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An Enhanced DV-Hop for Nodes Localization in Static and Mobile Wireless Sensor Networks

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Localization of sensor nodes is one of the major challenges and a fundamental issue in wireless sensor networks. The data collected by a sensor is meaningless without knowing its geographical location. Several algorithms have been proposed to provide location of sensor nodes and could be classified into two main categories, rangefree and rangebased. Rangebased techniques use absolute measurement of the angle or the distance between the transmitter and receiver; thus, the position of sensor nodes can be calculated using trilateration or triangulation techniques. Range-free techniques use information about the network connectivity. In fact, nodes use the positions of dedicated nodes;named anchors, without measuring distance or angle, and therefore, can only offer estimated nodes locations. This paper focuses on range-free techniques by introducing an enhanced version of DV-Hop, named EDVHop. We have implemented both algorithms in OMNET++ and studied their performance in both static and mobile wireless sensor networks using two mobility models, Random Way Point Mobility and Gross-Markov Mobility. Simulation results show that EDVHop outperforms the DV-Hop algorithm in terms of localization accuracy, the number of localized nodes, and energy consumption.
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MANETS; WSNs; Positioning and Localization Algorithms; Simulations; Performance Evaluation

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