Title :
Representing externally positive systems through minimal eventually positive realizations
Author :
Claudio Altafini
Author_Institution :
Division of Automatic Control, Dept. of Electrical Engineering, Linkö
Abstract :
In order to investigate the cases in which an externally positive discrete-time system fails to have a minimal positive realization, in this paper we introduce the notion of minimal eventually positive realization, for which the state update matrix becomes positive after a certain power. This property captures the idea that in the impulse response of an externally positive system the state of a minimal realization may fail to be positive, but only transiently. It is shown in the paper that whenever a minimal eventually positive realization exists, then the sequence of Markov parameters of the impulse response admits decimated subsequences for which minimal positive realizations exist and can be obtained by downsampling the eventually positive realization.
Keywords :
"Markov processes","Transfer functions","Eigenvalues and eigenfunctions","Observability","Linear systems","Transient analysis","Solids"
Conference_Titel :
Decision and Control (CDC), 2015 IEEE 54th Annual Conference on
DOI :
10.1109/CDC.2015.7403225