Abstract
A decentralized control technique is applied to the problem of periodic output feedback, stabilization or pole-assignment for a periodically time-varying discrete-time system. It is shown that the problem can be reduced to that of stabilizing or pole-assigning a general proper multichannel system by static output feedback on the basis of the equivalence between periodic systems and a class of linear time-invariant systems. The notion of periodic fixed mode is introduced for a periodic system similar to the notion of uncontrollable or unobservable modes. In terms of this notion, both necessary conditions and sufficient conditions for the solvability of the problem are obtained.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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