seminar:M. Cenk Gürsoy,June 02, 2010 Wednesday, FENS G032, 13:00 P.M.

ENERGY EFFICIENCY IN WIRELESS COMMUNICATIONS –The Impact of Quality of Service Constraints, Secrecy, and Channel Uncertainty

M. Cenk Gürsoy (the University of Nebraska-Lincoln)

Abstract: Next generation wireless systems will be designed to provide high-data-rate communications anytime and anywhere in a secure, reliable, and robust fashion while making efficient use of resources. This wireless vision will enable mobile multimedia communications. Indeed, one of the features of fourth generation (4G) wireless systems is the ability to support multimedia services at low transmission costs.  However, before this vision is realized, many technical challenges have to be addressed.
In most wireless systems, an important consideration is energy efficiency. Especially in mobile applications, energy resources are scarce and have to be conserved. Moreover, with emerging applications in wireless ad-hoc and wireless sensor networks, energy-efficient operation is becoming a critical issue, especially when the replenishment of energy resources is not easy, rendering the lifetime of the wireless network highly dependent on energy consumption. In addition to energy efficiency, other pivotal concerns in next-generation wireless systems are providing certain quality of service guarantees such as delay bounds in multimedia applications, securing the transmissions, and operating reliably under randomly-varying channel conditions.
In this talk, we will discuss the impact of quality of service constraints, secrecy requirements, and channel uncertainty on the energy efficiency of a wireless system. Following an information-theoretic approach, we will establish the fundamental performance limits and quantify the increased energy requirements in the presence of these considerations. In particular, we will consider different performance metrics, such as effective capacity under buffer limitations, secrecy capacity, and ergodic Shannon capacity, to measure the throughput. We will identify the minimum energy required to send one bit of information reliably. In a general setting in which multiple-antennas are available at both the transmitter and receiver, we will determine the optimal transmission strategies for energy-efficient operation, and characterize the key tradeoffs. 

Bio: M. Cenk Gursoy received the B.S. degree in electrical and electronic engineering from Bogazici University, Istanbul, Turkey, in 1999 with high distinction, and the Ph.D. degree in electrical engineering from Princeton University, Princeton, NJ, USA, in 2004. He was a recipient of the Gordon Wu Graduate Fellowship from Princeton University between 1999 and 2003. In the summer of 2000, he worked at Lucent Technologies, Holmdel, NJ, where he conducted performance analysis of DSL modems. Since September 2004, he has been an Assistant Professor in the Department of Electrical Engineering at the University of Nebraska-Lincoln (UNL). His research interests are in the general areas of wireless communications, information theory, communication networks, and signal processing. He has been a member of the technical program committees of major IEEE conferences in these areas. He is currently serving as a member of the editorial board of the IEEE Transactions on Wireless Communications and the Elsevier Journal Physical Communication. He received an NSF CAREER Award in 2006. More recently, in 2009, he received the EURASIP Journal of Wireless Communications and Networking Best Paper Award, the UNL College Distinguished Teaching Award, and the Holling Family Master Teacher Award (a UNL University-wide Teaching Award).

June 02, 2010 Wednesday, FENS G032, 13:00 P.M.