Ephraim Zehavi, School of Engineering, Bar Ilan University
Time: 11:30 AM, Friday, September 30th, 2005.
Place: Room 202, ECE Center, New Jersey Institute of Technology, Newark NJ. Directions

Abstract

The integration of Cellular networks and WLAN networks enables them to increase their capacity and the services of both networks. The two networks possess complementary features. On one hand, cellular networks provide wide area coverage at medium data rate and enables connectivity to mobile devices. On the other hand the cellular network provides poor coverage for indoor subscribers. The WLAN networks provide local coverage of indoor with high data rate. Two approaches to integrate the networks were proposed in the literature; tightly coupled approach and loosely coupled approach.  In this discussion we propose a third approach titled dual coupling approach.  The dual coupling approach simplifies the integration of the two networks and provides seamless handoff. The proposed approach increases the capacity of the cellular network by four times for most typical situations, due to the use of WLAN resources for voice services. In addition, the QOS of the voice service increases.

Biography

Dr Zehavi is a well-known technical authority in the area of wireless communications and digital communications. 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 faculty member at the Department of Electrical Engineering, Technion-Israel Institute of Technology and also consulting 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. Professor. Zehavi  is the co-recipient of the 1994 EPEE Stephen 0. Rice Award and holds more than 40 patents in the areas of coding, CDMA technology, WLAN, and coexistence of multiple wireless networks.