On the optimal two block H∞ compensators for distributed unstable plants
Smith, Malcolm C.
Tannenbaum, Allen R.
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In this paper we discuss how the optimal compensator can be calculated in H∞ mixed sensitivity minimization problems for a class of unstable distributed systems. An operator theoretic (skew Toeplitz) approach is taken which builds on a framework developed in the previous papers  ,  for calculating the optimal performance. We point out that such an optimal controller, which be infinite dimensional in general can be approximated using the techniques of  to find a corresponding suboptimal finite dimensional compensator.