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(140 results)-
Whitepapers
A Sustained QoS Solution by Contention Adaptation in IEEE 802.11e Wireless LANs
October 1, 2011, 12:00am PDT
The most significant issue in 802.11 contention based networks is to prevent collisions and to ensure connection quality. Researchers have shown an increased interest in collision aware back-off...
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Whitepapers
IPSD: New Coverage Preserving and Connectivity Maintenance Scheme for Improving Lifetime of Wireless Sensor Networks
January 1, 2012, 12:00am PST
In many applications it is necessary to have some guarantees on the coverage, connectivity and lifetime of the Wireless Sensor Networks (WSN). Coverage problem is regarding how to ensure that each...
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Whitepapers
Algorithmic Vertical Handoff Decision and Merit Network Selection Across Heterogeneous Wireless Networks
January 1, 2013, 12:00am PST
Next generation wireless networks must be able to coordinate services between heterogeneous networks through multi-mode mobile terminals. Such heterogeneity poses a challenge to seamless handover...
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Whitepapers
Performance Comparison of Spreading Codes in Linear Multi-User Detectors for DS-CDMA System
February 1, 2013, 12:00am PST
Direct Sequence Code Division Multiple Access (DS-CDMA) system is well known wireless technology. This system suffers from MAI (Multiple Access Interference) caused by Direct Sequence users....
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Whitepapers
Cross-Layer Packet Dependent OFDM Scheduling Based on Proportional Fairness
January 1, 2012, 12:00am PST
OFDM is one of the main techniques in the future telecommunication system. Scheduling is a technique which supports multi-user data transferring, which provides a mechanism among users competing...
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Whitepapers
Low-Energy-Transmission of Data on Submicron Interconnects
January 1, 2012, 12:00am PST
The authors present in this paper a CAD tool that aims at designing low-energy buses. The Graphical User Interface (GUI) they developed manages many techniques dealing with the addressed problem:...
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Whitepapers
Video Multicast Over Wireless Ad Hoc Networks
January 1, 2012, 12:00am PST
Existing video multicast routing protocols in wireless ad hoc networks have been developed under the assumption that destination nodes wish to receive all the information sent by the multicast...
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Whitepapers
A Cost Effective Approach for WDM Network Protection Under Critical Duct Constraints
March 1, 2012, 12:00am PST
In this paper, protection strategies of WDM networks are viewed from a cost perspective. The goal is to minimize the network cost while ensuring the network survivability. In WDM networks, multi...
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Whitepapers
Analysis of Subcarrier and Antenna Power Allocation for MIMO WPMCM System With Sphere Decoder
March 1, 2012, 12:00am PST
In order to achieve the efficient usage of the available bandwidth in wireless environments, the best method for real time application would be combining Multi-Input Multi-Output (MIMO) and...
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Whitepapers
A Framework for Configuration and Management of Quality-of-Service (Qos) in Wireless Zigbee Networks
April 1, 2012, 12:00am PDT
The low cost, low power, low complexity Zigbee defined in IEEE standard 802.15.4 for low rate WPAN's upon MAC and physical layer. The objective is to make possible of incalculable process among...
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Whitepapers
Reduced Complexity Max Norm Based PAPR Optimization in OFDM Systems
May 1, 2012, 12:00am PDT
Orthogonal Frequency Division Multiplexing (OFDM) is a suitable multicarrier modulation scheme for high speed broadband communication systems. OFDM provides bandwidth efficiency and robustness...
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Whitepapers
A Two State Proactive Transport Protocol for Satellite Based Networks
May 1, 2012, 12:00am PDT
In satellite-based networks, current TCP Protocols have lower throughput performance mainly due to the effect of long propagation delays and high link error rates. In this paper, a new congestion...
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Whitepapers
Construction Methods of Closed Users Group Using Multi-Party Protocol
May 1, 2012, 12:00am PDT
In recent years, the Internet has become the most important infrastructure in the information society. Until now, a client-server system such as e-mail or WWW that is offered by a fixed service...
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Whitepapers
Encoding Schemes for Memory Efficient Quasi Cyclic Low Density Parity Check Codes
June 1, 2012, 12:00am PDT
Low Density Parity Check (LDPC) codes have attracted current researchers due to their excellent performance and capability of parallel decoding. One major criticism concerning LDPC codes has been...
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Whitepapers
Design of a Quasi-Cyclic LDPC Decoder Using Generic Data Packing Scheme
June 1, 2012, 12:00am PDT
This paper proposed a generic data packing scheme for quasi-cyclic LDPC codes decoder which has two advantages. Firstly, in this scheme no shift network is needed, it greatly reduces the area of...
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Whitepapers
A Novel QoS Aware RWA With Dedicated Path Protection Consideration for All Optical Networks
July 1, 2012, 12:00am PDT
In all optical networks, signals has to travel over long distances and Physical Layer Impairments (PLI) accumulate as regeneration capability is not available. During transmission, Quality of...
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Whitepapers
Real Time Position Location & Tracking (PL&T) Using Prediction Filter and Integrated Zone Finding in OFDM Channel
July 1, 2012, 12:00am PDT
The nature of pre-determined and on-demand mobile network fabrics can be exploited for Position Real time Location Tracking (PL&T) of radios and sensors (nodes) for Global Positioning System (GPS)...
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Whitepapers
QoS Based OVPN Connection Set Up and Performance Analysis
August 1, 2012, 12:00am PDT
Due to high demand of Optical Virtual Private Network (OVPN) connection setup with guaranteed Quality of Service (QoS) requirement, it is necessary to provide such application by the provider...
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Whitepapers
Adaptive Three-Layer Weighted Links Routing Protocol for Secure Transmission Over Optical Networks
August 1, 2012, 12:00am PDT
Bandwidth, latency and data security are the three major factors that affect the Quality of Service (QoS) for any computer network. Different applications running on a network have different...
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Whitepapers
Analysis of Indoor Wireless Infrared Optical CDMA LAN Using Prime Codes
August 1, 2011, 12:00am PDT
In wireless optical system, CDMA suits well for high bit rate systems where good security is needed and mobility is not important. It would be economical when compared to radio frequency band and...
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Whitepapers
Improving Connectivity and Resilience Using ECC Based Key Predistribution for Deployment Knowledge Based WSN
September 1, 2012, 12:00am PDT
Wireless sensor networks consist of small nodes with sensing, computation and communication capabilities, often deployed in remote inaccessible areas to interact with the environment and forward...
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Whitepapers
Enhanced Energy Efficient Privacy Provisioning in WSN
July 1, 2012, 12:00am PDT
Privacy provisioning along with the core functionality of WSN including routing of the sensed data through predetermined optimized routes to the base station which produces pronounced traffic near...
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Whitepapers
Secure Communication Method Using Invitation Process in Mobile Ad Hoc Networks
September 1, 2012, 12:00am PDT
The importance of security in mobile ad hoc networks has been recognized for many years, and many secure routing methods have been proposed in this field. This paper discusses major security...
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Whitepapers
The Effect of Interference on Bluetooth Data Exchange Over WLAN
October 1, 2012, 12:00am PDT
The paper focuses on studying Bluetooth Wireless Personal Area Network (WPAN) and Wireless Local Area Network (WLAN) technologies to make Bluetooth data exchange over WLAN applicable. In...
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Whitepapers
The RAM-Based Web Proxy Servers
October 1, 2012, 12:00am PDT
The conventional web proxy servers use hard disk as their primary cache storage. However, as disks use mechanical operations, they are typically the slowest component of the servers. Though, in...
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Whitepapers
An SLM Based PAPR Reduction Method Using New Volterra Predistorter Model in the OFDM System
October 1, 2012, 12:00am PDT
Orthogonal Frequency Division Multiplexing (OFDM) is a strong candidate for future wireless communication because it is marked by its higher frequency multiplicity and greater immunity to...
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Whitepapers
Performance Analysis and Comparison of Spreading Codes in Linear Multi-User Detectors for DS-CDMA System
November 1, 2012, 12:00am PDT
The tremendous increase in demand for wireless services has caused a search for techniques to improve the capacity of current digital communication systems. To bring this vision for future, the...
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Whitepapers
Performance and Capacity Analysis of MIMO System at 5 GHz and 60GHz in Indoor Environment
November 1, 2012, 12:00am PDT
The MilliMeter Wave (MMW) band much useful for wireless indoor communications as it offers a large amount of license free spectrum. Blockage by walls and furniture limits the range indoors, the...
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Whitepapers
Feedforward Networks Based Straightforward Hierarchical Routing in Solar Powered Wireless Sensor Networks
January 1, 2011, 12:00am PST
Wireless sensor networks play an important role in monitoring and collecting data from difficult geographical terrains. They find useful applications in various fields ranging from environmental...
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Whitepapers
Strategic Management Using VoIP Technology: A Case Study in a Call Center Company
January 1, 2011, 12:00am PST
The ability of voice transmission over TCP/IP package, also called Voice over IP or VoIP, allows voice integration and data in just one structure; this enables a very cheap communication among...
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Whitepapers
Allocation Algorithm for Optimizing MC-CDMA Over Correlated Channel
February 1, 2011, 12:00am PST
In this paper, the authors address the problem of MAI (Multiple Access Interference) degrading the performance of a downlink MC-CDMA system in a frequency selective fading channel. Their objective...
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Whitepapers
Small Size Defected Ground Structure (DGS) Coupled Resonator Band Pass Filters With Capacitor Loaded Slot Using FDTD Method
March 1, 2011, 12:00am PST
This paper presents a design of a small size second and third order band pass coupled resonator filters by using Finite Difference Time Domain method (FDTD). Two of the proposed filters consist of...
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Whitepapers
Radio Access Network Power Management Considering Radio Over Fiber Technique for 4G Mobile System
March 1, 2011, 12:00am PST
Radio over fiber technique was suggested as excellent candidates for 4G radio access network considering large number mobile users. With higher number of base stations, a microwave link presents...
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Whitepapers
Optimal Design of Virtual MIMO for WSN Performance Improvement
April 1, 2011, 12:00am PDT
In this paper, the authors studied the performance of Bit Error Rate (BER) for a virtual Multiple-Input Multiple-Output (MIMO) based communications architecture. As a case, wireless sensor...
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Whitepapers
Effect of Constraint Length and Code Rate on the Performance of Enhanced Turbo Codes in AWGN and Rayleigh Fading Channel
May 1, 2011, 12:00am PDT
Turbo Coding (TC) has been adopted as a channel coding scheme for several 3G mobile systems, in particular 3GPP (Third Generation Partnership Project) and in upcoming 4G standards for high data...
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Whitepapers
An Optimal Gain Control Scheme for Digital On-Channel Repeater With Feedback Interference Canceller in Digital Terrestrial Television Broadcasting Networks
May 1, 2011, 12:00am PDT
In this paper, a new gain control scheme is proposed for a Digital On-Channel Repeater (DOCR) with a Feedback Interference Canceller (FIC) in Digital Terrestrial Television Broadcasting (DTTB)...
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Whitepapers
User Based Resource Scheduling for Heterogeneous Traffic in the Downlink of OFDM Systems
May 1, 2011, 12:00am PDT
Besides avoiding inter-symbol interference and leading to high capacity, wireless Orthogonal Frequency Division Multiplexing (OFDM) provide fine granularity for resource allocation since they are...
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Whitepapers
Reducing Wastage Capacity in OVSF Based CDMA Networks Using Dynamic Rake Combiners
June 1, 2011, 12:00am PDT
Orthogonal Variable Spreading Factor (OVSF) codes in CDMA networks are designed to handle quantized data rates. Handling non-quantized data rates in such networks leads to code capacity wastage if...
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Whitepapers
Inter Cluster Distance Management Model With Optimal Centroid Estimation for K-Means Clustering Algorithm
June 1, 2011, 12:00am PDT
Clustering techniques are used to group up the transactions based on the relevancy. Cluster analysis is one of the primary data analysis method. The clustering process can be done in two ways such...
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Whitepapers
Improvement of Li-Hwang's Biometrics-Based Remote User Authentication Scheme Using Smart Cards
July 1, 2011, 12:00am PDT
Password authentication is one of the mechanisms that have been widely used to authenticate a legitimate user. If the remote users want to login to a remote server for its resources and services,...
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Whitepapers
Investigating the Impacts of Digital Elements in Web Information for Socio-Informatics
September 1, 2010, 12:00am PDT
The Web offers enormous amount of digital information for communication and socializing. The fact that Web has been able to provide users with instant and global access to shared information, this...
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Whitepapers
Comparative SAR Assessment in Adults and Children Exposed to Electromagnetic Fields of Radio Frequency Devices
February 1, 2010, 12:00am PST
Exposure to radio frequency electromagnetic fields has raised scientific and public concern regarding possible adverse effects to people exposed to such radiation. At cellular mobile communication...
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Whitepapers
On the Minimum Number of Users for the Generation of H-SS Traffic in a Simulation Scenario
January 1, 2010, 12:00am PST
Simulation plays an important role for the design, performance evaluation and dimensioning of computer networks. Diverse network features can be studied with the aid of simulation scenarios....
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Whitepapers
Limitations of Current 4G Systems and Its Substitute Schemes with TDD/TDMA
December 1, 2007, 12:00am PST
In current 4G system given in recent literatures, channel estimation overhead and complexity of Multi-User Detectors (MUD), may lead to bad performance in fast fading channel scenarios when large...
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Whitepapers
Performance Improvement of Synchronous Multiuser Communication Systems by Using Process Sharing Techniques
December 1, 2007, 12:00am PST
In this paper, the authors presents new techniques that improve the performance of Code Division Multiple Access (CDMA) system for transmission of digital data over time varying channels such as...
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Whitepapers
A Blind Source Separation Based Cryptography Scheme for Mobile Military Communication Applications
December 1, 2008, 12:00am PST
Security in digital transmission is an increasingly interesting topic in a number of fields. In many cases, however, the need for security is forfeited due to the high complexity of commonly used...
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Whitepapers
Algorithms for Locating GPS Coordinates on PDA
December 1, 2008, 12:00am PST
The purpose of the authors' paper is to find algorithms for loading large maps on PDA and place on it the geographical location given by latitude and longitude. C++ and C# programming languages...
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Whitepapers
Optimization of Application QoS Protocols for 3G/4G Mobile Networks
September 1, 2008, 12:00am PDT
The importance of Quality of Service (QoS) provisioning has become one of the central issues of 3G/4G mobile network design and analysis. Mobile multimedia applications have high demands in terms...
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Whitepapers
Inter-Cell Interference for Reverse Link in WCDMA
September 1, 2008, 12:00am PDT
The Personal Communications Systems PCS are based on three techniques: Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA) and Code Division Multiple Access (CDMA). The...
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Whitepapers
The Laser Satellites Communications and Laser Noises
August 1, 2008, 12:00am PDT
The gain of advanced optical communication systems is reduced by the noise of optical source. Coherent optical communication systems are in particular very sensitive to the noise transmitter and...
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Whitepapers
A Study of Propagation Effects in a Wireless Test Bed
August 1, 2008, 12:00am PDT
The paper discusses several effects influencing the propagation in a laboratory wireless test bed and also aspects important for designing and setting up the wireless test bed with space...
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Whitepapers
OFDM System Under the Combined Effect Analysis of the Phase Noise, Carrier Frequency Offset, Doppler Spread, and Amplifier Nonlinearity of the SEL
July 1, 2008, 12:00am PDT
In this paper, the authors provide an exact closed-form expression of the effective Signal-to-Noise Ratio (SNR) for Orthogonal Frequency Division Multiplexing (OFDM) performance under the combined...
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Whitepapers
A Unified Approach for Heterogeneity and Node Fault Robustness in Dynamic Sensor Networks
July 1, 2008, 12:00am PDT
In this paper, the authors deals with the area coverage problem for a network of mobile sensors. Continuous mobility is used for getting measures over the area of interest with a reduced number of...
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Whitepapers
Redundant Data Transmission and Nonlinear Codes
June 1, 2008, 12:00am PDT
In this paper, the authors investigate redundant data transmission protected by arbitrary (not necessarily linear) codes. They generalize results known so far for linear codes, in particular for...
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Whitepapers
Time Synchronizing Signal by GPS Satellites
May 1, 2009, 12:00am PDT
In many industrial and trading activities such as navigation, mapping, power distribution, telecommunication, weather station, digital radio, industrial control systems and research centers one of...
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Whitepapers
A Review for Uniqueness and Variations in Throughput of MANET Routing Protocol Due to Performance Metrics, Characteristics and Simulation Environments
May 1, 2008, 12:00am PDT
Very prestigious work has been performed in the field of Mobile Ad-hoc NETworks (MANETS) with respect to their routing protocols. Researchers have developed and designed so many protocols for...
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Whitepapers
Performance Evaluation of SIP Based Handover in Heterogeneous Access Networks
May 1, 2008, 12:00am PDT
Wireless technologies evolve very fast in last years. In the future operators will need to enable users to use communications services independent from access technologies, thus they will need to...
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Whitepapers
Analysis, Design and Simulation of a Log Periodic Antenna for Mobile Communication Bands
May 1, 2008, 12:00am PDT
The Log-Periodic loop Antenna (LPA) is investigated as a new type of antenna, whose properties vary periodically with the logarithm of frequency and provides wide bandwidth, broad beam width, and...
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Whitepapers
Cell Planning in GSM Mobile
May 1, 2008, 12:00am PDT
Cell planning in GSM mobile system is one of the most important operations must be done before the installation of the system. Cell planning means studying the geographic area where the system...
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Whitepapers
Modified Pulse 2.45 Fractal Microstrip Antenna
April 1, 2008, 12:00am PDT
In this paper, the idea of space-filling properties of the fractal is used to minimize the area of a microstrip rectangular patch antenna operating at 2.45GHz. The first iteration is in the form...
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Whitepapers
Analytic Solution of Nadir Attitude Pointing for LEO Microsatellite
April 1, 2008, 12:00am PDT
A spacecraft in orbit always needs to stabilize the attitude against the external disturbance torques acting on it. Attitude control usually needs to be autonomous or semi-autonomous. On Alsat-1,...
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Whitepapers
Analysis of Non-Linear Response in DS-CDMA Satellite Systems
April 1, 2008, 12:00am PDT
The nature of Frequency Division Multiple Access (FDMA) implies that the receiver channel has to amplify a set of carriers in frequency intervals. Satellite systems with Code Division Multiple...
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Whitepapers
The System Transfering Between Laser-Satellites
March 1, 2008, 12:00am PST
Laser inter-satellite communication is on the verge of becoming a reality. It will be a key building block for wide-area space data networks of the future. Design methodologies treating these as...
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Whitepapers
Middleware Design of Bandwidth Constrained QoS Model for Multi Hop Ad Hoc Networks
February 1, 2008, 12:00am PST
Middleware is actually a resource manager that guarantees the implementation of all policies, contracts to be satisfied and it ensures that contracts do not go beyond the limits of network...
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Whitepapers
Two-Valued Integrand Coding Transmission of Multi-Rate Quasi-Synchronous CDMA Signals Convolved by Real-Valued Self-Orthogonal Finite-Length Sequences
February 1, 2008, 12:00am PST
The next generation mobile communication system is desired to transmit multimedia information at multi-rate. Two-valued integrand codes are applied to the realization of the multi-rate...
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Whitepapers
Yaw Phase Mode Attitude Control Using Z Wheel for LEO Microsatellite
February 1, 2008, 12:00am PST
A control system is proposed for a low Earth orbit gravity gradient stabilized microsatellite using Z wheel. The microsatellite is 3-axis stabilized using a yaw reaction wheel with dual redundant...
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Whitepapers
Information-Theoretic Comparison of Channel Capacity for FDMA and DS-CDMA in a Rayleigh Fading Environment
February 1, 2008, 12:00am PST
In this paper, a comparative estimate of the channel capacity assigned to each user for Frequency-Division Multiple-Access (FDMA) and Direct-Sequence Code-Division Multiple-Access (DS-CDMA)...
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Whitepapers
Energy Balancing by Combinatorial Optimization for Wireless Sensor Networks
February 1, 2008, 12:00am PST
Due to the recent advances in electronics and wireless communication, the development of lowcost, low-power, multifunctional sensors have received increasing attention. In this paper, novel...
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Whitepapers
Software Defined Adaptive Codec for Cognitive Radio
December 1, 2009, 12:00am PST
Recently, cognitive radio has been proposed as a promising technology to improve spectrum utilization. A highly flexible SDR (Software Defined Radio) system needs to configure each of its blocks...
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Whitepapers
The Effect of an Enhanced Channel Assignment Algorithm on an IEEE 802.11 WLAN
December 1, 2009, 12:00am PST
In this paper, a channel-assignment algorithm at the Access Points (APs) of a Wireless Local Area Network (WLAN) is proposed in order to maximize Signal-to-Interference Ratio (SIR) at the user...
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Whitepapers
Network Coding: An Excellent Approach for Overloaded Communication Era
December 1, 2009, 12:00am PST
Data flow in graphs is one of the most principle challenges faced by computer scientists and mathematicians. The problem of data flow in a graph has many practical applications e.g. routing in...
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Whitepapers
Performance Evaluation Model of Optimization Methods for Wireless Sensor Networks
October 1, 2009, 12:00am PDT
Wireless sensor networks are often composed of large number of wireless sensor nodes that are mostly using battery supplies. Nodes are small and equipped with sensors that cooperatively monitor...
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Whitepapers
Simulation and Modeling of Packet Loss on VoIP Traffic: A Power-Law Model
October 1, 2009, 12:00am PDT
Voice over IP (VoIP) is now available on many IP networks carriers in the world with lower cost compared to Public Switched Telephone Network (PSTN). However, current IP networks only offers...
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Whitepapers
Analytical Description of a Parameter-Based Optimization of The Quality of Service for VoIP Communications
September 1, 2009, 12:00am PDT
In this paper, the perceived quality of VoIP communications is studied. The distributions of the number of consecutive received and lost packets, respectively named gap and burst, of a VoIP...
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Whitepapers
QoS Management in Experimental Environment
September 1, 2009, 12:00am PDT
New applications usually combine interactivity and multimedia resulting in a huge diversity of possible services. The negotiated Quality of Service should be result of application/user...
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Whitepapers
Energy-Aware Secure Routing for Large Wireless Sensor Networks
September 1, 2009, 12:00am PDT
Wireless Sensor Networks (WSN) are vulnerable to a wide set of attacks which threaten the network operation. Although communication and security technologies for computer networks have reached a...
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Whitepapers
GIS Supporting the Plan of BTS (Base Transceiver Stations) for Mobile Network in Urban Context
August 1, 2009, 12:00am PDT
In recent years the technological development in general and the spread on the territory of antennas for mobile phones urged a state of widespread public concern repeatedly verging the social...
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Whitepapers
Extended Kalman Filtering and Phase Detector Modeling for a Digital Phase-Locked Loop
August 1, 2009, 12:00am PDT
The realization of a Digital Phase-Locked Loop (DPLL) requires to choose a suitable phase detector and to design an appropriate loop filter; these tasks are commonly nontrivial in most...
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Whitepapers
WiMAX Integration in NGN Network, Architecture, Protocols and Services
July 1, 2009, 12:00am PDT
With growing demands for fast provision of new and complex services, imposed by life and business dynamic in general, service providers are forced to adopt open technologies and advanced business...
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Whitepapers
The First Millimeter-Wave Point-to-Point Wireless Gigabit Ethernet Communication System at TMR&D
July 1, 2009, 12:00am PDT
Every new generation of wireless networks require more and more cell-sites that are closer and closer together combined with the fast growing demand for the capacity of the transmission links....
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