Global decentralized control of interconnected nonlinear systems by sampled-data output feedback

This paper studies the problem of global decentralized control for a class of large-scale interconnected uncertain systems using sampled-data output feedback. First, a sampled-data high-gain observer is constructed separately for each subsystem, and an explicit formula of the control law is designed by utilizing the output feedback domination approach. It is shown that by carefully selecting the observer gains and the sampling period, the closed-loop system can be rendered globally asymptotically stable only using decentralized output feedback controller in the discrete-time form.