Static output feedback stabilization of interconnected systems

This paper is concerned with the celebrated static output feedback control problem (SOFP) subject to linear constraints on control input K, e.g. bounds on control magnitude, zeros in some elements of K, etc. These constraints typically arise in the control of resource-limited systems interconnected to each other, where the local control for each system makes use of its own and neighbouring systems´ outputs only, and its magnitude is bounded. This control problem can be approached by a spectral-norm minimization technique (q-SNM), whose preliminary version was previously introduced with little mathematical justification but shown to be promising for the regular SOFP without control constraints. This paper mathematically justifies q-SNM by showing its explicit relationship with spectral radius, and extends q-SNM to accommodate various linear control constraints.