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This paper describes a real-time implementation of timestamp-free network synchronization using RF signaling between a master and slave node. Rather than conventional approaches of exchanging digital timestamps through a dedicated synchronization protocol, timestamp-free synchronization is performed implicitly at the physical layer through timing of a master node's responses to a slave node. This...
Real-time networks, such as industrial network, field bus and so on, have been becoming one vital component to develop large-scale and cooperative embedded systems. As one important branch, the wireless mode of realtime networks also raises more and more attentions in recent years since its conveniences to construct a flexible control system. Ethernet Powerlink is such a typical real-time industrial...
This conference note describes a real-time tactical mobile network optimization agent (TNOA) utilizing real-time simulation. By modeling the wired and wireless links in near real time using the massively parallel, high performance network simulator QUALNET we optimize system performance via configuration control. Our heterogeneous tactical network consists of Link 16, Link 11, S-Tadil-J, and JREAP...
In the emerging Internet of Things (IoT), consumer electronics are important components to create a smart environment. Embedded systems, which have internet connectivity in their limited resource, are often equipped with separate MCUs for device control and wireless communication. However, this approach is not cost-effective because of multiple MCUs. To solve this, we propose an IoT framework which...
In this paper we propose a distributed real-time fault detection, isolation and mitigation framework for multiagent systems performing cooperative tasks. Various system models and detection schemes with respect to communication and sensing are considered. Two communication protocols for fault detection are introduced first and proved to be effective. Then a scheme based on limited relative state measurements...
This paper introduces a new scheme on multifunction wireless medical surveillance system based on Radio Frequency (RF), General Packet Radio Service(GPRS) wireless communication protocol and the high performance Field Programmable Gate Array(FPGA) chip. This system receives real-time human physiological parameters such as blood pressure, body temperature, electro cardio signal and pulse and so on...
In wireless sensor networks, battery life is a key resource that must be conserved as much as possible. Nowadays, the main way of achieve power saving in this type of circuits is to implement low-power RF (Radio Frequency) circuitry and network protocols that try to minimize the number of transmissions by the air. We think that adaptation to RF environment can minimize the power consumption and supply...
Wireless communications in the industrial automation world still suffer from lack of standardization. WirelessHART, released in September 2007, is still the only open communication standard specifically designed for real-time process control applications. This paper presents an innovative distributed tool for capturing WirelessHART packets in the field. In fact, even if tools for compliance assessment...
The mining techniques are based on the computer supported cooperative work using a real-time mine-monitoring system. Without this system associated RF wireless network, the safety, and security of mineworkers cannot be understood and ascertained. This paper proposes a mine auxiliary sensor system (MASS) will effectively monitor all situations in mine especially for the safety of mineworkers. The implementation...
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