Review of LFTs, LMIs, and mu

Abstract

The authors present a tutorial overview of linear fractional transformations (LFTs) and the role of the structured singular value, mu , and linear matrix inequalities (LMIs) in solving LFT problems. The authors first introduce the notation for LFTs and briefly discuss some of their properties. They then describe mu and its connections with LFTs. They focus on two standard notions of robust stability and performance, mu stability and performance and Q stability and performance, and their relationship is discussed. Comparisons with the L/sub 1/ theory of robust performance with structured uncertainty are considered.<>