ℌ∞ Filtering of Lipschitz nonlinear systems with network-induced uncertain delays

In this paper, a filter design scheme is proposed for Lipschitz nonlinear systems with delays. It is assumed that the measurements are transmitted through a communication network and therefore reach the filter with an uncertain delay. The design methodology is formulated as an optimization problem with LMI constraints, which are derived using a less conservative Lyapunov-Krasovskii function and establish an ℌ_∞ attenuation level on the effects of the unwanted exogenous inputs on the estimation error. Simulation results are given to illustrate the effectiveness of the proposed filter.