Research in Wireless Multiuser Communication Networks

Abstract

In this talk,several issues that arise in Multiuser Communication Networks and Wireless Mobile Communication Networks are addressed,and some novel results developed by the speaker and his students over the recent years are presented.  The first topic is the efficient multiuser accessing of a common channel, when there is no centralized control,and no dedicated channel for each user.  The original ALOHA random access algorithm has been improved towards stable,high throughput alternatives,that can also accomodate multimedia users,having different priority constraints.More recently,research in multichannel CDMA with random access algorithms has been very important in Wireless Networking.  The second topic is the efficient modelling of data traffic in networks.

Two competing models are presently considered useful: 1)Markov Modulated Point Processes; 2)Self Similar Processes.  For the first class of models,we present a novel,adaptive algorithm for learning the parameters of the process in real time,so that effective adaptive routing algorithms can be uitlized to react to unknown traffic.

New expressions for the blocking probability for the above traffic models are presented.   Finally,the issue of monitoring the traffic pattern and quick detection of sudden changes is discussed.Real time monitoring algorithms are presented,and their performance discussed.

Dr. Demetrios Kazakos received his Diploma in Electrical and Mechanical Engineering from the National Technical University of Athens, Greece, his Master Degree in Electrical Engineering from Princeton University, and his Ph.D. Degree in Electrical Engineering/Communications from the University of Southern California.  He has extensive research and teaching experience in the area of Information Technology and Telecommunications.He has been a faculty member for 25 years in the State University of New York at Buffalo,University of Virginia and University of Southwestern Louisiana.He has published 2 books,about 55 refereed journal papers and 95 conference proceedings papers,in the areas of Communications,Statistical Signal Processing,Wireless Communications and Networking,and related areas.  He was elected Fellow of the Institute of Electrical and Electronics Engineers,and Distinguished Lecturer of the IEEE Communication Society.  He has been the technical program chair for several Telecommunication conferences,including the Wireless Communications and Networking Conference of 2000.

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