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Wireless Networked Control Systems is becoming an important topic in the context of factory automation. In this paper, a workcell is studied where the 802.11 standard is used as the communication protocol. The focus is on the effect of different types of motion on the packet end-to-end delay. OPNET simulations indicate that motion does not violate the delay requirements for the proposed model. Since...
This paper studies a Wireless Networked Control System which utilizes the IEEE 802.11b protocol without modifications to communicate between sensors and actuators in a production line environment. OPNET simulations are used to measure the end-to-end delay from sensor to controller and then from controller to actuator. It is observed that the measured delays, including all types of data processing,...
Real-time detection is an important requirement of many mission-critical wireless sensor network applications such as battlefield monitoring and security surveillance. Due to the high network deployment cost, it is crucial to understand and predict the real-time detection capability of a sensor network. However, most existing real-time analyses are based on overly simplistic sensing models (e.g.,...
We consider the problem of event detection in wireless sensor networks (WSNs) that are large in the sense that an event affects the statistics of the observations of a small number of sensors in the vicinity of where it occurs. An event occurs at a random time at a random location in the region (called the region of interest, ROI) covered by the WSN. We consider a distance based sensing model in which...
The use of sensor systems, with multiple, spatially separated receivers, is ever growing. it is assumed that the propagation delays, from transmitter to receivers, are translated to phase expressions in the frequency domain. We investigate this property and demonstrate the addition of an edge effect. We use signal-to-interference ratio (SIR) notation to quantify this effect and analyze its influence...
Wireless sensor networks consist of a large number sensors spread across a given geographical area. Each sensor has its own communication capability as well as certain level of intelligence for signal processing and networking. As the sensor nodes are densely populated, communication range requirement for these nodes is smaller. After signal detection, a number of sensor nodes communicate over the...
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