State space solutions to H/sub infinity / control problems at optimality: full information problem

The standard H/sub infinity / control problem is as follows: given a number gamma >or=0 find all controllers K such that a closed-loop transfer function has H/sub infinity / norm less than or equal to gamma . State-space solutions for the suboptimal (< gamma ) problem were obtained in the work of J.C. Doyle et al. (IEEE Trans. Automatic Control, vol.34, p.831-47, Aug. 1989). These solutions are generalized to the optimal case (>