Yet another H∞ discretization

A new approach to the conversion of the sampled-data H problem to an equivalent pure discrete-time, lumped-variables counterpart, is presented. The approach is independent of controller causality constraints. In particular, it is applicable to problems, such as preview tracking and fixed-lag smoothing, where existing reduction methods fail. We demonstrate this by solving Open Problem no. 51 from (Blondel et al., 1999).