Model reduction using LMIs

This paper treats the problem of approximating an nth order continuous system by a system of order k<n. Optimal solutions minimizing the H/sub /spl infin// norm of the approximation error exist for k=0, n-1. This paper presents an iterative two-step LMI method for improving the H/sub /spl infin// model error compared to Hankel norm reduction.<<ETX>>