A New Technique for ARMA-System Identification and Rational Approximation

S. Unnikrishna Pillai, Theodore I. Shim

Research output: Contribution to journalArticlepeer-review


The fundamental problem of identifying a linear time-invariant system, from measured samples of its output response to a known input, is one that impacts on many important fields of interest. Naturally, it has a long and continuing history, but our purpose is to break fresh ground by utilizing a new and simple deterministic theory founded squarely on well-established passive network concepts. Specifically, the present analysis together with documented numerical results demonstrate that the method we propose achieves two essential goals: 1) Stable rational minimum-phase transfer functions can be identified without a priori knowledge of either numerator or denominator degrees. 2) Stable rational minimum-phase Pade-like approximations appear to be generated automatically in the nonrational case. To help substantiate these claims we have included a rather detailed theoretical exposition of the basic ideas, an extensive discussion of numerical results, and a summary of related results.

Original languageEnglish (US)
Pages (from-to)1281-1304
Number of pages24
JournalIEEE Transactions on Signal Processing
Issue number3
StatePublished - Mar 1993

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering


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