Aleixo, JoséRocha, Paula2020-02-052020-02-052017http://hdl.handle.net/10400.6/9039In this paper we consider 2D single-input/singleoutput behaviors described by linear partial difference equations with (2,2)-periodically varying coefficients, and present a method to obtain 2D Roesser state-space representations (or realizations) for such behaviors. Since these cannot be obtained by separately realizing each shift-invariant system resulting from “freezing” the varying coefficients, we propose a method based on the realization of an invariant input/output behavior obtained by suitably “lifting” the trajectories of the original periodic behavior.engRoesser model representation2D periodic behaviorsjournal article10.1109/NDS.2017.8070617