Abstract
We study asymptotic tracking and rejection of continuous periodic signals in the context of exponentially stabilizable linear infinite-dimensional systems. Our reference signals are in Sobolev-type spaces $H(\omega_n,f_n)$ and they (as well as the disturbance signals) are generated by an infinite-dimensional exogenous system. We show that there exists a feedforward controller which achieves output regulation if and only if the so-called regulator equations are satisfied and a decomposability condition holds. For SISO systems this result allows us to completely answer the question posed in the title: We show that if the stabilized plant does not have transmission zeros at the frequencies $i\omega_n$ of the reference signals, then all reference signals in $H(\omega_n,f_n)$ can be asymptotically tracked in the presence of disturbances if and only if \[ \bigl(H_K(i\omega_n)^{-1}[1-H_d(n)]f_n^{-1}\bigr)_{n \in I} \in \ell^2. \] Here $H_K(i\omega_n)$, $n \in I$, is the transfer function of the stabilized plant evaluated at $i\omega_n$, and $(H_d(n))_{n \in I}$ is a sequence of disturbancecoefficients for the stabilized plant. Moreover, the sequence $(f_n)_{n\in I}$ consists of weights for the Fourier coefficients of the reference signals. We give four examples to illustrate the theory.
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