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Sensors 2009, 9(4), 3078-3089; doi:10.3390/s90403078

Networked Estimation for Event-Based Sampling Systems with Packet Dropouts

Department of Electrical Engineering, University of Ulsan, Namgu, Ulsan 680-749, Korea
* Author to whom correspondence should be addressed.
Received: 23 March 2009 / Revised: 21 April 2009 / Accepted: 24 April 2009 / Published: 24 April 2009
(This article belongs to the Section Chemical Sensors)
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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.
Keywords: Networked estimation; event-based sampling; send-on-delta; packet dropout Networked estimation; event-based sampling; send-on-delta; packet dropout
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nguyen, V.H.; Suh, Y.S. Networked Estimation for Event-Based Sampling Systems with Packet Dropouts. Sensors 2009, 9, 3078-3089.

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