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Time synchronization is very important in the IEEE802.15.4e network which aim to industrial automation applications. It enabled high end-to-end reliability and low power wireless networking. If an adversary launches time synchronization attacks to the IEEE802.15.4e networks, the whole network communications will be paralyzed. In this paper, we present two types of attacks: 1) ASN and 2) time synchronization...
In the greenhouse environmental monitoring, the wired sensor networks have some problems, for example, complex wiring, inflexible sensor location, cable aging and corrosion and so on. To solve the above problems, we use ZigBee technology to build a wireless sensor network for monitoring temperature, humidity, light intensity, carbon dioxide concentration. And each node is low-power design. Based on...
Time synchronization is very important in many sensor network applications especially in industrial wireless network. If an adversary launches time synchronization attacks to the industrial wireless networks, the whole network communications will be paralyzed. However, the time synchronization is not insufficient to be protected in the current industrial wireless standards which based on IEEE802.15...
An ultra-low power multi-rate FSK transmitter implemented in 0.18 μm CMOS process is presented. A digital frequency interpolator is adopted in the transmitter for achieving multiple data rate transmission. Power consumption of the transmitter is dependent on the required transmitted data rate. Thus, high power efficiency can be achieved. As applying for implantable or wearable biomedical devices,...
In order to save energy of sensors in the process of gathering data and transmitting information, Compressive Sensing (CS), as a novel and effective signal transform technology, has been used gradually in Wireless Sensor Networks (WSNs). In traditional usages of CS techniques in the previous literatures, the sparsities of the signals has to be known beforehand, which is much more importance for their...
The mine accident occurs so frequently. The reliability and Quality of Service (QOS) of underground emergency rescue communication system have decisive function on the rescue achievements. This article brings forward to apply 802.11EDCF protocol in MAC layer to underground emergency rescue communication system by analyzing the influence of 802.11 DCF to QOS system which is based on 802.11b/g network...
In order to solve the problem that the coverage area of ZigBee tree network is restricted by the depth, so that new nodes can not join the network and become a orphan, this paper introduces a project of expanding network coverage area. In this project, through the manual of the button, we can choose a qualified end device to convert to the router configuration, then the device as a router receives...
The intelligent agricultural environment monitoring system is one of the applications of wireless sensor networks (WSNs), which has an extensive application and bright foreground. In the intelligent monitoring system, the gateway is important equipment for realizing the interconnection between WSNs and internet freely. For this purpose, this paper proposes designs and implements a kind of embedded...
To solve the problem that the cluster heads consume a lot of energy in the cluster tree network, a new method which can balance energy consumption and improve the energy utilization ratio is proposed in this paper. This method employs the existed network address resource to select the reserved cluster head. By this method, the convert of network structure which caused by changing cluster head is also...
Barrier coverage is a hot issue in wireless sensor networks for its various applications, such as border surveillance and intrusion detection. In wireless sensor networks, it is a very important problem that how to prolong the network life time. In this paper, we focus on the problem that how to prolong the network lifetime for barrier coverage application. Firstly, the surveillance region is divided...
The design software used in the Matlab interface as the application development platform, and with a SQL Server database as the background data storage tool, in order to achieve efficient human-computer interaction function. From the results of view, the end result meets the design requirements, host computer receives a wireless sensor network module transmission to the temperature, humidity, air...
To connect wireless sensor networks and WiMAX accessing system, a system is proposed in this paper. It is composed of two parts. The first part is used to establish a P2P network of multiple wireless sensor networks (WSNs) named as ??WSN Peer Group (WPG)??. This part is implemented by using JXTA platform. In the WPG, sensor informations can be shared peer to peer by sensor networks. The second part...
According to the actual landform of underground coal mine and the demand of security monitoring, in this paper a coal mine wireless and integrated security monitoring system which combine wireless sensor network and wire monitoring network is proposed. This paper emphasizes a wireless sensor network for coal mine monitoring. In the light of the actual circumstances of coal mine, we propose two-leveled...
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