Hindawi Publishing

Displaying 1-40 of 1569 results

  • White Papers // Jun 2010

    Layered Video Transmission on Adaptive OFDM Wireless Systems

    Future wireless video transmission systems will consider Orthogonal Frequency Division Multiplexing (OFDM) as the basic modulation technique due to its robustness and low complexity implementation in the presence of frequency-selective channels. Recently, adaptive bit loading techniques have been applied to OFDM showing good performance gains in cable transmission systems. In...

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  • White Papers // Feb 2010

    Wireless Network Algorithms, Systems, and Applications

    Advances in wireless communication and networking technologies proliferate ubiquitous infrastructure and ad hoc wireless networks, enabling a wide variety of applications ranging from environment monitoring to health care, from critical infrastructure protection to wireless security, to name just a few. The complexity and ramifications of the fast-growing number of mobile...

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  • White Papers // Mar 2015

    A Novel IKP-Based Biometric Recognition Using Mobile Phone Camera

    In this paper, the authors explore an Inner-Knuckle-Print (IKP) biometric recognition, based on mobile phone. Since IKP characteristics are captured by using mobile phone camera, the greatest challenge is that IKP images from the same hand have different illumination, posture and background. In order to construct autonomous and robust recognition,...

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  • White Papers // Feb 2014

    Mobile Applications for Knowledge Workers and Field Workers

    In recent years, the diffusion of mobile applications (mobile apps) has risen significantly. Now-a-days, mobile business apps are strongly emerging in business, enhancing productivity and employees' satisfaction, whilst the usage of customized individual enterprise apps is still an exception. Standardized business apps enable basic functionalities, for example, mobile data storage...

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  • White Papers // Sep 2014

    Server-Aided Verification Signature with Privacy for Mobile Computing

    With the development of wireless technology, much data communication and processing has been conducted in mobile devices with wireless connection. As everyone knows that the mobile devices will always be resource-poor relative to static ones though they will improve in absolute ability, therefore, they cannot process some expensive computational tasks...

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  • White Papers // Mar 2015

    On the Effect of Different Grips of Handsets on Data Rate in the Measured Channels

    The investigation on the achieved data rate of the cellular system considering different grips of handsets at different frequencies using measurement results of the measurement campaign - which was carried out in the city of Aalborg - is presented in this paper. The achieved data rate of the Multiple-Input Single-Output...

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  • White Papers // Feb 2015

    Acoustic Self-Calibrating System for Indoor Smart Phone Tracking

    In this paper, the authors present an acoustic indoor localization system for commercial Smartphones that emit high pitched acoustic signals beyond the audible range. The acoustic signals with an identifier code modulated on the signal are detected by self-built receivers which are placed at the ceiling or on walls in...

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  • White Papers // Aug 2010

    Securing Embedded Smart Cameras With Trusted Computing

    Camera systems are used in many applications including video surveillance for crime prevention and investigation, traffic monitoring on highways or building monitoring and automation. With the shift from analog towards digital systems, the capabilities of cameras are constantly increasing. Today's smart camera systems come with considerable computing power, large memory,...

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  • White Papers // Aug 2011

    Alert: An Adaptive Low-Latency Event-Driven MAC Protocol for Wireless Sensor Networks

    Collection of rare but delay-critical messages from a group of sensor nodes is a key process in many wireless sensor network applications. This is particularly important for security-related applications like intrusion detection and fire alarm systems. An event sensed by multiple sensor nodes in the network can trigger many messages...

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  • White Papers // Jan 2012

    Optimal Resource Allocation and VCG Auction-Based Pricing for H.264 Scalable Video QualityMaximization in 4G Wireless Systems

    The authors present novel schemes for optimal OFDMA bit-rate allocation towards video quality maximization in H.264 Scalable Video Coding (SVC)-based 4G wireless systems. They use the rate and quality models for video characterization of the SVC extension of the H.264/AVC and develop the framework for optimal scalable video transmission. Subsequently,...

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  • White Papers // Mar 2012

    Hybrid Position-Based and DTN Forwarding for Vehicular Sensor Networks

    Efficient data delivery in vehicular sensor networks is still a challenging research issue. Position-based routing protocols have been proven to be more suitable for dynamic vehicular networks or large-scale mobile sensor networks than traditional ad hoc routing protocols. However, position-based routing assumes that intermediate nodes can always be found to...

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  • White Papers // Dec 2011

    Exploiting the Burstiness of Intermediate-Quality Wireless Links

    The authors address the challenge of link estimation and routing over highly dynamic links, that is, bursty links that rapidly shift between reliable and unreliable periods of transmissions. Based on significant empirical evidence of over 100,000 transmissions over each link in 802.15.4 and 802.11 test-beds, they propose two metrics, Expected...

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  • White Papers // Feb 2010

    Resource Allocation for the Multiband Relay Channel: A Building Block for Hybrid Wireless Networks

    The authors investigate optimal resource allocation for the multiband relay channel. They find the optimal power and bandwidth allocation strategies that maximize the bounds on the capacity, by solving the corresponding max-min optimization problem. They provide sufficient conditions under which the associated max-min problem is equivalent to a supporting plane...

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  • White Papers // Sep 2012

    A Secure Cluster Formation Scheme in Wireless Sensor Networks

    In this paper, the authors proposed a cluster formation scheme, which generates large-sized clusters in a secure manner. Their scheme initially produces large sized clusters and preserves them using the two-hop conformity verification. Then, their scheme merges the cluster formation initiators into clusters only when they conform to the cluster...

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  • White Papers // Aug 2012

    Cooperative Group Localization Based on Factor Graph for Next-Generation Networks

    In this paper, the WFG-CGL algorithm and the LCFGCGL algorithm are proposed in ill conditions. Especially for WFG-CGL algorithm, the weights based on the information reliability are incorporated into the algorithm in order to obtain higher localization accuracy. The corresponding analysis and simulations show that the proposed algorithms can relax...

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  • White Papers // Aug 2012

    Toward Intelligent Intrusion Prediction for Wireless Sensor Networks Using Three-Layer Brain-Like Learning

    The intrusion prediction for Wireless Sensor Networks (WSNs) is an unresolved problem. Hence, the current intrusion detection schemes cannot provide enough security for WSNs, which poses a number of security challenges in WSNs. In many mission critical applications, such as battle field, even though the Intrusion Detection Systems (IDSs) without...

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  • White Papers // Aug 2012

    Wireless Multiple Access and Analog Oscillation Analysis in Microgrids: A Prony Approach

    A key challenge in smart grid is to monitor the system modal characteristics of disturbance over a microgrid for system stability and diagnosis. The measurements at different Phasor Measurement Units (PMUs) need to be reported to a processing center. Therefore, a multiple access scheme for wireless transmission is necessary to...

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  • White Papers // Sep 2012

    Two-Layer Storage Scheme and Repair Method of Failure Data in Wireless Sensor Networks

    Distributed data storage is a key technology in the data collection in wireless sensor networks. The storage scheme based on network coding is applied to data collection in wireless sensor networks because of its high reliability and low overhead. However, it is an open problem to reduce data repair communication...

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  • White Papers // Mar 2012

    Parlay X Web Services for Policy and Charging Control in Multimedia Networks

    The paper investigates the capabilities of Parlay X Web Services for Policy and Charging Control (PCC) in managing all Internet protocol-based Multimedia networks (IMSs). PCC is one of the core features of evolved packet networks. It comprises flow-based charging including charging control and online credit control, gating control, and Quality...

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  • White Papers // Oct 2011

    Energy-Efficient Multi-Job Scheduling Model for Cloud Computing and Its Genetic Algorithm

    For the problem that the energy efficiency of the cloud computing data center is low, from the point of view of the energy efficiency of the servers, the authors propose a new energy-efficient multi-job scheduling model based on Google's massive data processing framework. To solve this model, they design a...

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  • White Papers // Sep 2012

    Application-Oriented Fault Detection and Recovery Algorithm For Wireless Sensor and Actor Networks

    Recent years have witnessed a growing interest in applications of Wireless Sensor and Actor Networks (WSANs). In WSANs, maintaining interactor connectivity is of vital concern in order to reach application level. Failure of a critical actor may partition the inter-actor network into disjoint segments. This paper proposed an Application-oriented Fault...

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  • White Papers // Dec 2011

    Improving Streaming Capacity InMulti-Channel P2P VoD Systems Via Intra-Channel and Cross-Channel Resource Allocation

    Multi-channel Peer-To-Peer (P2P) Video-on-Demand (VoD) systems can be categorized into independent-channel P2P VoD systems and correlated-channel P2P VoD systems. Streaming capacity for a channel is defined as the maximal streaming rate that can be received by every user of the channel. In this paper, the authors study the streaming capacity...

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  • White Papers // Feb 2010

    Optimal Superimposed Training Sequences for Channel Estimation in MIMO-OFDM Systems

    In this paper an iterative time domain Least Squares (LS) based channel estimation method using Superimposed Training (ST) for a Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system over time varying frequency selective fading channels is proposed. The performance of the channel estimator is analyzed in terms of...

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  • White Papers // Jan 2012

    An Adaptive System Supporting Collaborative Learning Based on a Location-Based Social Network and Semantic User Modeling

    In this paper, the authors present an adaptive e-learning system which supports collaborative learning based on a location-based social network and semantic modeling. In the system, a social network among e-learning learners is dynamically constructed on the basis of the location information of learners using GPS sensors for collaborative learning....

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  • White Papers // Nov 2011

    Impact of Mobility on Routing Energy Consumption in Mobile Sensor Networks

    Mobility in mobile sensor networks causes frequent route breaks, and each routing scheme reacts differently during route breaks. It results in a performance degradation of the energy consumption to reestablish the route. Since routing schemes have various operational characteristics for rerouting, the impact of mobility on routing energy consumption shows...

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  • White Papers // Jan 2012

    A Distributed Reclustering Hierarchy Routing Protocol Using Social Welfare in Wireless Sensor Networks

    Wireless Sensor Networks (WSNs) are capable of sensing physical or environmental conditions, such as motion, pressure, and images of the environment, as well as seismic, electromagnetic, and acoustic waves. Sensor nodes form an ad hoc network within the target field, routing data packets to a specified center(s). For example, sensors...

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  • White Papers // Jan 2012

    Energy-Efficient Secure Path Algorithm for Wireless Sensor Networks

    To collect the data and transmit them on the base station is the main task of the sensor nodes in Wireless Sensor Networks (WSNs). This transmission requires a specific routing algorithm. To prolong the network lifetime, sensor nodes need a secure load-balancing route. In this paper, the authors investigate the...

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  • White Papers // Feb 2012

    Energy Efficient MAC Protocol for Low-Energy Critical Infrastructure Monitoring Networks Using Wakeup Radio

    Critical infrastructure monitoring applications are rapidly increasing. Application requirements include reliable data transfer, energy efficiency, and long deployment lifetime. In this paper, the authors present a Medium Access Control (MAC) protocol for Low-Energy Critical Infrastructure Monitoring (LECIM) applications. The proposed MAC protocol is based on a framed slotted aloha multiple...

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  • White Papers // Dec 2011

    Multichannel Communications in Wireless Automation: Interdependencies Between Communication and Control Parameters

    Exploitation of wireless communications in various automation applications brings indisputable benefits, which has proliferated research efforts in the field during the recent years. In this paper, the authors study how different communication parameters, such as packet arrival rate, number of channels, and packet size, affect the performance of control systems....

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  • White Papers // Jan 2012

    Energy-Efficient Fire Monitoring Over Cluster-Based Wireless Sensor Networks

    Uncontrolled fires occurring in wild areas cause significant damage to natural and human resources. Many countries are looking for ways to fight forest fires at an early stage using sensor networks, by integrating IT technologies. This paper proposes an energy-efficient fire monitoring protocol over cluster-based sensor networks. The proposed protocol...

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  • White Papers // Jan 2012

    Efficient Complex Event Processing Over RFID Streams

    RFID events are a large volume of stream data that continuously come out for tracking and monitoring objects. Many studies have been done to detect a complex event in the RFID stream. However, the existing studies have many problems which increase unnecessary operations when complex events do not satisfy minimum...

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  • White Papers // Dec 2011

    Performance Analysis of Flow-Based Traffic Splitting Strategy on Cluster-Mesh Sensor Networks

    Performance analysis is crucial for designing predictable and cost-efficient sensor networks. Based on the network calculus theory, the authors propose a flow-based traffic splitting strategy and its analytical method for worst-case performance analysis on cluster-mesh sensor networks. The traffic splitting strategy can be used to alleviate the problem of uneven...

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  • White Papers // Jan 2012

    InContexto: Multisensor Architecture to Obtain People Context from Smartphones

    The way users interact with Smartphones is changing after the improvements made in their embedded sensors. Increasingly, these devices are being employed as tools to observe individuals habits. Smartphones provide a great set of embedded sensors, such as accelerometer, digital compass, gyroscope, GPS, microphone, and camera. This paper aims to...

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  • White Papers // Dec 2011

    Logic Macroprogramming for Wireless Sensor Networks

    It is notoriously difficult and tedious to program Wireless Sensor Networks (WSNs). To simplify WSN programming, the authors propose Sense2P, a logic macro-programming system for abstracting, programming, and using WSNs as globally deductive databases. Unlike macro-programs in previous works, their logic macro-programs can be described declaratively and imperatively. In Sense2P,...

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  • White Papers // Dec 2011

    A Study on Cluster Partitioning with Cooperative MISO Scheme in Wireless Sensor Networks

    This paper addresses the cluster partitioning problem in wireless sensor networks deployed in a continuous area. The authors present the model of the network and describe its operational details firstly. Both single-hop and multihop transmissions with cooperative Multi-Input Single-Output (MISO) scheme are considered for the intercluster communications. Besides, uniform and...

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  • White Papers // Jan 2012

    Spatial and Temporal Correlations-Based Routing Algorithm in Intermittent Connectivity Human Social Network

    The social network formed by people is one of the key applications of Delay-Tolerant Network (DTN). Owing to its intermittent connectivity and unique human mobility patterns, how to transmit data in an effective way is a challenging problem for the social network. In this paper, the authors propose the idea...

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  • White Papers // Sep 2012

    A Camera Nodes Correlation Model Based on 3D Sensing in Wireless Multimedia Sensor Networks

    In wireless multimedia sensor networks, multiple camera sensor nodes generally are used for gaining enhanced observations of a certain area of interest. In this paper, first, based on the analysis of 3D directional sensing model of camera sensor nodes, a correlation model is proposed by measuring the intersection area of...

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  • White Papers // Jun 2012

    Investigation of Uncoordinated Coexisting IEEE 802.15.4 Networks with Sleep Mode for Machine-To-Machine Communications

    The low-energy consumption of IEEE 802.15.4 networks makes it a strong candidate for Machine-To-Machine (M2M) communications. As multipleM2M applications with 802.15.4 networks may be deployed closely and independently in residential or enterprise areas, supporting reliable and timely M2M communications can be a big challenge especially when potential hidden terminals appear....

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  • White Papers // Jun 2012

    A Congestion-Aware IDS Node Selection Method for Wireless Sensor Networks

    The authors propose an Intrusion Detection System (IDS) node selection method for Wireless Sensor Networks (WSNs). Due to the WSNs' distinctive tree structure, network congestion normally occurs in nodes that are located in the vicinity of a static base station. In this paper, they propose an Intrusion Detection Systems (IDSs)...

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  • White Papers // May 2012

    Aggregation Scheme with Secure Hierarchical Clustering for Wireless Sensor Networks

    In recent years, wireless sensor networks have been studied in many different applications, including environmental monitoring, battlefield surveillance, and other domains. In each of these applications, global state-based data are collected by all sensors and periodically transmitted to a sink. Given their compactness and extremely low cost, wireless sensor nodes...

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