Accessibility navigation


Comparison of subspace and ARX models of a waveguide's terahertz transient response after optimal wavelet filtering

Hadjiloucas, S., Galvao, R. K. H., Becerra, V. M., Bowen, J. W., Martini, R., Brucherseifer, M., Pellemans, H. P. M., Bolivar, P. H., Kurz, H. and Chamberlain, J. M. (2004) Comparison of subspace and ARX models of a waveguide's terahertz transient response after optimal wavelet filtering. Ieee Transactions on Microwave Theory and Techniques, 52 (10). pp. 2409-2419. ISSN 0018-9480

Full text not archived in this repository.

To link to this article DOI: 10.1109/tmtt.2004.835983

Abstract/Summary

A quasi-optical deembedding technique for characterizing waveguides is demonstrated using wide-band time-resolved terahertz spectroscopy. A transfer function representation is adopted for the description of the signal in the input and output port of the waveguides. The time-domain responses were discretized and the waveguide transfer function was obtained through a parametric approach in the z-domain after describing the system with an AutoRegressive with eXogenous input (ARX), as well as with a state-space model. Prior to the identification procedure, filtering was performed in the wavelet domain to minimize both signal distortion, as well as the noise propagating in the ARX and subspace models. The optimal filtering procedure used in the wavelet domain for the recorded time-domain signatures is described in detail. The effect of filtering prior to the identification procedures is elucidated with the aid of pole-zero diagrams. Models derived from measurements of terahertz transients in a precision WR-8 waveguide adjustable short are presented.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Systems Engineering
ID Code:15247
Uncontrolled Keywords:identification algorithms, multimode waveguide characterization, signal, processing, terahertz spectroscopy, TIME-DOMAIN SPECTROSCOPY, IDENTIFICATION, SPACE

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation