International Symposium on Wireless Pervasive Computing 200

Breaking Spectrum Gridlock via Cognitive and Cooperative Radios

Professor Andrea Goldsmith

Abstract

The key to efficient use of wireless spectrum is managing the interference between users. The premise of our work is that the best way to manage interference is to exploit it, and such exploitation leads to tremendous spectral efficiency gains. In particular, we propose novel cooperative and cognitive radio methods that use signal transmissions overheard from other nodes to increase capacity. These techniques include virtual MIMO, generalized relaying, cognitive relaying, interference forwarding, and conferencing. We show that these strategies provide significant performance improvement in terms of the network capacity. Our results offer innovative ideas to improve performance in wireless networks, as well as guidelines for new wireless networking paradigms that improve efficiency of spectrum usage in both licensed and unlicensed frequency bands.

Bio

Andrea Goldsmith is a professor of Electrical Engineering at Stanford University, and was previously an assistant professor of Electrical Engineering at Caltech. She has also held industry positions at Maxim Technologies and at AT&T Bell Laboratories, and is currently on leave from Stanford as co-founder and CTO of Quantenna Communications, Inc. Her research includes work on capacity of wireless channels and networks, wireless communication and information theory, energy-constrained wireless communications, wireless communications for distributed control, and cross-layer design of wireless networks. She is author of the book ``Wireless Communications'' and co-author of the book ``MIMO Wireless Communications,'' both published by Cambridge University Press. She received the B.S., M.S. and Ph.D. degrees in Electrical Engineering from U.C. Berkeley.

Dr. Goldsmith is a Fellow of the IEEE and of Stanford. She has received several awards for her research, including the National Academy of Engineering Gilbreth Lectureship, the Alfred P. Sloan Fellowship, the Stanford Terman Fellowship, the National Science Foundation CAREER Development Award, and the Office of Naval Research Young Investigator Award. She was also a co-recipient of the 2005 IEEE Communications Society and Information Theory Society joint paper award. She currently serves as associate editor for the IEEE Transactions on Information Theory and as editor for the Journal on Foundations and Trends in Communications and Information Theory and in Networks. She was previously an editor for the IEEE Transactions on Communications and for the IEEE Wireless Communications Magazine, and has served as guest editor for several IEEE journal and magazine special issues. Dr. Goldsmith is active in committees and conference organization for the IEEE Information Theory and Communication Societies and is an elected member of the Board of Governors for both societies. She is a distinguished lecturer for the IEEE Communications Society, the vice-president and student committee founder of the IEEE Information Theory Society, and was the technical program co-chair for the 2007 IEEE International Symposium on Information Theory.

Stochastic Geometry and Wireless Network Modeling

Professor Francois Baccelli

Abstract

The geometry of the location of mobiles and/or base stations plays a key role in several classes of wireless communication networks where it determines the signal to interference ratio for each potential channel and hence the possibility of establishing simultaneously some set of communications at a given bit rate.

Stochastic geometry provides a natural way of defining (and computing) macroscopic properties of such networks, by some averaging over all potential geometrical patterns for e.g. the mobiles. The talk will survey recent results obtained by this approach for analyzing key properties of wireless networks such as coverage or connectivity, and for evaluating the performance of a variety of protocols used in this context such as medium access control or routing.

Bio

Francois Baccelli is a specialist of communication network modeling and design.

He got his "doctorat d'etat" from Universite Paris-Sud in 1983. He held positions at INRIA Rocquencourt, AT&T Bell Laboratories and INRIA Sophia Antipolis. He is currently INRIA "directeur de recherche" in the computer science department of Ecole Normale Superieure in Paris, where he started the research group on communication networks in 1999.

He is the co-author of a book on queueing theory with P. Bremaud and on a book on the max plus algebra with G. Cohen, G.J. Olsder and J.P. Quadrat. His current research work is focused on two topics: 1) the analysis, the control and measurements of large IP networks and 2) the development of new stochastic geometry tools for assessing and exploiting the capacity of wireless networks.

F. Baccelli is a member of the French academy of sciences.

Research Challenges in Cognitive Radio Networks

Professor Vijay Bhargava

Abstract

The cognitive radio technology will allow a group of potential users to identify and access available spectrum resources provided that the interference to users for whom the band has been licensed is kept below a prescribed level. This research area is at an early stage because various research challenges have to be addressed and solved. In this talk we present an overview of some research issues for cognitive radio networks. Specifically, we present research and developments in cognitive radio networks with focus on: i) spectrum sensing, ii) link adaptation, iii) advanced transceiver design, and iv) admission control. We discuss research problems related to these specific topics that need to be addressed before deployment of cognitive radio systems.

Bio

Vijay K. Bhargava received his B.Sc., M.Sc. and Ph.D. degrees from Queen's University, Kingston, Ontario in 1970, 1972 and 1974 respectively. Vijay has held regular/visiting appointments at the Indian Institute of Science, University of Waterloo, Concordia University, Ecole Polytechnique de Montreal, UNIDO, NTT Wireless Communications Labs, Tokyo Institute of Technology, University of Indonesia, the Hong Kong University of Science and Technology, The Hong Kong University and the University of Victoria. Currently he is a professor and Head of the Department of Electrical and Computer Engineering at the University of British Columbia.

Vijay served as the Founder and President of "Binary Communications Inc." (1983-2000). He has provided consulting services to several companies and government agencies. He is a co-author (with D. Haccoun, R. Matyas and P. Nuspl) of "Digital Communications by Satellite" (New York: Wiley 1981), a co-editor (with S. Wicker) of "Reed Solomon Codes and their Applications" (IEEE Press 1994) and a co-editor (with V. Poor, V. Tarokh and S. Yoon) of "Communications, Information and Network Security" (Kluwer: 2003) and a co-editor (with E. Hossain) of “Cognitive Wireless Communications Networks” (Springer: 2007). He has served as Editor for the IEEE Transactions on Wireless Communications and the IEEE Transactions on Communications. In January 2007, he was appointed Editor-in-Chief of the IEEE Transactions on Wireless Communications.

A Fellow of the IEEE, the Engineering Institute of Canada (EIC), the Royal Society of Canada, and the Canadian Academy of Engineering, Vijay has been honoured many times by his colleagues and has received numerous awards. Vijay is very active in the IEEE and has served as the President of the Information Theory Society, Vice President for Regional Activities Board, Director of Region 7, Montreal Section Chair and Victoria Section Chair. He is a past member of the Board of Governors of the IEEE Communications Society and the IEEE Information Theory Society. He was nominated by the IEEE BoD as a candidate for the office of President-Elect in 1996, 2002 and 2003. His current research interest is adaptive wireless access system design for cognitive radio networks.