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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
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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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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.
Keywords: Networked estimation; event-based sampling; send-on-delta; packet dropout Networked estimation; event-based sampling; send-on-delta; packet dropout
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

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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