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Charla Smart Antennas
Miércoles, 16 de Mayo de 2012 14:27
Martes 22 de Mayo 09:00 horas
Colegio de Ingenieros de Chile A.G.
Av. Santa María 0208, Providencia.
El Capitulo Chileno Conjunto de Antennas & Propagation Society y Communication
Society del IEEE, junto con la Comisión de Telecomunicaciones del Colegio de
Ingenieros de Chile A.G. tienen el agrado de invitarlo a la Conferencia (en inglés) del
Dr. Tapan K. Sarkar, sobre el tema: "Smart Antennas".
Esta conferencia se realizará en conjunto con la Rama IEEE USACH, a las 09:00 horas
del día martes 22 de Mayo, en el Auditorio del Colegio de Ingenieros de Chile A.G.
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Inscripciones: [email protected] Fecha límite para inscripción: viernes 18
de mayo a las 13:00 horas. ENTRADA LIBERADA
Dr. Tapan K. Sarkar
Department of Electrical Engineering and Computer Science
Syracuse University, Syracuse, New York USA
ABSTRACT: The term smart antenna is often used in mobile communications to describe
an adaptive process designed to improve the capacity of a base station by focusing the
radiated electromagnetic energy on transmit while also improving the gain pattern on
receive from a mobile. Here, the transmitted signals from a base station are spatially
directed to an intended mobile.
We present a Direct Data Domain Least Squares (D3LS) approach to estimate the signal
in the presence of jammer interference, clutter and thermal noise. In this technique no
statistical information about the clutter is necessary. Also, since no covariance matrix
needs to be formed in this procedure, the process can be implemented in real time on an
inexpensive digital signal processing (DSP) chip. We also present an extension of this
technique to include traditional statistical processing when dealing with Space Time
Adaptive Processing (STAP). One unique topic in this talk is a multistage analysis
procedure that combines electromagnetic analysis with signal processing. Initially,
electromagnetic principles are applied to compensate for the effects of mutual coupling
between antenna elements, including the effect of nonuniformity in the spacing between
the elements, and the presence of near field scatterers. Then a direct data domain
methodology is implemented to yield the signal of interest. A deterministic model for the
signal of interest yields a lower value for the Cramer-Rao bound than stochastic
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methods. In this approach, no statistical information about the interference environment
is necessary. This makes it possible to perform real time processing in a dynamic
environment. These principles will be illustrated for space-time adaptive processing of
real experimental data obtained from an airborne multi-channel radar system.
TAPAN KUMAR SARKAR (http://web.syr.edu/~tksarkar) received the B. Tech. degree
from the Indian Institute of Technology, Kharagpur, India, in 1969, the M.Sc.E. degree
from the University of New Brunswick, Fredericton, Canada, in 1971, and the M.S. and
Ph.D. degrees from Syracuse University; Syracuse, New York in 1975.
From 1975 to 1976 he was with the TACO Division of the General Instruments
Corporation. He was with the Rochester Institute of Technology, Rochester, NY, from
1976 to 1985. He was a Research Fellow at the Gordon McKay Laboratory, Harvard
University, Cambridge, MA, from 1977 to 1978. He is now a Professor in the Department
of Electrical and Computer Engineering, Syracuse University; Syracuse, NY. His current
research interests deal with numerical solutions of operator equations arising in
electromagnetics and signal processing with application to system design. He obtained
one of the "best solution" awards in May 1977 at the Rome Air Development Center
(RADC) Spectral Estimation Workshop. He has authored or coauthored ten books
including the latest ones "Iterative and Self Adaptive Finite-Elements in Electromagnetic
Modeling" and “Wavelt Applications in Engineering Electromagnetics” which were
published in 1998 and 2002, respectively by Artech House, more than 210 journal articles
and numerous conference papers and has written chapters in 28 books. The book on
“Smart Antennas” will be published by John Wiley in March 2003.
Dr. Sarkar is a registered professional engineer in the State of New York. He received the
Best Paper Award of the IEEE Transactions on Electromagnetic Compatibility in 1979 and
in the 1997 National Radar Conference. He received the College of Engineering Research
Award in 1996 and the chancellor’s citation for excellence in research in 1998 at
Syracuse University. He was elected Fellow of the IEEE in 1991. He was an Associate
Editor for feature articles of the IEEE Antennas and Propagation Society Newsletter, and
he was the Technical Program Chairman for the 1988 IEEE Antennas and Propagation
Society International Symposium and URSI Radio Science Meeting. Currently he is a
distinguished lecturer for the IEEE Antennas and Propagation society. He is on the
editorial board of Journal of Electromagnetic Waves and Applications and Microwave
and Optical Technology Letters. He has been appointed U.S. Research Council
Representative to many URSI General Assemblies. He was the Chairman of the
Intercommission Working Group of International URSI on Time Domain Metrology
(1990-1996). Dr. Sarkar is a member of Sigma Xi and International Union of Radio Science
Commissions A and B. He received the title Docteur Honoris Causa from Universite
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Blaise Pascal, Clermont Ferrand, France in 1998 and the Friends of Clermont Ferrand
award in 2000.
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