Estimating Capacity of an Interference-limited Cellular Network

SPEAKER: Dr. Andrew J. Viterbi, Presidential Chair Professor of EE-Systems and President, Viterbi GroupABSTRACT: As wide area wireless network usage moves from carrying predominantly voice conversations to a significant percentage being devoted to downloading Internet data traffic, including video, the downlink becomes the more important direction. In a heavily loaded network the dominant limiting factor is the interference from users of neighboring cells. Furthermore, the capacity of transmission to a specific user is position dependent. Treating an idealized model of uniformly distributed users over a multi-cell region, we evaluate the downlink capacity in bits/sec/Hz/sector as an upper bound on the performance of any multiple-access technology.BIO: Dr. Andrew Viterbi is a co-founder and retired Vice Chairman and Chief Technical Officer of QUALCOMM Incorporated. He spent equal portions of his career in industry, having previously co-founded Linkabit Corporation, and in academia as Professor in the Schools of Engineering and Applied Science, first at UCLA and then at UCSD, at which he is now Professor Emeritus. He is currently president of the Viterbi Group, a technical advisory and investment company.His principal research contribution, the Viterbi Algorithm, is used in most digital cellular phones and digital satellite receivers, as well as in such diverse fields as magnetic recording, voice recognition and DNA sequence analysis. More recently, he concentrated his efforts on establishing CDMA as the multiple access technology of choice for cellular telephony and wireless data communication. Dr. Viterbi has received numerous honors both in the U.S. and internationally. Among these are five honorary doctorates, from the Universities of Waterloo (Canada), Rome: Tor Vergata and La Sapienza (Italy), Technion (Israel) and Notre Dame, as well as memberships in the National Academy of Engineering, the National Academy of Sciences and the American Academy of Arts and Sciences. He has received the Marconi International Fellowship Award, the IEEE Alexander Graham Bell and Claude Shannon Awards , the NEC C&C Award, the Eduard Rhein Foundation Award and the Christopher Columbus Medal. He has received an honorary title from the President of Italy and he has served on the U.S. President's Information Technology Advisory Committee.Viterbi serves on boards of numerous non-profit institutions, including the University of Southern California, UC President's Council for the National Laboratories, MIT Visiting Committee for Electrical Engineering and Computer Science, Mathematical Sciences Research Institute, Burnham Institute and the Scripps Research Institute. Host: Dr. Solomon Golomb, x.07333

Location: Ethel Percy Andrus Gerontology Center (GER) - ontology Auditorium

Audiences: Everyone Is Invited

Contact: Mayumi Thrasher