Observer-based H_∞ control for discrete-time stochastic systems with quantisation and random communication delays

In this study, the authors are concerned with the observer-based quantised H_∞ control problem for a class of discretetime stochastic systems with random communication delays. The system under consideration involves signals quantisation, statedependent disturbance as well as random communication delays. The measured output and the control input quantisation are considered simultaneously by using the sector bound approach, while the random communication delays from the sensor to the controller and from the controller to the plant are modelled by a linear function of the stochastic variable satisfying Bernoulli random binary distribution. It is aimed at designing an observer-based controller such that the dynamics of the closed-loop system is guaranteed to be exponentially stable in the mean square, and a prescribed H_∞ disturbance attenuation level is also achieved. Finally, a simulation example is given to illustrate the effectiveness of the proposed method. © The Institution of Engineering and Technology 2013.