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Scientific Research Publishing
(182 results)-
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A Comparative Study of Medium Access Control Protocols for Wireless Sensor Networks
November 1, 2009, 12:00am PDT
One of the major constraints in Wireless Sensor Networks (WSNs) is power consumption. In recent years, a lot of efforts have been put into the design of Medium Access Control (MAC) protocols for...
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A Survey on Context-Aware Sensing for Body Sensor Networks
August 1, 2010, 12:00am PDT
Context awareness in Body Sensor Networks (BSNs) has the significance of associating physiological user activity and the environment to the sensed signals of the user. The context information...
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An Exploratory Study of Experimental Tools for Wireless Sensor Networks
July 1, 2011, 12:00am PDT
The objective of this contribution is to present expositive review content on currently available experimental tools/services/concepts used for most emerging field Wireless Sensor Network that has...
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Adaptive Throughput Optimization in Downlink Wireless OFDM System
February 1, 2008, 12:00am PST
This paper presents a scheduling scheme for packet transmission in OFDM wireless system with adaptive techniques. The concept of efficient transmission capacity is introduced to make scheduling...
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Exploiting Geometric Advantages of Cooperative Communications for Energy Efficient Wireless Sensor Networks
February 1, 2008, 12:00am PST
Energy efficiency and enhanced backbone capacity is obtained by exploiting the geometric orientation of cooperative nodes in wireless sensor network. The cooperative communication in Wireless...
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Analysis of Lifetime of Large Wireless Sensor Networks Based on Multiple Battery Levels
May 1, 2008, 12:00am PDT
Due to the limited transmission range, data sensed by each sensor has to be forwarded in a multi-hop fashion before being delivered to the sink. The sensors closer to the sink have to forward...
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Beacon-Driven Leader Based Protocol Over a GE Channel for MAC Layer Multicast Error Control
May 1, 2008, 12:00am PDT
In wireless networks current standard MAC layer protocols don't provide any error correction scheme for broadcast/multicast. In this paper, the authors enhance a Leader Based Protocol (LBP) and...
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Streaming Multimedia Over Wireless Mesh Networks
May 1, 2008, 12:00am PDT
Wireless Mesh Network (WMN) research is an emerging field in network communications. However, WMNs pose several difficulties in the transmission of information, especially time critical...
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A Novel Adaptive Hybrid Error Correction Scheme for Wireless DVB Services
May 1, 2008, 12:00am PDT
Real-time applications usually not only have a certain Packet Loss Ratio (PLR) requirement but also can have strict delay constraints. In the past, the authors proposed a Hybrid Error Correction...
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Development of an intelligent VoWLAN Services for Patient Care Improvement
August 1, 2008, 12:00am PDT
Since the rapid exchange of information and collaboration with colleagues are indispensable for the quality of care. Effective communication between care givers has been recognized as a critical...
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On Energy-Efficient Node Deployment in Wireless Sensor Networks
August 26, 2008, 12:00am PDT
In wireless sensor networks, sensor nodes collect local data and transfer to the base station often relayed by other nodes. If deploying sensor nodes evenly, sensor nodes nearer to the base...
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Relations Among Mobility Metrics in Wireless Networks
August 1, 2008, 12:00am PDT
In wireless network simulation analysis, researchers tweak mobility metrics, such as the speed or the pause time of the nodes, to get different stability levels of the network. Meanwhile, in...
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Improving Throughput in Wireless Local Area Networks
November 1, 2008, 12:00am PDT
The Medium Access Control (MAC) technique of standard WLANs, called the Distributed Coordination Function (DCF), is Carrier Sense Multiple Access based on Collision Avoidance (CSMA/CA) scheme with...
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Performance Study of a Cross-Layer Based Multipath Routing Protocol for IEEE 802.11e Mobile Ad Hoc Networks
November 1, 2008, 12:00am PDT
Communication over wireless links identifies significant challenges for routing protocols operating. This paper proposes a Cross-layer design based Multipath Routing Protocol (CMRP) for mobile ad...
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A Priority Queuing Model for HCF Controlled Channel Access (HCCA) in Wireless LANs
February 1, 2009, 12:00am PST
Recently, there has been a rapid growing interest in new applications requiring Quality of Service (QoS) guarantees through Wireless Local Area Networks (WLAN). These demands have led to the...
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Gateways Placement in Backbone Wireless Mesh Networks
February 1, 2009, 12:00am PST
This paper presents a novel algorithm for the gateway placement problem in Backbone Wireless Mesh Networks (BWMNs). Different from existing algorithms, the new algorithm incrementally identifies...
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Parallel-Transmission: A New Usage of Multi-Radio Diversity in Wireless Mesh Network
February 1, 2009, 12:00am PST
To fully utilize the diversity of multi-radio, a new parallel transmission method for wireless mesh network is proposed. Compared with conventional packet transmission which follows "One flow on...
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Generality Challenges and Approaches in WSNs
February 1, 2009, 12:00am PST
Ignoring the generality in the design of Wireless Sensor Networks (WSNs) applications limits their benefits. Furthermore, the possibilities of future extension and adaptation are also restricted....
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Five Basic Types of Insider DoS Attacks of Code Dissemination in Wireless Sensor Networks
February 1, 2009, 12:00am PST
Code dissemination is one of the important services of Wireless Sensor Networks (WSNs). Securing the process of code dissemination is essential in some certain WSNs applications, state-of-the-art...
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Subarea Tree Routing (STR) in Multi-Hop Wireless Ad Hoc Networks
April 1, 2009, 12:00am PDT
Subarea Tree Routing (STR), a new routing protocol for multi-hop wireless ad hoc networks, is proposed. The novelty of the STR protocol is to divide the whole network into many subareas...
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Research on ZigBee Wireless Sensors Network Based on ModBus Protocol
April 1, 2009, 12:00am PDT
Wireless ZigBee is a very low-cost, very low power consumption, two-way, wireless communications technology, which can be used widely in consumer electronics, home and building automation,...
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An Energy-Aware Clustering Approach for Wireless Sensor Networks
May 1, 2009, 12:00am PDT
Energy conservation is an essential and critical requirement for a wireless sensor network with battery operated nodes intended for long term operations. Prior work has described different...
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Fractional Sampling Improves Performance of UMTS Code Acquisition
June 1, 2009, 12:00am PDT
An improved technique with a fractional sampling based on two samples per chip, according to the Nyquist criterion, has been employed by the authors to enhance the performance in the code...
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On Approaches to Congestion Control Over Wireless Networks
June 1, 2009, 12:00am PDT
Congestion control in wireless networks has been extensively investigated over the years and several schemes and techniques have been developed, all with the aim of improving performance in...
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An Improved Analytical Model for IEEE 802.11 Distributed Coordination Function Under Finite Load
June 1, 2009, 12:00am PDT
In this paper, an improved analytical model for IEEE 802.11 Distributed Coordination Function (DCF) under finite load is proposed by closely following the specifications given in IEEE 802.11...
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The Application of Optical CDMA-Based Fiber Radio Networks in Wireless Sensor Networks
July 1, 2009, 12:00am PDT
One fiber radio scheme using shifted prime codes for interference elimination is proposed for Optical Code-Division Multiple-Access (OCDMA) network. By taking advantage of the cyclic property of...
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Centralized Quasi-Static Channel Assignment for Multi-Radio Multi-Channel Wireless Mesh Networks
July 1, 2009, 12:00am PDT
Employing multiple channels in wireless multi-hop networks is regarded as an effective approach to increasing network capacity. This paper presents a centralized quasi-static channel assignment...
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UWB-Based Localization in Wireless Sensor Networks
August 1, 2009, 12:00am PDT
Localization has many important applications in wireless sensor networks, such as object searching and tracking, remote navigation, location based routing etc. The distance measurements have been...
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Incremental Network Programming for Wireless Sensors
July 5, 2009, 12:00am PDT
The authors present an incremental network programming mechanism which reprograms wireless sensors quickly by transmitting the incremental changes using the Rsync algorithm; they generate the...
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The Utilization of Push Mail in China
May 10, 2009, 12:00am PDT
Push mail is popular to business users in the world. It has been two years since push mail was introduced into China. In order to find out the status of its development and utilization,...
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Performance of Block Space-Time Code in Wireless Channel Dynamics
July 15, 2009, 12:00am PDT
In this paper, the authors observe the behavior of block space-time code in wireless channel dynamics. The block space-time code is optimally constructed in slow fading. The block code in...
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Bandwidth Optimization in 802.15.4 Networks Through Evolutionary Slot Assignment
September 1, 2009, 12:00am PDT
Traditional Wireless Sensor Networks (WSNs) based on carrier sense methods for channel access suffer from reduced bandwidth utilization, increase energy consumptions and latency problems in...
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Positioning a Node of Wireless Sensor Networks in 3 Dimensional Space
September 1, 2009, 12:00am PDT
To know the location of nodes is very important and valuable for Wireless Sensor Networks (WSN), the authors present an improved positioning model (3D-PMWSN) to locate the nodes in WSN. In this...
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An Adaptive Data Aggregation Algorithm in Wireless Sensor Network With Bursty Source
October 1, 2009, 12:00am PDT
The Wireless Sensor network is distributed event based systems that differ from conventional communication network. Sensor network has severe energy constraints, redundant low data rate, and...
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Evaluation of Network Stack Optimization Techniques for Wireless Sensor Networks
November 1, 2009, 12:00am PDT
The authors present a network stack implementation for a wireless sensor platform based on a byte-level radio. The network stack provides error-correction code, multi-channel capability and...
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Modified Ceiling Bounce Model for Computing Path Loss and Delay Spread in Indoor Optical Wireless Systems
November 1, 2009, 12:00am PDT
This paper proposes modifications to the tradional Ceiling Bounce Model and uses it to characterize diffuse indoor optical wireless channel by analyzing the effect of transceiver position on...
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Real-Time Automatic ECG Diagnosis Method Dedicated to Pervasive Cardiac Care
November 1, 2009, 12:00am PDT
Recent developments of the wireless sensor network will revolutionize the way of remote monitoring in different domains such as smart home and smart care, particularly remote cardiac care. Thus,...
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AEESPAN: Automata Based Energy Efficient Spanning Tree for Data Aggregation in Wireless Sensor Networks
November 1, 2009, 12:00am PDT
In Wireless Sensor Networks (WSNs), sensor nodes are developed densely. They have limit processing capability and low power resources. Thus, energy is one of most important constraints in these...
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Distributed Video Coding Using LDPC Codes for Wireless Video
November 1, 2009, 12:00am PDT
Popular video coding standards like H.264 and MPEG working on the principle of motion-compensated predictive coding demand much of the computational resources at the encoder increasing its...
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Dynamic Hierarchical Communication Paradigm for Wireless Sensor Networks: A Centralized, Energy Efficient Approach
November 1, 2009, 12:00am PDT
A Wireless Sensor Network (WSN) consists of a large number of randomly deployed sensor nodes. These sensor nodes organize themselves into a cooperative network and perform the three basic...
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Improved Radio Network Dimensioning for Real-Time Polling Service on IEEE 802.16 Wireless Networks With QoS Consideration
March 1, 2012, 12:00am PST
Recently, applications of real-time Polling Service (rtPS) in IEEE 802.16 wireless networks have gained considerable popularity. These applications generate large amounts of real time traffic in...
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Performance Evaluation of Java Web Services: A Developer's Perspective
May 10, 2010, 12:00am PDT
As the population of the Internet grows rapidly the development of web technologies becomes extremely important. For the evolvement of Web 2.0, web services are essential. Web services are...
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Optimization of UMTS Network Planning Using Genetic Algorithms
August 1, 2010, 12:00am PDT
The continuously growing of cellular networks complexity, which followed the introduction of UMTS technology, has reduced the usefulness of traditional design tools, making them quite unworthy....
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A Security Transfer Model Based on Active Defense Strategy
August 1, 2010, 12:00am PDT
This paper proposes a security transfer model founded on the active defense strategy. In the unit of security domains of dynamic overlaying routers, this model defines the intelligent...
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An Introduction to RFID Technology
August 1, 2010, 12:00am PDT
RFID technology emerged some time back and was not used that much because of lack of standardization and high costs. Latest technologies have brought costs down and standards are being developed....
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Comparison of 4 Multi-User Passive Network Topologies for 3 Different Quantum Key Distribution
August 1, 2010, 12:00am PDT
The purpose of this paper is to compare the performance of four passive optical network topologies in implementing multi-user quantum key distribution, using 3 protocols proposed by quantum...
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A Novel Black Box Based Behavioral Model of Power Amplifier for WCDMA Applications
August 1, 2010, 12:00am PDT
In this paper, Black Box approach is presented for behavioral modeling of a non linear power amplifier with memory effects. Large signal parameters of a Motorola LDMOS power amplifier driven by a...
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Compromise in CDMA Network Planning
August 1, 2010, 12:00am PDT
CDMA network planning, for example in 3G UMTS networks, is an important task whether for upgrading existing networks or planning new networks. It is a time consuming, computationally hard, task...
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Using Hybrid Adaptive Techniques to Reduce Multipath Effects in S-PCN Mobile Terminals
November 1, 2010, 12:00am PDT
Multipath signal processing is a promising technique for increasing the capacity of downlink frequency of Satellite Personal Communication Networks (S-PCN). The paper presents an approach to...
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All-Optical Cryptographic Device for Secure Communication
November 1, 2010, 12:00am PDT
An all-optical cryptographic device for secure communication, based on the properties of soliton beams, is presented. It can encode a given bit stream of optical pulses, changing their phase and...
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A Novel Digital Rights Management Scheme in P2P Networks
November 16, 2010, 12:00am PST
P2P networking is a distributed application architecture that partitions tasks or workloads between peers. How to integrate P2P networks and DRM to offer a novel content distribution mode for...
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Optimal Spacing Design for Pilots in OFDM Systems Over Multipath Fading Channels
November 1, 2010, 12:00am PDT
In wireless Orthogonal Frequency Division Multiplexing (OFDM) systems, the time-varying channel is often estimated by algorithms based on pilot symbols. Such an estimator, however, requires...
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Locating Mobile Users Using Base Stations of Cellular Networks
November 1, 2010, 12:00am PDT
The location of mobile users served by cellular networks is considered. The chosen approach assumes that location is estimated through angular triangulation with three Base Stations (BSs). New...
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SimNP: A Flexible Platform for the Simulation of Network Processing Systems
November 1, 2010, 12:00am PDT
Network processing plays an important role in the development of Internet as more and more complicated applications are deployed throughout the network. With the advent of new platforms such as...
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Embedding Authentication & Authorization in Discovery Protocols for Standard Based Publish/Subscribe Middleware: A Performance Evaluation
February 15, 2011, 12:00am PST
Standard based Pub/Sub middleware, such as OMG Data Distribution Service (DDS), could assume a key role in supporting computer communications requiring continuous state information updating,...
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Pilot Placement for Time-Varying MIMO OFDM Channels With Virtual Subcarriers
February 1, 2011, 12:00am PST
The rapid time-variation of a fading multipath environment can impair the performance of Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO OFDM). This paper proposes...
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Multi-Branch Fractional Multi-Bit Differential Detection of Continuous Phase Modulation With Decision Feedback
February 1, 2011, 12:00am PST
Differential detection of continuous phase modulation suffers from significant intersymbol interference. To reduce bit error rate, Multi-branch Fractional Multi-bit Differential Detection (MFMDD)...
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Statistical Recognition Method of Binary BCH Code
February 1, 2011, 12:00am PST
In this paper, a statistical recognition method of the binary BCH code is proposed. The method is applied to both primitive and non-primitive binary BCH code. The block length is first recognized...
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Efficient Power Loading in MIMO-OFDM Based Cognitive Radio Networks
February 1, 2011, 12:00am PST
Due to their spectrum shaping capability and high adaptability, the multi-carrier systems are considered as prime candidates for use in the Cognitive Radio (CR) networks. In these structures, the...
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Fast Sparse Multipath Channel Estimation with Smooth L0 Algorithm for Broadband Wireless Communication Systems
February 1, 2011, 12:00am PST
Broadband wireless channels are often time dispersive and become strongly frequency selective in delay spread domain. Commonly, these channels are composed of a few dominant coefficients and a...
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On Synchronization of Pinning-Controlled Networks With Reducible and Asymmetric Coupling Matrix
May 1, 2011, 12:00am PDT
Complex dynamical networks are found to be common systems in the real world, such as genetic regulatory networks, biological neural networks, telephone graphs, etc. Therefore, lots of researchers...
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On Time-of-Arrival Statistic of Gaussian Channel Model
May 1, 2011, 12:00am PDT
A model of an angle-spread source, termed the "Gaussian Channel Model" is considered. The cumulative distribution function of the Time-of-Arrival of the multipath components is derived for an...
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Design and Simulation of a Secure and Robust Underwater Acoustic Communication System in the Persian Gulf
May 1, 2011, 12:00am PDT
In recent years, UnderWater Acoustic (UWA) communications have received much attention as their applications have begun to shift from military toward commercial. Digital communications through UWA...
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TCP Window Based Congestion Control -Slow-Start Approach
May 1, 2011, 12:00am PDT
Transmission Control Protocol (TCP) has undergone several transformations. Several proposals have been put forward to change the mechanisms of TCP congestion control to improve its performance. A...
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A Preamble-Based Broadcasting Technique for Wireless Ad Hoc Sensor Networks
May 1, 2011, 12:00am PDT
Broadcasting is a fundamental operation in any wireless networks, more so in wireless ad hoc sensor net-works, where each sensor node has limited transmission range and battery power. Although...
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Evaluation of a Heterogeneous Sensor Network Architecture for Highly Mobile Users
May 1, 2011, 12:00am PDT
This paper presents experimental results of a heterogeneous sensor network architecture, which is a combination of a wireless sensor network and a personal area network. The proposed architecture...
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The Behaviour of Vertical Bell Laboratories Layered Space-Time Algorithm Combined With Multiuser Detection Schemes in Wireless Communication System
May 1, 2011, 12:00am PDT
This paper provides the performance analysis of multiuser Vertical Bell Laboratories LAyered Space-Time (V-BLAST) system receiver structures for Multiple-Input Multiple-Output (MIMO) channel at a...
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Maximizing Resilient Throughput in Peer-To-Peer Network
August 1, 2011, 12:00am PDT
A unique challenge in P2P network is that the peer dynamics (departure or failure) cause unavoidable disruption to the downstream peers. While many works have been dedicated to consider fault...
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Usage of Erlang Formula in IP Networks
August 1, 2011, 12:00am PDT
This paper is concerning of Erlang formulas practical approval and their usage with video flow transfer in IP networks. Erlang formulas were simulated in MATLAB program. Practical verification was...
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Survey on Spam Filtering Techniques
August 1, 2011, 12:00am PDT
In the recent years spam became as a big problem of Internet and electronic communication. There developed a lot of techniques to fight them. In this paper the overview of existing e-mail spam...
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A Effective Method for Properties Access in MAC Layer of ZigBee
August 1, 2011, 12:00am PDT
The attribute access methods of MAC layer in wireless communication network is researched. Aiming at conquering the problem of the shared ZigBee wireless channel resulting multi-channel device...
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MAC Sub-Layer Analysis With Channel Estimation in Broadband Power Line Communication
August 1, 2011, 12:00am PDT
Broadband Power Line Communication (BPLC) gained a lot of interest because of low cost and high performance communication network in access area. In this paper PHYsical (PHY) layer and Medium...
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Enterprise Service Bus: A Performance Evaluation
August 1, 2011, 12:00am PDT
The flexibility offered by an Enterprise Service Bus (ESB) in enabling various applications to exchange data makes it a very important middleware layer that is responsible for transporting data in...
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An Improved MPH-Based Delay-Constrained Steiner Tree Algorithm
August 1, 2011, 12:00am PDT
In order to optimize cost and decrease complexity with a delay upper bound, the delay-constrained Steiner tree problem is addressed. Base on the new Delay-Constrained MPH (DCMPH) algorithm and...
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Fast Handoff for 802.11 Wireless Network
November 1, 2011, 12:00am PDT
Whenever the mobile station moves from the range of one access point and comes to the range of another access point a handoff process is occurred. This process takes a long time when using the...
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Impact of Channel Dynamics, Combined Nonlinearities and ASE Noise on Transmission Performance of all Optical Star WDM Networks
November 1, 2011, 12:00am PDT
For all optical Wavelength Division Multiplexing (WDM) network based on G.653 fibers, the authors investigate the quality factor deterioration due to combined nonlinear effects and Amplified...
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Turbo Codes A New PCCC Design
November 1, 2011, 12:00am PDT
Coding techniques have always been a major area of scientific interest. Due to this interest, many coding schemes were invented. Eventually, their implementation in various systems contributed in...
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An Enhanced Secure Heuristic-Stochastic Routing Arithmetic in MPLS Network
November 1, 2011, 12:00am PDT
To improve routing security in MPLS network, base on the stochastic routing algorithm, the authors propose a proactive mechanism they call Enhanced Secure Heuristic-Stochastic Routing (ESHSR),...
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Application of Heuristic (1-Opt Local Search) and Metaheuristic (Ant Colony Optimization) Algorithms for Symbol Detection in MIMO Systems
November 1, 2011, 12:00am PDT
Heuristic and metaheuristic techniques are used for solving computationally hard optimization problems. Local search is a heuristic technique while Ant Colony Optimization (ACO), inspired by the...
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Sequential Tests for the Detection of Voice Activity and the Recognition of Cyber Exploits
November 1, 2011, 12:00am PDT
The authors consider the problem of automated Voice Activity Detection (VAD), in the presence of noise. To attain this objective, they introduce a Sequential Detection of Change Test (SDCT),...
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