On H/sup infinity /-control for symmetric systems

Results regarding H/sup infinity / control for symmetric systems are introduced. It is shown that in order to find the compensator, only one nonlinear matrix equation has to be solved, instead of two Riccati equations as in the general case. A numerically robust algorithm for the solution of the equation introduced is presented. The compensator obtained is also shown to be symmetric. Some considerations concerning the so-called normalized H/sup infinity / control problem are outlined.<<ETX>>