Tracking and disturbance rejection for networked feedback systems under control energy constraint

The optimal tracking and disturbance rejection problem for networked feedback systems is studied in this paper. If there is a disturbance from the sensor to the controller, the performance is to be minimized jointly with the controller design. Two degree of freedom controller is designed to control the system. The reference signal is a step signal. The best performance index for considering tracking limitation is given, which showed the fundamental design limitation and how to avoid the disturbance. The performance limitation is tightly dependent on the nonminimum phase zeros, and the plant gain in the frequency range etc.