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301 405 3596
Re-configurable Directional Wireless Networks
Dr. Christopher C. Davis
Professor, Electrical and Computer Engineering, Univ. of Maryland
February 29, 2008, 2:00 p.m.
Jeong H. Kim Engineering Building, Rm. 1110
Directional wireless communication offers bandwidths, ranges, security, and efficiency that far exceed those of omni-directional broadcast wireless. Directional wireless networks are also far more scalable than broadcast networks. This talk will address some of the key technological issues relevant to the design and operation of what are called D-MANETs (Directional Mobile Ad-Hoc Networks) in contrast to omni-directional (O-MANETs). D-MANETs use free space optical (FSO) and RF links and must handle obscuration, such as fog, clouds, snow, and rain, as well as the challenges of pointing, acquisition, and tracking (PAT) that are required to keep the directional beams pointing from a given transmitter to a given receiver. D-MANETs also allow for autonomous re-configuration (topology control) in response to link states and network traffic demands. Some of the specific topics that will be discussed include node location, beam steering, and optimal placement of nodes to handle network edge O-MANET clusters.
Christopher C. Davis is Professor of Electrical and Computer Engineering at the University of Maryland, College Park. He received the B.A. degree (with Honors) in Natural Sciences from the University of Cambridge in 1965, the M.A. degree from the University of Cambridge in 1970, and the Ph.D. degree in Physics from the University of Manchester in 1970. From 1973-1975 he was a Instructor/Research Associate at Cornell University, and from 1982-83 was a Senior Visiting Fellow at the University of Cambridge. He has been a recipient of the following Honors and Awards: University of Maryland Distinguished Scholar-Teacher, 1989-90; Fellow of the Institute of Physics, 1989; AT&T/ASEE Award for Excellence in Engineering Education,1990; Fellow of the IEEE, 1993; Invention of the Year Award in Information Technology, University of Maryland, 2000. Professor Davis is the author of the widely used text “Lasers and Electro-Optics,” published by Cambridge University Press, and co-author with Jack Moore and Mike Coplan of the best selling text “Building Scientific Apparatus,” soon to be published in its 4th edition by Cambridge University Press.
He is also author or co-author of 13 chapters in books, over 170 refereed journal articles and over 250 conference papers, and is the holder of nine awarded and several pending patents. He is Conference co-Chair of the SPIE Free Space Laser Communications Conference, and is a frequent invited lecturer both nationally and internationally.
He has served as a scientific consultant to several US Government agencies and industry. He is a member of the IEEE Standards Coordinating Committee SCC-34 SC2, which deals with RF exposure from wireless devices.
Currently active research includes optical and RF directional wireless, real-time advanced surveillance systems with “event” detection, the optical properties of nanostructures where surface plasmons can be excited, near-field scanning optical microscopy, laser interferometry, dielectrometry, fiber sensors and biosensors, magnetooptics, optical trace detection, atmospheric turbulence, optical communication systems and devices, and biophysics.
His past research has covered gas lasers, photon counting, chemical lasers, molecular relaxation processes, diode-pumped solid-state lasers, laser noise and instabilities, injection locking of broad area laser diodes, nonlinear imaging of ferroelectric and ferromagnetic materials, and studies of the biological effects of non-ionizing radiation.
Professor Davis teaches regularly at both the undergraduate and graduate levels. He teaches basic circuit theory, electromagnetics, optical system design, lasers, quantum mechanics, and quantum electronics. He has also taught on a number of occasions a general interest course for Honors freshmen entitled “The Light Fantastic: Light, Optics, and Lasers.”
Faculty Host: Dr. Reza Ghodssi
This Event is For: Public • Campus • Clark School