Efficient decentralized iterative learning tracker for unknown sampled-data interconnected large-scale state-delay system with closed-loop decoupling property

► This paper proposes an efficient decentralized iterative learning tracker. ► The off-line OKID method is used to obtain the decentralized linear models. ► Works for unknown sampled-data interconnected large-scale state-delay systems. ► The system has a closed-loop decoupling property.