Time-invariant representation of discrete periodic systems
A large number of results from linear time-invariant system theory can be extended to periodic systems provided an equivalent time-invariant system can be found. This paper presents a simple and numerically reliable procedure to achieve the same. It is shown that, using a stacked representation of periodic systems, under system equivalence, a minimal-order generalized state-space description can always be obtained.
(1996). Time-invariant representation of discrete periodic systems. Automatica, 32 (2), 267-272.