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

Hadjiloucas, S. and Galvao, R. K. H. and Becerra, V. M. and Bowen, J. W. and Martini, R. and Brucherseifer, M. and Pellemans, H. P. M. and Bolivar, P. H. and 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.


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
Keywords:Time-domain spectroscopy, Identification, Space.
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Publisher statement:©2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Record Created:28 May 2008
Last Modified:09 Aug 2011 11:57

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