati, Engineering : Electrical Engineering.
As the wireless personal communications industry grows rapidly, there is an increasing demand for accurate position location of a mobile station (MS) to provide emergency and other value-added services. Several location techniques utilizing terrestrial wireless network elements and radio signals have been proposed over the years. However, accurate positioning in a terrestrial wireless system is impeded by non-line-of-sight (NLOS) propagation and hearability issues. Traditional location algorithms have made the assumption that a line-of-sight (LOS) path exists between the MS and each base station (BS). This assumption is seldom met in the real world. The problem with early algorithmic approaches developed to deal with NLOS errors has been the tendency to trade-off location accuracy with the number of participating BSs. These location schemes require that there exist a large number of network elements that can “hear”, that is, receive signals from or transmit to, a MS with acceptable link quality. This is not feasible in practical wireless networks for a variety of reasons. The algorithms proposed in this dissertation use just the minimum number of BSs and adopt a constrained optimization approach for location estimation with NLOS error mitigation. Based on novel constraints derived from the geometry or bounds on the location errors based on measurement history, these algorithms attempt to estimate the true location parameters such as Times of Arrival (TOAs) and Angles of Arrival (AOAs). Also proposed is a novel hybrid geometrical method that utilizes the time difference of arrival (TDOA) and AOA approach for position location. Another aspect of this thesis deals with range-based statistical techniques to identify if the signal propagation is LOS or NLOS. We will present theoretical analysis and simulation results that substantiate our claims.
Dr. James Caffery (Advisor)
175 p.
TOA; AOA; TDOA; NLOS; Wireless Location

Recommended Citations

Citations

  • Venkatraman, S. (2004). Wireless Location in Non-Line-of-Sight Environments [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085685908

    APA Style (7th edition)

  • Venkatraman, Saipradeep. Wireless Location in Non-Line-of-Sight Environments. 2004. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085685908.

    MLA Style (8th edition)

  • Venkatraman, Saipradeep. "Wireless Location in Non-Line-of-Sight Environments." Doctoral dissertation, University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085685908

    Chicago Manual of Style (17th edition)

ucin1085685908
1,357
© 2004, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.