Abstract
We define complex-systems of degree n, corresponding to real-systems of degree 2n, whose inputs, outputs, states, and parameters are all complex values. The introduction of such complex-systems makes it more suitable to treat not only the robust control but also the pole assignment in separate regions. The relation between the feedback-control law of the real-system and that of the corresponding complex-system is derived. A feedback-control law to assign all the poles in the prespecified separate regions is determined by using the complex-system.
