Scientific Research

Displaying 1-40 of 609 results

  • White Papers // Jun 2009

    Mobility Trigger Management: Implementation and Evaluation

    Modern mobile devices have several network interfaces and can run various network applications. In order to remain always best connected; events need to be communicated through the entire protocol stack in an efficient manner. Current implementations can handle only a handful of low level events that may trigger actions for...

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  • White Papers // May 2009

    Energy Aware Clustered Based Multipath Routing in Mobile Ad Hoc Networks

    With the advance of wireless communication technologies, small-size and high-performance computing and communication devices are increasingly used in daily life. After the success of second generation mobile system, more interest was started in wireless communications. A Mobile Ad hoc NETwork (MANET) is a wireless network without any fixed infrastructure or...

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  • White Papers // Jul 2011

    Location Based Performance of WiMAX Network for QoS With Optimal Base Stations (BS)

    In this paper, the authors are given concept of their WiMAX (Worldwide Interoperability for Microwave Access) network performance for QoS monitoring and optimization solution for BS (Base Station) with multimedia application. In the communication sector, the optimal objective is to equate quality and cost. Due to its large coverage area,...

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  • White Papers // Jan 2012

    A Novel Statistical AOA Model Pertinent to Indoor Geolocation

    A novel statistical Angle-Of-Arrival (AOA) model for indoor geolocation applications is presented. The modeling approach focuses on the arrivals of the multipath components with respect to the Line-Of-Sight (LOS) path which is an important component especially when indoor geolocation applications are considered. The model is particularly important for indoor applications...

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  • White Papers // Sep 2012

    Capacity Calculation and Sub-Optimal Power Allocation Scheme for OFDM-Based Systems

    For emerging cellular wireless systems, the mitigation of inter-cell interference is the key to achieve a high capacity and good user experience. This paper is devoted to the performance analysis of interference mitigation techniques for the downlink in an Orthogonal Frequency Division Multiple Access (OFDMA) network, with a focus on...

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  • White Papers // Nov 2012

    Performance Evaluation of Traffic Engineering Signal Protocols in IPV6 MPLS Networks

    This paper studies the performance of Traffic Engineering (TE) signal protocols used for load balancing in Multi-Protocol Label Switching (MPLS) networks, namely; Constraint Based Routed Label Distribution Protocol LDP (CR-LDP) and Resource Reservation Protocol (RSVP). Furthermore, the performance of an MPLS network uses these TE signal protocols is compared to...

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  • White Papers // Oct 2012

    A Novel Offline PLI-RWA and Hybrid Node Architecture for Zero Blocking and Time Delay Reduction in Translucent Optical WDM Networks

    In this paper, The authors contrive a model that underpins the offline Physical Layer Impairment-Routing and Wavelength Assignment (PLI-RWA) issue in translucent networks. The authors introduce an innovative PLI-Signal Quality Aware RWA (PLI-SQARWA) algorithm that guarantees zero blocking due to signal degradation and wavelength contention and aims at minimizing the...

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  • White Papers // Oct 2012

    Design of Network Architecture Using Mobile Gateways for DLNA Devices in Wide Area Networks

    The prevalence of information appliances supporting DLNA (Digital Living Network Alliance) such as televisions, recorders, and mobile phones has made it possible to share digital contents (e.g. videos, music and pictures) among appliances connected to a local network. However, DLNA does not let the people share contents over different networks...

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  • White Papers // Oct 2012

    Network Connectivity Probability of Linear Vehicular Ad Hoc Networks on Two-Way Street

    In this paper, the authors present an analytical model to determine the network connectivity probability of a linear vehicular Ad-hoc NETwork (VANET) formed by communication equipped vehicles on a two-way street scenario. They consider the highway to be consisting of two lanes with vehicles moving in both directions on these...

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  • White Papers // Nov 2012

    Cognitive Radio Ad-Hoc Networks: Some New Results on Multi-Channel Hidden Terminal Problem

    Recently the Cognitive Radio (CR), in particular the CR Ad-Hoc Network (CRAHN) technology appears as a burgeoning area in wireless communication that enables utilization of limited network resources in more efficient and intelligent way; studies indicate that opportunistic utilization of the available radio frequency spectrum, without interfering the licensed Primary...

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  • White Papers // Feb 2012

    Optimal Number of Relays in Cooperative Communication in Wireless Sensor Networks

    Wireless Sensor Networks (WSN) typically consist of resource constrained micro sensors that organize itself into multi-hop wireless network. Sensors collect data and send it directly, or through intermediate hops in cooperative communication system, to the collection point. These sensors are powered up by batteries, for which the replacement or recharging...

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  • White Papers // Apr 2012

    Inter-Network Resource Sharing in IEEE 802.22 Networks

    IEEE 802.22 is the first worldwide standard for Cognitive Networks (CNs) that exploits unused spectrum of the television broadcast service. An IEEE 802.22 network is also called Wireless Regional Area Network (WRAN). An open issue in cognitive 802.22 networks is represented by the resource distribution among WRANs. In this paper...

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  • White Papers // Apr 2012

    MAC-PHY Cross-Layer for High Channel Capacity of Multiple-Hop MIMO Relay System

    For the high end-to-end channel capacity, the amplify-and-forward scheme multiple-hop MIMO relays system is considered. The distance between each transceiver is optimized to prevent some relays from being the bottleneck and guarantee the high end-to-end channel capacity. However, in some cases, the location of relays can't be set at the...

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  • White Papers // Apr 2012

    An Average Power Reduction Method for Web Applications on Wireless Terminals

    Recently, there is a widespread use of Web browser-based Web applications such as e-mails and chats. However, frequent communication between mobile wireless terminals and HTTP servers give rise to problematic increases of average power consumption for the mobile devices. Current attempts to tackle this problem focus on reducing power consumption...

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  • White Papers // Apr 2012

    The Tight Bound for the Number of Pilots in Channel Estimation for OFDM Systems

    Coherent detection in OFDM systems requires accurate Channel State Information (CSI) at the receiver. Channel estimation based on pilot-symbol-assisted transmissions provides a reliable way to obtain CSI. Use of pilot symbols for channel estimation, introduces overhead and it is desirable to keep the number of pilot symbols as minimum as...

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  • White Papers // May 2012

    Load Balancing in IP/MPLS Networks: A Survey

    The present era has witnessed tremendous growth of the Internet and various applications that are supported by it. There is an enormous pressure on Internet Service Providers (ISPs) to make available adequate services for the traffics like VoIP and Video on demand. Since the resources like computing power, bandwidth etc....

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  • White Papers // Apr 2012

    Homogeneous and Heterogeneous Traffic of Data Packets on Complex Networks: The Traffic Congestion Phenomenon

    The authors study the congestion phenomenon in a mathematical model of the data packets traffic in transmission networks as a function of the topology and of the load of the network. Two types of traffic are considered: homogeneous and heterogeneous traffic. The congestion phenomenon is studied in stationary conditions through...

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  • White Papers // Mar 2012

    Study of Modeling for Scalable and Monitorable Network on Chip

    The performance of multiple processor based on Network on Chip (NoC) is limited to the communication efficiency of network. It is difficult to be optimized of routing and arbitration algorithm and be assessed of performance in the beginning of design because of its complex test cases. This paper constructs a...

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  • White Papers // Jun 2012

    Optimization of Security Communication Wired Network by Means of Genetic Algorithms

    The realization of security wired network is very critical when the network itself must be installed in an environment full of restrictions and constrains such as historical palaces, characterized by unique architectural features. The purpose of this paper is to illustrate an advanced installation design technique of security wired network...

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  • White Papers // Jul 2012

    OFDMA Uplink Frequency Offset Estimation with Multi-Access Interference Mitigation

    In this paper, the authors consider the frequency offset estimation for Orthogonal Frequency-Division Multiple Access (OF- DMA) Up Link (UL) transmissions. They first analyze the negative effect of Multi-Access-Interference (MAI) on OFDMA UL, and then propose two interference reduction/elimination methods, i.e., the Reduced-Rank-Projector (RRP) and Shift-Sampling-Projector (SSP) methods, to eliminate/reduce...

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  • White Papers // May 2012

    User Informatics Optimized Search and Retrieval-Congestion Avoidance Scheme for 4G Networks

    The objective of 4G network is to provide best services to the users which in turn made the performance of existing network more critical. Further, the large traffic generated in such networks creates congestion resulting in overloading of the system. Frequent delays, loss of packets, and in addition the number...

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  • White Papers // Apr 2012

    Pilot Based Channel Estimation in Broadband Power Line Communication Networks

    In this paper pilot based channel estimation is being considered for Broadband Power Line Communication (BPLC) networks witch used Orthogonal Frequency Division Multiplexing (OFDM) in order to transmit high rate data. To estimate channel in time or frequency some pilot must be used. Number of these pilots and deployment of...

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  • White Papers // Dec 2012

    Performance Analysis of Hybrid MAC Protocol for Cognitive Radio Networks

    The rapid growth in demand for broadband wireless services coupled with the recent developmental work on wireless communications technology and the static allocation of the spectrum have led to the artificial scarcity of the radio spectrum. The traditional command and control model (Static allocation) of spectrum allocation policy allows for...

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  • White Papers // Dec 2012

    Scalable Incremental Network Programming for Multihop Wireless Sensors

    The authors present a network programming mechanism that can flexibly and quickly re-task a large multi-hop network of wireless sensor nodes. Their mechanism allows each sensor node to be incrementally reprogrammed with heterogeneous images of native program code using Rsync block comparison algorithm, point-to-point routing with the BLIP IPv6 stack,...

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  • White Papers // Dec 2012

    Simple GUI Wireless Controller of Quadcopter

    This paper presents the development of remotely operated Quadcopter system. The Quadcopter is controlled through a Graphical User Interface (GUI) where the communication between GUI and Quadcopter is constructed by using wireless communication system. The Quadcopter balancing condition is sensed by FY90 controller and IMU 5DOF sensor. For smooth landing,...

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  • White Papers // Dec 2012

    A New Method for Sensing Cognitive Radio Network under Malicious Attacker

    Cognitive radio has been designed for solving the problem of spectrum scarcity by using the spectrum of primary users who don't use their spectrum on that time. For sensing the spectrum, collaborative spectrum sensing has been utilized because of robustness. In this paper, a new collaborative spectrum method is proposed...

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  • White Papers // Jul 2012

    The Influence of Memetic Primers in Online Comments in Video Game Blogs

    Through investigating a particular blog, several factors were found which have significant influence on reader actions. This paper uses the term "Memetic primers" for those styles that most often cause readers to take notice of a particular comment, remember information included in it and take action. The memetic primers were...

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  • White Papers // Jul 2012

    P2P Model Based on Isolated Broadcast Domains

    Resource location is the most important issue for Peer-To-Peer (P2P) system and flooding is the fundamental mechanism for unstructured P2P systems. Redundant messages will exponential growth with flooding scope increasing which severely influences the scalability of the system. In this paper, a new P2P model based on isolated broadcast domains...

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  • White Papers // Oct 2012

    Inkjet-Printed UHF RFID Tags on Renewable Materials

    Radio Frequency IDentification (RFID) provides great potential for different Internet of Things (IOT) applications. In the future, material choices in these IOT devices will have a huge effect on the environment and thus use of renewable materials is a growing trend. In this paper, passive Ultra High Frequency (UHF) RFID...

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  • White Papers // Oct 2012

    Application of Full Text Search Engine Based on Lucene

    With the rapid development of Internet and with the explosive growth of web information, Internet users how to remove the impurities and retained the essence quickly and easily to gain the information they need in the vast ocean of information to become a hot research topic in this field. This...

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  • White Papers // Oct 2012

    UMIS: A Service for User Model Interoperability

    In this paper, the authors describe UMIS, a service architecture that enables user adaptive applications to exchange User Model data on the Web. UMIS provides a set of facilities that allow applications to interoperate with minimum changes in their internal logics and knowledge representation. The goal is to support the...

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  • White Papers // Aug 2009

    The Study and Application of the IoT in Pet Systems

    The interaction between human and physical devices and devices in the real world is gaining more attention and requires a natural and intuitive methodology to employ. According to this idea and living well, life has been a growing demand. Thus, how to raise pets in an easy way has been...

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  • White Papers // Aug 2009

    The Comparisonal Analysis of the Concept of Rectangular and Hexagonal Pilot in OFDM

    Channel estimation in coherent OFDM by inserting pilot-symbols into two-dimensional time-frequency lattice is a promising candidate for improving channel transmission capacity in future wireless communication systems. This paper proposes a new Cartesian mathematical concept of the Hexagonal Pilot Pattern, Hexagonal Pilot with Virtual and Rectangular Pilot Pattern. The main focus...

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  • White Papers // Aug 2009

    Principle of Link Evaluation

    Link Evaluation (LE) is proposed in system evaluation to reduce complexity. It is important to practical systems also for link adaptation. Current algorithms for link evaluation are developed by simulation method, lacking of theoretical description. Although they provide some good accuracy for some scenarios, all of them are not universal....

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  • White Papers // Aug 2009

    Comparison and Design of Decoder in B3G Mobile Communication System

    Turbo code has been shown to have ability to achieve performance that is close to Shannon limit. It has been adopted by various commercial communication systems. Both Universal Mobile Telecommunications System (UMTS) TDD and FDD have also employed turbo code as the error correction coding scheme. It out-performs convolutional code...

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  • White Papers // Aug 2009

    Approximate Analysis of Power Offset Over Spatially Correlated MIMO Channels

    Power offset is zero-order term in the capacity versus signal-to-noise ratio curve. In this paper, approximate analysis of power offset is presented to describe MIMO system with uniform linear antenna arrays of fixed length. It is assumed that the number of receive antenna is larger than that of transmit antenna....

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  • White Papers // Aug 2009

    A Cross-Layer Scheme for Handover in 802.16e Network with F-HMIPv6 Mobility

    IEEE802.16e is the major global cellular wireless standard that enables low-cost mobile Internet application. However, existing handover process system still has latency affects time-sensitive applications. In this paper, the handover procedures of 802.16e and Fast Handover for Hierarchical MIPv6 (F-HMIPv6) are reconstructed to achieve a better transmission performance. The concept...

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  • White Papers // Aug 2009

    A Study of Multi-Node and Dual-Hop Collaborative Communication Performance Based on Harmonic Mean Method

    MIMO technique has been regarded as the essential technique for beyond 3G mobile cellular networks. The Benefits of MIMO system have been extensively studied by researchers in both academic and industry. It successfully meets the rapidly growing demand for high rate, voice and especially for multimedia services. Closed form expressions...

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  • White Papers // Aug 2009

    A Novel Scheme with Adaptive Sampling for Better Spectrum Utilization in Cognitive Radios

    In Cognitive Radio (CR) networks, cognitive users need continuously monitor spectrum to decrease or avoid interference to primary users, yet attain a reasonable throughput. In this paper, the authors exploit a scheme to dynamically change the detection time duration to gain maximum throughput. Meanwhile the average detection time is kept...

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  • White Papers // Aug 2009

    The Identification of Frequency Hopping Signal Using Compressive Sensing

    Compressive Sensing (CS) creates a new framework of signal reconstruction or approximation from a smaller set of incoherent projection compared with the traditional Nyquist-rate sampling theory. Recently, it has been shown that CS can solve some signal processing problems given incoherent measurements without ever reconstructing the signals. Moreover, the number...

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