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Wireless Sensor Network as an important technology of Internet of things' development, is more and more widely used in various research fields. This paper mainly researches the part of localization application based on wireless sensor network, focuses on DV-Hop localization algorithm, and gives its algorithm simulation and analysis of the simulation results. Also this paper improves the algorithm...
In this paper, we propose binary particle swarm optimization (BPSO) algorithm for distributed node localization in wireless sensor networks (WSNs). Each unknown node performs localization under the measurement of distances from three or more neighboring anchors. The node that gets localized during iteration will be used as a reference for remaining nodes. A comparison of the performances of PSO, basic...
Efficient coverage and energy conservation are two of the primary concerns for area coverage applications of randomly deployed wireless sensor networks. This paper developed a distributed algorithm using range adjustable sensors for maintaining the full coverage of such sensor networks. The algorithm contains two major parts: the first part aims at providing 100% coverage and the second part aims...
IEEE 802.15.4 is a communication standard specifically designed targeting low power personal area networks. It provides MAC and Physical layer specifications for resource constrained networks like Wireless Sensor Networks(WSN). IEEE 802.15.4 MAC specification targets fairness as one of the design considerations. That creates a problem when IEEE 802.15.4 MAC is used for event driven WSN applications...
Wireless Sensor Networks (WSN) which is capable in sensing, storing, processing and transmitting data has been widely applied in providing effective surveillance. Optimum sensor nodes placement in the surveillance area is needed to optimise the cost and efficiency of deployment. The positions of sensor nodes should be able to provide maximum coverage with longer lifetime. This paper proposed a sensor...
The dual orthogonal stereo sensor (DOSS) method uses acoustic waves to determine the distance and direction of an object in an underwater environment. A DOSS system is composed of one acoustic signal generator in the center and four acoustic signal receivers in an orthogonal stereo configuration. In this paper, we propose several algorithms with dual orthogonal stereo sensors that measure the range...
Wireless sensor networks are distributed networks in the way to form wireless self-organization, using a large number of sensor nodes densely deployed in a specific area to monitor external data collection. Positioning accuracy of node becomes the determinants of the data reliability. In this paper, the node of wireless sensor network is located using the algorithm of distribution estimation to enhance...
The localization of nodes is essential for many applications in wireless sensor networks (WSN). Compared with the range-based localization schemes, the range-free ones are more suitable for WSN because of their low-cost and ease for implementation. DV-Hop is considered as one of the pioneering range-free localization methods. In this paper, we propose a new algorithm named Advanced DV-Hop (ADV-Hop)...
Neighbor discovery is an essential step for the self-organization of wireless sensor networks. Many algorithms have been proposed for efficient neighbor discovery. However, most of those algorithms need nodes to keep active during the process of neighbor discovery, which might be difficult for low-duty-cycle wireless sensor networks in many real deployments. In this paper, we investigate the problem...
Connectivity is a crucial performance parameter for wireless multi-hop networks, which is affected by factors like the communication radius, the node density as well as the link quality. In this paper, we solve the critical communication radius problem in wireless multi-hop line networks with unstable links. Specifically, we deduce determinate upper and lower bounds of the critical radius, and validate...
Prolonging lifetime of directional sensor networks is one of the hot topics these days because of vast application of these kinds of sensors. Since, the depletion of energy from one sensor indicates a lack of information being communicated from one part of the network. Hence, managing energy consumption of each sensor becomes critical. In this paper one approach for improving sensor network lifetime...
Target detection is a key application that wireless sensor networks (WSN) support. In order to obtain accurate target detection it is necessary to know the position of all nodes in the network. Therefore positioning algorithms are necessary. This paper aims at evaluating the Maximum Likelihood Estimation algorithm for wireless sensor networks by means of simulation.
This paper presents an analytical method to evaluate the hop-distance relationship for quasi-UDG (Unit Disk Graph) model in wireless sensor network, where sensor nodes are randomly and independently deployed in a circular region by a Poisson process. Different from the UDG model, quasi-UDG model has the non-uniformity property for connectivity. We derive an approximate recursive expression of the...
A method based on positional similarity of received signal strength is introduced to be used in wireless sensor network localization. After the measurement of the received signal strength between nodes, nodes are divided into regions according to certain rules. The beacon node which has the strongest positional similarity to blind node is used as a reference node during the calculation of the blind...
The K-connected deployment and power assignment problem (DPAP) in WSNs aims at deciding both the sensor locations and transmit power levels, for maximizing both the network coverage and lifetime under K-connectivity constraints, in a single run. It is shown that the multi-objective evolutionary algorithm based on decomposition (MOEA/D) is a strong enough tool for dealing with unconstraint real life...
The IEEE 802.15.4 specification has generated a lot of interest in recent times, especially within the Wireless Sensor Network (WSN) research community, primarily because energy efficiency is one of the specifications' design cornerstone. As this specification is relatively new, it is incumbent that its operational mechanisms are well understood, to allow for efficient cross layer interactions between...
Energy efficiency is a critical consideration in the design of low cost sensor networks. This paper studies the problem of extending the lifetime of the sensor networks as far as possible while maintaining the quality of network coverage. A systematical analysis on the relationship between the network lifetime and cover sets alternation is given, and by introducing the concept of time weight factor,...
Collaborative localization and discrimination of acoustic sources is an important problem for monitoring urban environments. Acoustic source localization typically is performed using either signal-based approaches that rely on transmission of raw acoustic data and are not suitable for resource-constrained wireless sensor networks or feature-based methods that result in degraded accuracy, especially...
The nodes of wireless sensor networks (WSNs) have the dual function of gathering information and relaying it to a central collection point, the sink. For the latter function the key is connectivity involving paths over which data is passed from node to node to the sink. We derive connectivity, as expressed by the probability that a node lies on a path to the sink, as a function of the probability...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
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