Speaker: Professor Subhrakanti Dey, University of South Australia.
In this talk we will consider a secure estimation problem in the form of a remote state estimation task in the presence of an eavesdropper. A sensor transmits local state estimates over a packet-dropping link to a remote estimator, while an eavesdropper can successfully overhear each sensor transmission with a certain probability.
The objective is to determine when the sensor should transmit, in order to minimize the estimation error covariance at the remote estimator, while trying to keep the eavesdropper error covariance above a certain level. This is done by solving an optimization problem, that minimizes a linear combination of the expected remote estimation error covariance and the negative of the expected eavesdropper error covariance. Structural results on the optimal transmission policy are derived, and shown to exhibit thresholding behaviour in the estimation error covariances. Furthermore, for unstable systems, it is shown that in the infinite horizon situation there exist transmission policies, which can keep the expected remote estimation error covariance bounded while the expected eavesdropper error covariance is driven unbounded.
Subhrakanti Dey was born in India, in 1968. He received the Bachelor in Technology and Master in Technology degrees from the Department of Electronics and Electrical Communication Engineering, Indian Institute of Technology, Kharagpur, in 1991 and 1993, respectively, and the Ph.D. degree from the Department of Systems Engineering, Research School of Information Sciences and Engineering, Australian National University, Canberra, in 1996.
He is currently a Professor with the Institute of Telecommunications Research, University of South Australia in Adelaide, Australia. Prior to this, he was the Professor of Wireless Sensor Networks with the Dept. of Engineering Sciences in Uppsala University, Sweden during 2013-2017, and with the Department of Electrical and Electronic Engineering, University of Melbourne, Parkville, Australia, from 2000 until early 2013 (Full Professor since 2007). From September 1995 to September 1997, and September 1998 to February 2000, he was a Postdoctoral Research Fellow with the Department of Systems Engineering, Australian National University. From September 1997 to September 1998, he was a Postdoctoral Research Associate with the Institute for Systems Research, University of Maryland, College Park.
His current research interests include wireless communications and networks, signal processing for sensor networks, networked control systems, and molecular communication systems. Professor Dey currently serves on the Editorial Board of IEEE Transactions on Signal Processing and IEEE Transactions on Control of Network Systems. He was also an Associate Editor for the IEEE Transactions on Signal Processing during 2007-2010 and the IEEE Transactions on Automatic Control during 2004-2007, and Associate Editor for Elsevier Systems and Control Letters during 2003-2013.