Hindawi Publishing

Displaying 1-40 of 1690 results

  • White Papers // Mar 2013

    Efficient Heuristic Based on Clustering Approach for OLSR

    Due to the dynamic nature of Mobile Ad hoc NETwork (MANET), the Quality-of-Service (QoS) requires several improvements. The present paper comes within the framework of research to optimize QoS in MANET. In this paper, the authors propose a novel version of OLSR based on the clustering approach which is inspired...

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  • White Papers // Oct 2013

    Efficient Cluster Head Selection Algorithm for MANET

    In Mobile Ad hoc NETwork (MANET) cluster head selection is considered a gigantic challenge. In wireless sensor network LEACH protocol can be used to select cluster head on the bases of energy, but it is still a dispute in mobile ad hoc networks and especially when nodes are itinerant. In...

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  • White Papers // Feb 2014

    Hybrid Optical Switching for Data Center Networks

    Current data centers networks rely on electronic switching and point-to-point interconnects. When considering future data center requirements, these solutions will raise issues in terms of flexibility, scalability, performance, and energy consumption. For this reason several optical switched interconnects, which make use of optical switches and Wavelength Division Multiplexing (WDM), have...

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  • White Papers // Apr 2014

    A High Performance Load Balance Strategy for Real-Time Multicore Systems

    Finding ways to distribute workloads to each processor core and efficiently reduce power consumption is of vital importance, especially for real-time systems. In this paper, a novel scheduling algorithm is proposed for real-time multicore systems to balance the computation loads and save power. The developed algorithm simultaneously considers multiple criteria,...

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  • White Papers // Oct 2011

    Adaptivity Support for MPSoCs Based on Process Migration in Polyhedral Process Networks

    System adaptivity is becoming an important feature of modern embedded multiprocessor systems. To achieve the goal of system adaptivity when executing Polyhedral Process Networks (PPNs) on a generic tiled Network-on-Chip (NoC) MPSoC platform, the authors propose an approach to enable the run-time migration of processes among the available platform resources....

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  • White Papers // Mar 2009

    APRON: A Cellular Processor Array Simulation and Hardware Design Tool

    The authors present a software environment for the efficient simulation of Cellular Processor Arrays (CPAs). This software APRON (Array Processing enviRONment) is used to explore algorithms that are designed for massively parallel fine-grained processor arrays, topographic multilayer neural networks, vision chips with SIMD processor arrays, and related architectures. The software...

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  • White Papers // Dec 2011

    Evaluation of Runtime Task Mapping Using the rSesame Framework

    Performing runtime evaluation together with design time exploration enables a system to be more efficient in terms of various design constraints, such as performance, chip area, and power consumption. rSesame is a generic modeling and simulation framework, which can explore and evaluate reconfigurable systems at both design time and runtime....

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  • White Papers // Nov 2011

    A Signature-Based Power Model for MPSoC on FPGA

    In this paper, the authors present a framework for high-level power estimation of Multi-Processor System-on-Chip (MPSoC) architectures on FPGA. The technique is based on abstract execution profiles, called event signatures, and it operates at a higher level of abstraction than, for example, commonly used Instruction-Set Simulator (ISS)-based power estimation methods...

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  • White Papers // Dec 2008

    Parallel Backprojection: A Case Study in High-Performance Reconfigurable Computing

    High-Performance Reconfigurable Computing (HPRC) is a novel approach to provide large-scale computing power to modern scientific applications. Using both General-Purpose Processors (GPPs) and FPGAs allows application designers to exploit fine-grained and coarse-grained parallelism, achieving high degrees of speedup. One scientific application that benefits from this technique is backprojection, an image...

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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 // 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 // Oct 2011

    Towards an Automatic Parameter-Tuning Framework for Cost Optimization on Video Encoding Cloud

    The emergence of cloud encoding services facilitates many content owners, such as the online video vendors, to transcode their digital videos without infrastructure setup. Such service provider charges the customers only based on their resource consumption. For both the service provider and customers, lowering the resource consumption while maintaining the...

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  • White Papers // Jun 2012

    Security Analysis and Enhancements of an Effective Biometric-Based Remote User Authentication Scheme Using Smart Cards

    Recently, many biometrics-based user authentication schemes using smart cards have been proposed to improve the security weaknesses in user authentication system. In 2011, Das proposed an efficient biometric-based remote user authentication scheme using smart cards that can provide strong authentication and mutual authentication. In this paper, the authors analyze the...

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  • White Papers // Jan 2013

    Applying LU Decomposition of Matrices to Design Anonymity Bilateral Remote User Authentication Scheme

    The authors apply LU decomposition of matrices to present an anonymous bilateral authentication scheme. This paper aims at improving security and providing more excellent performances for remote user authentication scheme. The proposed scheme can provide bilateral authentication, session key agreement, can quickly check the validity of the input password, and...

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  • White Papers // Jun 2010

    A Reinforcement Learning Based Framework for Prediction of Near Likely Nodes in Data-CentricMobileWireless Networks

    Data-centric storage provides energy-efficient data dissemination and organization for the increasing amount of wireless data. One of the approaches in data-centric storage is that the nodes that collected data will transfer their data to other neighboring nodes that store the similar type of data. However, when the nodes are mobile,...

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  • White Papers // Oct 2010

    Multimode Transmission in Network MIMO Downlink With Incomplete CSI

    The authors consider a cooperative multi-cell MIMO (a.k.a network MIMO) downlink system with multi-antenna Base Stations (BSs), which are connected to a central unit and communicate with multi-antenna users. In such a network, obtaining perfect Channel State Information (CSI) of all users at the central unit to exploit opportunistic scheduling...

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  • White Papers // Jul 2012

    Intelligent Agent-Based Intrusion Detection System Using Enhanced Multiclass SVM

    Intrusion detection systems were used in the past along with various techniques to detect intrusions in networks effectively. However, most of these systems are able to detect the intruders only with high false alarmrate. In this paper, the authors propose a new intelligent agent-based intrusion detection model for mobile ad...

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  • White Papers // Sep 2012

    A Stochastic Hyperheuristic for Unsupervised Matching of Partial Information

    In this paper, (Revised version of a white paper "Unsupervised Problem-Solving by Optimising through Comparisons," originally published on DCS and Scribd, October 2011.) the authors describe the implementation and functionality of a centralised problem solving system that is included as part of the distributed "Licas" system. This is an open...

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  • White Papers // Sep 2012

    Impact of Antenna Placement on Frequency Domain Adaptive Antenna Array in Hybrid FRF Cellular System

    Frequency Domain Adaptive Antenna Array (FDAAA) is an effective method to suppress interference caused by frequency selective fading and Multiple-Access Interference (MAI) in Single-Carrier (SC) transmission. However, the performance of FDAAA receiver will be affected by the antenna placement parameters such as antenna separation and spread of Angle Of Arrival...

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  • White Papers // Jan 2013

    Client-Driven Joint Cache Management and Rate Adaptation for Dynamic Adaptive Streaming Over HTTP

    Due to the fact that proxy-driven proxy cache management and the client-driven streaming solution of Dynamic Adaptive Streaming over HTTP (DASH) are two independent processes, some difficulties and challenges arise in media data management at the proxy cache and rate adaptation at the DASH client. This paper presents a novel...

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  • White Papers // Nov 2012

    PAPR Reduction of OFDM Signals by Novel Global Harmony Search in PTS Scheme

    The Orthogonal Frequency Division Multiplexing (OFDM) modulation technique is one of the key strategies for multiuser signal transmission especially in smart grids and wind farms. This paper introduces an approach for Peak-to-Average Power Ratio (PAPR) reduction of such signals based on Novel Global Harmony Search (NGHS) and Partial Transmit Sequence...

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  • White Papers // Dec 2011

    LDPC FEC Code Extension for Unequal Error Protection in DVB-T2 System: Design and Evaluation

    The Digital Video Broadcasting organisation has recently introduced the second generation of terrestrial broadcast transmission standards, DVB-T2. The newly introduced tools ensure significant gain in performance of DVB-T2 compared to the first generation variant of the standard. One of these tools is the new physical layer concatenated forward error correction...

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  • White Papers // Nov 2011

    Efficient Wireless Broadcasting Through Joint Network Coding and Beamforming

    The authors develop a framework that exploits Network Coding (NC) and Multiple-Input/Multiple-Output (MIMO) techniques, jointly together, to improve throughput of downlink broadcast channels. Specifically, they consider a Base Station (BS) equipped with multiple transmit antennas that serves multiple Mobile Stations (MSs) simultaneously by generating multiple signal beams. Given the large...

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  • White Papers // Mar 2012

    Adjustable Two-Tier Cache for IPTV Based on Segmented Streaming

    Internet Protocol TV (IPTV) is a promising Internet killer application, which integrates video, voice, and data onto a single IP network, and offers viewers an innovative set of choices and control over their TV content. To provide high-quality IPTV services, an effective strategy is based on caching. This work proposes...

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  • White Papers // Apr 2012

    Video Classification and Adaptive QoP/QoS Control for Multiresolution Video Applications on IPTV

    With the development of heterogeneous networks and video coding standards, multi-resolution video applications over networks become important. It is critical to ensure the service quality of the network for time-sensitive video services. In this paper, the authors present a quality control mechanism in multi-resolution video coding structures over WIMAX networks...

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  • White Papers // Mar 2012

    A Secure and Stable Multicast Overlay Network with Load Balancing for Scalable IPTV Services

    In this paper, the authors use SIP protocol to construct a secure application-layer multicast overlay network for IPTV, called SIPTVMON. SIPTVMON can secure all the IPTV media delivery paths against eavesdroppers via Elliptic-Curve Diffie-Hellman (ECDH) key exchange on SIP signaling and AES encryption. Its load-balancing overlay tree is also optimized...

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  • White Papers // Apr 2012

    Rate Adaptive Selective Segment Assignment for Reliable Wireless Video Transmission

    A reliable video communication system is proposed based on data partitioning feature of H.264/AVC, used to create a layered stream, and LT codes for erasure protection. The proposed scheme termed Rate Adaptive Selective Segment Assignment (RASSA) is an adaptive low-complexity solution to varying channel conditions. The comparison of the results...

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  • White Papers // Mar 2012

    QoS Supported IPTV Service Architecture Over Hybrid-Tree-Based Explicit Routed Multicast Network

    With the rapid advance in multimedia streaming and multicast transport technology, current IP multicast protocols, especially PIM-SM, become the major channel delivery mechanism for IPTV system over Internet. The goals for IPTV service are to provide two-way interactive services for viewers to select popular program channel with high quality for...

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  • White Papers // May 2012

    Secure and Reliable IPTV Multimedia Transmission Using Forward Error Correction

    With the wide deployment of Internet Protocol (IP) infrastructure and rapid development of digital technologies, Internet Protocol TeleVision (IPTV) has emerged as one of the major multimedia access techniques. A general IPTV transmission system employs both encryption and Forward Error Correction (FEC) to provide the authorized subscriber with a high-quality...

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  • White Papers // May 2012

    Background Traffic-Based Retransmission Algorithm for Multimedia Streaming Transfer Over Concurrent Multipaths

    The content-rich multimedia streaming will be the most attractive services in the next-generation networks. With function of distribute data across multipath end-to-end paths based on SCTP's multihoming feature, Concurrent Multipath Transfer SCTP (CMT-SCTP) has been regarded as the most promising technology for the efficient multimedia streaming transmission. In this paper,...

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  • White Papers // Oct 2011

    A Gain-Computation Enhancements Resource Allocation for Heterogeneous Service Flows in IEEE 802.16m Mobile Networks

    In this paper, the authors deal with radio resource allocation in Fourth Generation (4G) wireless mobile networks based on Orthogonal Frequency Division Multiple Access (OFDMA) as an access method. In IEEE 802.16m standard a contiguous method for sub-channel construction is adopted in order to reduce OFDMA system complexity. In this...

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  • White Papers // Oct 2011

    Performance Evaluation of an Object Management Policy Approach for P2P Networks

    In this paper, the authors propose and analyze an object management policy approach for video web cache in a P2P context, taking advantage of object's metadata, for example, video popularity, and object's encoding techniques, for example, Scalable Video Coding (SVC). They carry out trace-driven simulations so as to evaluate the...

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  • White Papers // Oct 2012

    Compact, Frequency Reconfigurable, Printed Monopole Antenna

    In this paper, the authors propose a possible implementation of a compact printed monopole antenna, useful to operate in UMTS and WLAN bands. In order to accomplish that, a miniaturization technique based on the application of chip inductors is used in conjunction with frequency reconfiguration capability. The chip inductors change...

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  • White Papers // Oct 2012

    An Efficient Analysis Method for Cylindrical Conformal Microstrip Antenna Fed by Microstripline

    Firstly, a domain-division solution is provided in this paper, which can solve Hankel function's singular problem of Sommerfeld integral in calculating the spatial domain Green function for cylindrically stratified media and realize the computation for all elements of Z-matrix in the method of moment. Then, the arbitrary shape Cylindrical Conformal...

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  • White Papers // Oct 2012

    High Gain Array of Monopoles-Coupled Antennas for Wireless Applications

    An array of monopole antennas over a ground plane that radiates a directive lobe in the end-fire direction are described in this paper. The design uses the rigorous method described by Drouet et al. 2008 in order to synthesize the radiation through the strong cumulative coupling between the monopoles. A...

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  • White Papers // Oct 2012

    Performance Evaluation of Closed-Loop Spatial Multiplexing Codebook Based on Indoor MIMO Channel Measurement

    Closed-loop MIMO technique standardized in LTE can support different layer transmissions through pre-coding operation to match the channel multiplexing capability. However, the performance of the limited size codebook still needs to be evaluated in real channel environment for further insights. Based on the wideband MIMO channel measurement in a typical...

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  • White Papers // Oct 2012

    A Review of Antennas for Indoor Positioning Systems

    In this paper, the authors provide a review of antennas applied for indoor positioning or localization systems. The desired requirements of those antennas when integrated in anchor nodes (reference nodes) are discussed, according to different localization techniques and their performance. The described antennas will be subdivided into the following sections...

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  • White Papers // Sep 2012

    SAR Experiments Using a Conformal Antenna Array Radar Demonstrator

    Conformal antenna arrays have been studied for several years but only few examples of applications in modern radar or communication systems may be found up to date due to technological difficulties. The objective of the "Electronic Radar with Conformal Array Antenna" (ERAKO) demonstrator system which has been developed at the...

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  • White Papers // Sep 2012

    Elevated CPW-Fed Slotted Microstrip Antenna for Ultra-Wideband Application

    Recently, a considerable amount of researches have been devoted to the development of UWB antenna for its enabling high data transmission rates, low power consumption, and simple hardware configuration in wireless applications like radio frequency identification devices, sensor networks, radar, location tracking system, and so forth. The UWB antennas of...

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  • White Papers // Oct 2012

    Differences in User Influence on MIMO Handset Antenna Performance in Reverberation Chamber

    User influence on Multiple-Input Multiple-Output (MIMO) performance is studied for different dual antenna handsets specially designed to have good and bad MIMO performance. The study reveals that user influence can cause either improvement or degradation for different test objects, including a spread effect over the parameters. Differences in performance between...

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