< e1 > H < /e1 > ({infinity} ) controller design for the SISO caseusing a Wiener approach

A solution to the < e1 > H < /e1 > ({infinity}) mixed sensitivity problem for the SISO (single-input single-output) case is obtained using a Wiener approach to parameterize all equalizing and stabilizing controllers. The controller which incorporates the LQG (linear quadratic Gaussian) solution has a structure similar to that of D.C. Youla et al. (1976). The system of equations thus obtained is square and has some degree of advantage over previous solutions