Complexity of controllers (cyber-physical systems)

What is it about?

The common measure of controller complexity is simply the order of the controller. This can be deceiving, so in this paper, a fundamental measure of controller complexity is proposed which incorporates elements of the memory requirements, number of computations required which may be overlooked by simply using the controller order. A method for determining the controller with the minimum complexity is also proposed and supported by an example.

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Why is it important?

This paper was an early foray into the area of cyber-physical systems before the importance of considering the computing requirements for control systems was widely appreciated.