Characterizations of rectangular (para)-unitary rational functions Academic Article uri icon


  • Abstract: We here present three characterizations of not necessarily causal, rational functions which are (co)-isometric on the unit circle:(i) Through the realization matrix of Schur stable systems.(ii) The Blaschke-Potapov product, which is then employed to introduce an easy-to-use description of all these functions with dimensions and McMillan degree as parameters.(iii) Through the (not necessarily reducible) Matrix Fraction Description (MFD).

publication date

  • October 1, 2014