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CMMSE: A low-dimensional realization algorithm for periodic input/output behavioral systems
  • José Aleixo,
  • Paula Rocha
José Aleixo
University of Beira Interior

Corresponding Author:[email protected]

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Paula Rocha
University of Porto
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The state-space realization of linear systems is of utmost importance in linear systems theory. After the realization problem for the time-invariant case has been solved, particular attention was paid to the case of linear periodic systems (see, e.g. 1,2,3,4,5,6,7,8). Recently, such systems have regained importance, for instance, in the context of coding theory (see9), where periodic convolutional encoders play an important role, 10. The majority of the contributions within this area concern the realization of transfer functions as well as impulse responses, thus excluding the case of input/output linear systems without coprime representations. By the end of the eighties of the last century, Jan C. Willems (see11,12) suggested an approach (nowadays known as the behavioral approach) that considers a wider class of systems and allows to overcome this drawback. According to this approach, the central object in a system is its behavior which consists of all the signals that satisfy the system laws (also called system trajectories). Consequently, the behavior of a system with an input/output representation that is not coprime, contains more trajectories than the set of input/output signals defined by the system transfer function. Our work takes this fact into account. Based on results already obtained in 13,14, we revisit the problem of the realization of linear periodic MIMO behaviors and give further insight into this problem, which allows setting up an algorithm to compute a low-dimensional state-space realization of a periodic behavior. The proposed algorithm is based on a chain decomposition of suitable matrices.
26 Aug 2022Submitted to Mathematical Methods in the Applied Sciences
27 Aug 2022Submission Checks Completed
27 Aug 2022Assigned to Editor
06 Sep 2022Reviewer(s) Assigned
24 Feb 2023Review(s) Completed, Editorial Evaluation Pending
24 Feb 2023Editorial Decision: Revise Major
15 Mar 20231st Revision Received
20 Mar 2023Submission Checks Completed
20 Mar 2023Assigned to Editor
20 Mar 2023Review(s) Completed, Editorial Evaluation Pending
20 Mar 2023Reviewer(s) Assigned
23 Mar 2023Editorial Decision: Accept