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In this paper we show that the variance of estimated parametric models for open loop Multiple-Input Multiple-Output (MIMO) systems obtained by the prediction error method (PEM) satisfies a fundamental integral limitation. The fundamental limitation gives rise to a multivariable `waterbed' effect.
In this paper we analyse the strong optimality of open and closed loop experiments. In particular, we establish that when there is a constraint on the system input, then open loop experiments are optimal for a wide class of design criteria. Conversely, we show that when there is a constraint on the output power, then closed loop experiments are optimal for a class of systems and for a wide class of...
We consider feedback performance limitations for modulated and demodulated control systems whose base systems have non-minimum phase (NMP) zeros or unstable poles. We first derive a transfer function for the modulated system and then show how the poles and zeros of this function are related to those of the base system. We next analyse the behaviour of the poles and zeros, when the modulation frequency...
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