Select a calendar:
Filter November Events by Event Type:
SUNMONTUEWEDTHUFRISAT
Events for November 07, 2007
-
Cooperative and Competitive Coalitions in Wireless Interference Channels
Wed, Nov 07, 2007 @ 10:00 AM - 11:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Dr. Lalitha Sankar, Postdoctoral Fellow, Princeton UniversityABSTRACT: Cooperation in multi-terminal networks can be induced in many ways. In this talk we investigate the formation of cooperative coalitions among rational users (transmit-receive links) in a K-link interference channel (IC) using coalitional game theory. Modeling the rate achieved by a user as its utility, we show that the stable coalition structure, i.e., set of coalitions from which users have no incentives to defect, depends on the manner in which the rate gains are apportioned among the cooperating users. We study transmitter and receiver cooperation in an IC as two distinct cooperative models and in each case focus on the stability of the grand coalition (GC) of all users for both flexible (transferable) and fixed (non-transferable) apportioning schemes. We show that the GC is the stable sum-rate optimal coalition when only receivers cooperate by jointly decoding (transferable). However the stability of the GC depends on the detector when receivers cooperate using linear multiuser detectors (non-transferable). For transmitter cooperation it is assumed that all receivers cooperate perfectly and that users outside a coalition act as jammers. We present results on the stability of the GC for both the case of perfectly cooperating transmitters (transferrable) and under a partial decode-and-forward strategy (non-transferable). We show that the stability depends on the channel gains for the former and the transmitter jamming strengths for the latter.BIO: Lalitha Sankar received the B.Tech degree in Engineering Physics from the Indian Institute of Technology, Bombay in 1992, the MS degree in Electrical Engineering from the University of Maryland, Baltimore County in 1994, and the Ph.D degree in Electrical Engineering from Rutgers University in June 2005. She is presently a Science and Technology postdoctoral fellow at Princeton University. After her masters, Lalitha worked for a year at Polaroid Corporation's Engineering R&D, following which she was a Senior Member of Technical Staff at AT&T Shannon Labs until March 2002.Host: Prof. Urbashi Mitra, ubli@usc.edu
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Mayumi Thrasher
-
Distinguished Lecture Series: Information Theory of Wireless Networks: A Deterministic Approach
Wed, Nov 07, 2007 @ 03:30 PM - 04:30 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: David Tse, University of California BerkeleyABSTRACT: Gaussian channels are commonly used models for multiuser wireless communication. Unfortunately, the capacity of multiuser Gaussian channels is unknown even for simple networks such as the single-relay channel and the two-user interference channel. To make further progress in understanding how to optimally communicate over these and more general networks, we propose a deterministic channel model which focuses on the interaction between the users rather than the noise in the system. We show: 1) the analytical simplicity of this model by computing the capacities of several interference and relay networks based on this deterministic model; 2) how the insights from the deterministic model can be translated into finding near-optimal strategies for the Gaussian counterpart.BIO: David Tse received the B.A.Sc. degree in systems design engineering from University of Waterloo, Canada in 1989, and the M.S. and Ph.D. degrees in electrical engineering from Massachusetts Institute of Technology in 1991 and 1994 respectively. From 1994 to 1995, he was a postdoctoral member of technical staff at A.T. & T. Bell Laboratories. Since 1995, he has been at the Department of Electrical Engineering and Computer Sciences in the University of California at Berkeley, where he is currently a Professor.
He received a 1967 NSERC 4-year graduate fellowship from the government of Canada in 1989, a NSF CAREER award in 1998, the Best Paper Awards at the Infocom 1998 and Infocom 2001 conferences, the Erlang Prize in 2000 from the INFORMS Applied Probability Society, the IEEE Communications and Information Theory Society Joint Paper Award in 2001, and the Information Theory Society Paper Award in 2003. He was the Technical Program co-chair of the International Symposium on Information Theory in 2004, and was an Associate Editor of the IEEE Transactions on Information Theory from 2001 to 2003. He is a coauthor, with Pramod Viswanath, of the text "Fundamentals of Wireless Communication". His research interests are in information theory, wireless communications and networking.HOST: Prof. Caire GiuseppeAudiences: Graduate/Department /Faculty
Contact: Estela Lopez
