Parameter-dependent Robust H_∞ Filter Design for Uncertain Discrete-time Systems with Quantized Measurements

摘要

This paper deals with the problem of parameter-dependent robust H_∞ filter design for uncertain discrete-time systems with output quantization. The uncertain parameters are supposed to reside in a polytope. The system outputs are quantized by a memoryless logarithmic quantizer before being transmitted to a filter. Attention is focused on the design of a robust H_∞ filter to mitigate quantization effects and ensure a prescribed H_∞ noise attenuation level. Via introducing some slack variables and using the parameter-dependent Lyapunov function, sufficient conditions for the existence of a robust H_∞ filter are expressed in terms of linear matrix inequalities (LMIs). Finally, a numerical example is provided to demonstrate the effectiveness of the proposed approach.