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In today's network-centric battlefield, the ad hoc style, self-organizing networks play a more and more important role in the operation of mobile forces that are deployed quickly to meet the tactical demands. However, the unique features of the tactical scenario also pose significant challenges for networking, which makes the existing research results for the general mobile ad hoc networks (MANETs)...
In wireless sensor networks, grid-based clustering and routing schemes have attracted considerable attention due to their simplicity and feasibility. In this paper, we adopt a hexagonal tessellation approach and propose a Fast Hexagonal Clustering (FHC) algorithm for efficient data collection. The traffic load is intentionally concentrated at a small portion of Cluster Heads (CHs) and Convergence...
As a fundamental network property, Inter-Contact Time (ICT) determines the critical performance metrics of a vehicular ad-hoc network (VANET). In this paper, we extract the contact information from the traces of Global Positioning System (GPS) from public and semi-public vehicles in a large modern city, including both buses and taxis. By exploring the spatial and temporal properties of the contact...
There exists severe unfairness in the IEEE 802.11 DCF protocol based multi-hop wireless ad hoc networks. We propose a novel fairness enhancement algorithm FDCF based on the adaptive contention window adjustment technique, extensive simulation results show its effectiveness to improve the DCF fairness in wireless ad hoc networks.
Vehicular ad hoc networks (VANETs) are designed to improve traffic safety and efficiency. To this end, the traffic communication must be authenticated to guarantee trustworthiness for guiding drivers and establishing liability in case of traffic accident investigation. Cryptographic authentication techniques have been extensively exploited to secure VANETs. Applying cryptographic authentication techniques...
This paper introduces a novel paradigm for designing the physical and medium access control (MAC) layers of mobile ad hoc or peer-to-peer networks formed by half-duplex radios. A node equipped with such a radio cannot simultaneously transmit and receive useful signals at the same frequency. Unlike in conventional designs, where a node's transmission frames are scheduled away from its reception, each...
In this paper, we present analytical models to study the packets delivery probability on intersections for VANETs(Vehicular ad hoc networks) in city scenarios. These models can help better understand data propagation in this environment. We show that the delivery probability is strongly related to the traffic conditions of the road where the information is to be transmitted. We also validate our analytical...
A challenge in the convergence of heterogeneous networks is how to combine the ubiquitous resources and provide the diversified individual services. By this, the vision of adaptive and context-aware service provision becomes possible and offers new opportunities for pervasive computing. In this paper, we describe an approach that addresses the convergence of wireless personal area and wide area networks...
The problem of find the location of a node in wireless sensor networks has been a research interest in recent years. However, traditional range-based localization methods for wireless sensor networks usually can not achieve high localization accuracy, when the number of labor anchor is less than three. In this paper, we propose a novel range-based distributed localization algorithm based on genetic...
Evolving device capabilities and network technologies make the seamless combination of personal area and wide area networks capable and desirable to exploit advantages of each of the environments. By this, the vision of adaptive and context-aware service provision becomes possible and offers new opportunities for pervasive computing. In this paper, we describe an approach that addresses the convergence...
In this paper, the lower and upper bound of throughput of unslotted CDMA packet networks are considered. A theoretical model for describing multiple access interference (MAI) in unslotted CDMA packet networks is presented, and a novel recursive method for throughput analysis is proposed. Then the lower and upper bound of the throughput are analyzed, respectively. Moreover, the impact of spreading...
Localization is one of the critical tasks of the wireless sensor networks (WSN). Many applications such as environment monitoring, location service and target tracking need the sensors' location. In this paper, we propose a novel range-based distributed localization algorithm - S-MRL (sampling and Malguki refinement localization). Our algorithm is simple and simulation results show our algorithm achieves...
Packet retransmissions due to packet losses reduce transmission performance in wireless networks obviously. Multi-hop wireless networks suffer from packet losses more than one-hop wireless networks. High bit-error rate of wireless channel and frequent channel collision due to shared channel are the most important ingredients of packet loss in multi-hop wireless networks. When bit error rate is between...
In low power ad hoc wireless networks such as sensor network where nodes in the network are powered by battery with limited energy, it becomes critically important to improve the energy efficiency in the routing task in order to prolong the system lifetime. We propose a new model for energy utilization in wireless sensor networks by considering the tradeoff between increased transmission radius and...
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