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Universidad de
Oviedo
TSC-UNIOVI
Signal Theory and Communications Group (Grupo de Teora de la Seal y Comunicaciones)
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Project:
INVEMTA
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"INVerse
ElectroMagnetism Techniques with Application to near-field diagnosis, imaging
and location - INVEMTA (Tcnicas de
Electromagnetismo Inverso con Aplicacin al diagnstico, reconstruccin de
geometra y localizacin - INVEMTA)
TEC2008-01638
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 Inverse electromagnetic radiation techniques with
some innovative Near-Field (NF) algorithms and applications and experimental
setups using antenna measurement facilities. Full-wave integral equation
formulations. Source Reconstruction
Method (SRM). Improvements and applications in antenna diagnosis
(probe correction, phase retrieval, determination of safety volumes of
radioelectric stations, super resolution for diagnosis of metamaterial based
antennas).
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 Study of inverse scattering methods based on
integral equation formulation for material characterization, low-contrast
object imaging and arbitrary geometry
imaging and material reconstruction.
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 Cooperative location technique for indoor scenarios based
on the strategy and formulation of the SRM. The influence of obstacles,
number of sensors, multifrequency information and EM noise. Experimental
validation of accuracy and usability study of the algorithms using 802.15.4 PHY link ZigBee network for
Received Signal Strength (RSS) configuration. Multifrequency and phase
information through the integration of appropriate RF multiband transceivers.
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Antenna NF pattern synthesis NF based on data learning
and self-calibration methods. Application to an NF UHF RFID tag reading
system.
 
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  Spectral angular echo cancellation techniques optimization
regarding necessary bandwidth. Support Vector Regression (SVR) techniques implementation
in NF configurations and its extension to the knowledge of only amplitude
information for low-cost measurement ranges.
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 Reflectarrays antennas design using the SRM to
characterize the real feeder. Reflectarray diagnostics. Benchmarking of
reflectarray design techniques.
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  RF/microwave circuitry for practical implementation
of some of the previous tasks: oscillator based multi-carrier transceiver
sensors, compact multiband antennas for the proposed full-wave location
techniques; development of injection-locked harmonic self-oscillating mixer
(HSOM) circuits for their implementation in different types of active
antennas. Nonlinear analysis and optimization techniques for the design of
rationally injection locked oscillators and harmonic balance and transient
envelope simulation.
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