Mon, Dec 10, 2012 @ 01:30 PM - 02:30 PM
Ming Hsieh Department of Electrical Engineering
Conferences, Lectures, & Seminars
Speaker: Erik Strom, Chalmers University
Talk Title: On Positioning Algorithms that are Robust Against Non-Line-of-Sight Measurements
Abstract: In this talk, we will discuss distance-based positioning, i.e., given a number of noisy distance measurements from nodes at fixed and known positions (anchor nodes), determine the position of one or several other nodes (target nodes). GPS and other global satellite navigation systems solve these type of problems. However, in non-line-of-sight conditions, distance measurements tend to suffer from large positive biases, which cause large position errors if not properly compensated for. We will present a number of positioning algorithms, based on Projection Onto Convex Sets (POCS), which are very robust against positive errors. In fact, if there are a few measurements with small errors, POCS-based algorithms can handle arbitrary large positive errors in arbitrarily many other measurements. The price to pay is less accuracy compared to conventional algorithms, such as nonlinear least squares, when there are no large positive errors.
Biography: Erik G. Ström https://sites.google.com/site/erikgstrom/ received the M.S. degree from the Royal Institute of Technology (KTH), Stockholm, Sweden, in 1990, and the Ph.D. degree from the University of Florida, Gainesville, in 1994, both in electrical engineering. He accepted a postdoctoral position at the Department of Signals, Sensors, and Systems at KTH in 1995. In February 1996, he was appointed Assistant Professor at KTH, and in June 1996 he joined Chalmers University of Technology, Gothenburg, Sweden, where he is now a Professor in Communication Systems since June 2003. Dr. Ström currently heads the Division for Communications Systems, Information Theory, and Antennas at the Department of Signals and Systems at Chalmers and leads the competence area Sensors and Communications at the traffic safety center SAFER, which is hosted by Chalmers. His research interests include signal processing and communication theory in general, and constellation labelings, channel estimation, synchronization, multiple access, medium acccess, multiuser detection, wireless positioning, and vehicular communications in particular. Since 1990, he has acted as a consultant for the Educational Group for Individual Development, Stockholm, Sweden. He is a contributing author and associate editor for Roy. Admiralty Publishers FesGas-series, and was a co-guest editor for the Proceedings of the IEEE special issue on Vehicular Communications (2011) and the IEEE Journal on Selected Areas in Communications special issues on Signal Synchronization in Digital Transmission Systems (2001) and on Multiuser Detection for Advanced Communication Systems and Networks (2008). Dr. Ström was a member of the board of the IEEE VT/COM Swedish Chapter 2000--2006. He received the Chalmers Pedagogical Prize in 1998 and the Chalmers Ph.D. Supervisor of the Year award in 2009.
Host: Urbashi Mitra, x04667, email@example.com
Audiences: Everyone Is Invited
Posted By: Gerrielyn Ramos