On discrete spectral factorizations-a unified approach

State-space formulas for all key spectral factorizations appearing in the discrete-time H/sup 2//H/sup infinity / optimization are summarized. The factorization problems are categorized into three groups. Solutions are constructed by finding special coprime factors of a given transfer matrix using the associated discrete algebraic Riccati equation. Solution procedures for the three groups are in general the same, which may lead to yield to a unified approach.<
>