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Department of Electrical Engineering, University of Ulsan, Namgu, Ulsan 680-749, Korea





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Abstract This paper is concerned with a networked estimation problem in which sensor data are transmitted over the network. In the event-based sampling scheme known as level-crossing or send-on-delta SOD, sensor data are transmitted to the estimator node if the difference between the current sensor value and the last transmitted one is greater than a given threshold. Event-based sampling has been shown to be more efficient than the time-triggered one in some situations, especially in network bandwidth improvement. However, it cannot detect packet dropout situations because data transmission and reception do not use a periodical time-stamp mechanism as found in time-triggered sampling systems. Motivated by this issue, we propose a modified event-based sampling scheme called modified SOD in which sensor data are sent when either the change of sensor output exceeds a given threshold or the time elapses more than a given interval. Through simulation results, we show that the proposed modified SOD sampling significantly improves estimation performance when packet dropouts happen. View Full-Text

Keywords: Networked estimation; event-based sampling; send-on-delta; packet dropout Networked estimation; event-based sampling; send-on-delta; packet dropout





Autor: Vinh Hao Nguyen and Young Soo Suh *

Fuente: http://mdpi.com/



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