EECS CSPL SEMINAR SERIES
FALL TERM 1999


Nader Moayeri

Dr. Nader Moayeri

Wireless Communications Technologies Group

National Institute of Standards and Technology

Gaithersburg, MD

moayeri@nist.gov



Wednesday, November 3
1:30 - 2:30 P.M.
Room 1311 EECS


PART I: An overview of NIST Wireless Communications Technologies Group
PART II: A framework for throughput and stability analysis of a DS-CDMA network

Abstract-
This seminar consists of two parts. In Part I, we give an overview of the activities of the Wireless Communications Technologies Group at the National Institute of Standards and Technology. We describe the groupÕs mission, history, and activities on four wireless communications technologies, namely, third-generation (3G) wireless systems, mobile ad hoc networks, local multipoint distribution service, and picocellular wireless systems.

In Part II, we propose a framework for throughput and stability analysis of a Direct Sequence Code Division Multiple Access (DS-CDMA) network. Given chip rate, processing gains, packet structure, coding scheme, and the characteristics of the wireless channel, we derive a system of non-linear fixed point equations for the sustainable link bit rates. The dimension of this system is equal to the number of network nodes receiving transmissions from other nodes. Generally, this non-linear system may have multiple locally stable solutions, which indicate a possible instability of the DS-CDMA network. As an example, we consider throughput and stability of the reverse link in a cellular system, i.e., from mobiles to the base station. A reverse link is described by a single fixed point equation regardless of the number of mobiles.



Biosketch-
Nader Moayeri was born in Hamadan, Iran, on August 31, 1956. He studied electrical engineering at Sharif University of Technology, Tehran, Iran, from 1974 to 1978. He received the MSEE, MSCICE, and Ph.D. in Electrical Engineering-Systems from the University of Michigan, Ann Arbor, Michigan, in 1980, 1981, and 1986, respectively.
From 1986 to 1994, he was with the Department of Electrical and Computer Engineering at Rutgers, The State University of New Jersey. From 1994 to 1997, he was with the Imaging Technology Department at Hewlett-Packard Laboratories, Palo Alto, CA. Since September 1997, he has been with the National Institute of Standards and Technology, Gaithersburg, MD. At NIST, he is the Manager of the Wireless Communications Technologies Group, which he built during 1997-98. Dr. Moayeri's research interests are in data compression, mobile radio communications, information theory, and routing and flow control in data networks. He served the Princeton/Central Jersey Section of the IEEE in various capacities, among which was Section Chair (1992-93) and founder and first Chairman (1989-93) of the Information Theory Society Chapter. He was a Co-Chairman of the Joint DIMACS/IEEE Workshop on Coding and Quantization, held at Rutgers University in October 1992.



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