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Wireless sensor networks (WSNs) are becoming increasingly important because of their reduced cost and a range of real world military applications. The ability to update the code wirelessly is important for their highly dynamic environments. The need to re-program a wireless sensor network may arise from changing application requirements, bug fixes, or during the application development cycle. However,...
Spectrum sensing is a crucial technology for cognitive radio networks. In this paper, we develop a novel spectrum sensing method for secondary users to sense the idle spectrum. The key idea of the proposed method is combining multiple slots energy detection. Firstly, we establish the probability model regarding the appearance of the primary user at each slot of a secondary user slots window structure...
Random key graphs are random graphs induced by the random key predistribution scheme of Eschenauer and Gligor under the assumption of full visibility. For this class of random graphs we show the existence of a zero-one law for the appearance of triangles, and identify the corresponding critical scaling. This is done by applying the method of first and second moments to the number of triangles in the...
Trust management has an important significance on the reliable operation and safety guarantee in Wireless Sensor Networks(WSNs). Previous works were implemented by exchanging key among neighboring sensors. Considering that in many cases, the sensor nodes' behavior is both spatio-temporal correlated, and this paper proposes a reputation model called BRMSN (Behavior Reputation Method for Sensor Networks)...
Critical systems require supervising infrastructures to keep their unreliability under control. We propose safety-critical systems to be modeled through a fault-tolerant architecture based on Stochastic Fault Trees (SFTs) and we refer to a scenario where the monitoring infrastructure is a Wireless Sensor Network (WSN). SFTs associate the failure time of leaf events with a non-Markovian (GEN) cumulative...
According to dramatic increase of wireless communication demand, more spectrum resources are needed to support considerable and various wireless services. However, limited spectrum resources are regulatory assigned to licensed user and no interference needs to occur from unlicensed user to licensed user. In this paper, we propose efficient decision rule in order to get better chance to detect the...
In this paper, we focus on using the sensor network to track a moving target. We estimate the trajectories of moving targets by collecting the information from sensors measurements, and assume that sensors can be randomly moving within a limited radius r. Also assuming each sensor is able to calculate/obtain the distance between itself and the moving target. Here we introduce the modified particle...
The distributed gradient protocol is a common building block to perform several tasks in a wireless sensor network.The gradient calculates the minimum hop-distances between each sensor and a specified set of anchor sensors. This calculation is performed using a distributed greedy forwarding of messages in the network. Several virtual localization protocols use gradients to compute the virtual coordinates...
During the research of supplementary system for visual impairment people, it has been discovered that it is better to use ZigBee wireless technology considering the reliability, portability and flexibility. Through the independent regionally-covered Zigbee networks and the Zigbee terminal with voice prompts, clients will be able to get to the destination correctly and independently according to the...
We analyze large, random network topologies that arise in ad hoc or sensor networks. A fundamental requirement of communication in these systems is reachability, that is, to have a connected network topology. It is known, however, that the price for full connectivity is very high, as it requires unbounded local complexity, i.e., it forces the nodes to have infinitely growing degrees to achieve asymptotic...
The advanced wireless communications such as the sensor networks and ad-hoc networks requires the communications system that is flexible about the transmission power control and robust over multiple access interference. We have showed that the throughput of Code Shift Keying (CSK) random access network is high with the transmission power control. However, it is difficult to use transmission power...
Self-configuring, hierarchical, ad hoc, wireless networks are fast becoming the focus of research for spectral efficiency and energy efficiency reasons. Such networks can be considered as graphs where a node represents a transceiving unit and an edge represents a communication link between two nodes. In order to probabilistically analyse connectedness issues in such graphs, the concept of the star-node...
In this work, the sequential fusion scheme is used to save the energy consumption for events detection in wireless sensor networks (WSNs). The fusion center (FC) sequentially accumulates the information forwarded by nodes, and broadcasts a termination message to stop the transmission of nodes when the accumulated information is enough for decision-making. Thus the average number of forwarded messages,...
This work proposes a distributed sampling design for the signal detection application in the cluster-based wireless sensor networks (WSNs). Considering the energy saving requirement in the cluster-based WSNs, a linear weighting data fusion scheme for data reduction at the cluster head is also developed in this paper. Both the distributed sampling and the data reduction schemes are designed based on...
Node localization is an essential component of many wireless networks. It can be used to improve routing and enhance the security of a network. Localization can be divided into rangefree and range-based algorithms. Range-based algorithms use measurements such as ToA, TDoA, RSS, and AoA to estimate the distance between two nodes. Range-free algorithms are based on proximity sensing between nodes. Although...
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...
Wireless sensor networks are used as an appropriate and efficient approach for controlling and monitoring. The main issues in these networks are saving energy and appropriate sensor covering of environment, so that the link between nodes and final connection of whole network are stable. There are approaches for solving these problems which select subset of nodes in each moment and keep them in active...
This paper will firstly analyze Ditian algorithm and Chi-fu Huang algorithm, pointing out the advantages and disadvantages for both of them, then propose a new algorithm called DSA combining the two algorithms, which can self-adapt its algorithm complexity and communication cost based on the density variation for the nodes in the network.
As heterogeneous wireless sensor networks (WSNs) are being widely deployed for various applications, we are faced with a new challenge of network management for heterogeneous WSNs. On one hand, current available WSN management tools are either application specific, or platform specific, thus suffering from the lack of reusability in heterogeneous WSNs management environment. On the other hand, to...
Localization problems of the WSNs (wireless sensor networks)geostationary nodes are studied,and the localization algorithm (Fast and Rough Nodes Location Algorithm) based on the communication power mediation for geostationary nodes by receiving the localization information from anchor nodes is presented.The localization estimate of localized nodes is executed in lesser field for higher accuracy.The...
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