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In future wireless communicstions, smart antenna based systems
will be most promising for broadband wireless access. The
main benifits that can be achieved with smart antennas are
increase of system capacity and coverage, improvement of signal
quality resulting higher data rates, new services based on
spatial information and reduction of transmit power. Three
main approaches of smart antennas may be defined: switched
beams, dynamically phased array (or direction finding) and
adaptive array (or optimum combining). In these approaches,
two main functions are direction-of-arrival (DOA) estimation
and beamforming. Moreover, the broadband signals will be used
for the requirement of future high-data-rate applications
(multimedia, broadcasting, etc.). Wideband and ultra-wideband
applications are proposed for fractional bandwidth (ratio
of bandwidth to center frequency) up to 50-200%. This paper
summarizes the smart antenna approaches and presents new methods
for wideband DOA estimation and wideband beamforming. New
method for design of digital beamforming using spatial interpolation
will be also presented.
Biography
Peter Russer received his Dipl.-Ing. degree in 1967 and his
Dr. techn. degree in 1971, both in electrical engineering
and both from the Technische Universität Wien, Austria,
where he was Assistant Professor from 1968 to 1971. In 1971
he joined the Research Institute of AEG-Telefunken in Ulm,
Germany, where he worked on fiber optic communication, broadband
solid-state electronic circuits, statistical noise analysis
of microwave circuits, laser modulation and fiber optic gyroscopes.
In 1979 he was co-recipient of the NTG Award for the publication
"Electronic Circuits for High Bit Rate Digital Fiber
Optic Communication Systems" Since 1981 he has been professor
and head of the Institute of High Frequency Engineering at
the Technische Universität München, Germany. In
1990 he has been Visiting Professor at the University of Ottawa,
and in 1993 he has been Visiting Professor at the University
of Victoria. From October 1992 through to March 1995 he was
director of the Ferdinand-Braun-Institut für Höchstfrequenztechnik,
Berlin/Germany. In 1994 he was elected to the grade of Fellow
of the IEEE for fundamental contributions to noise analysis
and low-noise optimization of linear electronic circuits with
general topology.
He has served as a member of the technical programme committees
and steering committees of various international conferences
(IEEE MTT –S, European microwave Conference and as the
member of the editorial board of several international journals
(Electromagnetics, International Journal of Numerical Modeling).
He is Co-Chairman of U.R.S.I. Commission D.
His current research interests are electromagnetic fields,
integrated microwave and millimeter-wave circuits, statistical
noise analysis of microwave circuits, and methods for computer-aided
design of microwave circuits. Peter Russer is author of more
than three hundred scientific papers in these areas. He is
Fellow of the IEEE, member of the German Informationstechnische
Gesellschaft (ITG) and the German as well as the Austrian
Physical Societies. |
