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Events for March 10, 2010
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Security in Large Wireless Networks
Wed, Mar 10, 2010 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dennis Goeckel,
Electrical and Computer Engineering,
University of Massachusetts - AmherstAbstract: Recently, there has been significant interest in providing secure communication in wireless networks. Here we consider the challenge of providing information theoretic secrecy in the presence of eavesdroppers, and, in contrast to prior work, focus in particular on the difficulty that arises due to a lack of knowledge of the eavesdropper location. To combat the resulting "near eavesdropper" problem, we employ cooperative jamming to confuse the eavesdropper and multi-user diversity to find relays that receive the packet in the presence of such jamming. For an environment with a single source and destination, along with N system nodes, we consider the number of eavesdroppers that can be tolerated for both the case when eavesdroppers do potentially have a significant geographical advantage over the receiver, and when they do not. Next, we consider multipair unicast transmission in large networks with n source-destination pairs and demonstrate an achievable tradeoff between the per-session througput of the system and the tolerable intensity of eavesdroppers.Biography: Dennis Goeckel split time between Purdue University and Sundstrand Corporation from 1987-1992, receiving his BSEE from Purdue in 1992. From 1992-1996, he was at the University of Michigan, where he received his MSEE in 1993 and his Ph.D. in 1996, both in Electrical Engineering with a specialty in Communication Systems. In September 1996, he joined the Electrical and Computer Engineering department at the University of Massachusetts, where he is currently a Professor. His current research interests are in the areas of communication systems and wireless network theory.Host: Keith Chugg, chugg@usc.edu, EEB 500A, 213-740-7294.Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
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Xampling -- Analog-to-digital at Sub-Nyquist rates
Wed, Mar 10, 2010 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Yonina Eldar,
Electrical Engineering,
Technion, IsraelAbstract: CSignal processing methods have changed substantially over the last several decades. The number of operations that are shifted from analog to digital is constantly increasing. While technology advances enable mass processing of huge data streams, the acquisition capabilities do not scale sufficiently fast so that the conversion to digital has become a serious bottleneck. For some applications, the maximal frequency of the input signals, which dictates the Nyquist rate, already exceeds the possible rates achievable with existing devices.In this talk, we present a new framework for sampling wideband analog signals at rates far below that dictated by the Nyquist rate. We refer to this methodology as Xampling: A combination of compression and sampling, performed simultaneously. Xampling merges results from standard sampling theory with recent developments in the field of compressed sensing in order to directly sample a wide class of analog signals at very low rates using existing hardware devices. This paradigm relies on exploiting structure inherent to many different classes of signals, which can be modeled mathematically as a union of subspaces.We begin by introducing the Xampling methodology and explaining why both sampling and compressed sensing alone are insufficient to address low rate sampling of a wide variety of analog signals. We then consider some specific examples including low rate sampling of multiband signals and recovery of time delays from low rate samples.Biography: Yonina C. Eldar received the B.Sc. degree in Physics in 1995 and the B.Sc. degree in Electrical Engineering in 1996 both from Tel-Aviv University (TAU), Tel-Aviv, Israel, and the Ph.D. degree in Electrical Engineering and Computer Science in 2001 from the Massachusetts Institute of Technology (MIT), Cambridge. From January 2002 to July 2002 she was a Postdoctoral Fellow at the Digital Signal Processing Group at MIT. She is currently a Professor in the Department of Electrical Engineering at the Technion - Israel Institute of Technology, Haifa, Israel. She is also a Research Affiliate with the Research Laboratory of Electronics at MIT. Dr. Eldar was in the program for outstanding students at TAU from 1992 to 1996. In 1998, she held the Rosenblith Fellowship for study in Electrical Engineering at MIT, and in 2000, she held an IBM Research Fellowship. From 2002-2005 she was a Horev Fellow of the Leaders in Science and Technology program at the Technion and an Alon Fellow. In 2004, she was awarded the Wolf Foundation Krill Prize for Excellence in Scientific Research, in 2005 the Andre and Bella Meyer Lectureship, in 2007 the Henry Taub Prize for Excellence in Research, in 2008 the Hershel Rich Innovation Award, the Award for Women with Distinguished Contributions, the Muriel & David Jacknow Award for Excellence in Teaching, and the Technion Outstanding Lecture Award, and in 2009 the Technion's Award for Excellence in Teaching. She is a member of the IEEE Signal Processing Theory and Methods technical committee and the Bio Imaging Signal Processing technical committee, an Associate Editor for the IEEE Transactions on Signal Processing, the EURASIP Journal of Signal Processing, the SIAM Journal on Matrix Analysis and Applications, and the SIAM Journal on Imaging Sciences, and on the Editorial Board of Foundations and Trends in Signal Processing.Host: Prof. Alex Dimakis, dimakis@usc.eduLocation: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
