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IIR Approximation of FIR Filters Via Discrete-Time Hybrid-Domain Vector Fitting

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2 Author(s)
Chi-Un Lei ; Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Kowloon ; Ngai Wong

We present a discrete-time hybrid-domain vector fitting algorithm, called HD-VFz, for the IIR approximation of FIR filters with an arbitrary combination of time-and frequency-sampled responses. The core routine involves a two-step pole refinement process based on a linear least-squares solve and an eigenvalue problem. Through hybrid-domain data approximation and digital partial fraction basis with relative stability consideration, HD-VFz exhibits fast computation and remarkable fitting accuracy in both time and frequency domains.

Published in:

Signal Processing Letters, IEEE  (Volume:16 ,  Issue: 6 )

Date of Publication:

June 2009

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