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In this work, a new approach is proposed to solve cooperative localization problems in wireless sensor networks for both one-hop and multi-hop cases. To find the unknown positions of randomly distributed sensors with limited power and communication ability, noisy inter-sensor distances and anchor node positions are used. In a plane, when the distances between a sensor and at least three neighbor anchors...
In WSN there is always a scope of improvement in efficient energy utilization, network lifetime. Efficient energy utilization always seems to be an important aspect in WSN's. Because of the fact that energy consumption directly effect the overall performance of WSN. Numbers of protocols are designed for enhancement of network lifetime and prevent the batteries from earlier drainage. Most of the protocols...
This paper focus on multi hop mobility management in WSN ad hoc Network using DVS algorithm for minimum energy consumption. To improve cross layer collaborative in wireless sensor network as well as to improve processing capacity according requirement. In WSN, senor do not only process information at application layer but also synchronize their communication. Using our propose architecture containing...
This paper proposes Efficient & Robust Reprogramming Architecture for Multihop Code Generation in Wireless Sensor Network (WSN) to provide more energy efficient & robust code dissemination protocol for multihop network. Supporting the capability for remote reprogramming of sensor nodes via wireless network has highlighted the importance of research in this area. In this diverse field...
Security is one of the core challenges especially for ICT in disaster Recovery. Sensitive data is transmitted via insecure links. Furthermore, there may be competing interests. Thus, there is a high probability of disturbance or eavesdropping of communication. However, the hierarchical structure of networks in such scenarios can be exploited for security purposes. Based on this, we developed the Topology...
Wireless sensor nodes operating in unlicensed bands can exploit frequency agility in order to mitigate, through dynamic spectrum access, the effects of interference induced by collocated networks. With this respect sensor devices can select the frequency band used for their communications in an opportunistic manner: this however requires spectrum sensing and consumes precious energy when more and...
This paper firstly introduces the architecture of cellular relaying networks, and describes the additional handover scenarios in the networks. Then the handover model of cellular relaying networks is made, the traditional handover algorithm based on absolute threshold value and hysteresis level is introduced. On this basis, we propose a novel handover algorithm based on movement state for cellular...
In this work, to obtain stronger connectivity, we propose and analyze a scheme extended by random key pre-distribution (RKP), which can work only in highly dense networks and require path construction. We investigate the threshold property of multi-hop key connectivity in random geometric networks. We have made use of the Jansonpsilas inequality to deal with the dependency overhead. Accordingly, our...
The performance of code division multiple accesses in sensor networks is limited by multiple access interference (MAI). In this article, we propose a frequency division technique to reduce the MAI in a DS-CDMA sensor network. Our proposal also reduces the energy consumption of the network. In the model, first a new clustering technique is used over several numbers of randomly deployed sensor nodes...
Cooperation spectrum sensing in cognitive radio networks has an analogy to a distributed decision in wireless sensor networks, where each sensor make local decision and those decision result are reported to a fusion center to give the final decision according to some fusion rules. In this paper the performance of cooperative spectrum sensing examines using new optimization strategy to find optimal...
We propose a novel distributed cross-layer optimization approach for cognitive radio wireless networks. A cognitive radio is a wireless device that is capable of sensing the prevailing environmental conditions and automatically adapting its operating parameters in order to enhance the performance of both the system and potentially the whole network. Given the lack of a centralized intelligence to...
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