Abstract-In this paper, the distributed filtering problem is investigated for a class of discrete time-varying systems with an event-based communication mechanism. Each intelligent sensor node transmits the data to its neighbors only when the local innovation violates a predetermined Sendon-Delta (SoD) data transmission condition. The aim of the proposed problem is to construct a distributed filter for each sensor node subject to sporadic communications over wireless networks. In terms of an event indicator variable, the triggering information is utilized so as to reduce the conservatism in the filter analysis. An upper bound for the filtering error covariance is obtained in form of Riccati-like difference equations by utilizing the inductive method. Subsequently, such an upper bound is minimized by appropriately designing the filter parameters iteratively, where a novel matrix simplification technique is developed to handle the challenges resulting from the sparseness of the sensor network topology and filter structure preserving issues. The effectiveness of the proposed strategy is illustrated by a numerical simulation.Index Terms-Distributed filtering, wireless sensor networks, eventbased mechanism, Send-on-Delta concept.

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SrTi0.3Fe0.7−xCoxO3−δ oxygen electrodes provide a unique combination of low polarization resistance and stability useful for solid oxide electrochemical cells.

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In this paper, the H∞ consensus control problem is investigated over a finite horizon for general discrete time-varying multi-agent systems subject to energy-bounded external disturbances. A decentralized estimation-based output feedback control protocol is put forward via the relative output measurements. A novel event-based mechanism is proposed for each intelligent agent to utilize the available information in order to decide when to broadcast messages and update control input. The aim of the problem addressed is to co-design the time-varying controller and estimator parameters such that the controlled multiagent systems achieve consensus with a disturbance attenuation level γ over a finite horizon [0, T ]. A constrained recursive Riccati difference equation approach is developed to derive the sufficient conditions under which the H∞ consensus performance is guaranteed in the framework of event-based scheme. Furthermore, the desired controller and estimator parameters can be iteratively computed by resorting to the MoorePenrose pseudo inverse. Finally, the effectiveness of the developed eventbased H∞ consensus control strategy is demonstrated in the numerical simulation.Index Terms-Multi-agent systems; event-based mechanism; H∞ consensus; Riccati difference equation; output feedback.

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