April 26, 2011
Speaker: Prof. Ephraim Zehavi, Bar-Ilan University, Israel
Part of the joint CS/EE Networking Seminar Series
Modern wireless communication system is operating over multiple frequency selective channels in which users can change their transmission or reception parameters to communicate efficiently by avoiding interference from other users. In the last several years major research effort was concentrated on finding cooperative strategies for allocating radio resources efficiently under system constraints like total power constraint, mask constraints and more. While the single-carrier problems are commonly easily to address, the multi-carrier problems are more complex and have major role in the evolution of future wireless systems based on Orthogonal Frequency Division Multi Access (OFDMA).
In the talk we will outline several cooperative approaches to find agreeable solutions for sharing K frequency bins between N users. The following solutions will be introduced: Nash bargaining solution, the non-symmetric Nash bargaining solution, the Kalai Smorodinsky solution. We will also show that all these solutions can be written as a solution to a weighted max-min problem, where at most N-1 frequency bins have to be shared by more than one user.
Ephraim Zehavi received the B.Sc. and M.Sc. degrees in Electrical Engineering from the Technion - Israel Institute of Technology in Haifa, Israel, in 1977 and 1981, respectively, and the Ph.D. degree in Electrical Engineering from the University of Massachusetts, Amherst in 1986. From 1977 to 1983, he was an R&D engineer and group leader at the Department of Communication, Rafael Armament Development Authority Haifa, Israel. In 1985 he joined QUALCOMM Incorporated, San Diego, CA , where he was involved in the design and development of satellite communication systems, and VLSI design of Viterbi decoder chips. From 1988 to 1992 he was a senior lecture at the Department of Electrical Engineering, Technion-Israel Institute of Technology and also was a consultant for Qualcomm on CDMA technology. In 1992 he rejoined QUALCOMM Incorporated, San Diego. California as a Principal Engineer, where he was involved in the design of PCS CDMA systems. In 1994 he became a VP of Technology and a Project Engineer of the Globalstar system. In 1994, Upon his return to Israel Dr. Zehavi received the title of Assistant General Manager, Engineering in Qualcomm Israel, Ltd, and later become the GM of Qualcomm Israel. In 1998, Dr. Zehavi, initiated a new start up in the area of WLAN, which later was named Mobilian. Mobilan was sold to Intel in 2003. At the end of 2003, he joined the School of Engineering at Bar Ilan, as associated Professor where he is currently leading the Communication track. Zehavi is the co-recipient of the 1994 IEEE Stephen 0. Rice Award and holds more than 40 patents in the areas of coding, CDMA technology, WLAN, and coexistence of multiple wireless networks.