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TELFOR
(56 results)-
Whitepapers
QoE Dimensions and QoE Measurement of NGN Services
November 25, 2010, 12:00am PST
In varying environment such as nowadays packet-based communications, providing NGN (Next Generation Network) services with quality as in traditional voice communications to users with high...
Provided by TELFOR
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Whitepapers
EGPRS - Based Design Solution for Tariff Transparency Issue in Mobile Number Portability
November 25, 2010, 12:00am PST
Mobile number portability is one of the major developments in the past twelve years of telecommunication industry. Introduction of this technology enabled consumer to switch from one service...
Provided by TELFOR
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Whitepapers
Multidimensional and Adaptive Non-Intrusive Anomaly Detection in Network Services
November 25, 2010, 12:00am PST
Performance monitoring and anomaly detection is critical for today's complex network services. However, conventional detection mechanisms like thresholding for single parameters do not deal well...
Provided by TELFOR
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Whitepapers
Advanced Routing Concept Performance Analysis
November 25, 2010, 12:00am PST
Today's world of modern technologies and high communication speeds demands researching new ways of augmenting networking hardware and software routing performance. This paper proposes combining...
Provided by TELFOR
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Whitepapers
LocBiometrics: Mobile Phone Based Multifactor Biometric Authentication With Time and Location Assurance
November 25, 2010, 12:00am PST
The continuing growth of Smartphones and Super phones has significantly increased m-Commerce. The security of personal information on the phone and lack of the face-to-face identification has made...
Provided by TELFOR
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Whitepapers
Fuzzy CAC Adaptation for Effective Traffic Control in GMPLS Networks
November 25, 2010, 12:00am PST
This paper presents the report of some issues on adaptation techniques of the specific implementation of fuzzy-CAC algorithm over an RSVP-TE agent that can be used in GMPLS network domain. The...
Provided by TELFOR
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Whitepapers
Reliable and Reconfigurable Wi-Fi Monitoring Network Based on Software Agents
November 25, 2010, 12:00am PST
So far, researchers, have not been able to agree upon a common definition for software agents, defining them according to their own point of view. Russell and Norvig define an agent as performing...
Provided by TELFOR
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Whitepapers
A Fuzzy Logic-Based Energy Efficient Scheme for Real-Time Packet Transmission InWSN
November 25, 2010, 12:00am PST
Timeliness and energy efficiency are two important parameters of Quality of Service (QoS) in Wireless Sensor Network (WSN). So, making optimal choices for realtime and energy efficient packet...
Provided by TELFOR
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Whitepapers
Characteristics and Measurements of Optical Fibers
November 25, 2010, 12:00am PST
The optical fibers today are ultimately used on long distances in case of intercontinental and national backbone segments of the telecommunication networks. Additionally, they are implemented in...
Provided by TELFOR
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Whitepapers
Performance Evaluation of Frequency Reuse Schemes in LTE Based Network
November 25, 2010, 12:00am PST
In this paper, the authors focus on LTE, which is a development under 3G technologies Release-8 of the 3GPP Project plan and is considered a baseline and step towards the LTE-Advanced. In this...
Provided by TELFOR
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Whitepapers
Priority Handover Schemes in Wireless Mobile Networks
November 25, 2010, 12:00am PST
The mobility is one of the most important features of a wireless cellular communication system. Usually, continuous service is achieved by supporting handover from one cell to another. Handover is...
Provided by TELFOR
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Whitepapers
Open Loop Sensor Based System Used for Mitigation of Cross-Tier Interference in Femtocell Networks
November 25, 2010, 12:00am PST
The paper is concerned with the study of the cross-tier interference between the femtocell and macrocell layers of a mobile communications network. The main point of interest is consisted by the...
Provided by TELFOR
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Whitepapers
Power and Spectral Efficiency Advantages of OFDM/OQAM Over OFDM/QAM for PHY in Wireless and Cognitive Radio Networks
November 25, 2010, 12:00am PST
This paper addresses aspects of power and spectral efficiency advantages of OFDM/OQAM over the conventional OFDM (with QAM) signaling and accessing format for wireless networks and Cognitive Radio...
Provided by TELFOR
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Whitepapers
Performance Comparison of OFDMA and CDMA Access Technologies in Broadband Wireless Communication Networks
November 25, 2010, 12:00am PST
In this paper overview of the OFDMA and CDMA access technologies in variety of Broadband Wireless Communication Networks is given. It also makes comparison of advantages and disadvantages of OFDMA...
Provided by TELFOR
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Whitepapers
Spreading Sequence Adaptation for Dynamic MC-CDMA Systems
November 25, 2010, 12:00am PST
The high data rate communication systems require modulation techniques that improve the band efficiency and system robustness against fading. One of the modulation methods that can be used to...
Provided by TELFOR
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Whitepapers
Capacity Bounds and Achievable Rates of the Gaussian Relay Channel
November 25, 2010, 12:00am PST
In traditional wireless communication systems, the physical level is regarded as a point-to-point channel that reliably transmits information from one device to another device. The authors present...
Provided by TELFOR
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Whitepapers
MAC Protocol Requirements for WLAN's With Beamforming
November 25, 2010, 12:00am PST
Beamforming is a method of intensifying Radio Frequency (RF) energy at desired places, such as the receiver position, in order to improve the Signal-to-Noise Ratio (SNR) there. Beamforming may...
Provided by TELFOR
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Whitepapers
An Indoor Positioning System Based on a WiFi Router and FM Beacons
November 25, 2010, 12:00am PST
The location of a mobile user has become an important requirement for modern applications in the area of ubiquitous computing. The Global Positioning System (GPS) is still the leading technology...
Provided by TELFOR
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Whitepapers
Single-Hop Vs. Multi-Hop - Energy Efficiency Analysis in Wireless Sensor Networks
November 25, 2010, 12:00am PST
Wireless sensor networks are networks of devices with restrained resources, used for environmental, military, automation and home applications. Radio transceiver is one of the biggest power...
Provided by TELFOR
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Whitepapers
Performances of the OFDM/QPSK System With MBDD in the Presence of Frequency Offset
November 25, 2010, 12:00am PST
In this paper, the authors present the basic characteristics of Orthogonal Frequency Division Multiplex (OFDM) systems with Quadrature Phase Shift Keying (QPSK) modulation and Multi-Bit...
Provided by TELFOR
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Whitepapers
Moments of the Signal After Micro-And Macrodiversity Processing in Gamma Shadowed Nakagami-M Fading Channels
November 25, 2010, 12:00am PST
This paper studies wireless communication system with micro- and macro-diversity reception in gamma shadowed Nakagami-m fading channels. N-branch Maximal-Ratio Combining (MRC) is implemented at...
Provided by TELFOR
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Whitepapers
Parameters Optimization of a Newly Proposed DQPSK Receiver
November 25, 2010, 12:00am PST
Modern mobile links are characterized by frequency selectivity due to multipath propagation, as well as time selectivity arising from relative transmitter-receiver motion, oscillator drifts, or...
Provided by TELFOR
-
Whitepapers
Optimal Joint Routing and Power Allocation for Decode-and-Forward Multi-Hop Networks
November 25, 2010, 12:00am PST
A novel cross-layer routing protocol is presented for Decode-and-Forward multi-hop relaying systems which lead to optimal power allocation for a given power budget by maximizing the capacity of...
Provided by TELFOR
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Whitepapers
Near-Optimal Joint Routing and Power Allocation for Amplify-and-Forward Multi-Hop Networks
November 25, 2010, 12:00am PST
In this paper, the authors developed a sub-optimal algorithm for joint routing and power allocation for an amplify-and-forward multi-hop relay network. The objective function for the optimization...
Provided by TELFOR
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Whitepapers
A Solution for Radio Data Transmission Problem in Electrical Substation Remote Control
November 25, 2010, 12:00am PST
In SCADA systems many different protocols for data transmission between a control center and electrical substations are used. (IEC101, DNP3, ADLP-80, ADLP-180, MODBUS). Generally, there is no rule...
Provided by TELFOR
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Whitepapers
Distributed Sensor Networks: An Approach
November 25, 2010, 12:00am PST
During last years, several activities have taken place in order to monitor environmental changes with the aim of supporting the ordinary activities in the territory administration. This has...
Provided by TELFOR
-
Whitepapers
Scheduling in Optical Packet Rings
November 25, 2010, 12:00am PST
In the metropolitan area, traditional SONET/SDH circuit switched rings are likely to be replaced with optical packet/burst switching technologies. In this paper, the authors consider a slotted WDM...
Provided by TELFOR
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Whitepapers
Tunable UDWDM Transmitter With Optical Comb Source
November 25, 2010, 12:00am PST
In fiber optical communications, high capacity transmission is one of the main challenges. Wavelength Division Multiplexing (WDM) is a key technology for effective utilization of fiber bandwidth...
Provided by TELFOR
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Whitepapers
Measurement of the Microwave Permittivity of Polymer Materials for High-Speed Optical Modulator Design
November 25, 2010, 12:00am PST
Metropolitan access communications systems are currently looking on high data rate capabilities. Moreover, optical networks are and will be undoubtedly used. Depending on requested data rates and...
Provided by TELFOR
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Whitepapers
Improved Multiuser Wireless Video Streaming by Considering Influence on a Subsequent Frame
November 25, 2010, 12:00am PST
This paper gives contribution to improvement of h.264 downlink multiuser video streaming over wireless channels. The improvement is achieved by including the influence of packet loss on the...
Provided by TELFOR
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Whitepapers
Modelling Software-Intensive Ingest System: Behavioural Description and Domain Model
November 25, 2010, 12:00am PST
The new model of television production is based upon: digital formats, the centralized management of media content and associated metadata, non-linear assembly of media elements, high-speed...
Provided by TELFOR
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Whitepapers
Development of Secure LZW Technique for Secret Compressed Data Transmission
November 25, 2010, 12:00am PST
Compression algorithms reduce the redundancy in data representation to decrease the storage required for that data. Data compression offers an attractive approach to reducing communication costs...
Provided by TELFOR
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Whitepapers
Zigbee Home Light Controller Implementation and Verification on Digital TV Receiver
November 25, 2010, 12:00am PST
Lighting control presents a small part of home automation control systems. The main goal of home automation systems is to enable home devices to communicate with each other and to do some actions...
Provided by TELFOR
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Whitepapers
An Example of Secure Java Based Mobile Application
November 25, 2010, 12:00am PST
In this paper, a design and implementation of a JAVA application on mobile phones that securely connect to Web services is described. The authors considered a Web service scenario where mobile...
Provided by TELFOR
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Whitepapers
Implementation of a Universal Framework for Deployment, Debugging and Control of Applications on DSP Targets
November 25, 2010, 12:00am PST
Continuously growing demand for DSP based products increases dynamics of DSP application development. Besides the quality, achieving short TTM (Time To Market) becomes one of the main goals for a...
Provided by TELFOR
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Whitepapers
System for Management, Visualization and Maintenance of Infrastructural Resources
November 25, 2010, 12:00am PST
Telecommunication has emerged as the revolutionary technology responsible for connecting distanced places into one global connected world. For such purposes, complex infrastructural objects have...
Provided by TELFOR
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Whitepapers
Grid-Enabled Distributed Simulation - A State Machine Based Approach
November 25, 2010, 12:00am PST
The authors introduce in this paper a new approach for grid-enabled distributed frameworks designed for distributed simulation and computational steering, which can easily be used for general...
Provided by TELFOR
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Whitepapers
Design and Implementation of a Wireless Grid Based OnWSRF.NET
November 25, 2010, 12:00am PST
The use of grid computing has been successfully applied in many areas of computationally intensive applications including scientific research, bioinformatics, weather prediction and other topics....
Provided by TELFOR
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Whitepapers
A New Self Similar Traffic Generator (SSTG)
November 25, 2010, 12:00am PST
Internet traffic is a dominant traffic in the existing communication networks. Internet traffic has more complexity relative to voice traffic. However, they have an important role in the new...
Provided by TELFOR
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Whitepapers
Cross-Layer Analysis of Mobility Impact on TCP Protocols in IEEE 802.11 Wireless Networks
November 26, 2009, 12:00am PST
In this paper, the authors provide cross-layer analysis of the impact of mobility and medium access control parameters in IEEE 802.11 wireless network on variety TCP versions. Performances of the...
Provided by TELFOR
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Whitepapers
Software Controlled Digital FM Modulator for 100 Standard Stations
November 26, 2009, 12:00am PST
Imposing the Digital Signal Processing (DSP) theory into the new market available electronic components it is possible to produce custom-designed systems on a Field Programmable Gate Array (FPGA)...
Provided by TELFOR
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Whitepapers
A Survey of the Correlation Properties of the Generalized Barker Codes
November 26, 2009, 12:00am PST
The Barker codes (signals) were invented in the beginning of the 1950s of the twentieth century. Due to their positive auto-correlation properties the classical Barker signals have been applied in...
Provided by TELFOR
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Whitepapers
An Improved Method for Synthesis of Families of Costas Arrays
November 26, 2009, 12:00am PST
The present wireless communications must meet very strong conditions concerning the rate of data transmission, quality of service and electromagnetic compatibility. These requirements can be...
Provided by TELFOR
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Whitepapers
Cooperative Diversity in HSDPA Network
November 26, 2009, 12:00am PST
HSDPA (High Speed Data Packet Access) allows high-speed downlink data flow in WCDMA network. It uses all remaining power after power for DCH (Dedicated CHannels which are power controlled)...
Provided by TELFOR
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Whitepapers
Resource Allocation for Cognitive Relaying Network
November 26, 2009, 12:00am PST
In this paper, the problem of wireless resource allocation in OFDMA-based cognitive relaying network is investigated. The objective is maximizing the throughput of primary users in a system in...
Provided by TELFOR
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Whitepapers
Proposed Number of Services to Coexist in the Cable Bundle With VDSL2 Service
November 26, 2009, 12:00am PST
The authors propose a suitable number of different services to coexist in the same cable bundle with VDSL2 service (Very high bit-rate Digital Subscriber Line 2). The situation for quad cables and...
Provided by TELFOR
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Whitepapers
From Physical Mobile Channel to FIR Channel With Stationary, Ergodic Coefficients
November 26, 2009, 12:00am PST
The authors develop a discrete time Finite Impulse Response (FIR) channel model of a wireless mobile channel. They start with a physical ray model with a number of distinct scatterer clusters....
Provided by TELFOR
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Whitepapers
A New Coding Technique for the Transmission of UWB TH-PPM Signals
November 26, 2009, 12:00am PST
The Ultra Wide Band (UWB) systems were investigated from 1980 and regulated by FCC in USA from 2002 as short range data communication systems on a radio interface placed between 3.1 and 10.6 GHz....
Provided by TELFOR
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Whitepapers
Performance Evaluation of STBC MIMO Systems With Linear Precoding
November 26, 2009, 12:00am PST
Conventional SISO (Single Input Single Output) systems are limited by the multipath propagation and interference, so they cannot satisfy the demand for high data rates and better quality systems....
Provided by TELFOR
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Whitepapers
Video Transmission on Slowly Fading Channels Using Diversity
November 26, 2009, 12:00am PST
In slowly fading channels, video frame transmission time is usually longer than channel coherence time, so that fading channel can be represented as a set of parallel channels providing...
Provided by TELFOR
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Whitepapers
An Approach on Software Interface Selection
November 26, 2009, 12:00am PST
The aim of this paper is to show one way of the most convenient software interfaces selection for the implementation of special sampled distributed applications. The different types of software...
Provided by TELFOR
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Whitepapers
Coverage Problem for Sensor Networks: An Overview of Solution Strategies
November 26, 2009, 12:00am PST
Sensor networks are networks consisted of tiny devices (motes or nodes) equipped with a set of sensors, a transceiver, a C and memory. The authors use large numbers of such devices to form a...
Provided by TELFOR
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Whitepapers
Effect of Hidden Nodes in IEEE 802.15.4/ZigBee Wireless Sensor Networks
November 26, 2009, 12:00am PST
Packet collision is a situation when two nodes simultaneously start transmission, and their packets will collide at recipient node which wouldn't be able to successfully receive any of these...
Provided by TELFOR
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Whitepapers
Server Virtualization for Energy Efficient Data Centers in Bosnia and Herzegovina
November 26, 2009, 12:00am PST
This paper intends to raise awareness about possibilities of energy and cost savings in data centers. Situation in Bosnia and Herzegovina is analyzed through results of the survey from the IT...
Provided by TELFOR
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Whitepapers
Bandwidth as a Dominant Metric in Localized QoS Algorithm
November 26, 2009, 12:00am PST
Most of the QoS routing mechanisms involve periodic exchange of global state information which causes communication overheads. Therefore, localized routing is the method to avoid this problem. The...
Provided by TELFOR
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Whitepapers
OFDM Baseband Transmitter Implementation Compliant IEEE Std 802.16d on FPGA
November 26, 2009, 12:00am PST
Broadband Wireless Access (BWA) is a promising technology which can offer high speed voice, video and internet connection. The leading candidate for BWA is WiMAX, a technology that complies with...
Provided by TELFOR
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Whitepapers
Cross-Layer Analysis of Mobility Impact on TCP Protocols in IEEE 802.11 Wireless Networks
November 26, 2009, 12:00am PST
In this paper, the authors provide cross-layer analysis of the impact of mobility and medium access control parameters in IEEE 802.11 wireless network on variety TCP versions. Performances of the...
Provided by TELFOR
-
Whitepapers
A New Self Similar Traffic Generator (SSTG)
November 25, 2010, 12:00am PST
Internet traffic is a dominant traffic in the existing communication networks. Internet traffic has more complexity relative to voice traffic. However, they have an important role in the new...
Provided by TELFOR
-
Whitepapers
Design and Implementation of a Wireless Grid Based OnWSRF.NET
November 25, 2010, 12:00am PST
The use of grid computing has been successfully applied in many areas of computationally intensive applications including scientific research, bioinformatics, weather prediction and other topics....
Provided by TELFOR
-
Whitepapers
Grid-Enabled Distributed Simulation - A State Machine Based Approach
November 25, 2010, 12:00am PST
The authors introduce in this paper a new approach for grid-enabled distributed frameworks designed for distributed simulation and computational steering, which can easily be used for general...
Provided by TELFOR
-
Whitepapers
System for Management, Visualization and Maintenance of Infrastructural Resources
November 25, 2010, 12:00am PST
Telecommunication has emerged as the revolutionary technology responsible for connecting distanced places into one global connected world. For such purposes, complex infrastructural objects have...
Provided by TELFOR
-
Whitepapers
Implementation of a Universal Framework for Deployment, Debugging and Control of Applications on DSP Targets
November 25, 2010, 12:00am PST
Continuously growing demand for DSP based products increases dynamics of DSP application development. Besides the quality, achieving short TTM (Time To Market) becomes one of the main goals for a...
Provided by TELFOR
-
Whitepapers
An Example of Secure Java Based Mobile Application
November 25, 2010, 12:00am PST
In this paper, a design and implementation of a JAVA application on mobile phones that securely connect to Web services is described. The authors considered a Web service scenario where mobile...
Provided by TELFOR
-
Whitepapers
Zigbee Home Light Controller Implementation and Verification on Digital TV Receiver
November 25, 2010, 12:00am PST
Lighting control presents a small part of home automation control systems. The main goal of home automation systems is to enable home devices to communicate with each other and to do some actions...
Provided by TELFOR
-
Whitepapers
Development of Secure LZW Technique for Secret Compressed Data Transmission
November 25, 2010, 12:00am PST
Compression algorithms reduce the redundancy in data representation to decrease the storage required for that data. Data compression offers an attractive approach to reducing communication costs...
Provided by TELFOR
-
Whitepapers
Modelling Software-Intensive Ingest System: Behavioural Description and Domain Model
November 25, 2010, 12:00am PST
The new model of television production is based upon: digital formats, the centralized management of media content and associated metadata, non-linear assembly of media elements, high-speed...
Provided by TELFOR
-
Whitepapers
Improved Multiuser Wireless Video Streaming by Considering Influence on a Subsequent Frame
November 25, 2010, 12:00am PST
This paper gives contribution to improvement of h.264 downlink multiuser video streaming over wireless channels. The improvement is achieved by including the influence of packet loss on the...
Provided by TELFOR
-
Whitepapers
Measurement of the Microwave Permittivity of Polymer Materials for High-Speed Optical Modulator Design
November 25, 2010, 12:00am PST
Metropolitan access communications systems are currently looking on high data rate capabilities. Moreover, optical networks are and will be undoubtedly used. Depending on requested data rates and...
Provided by TELFOR
-
Whitepapers
Tunable UDWDM Transmitter With Optical Comb Source
November 25, 2010, 12:00am PST
In fiber optical communications, high capacity transmission is one of the main challenges. Wavelength Division Multiplexing (WDM) is a key technology for effective utilization of fiber bandwidth...
Provided by TELFOR
-
Whitepapers
Scheduling in Optical Packet Rings
November 25, 2010, 12:00am PST
In the metropolitan area, traditional SONET/SDH circuit switched rings are likely to be replaced with optical packet/burst switching technologies. In this paper, the authors consider a slotted WDM...
Provided by TELFOR
-
Whitepapers
Distributed Sensor Networks: An Approach
November 25, 2010, 12:00am PST
During last years, several activities have taken place in order to monitor environmental changes with the aim of supporting the ordinary activities in the territory administration. This has...
Provided by TELFOR
-
Whitepapers
A Solution for Radio Data Transmission Problem in Electrical Substation Remote Control
November 25, 2010, 12:00am PST
In SCADA systems many different protocols for data transmission between a control center and electrical substations are used. (IEC101, DNP3, ADLP-80, ADLP-180, MODBUS). Generally, there is no rule...
Provided by TELFOR
-
Whitepapers
Near-Optimal Joint Routing and Power Allocation for Amplify-and-Forward Multi-Hop Networks
November 25, 2010, 12:00am PST
In this paper, the authors developed a sub-optimal algorithm for joint routing and power allocation for an amplify-and-forward multi-hop relay network. The objective function for the optimization...
Provided by TELFOR
-
Whitepapers
Optimal Joint Routing and Power Allocation for Decode-and-Forward Multi-Hop Networks
November 25, 2010, 12:00am PST
A novel cross-layer routing protocol is presented for Decode-and-Forward multi-hop relaying systems which lead to optimal power allocation for a given power budget by maximizing the capacity of...
Provided by TELFOR
-
Whitepapers
Parameters Optimization of a Newly Proposed DQPSK Receiver
November 25, 2010, 12:00am PST
Modern mobile links are characterized by frequency selectivity due to multipath propagation, as well as time selectivity arising from relative transmitter-receiver motion, oscillator drifts, or...
Provided by TELFOR
-
Whitepapers
Moments of the Signal After Micro-And Macrodiversity Processing in Gamma Shadowed Nakagami-M Fading Channels
November 25, 2010, 12:00am PST
This paper studies wireless communication system with micro- and macro-diversity reception in gamma shadowed Nakagami-m fading channels. N-branch Maximal-Ratio Combining (MRC) is implemented at...
Provided by TELFOR
-
Whitepapers
Performances of the OFDM/QPSK System With MBDD in the Presence of Frequency Offset
November 25, 2010, 12:00am PST
In this paper, the authors present the basic characteristics of Orthogonal Frequency Division Multiplex (OFDM) systems with Quadrature Phase Shift Keying (QPSK) modulation and Multi-Bit...
Provided by TELFOR
-
Whitepapers
Single-Hop Vs. Multi-Hop - Energy Efficiency Analysis in Wireless Sensor Networks
November 25, 2010, 12:00am PST
Wireless sensor networks are networks of devices with restrained resources, used for environmental, military, automation and home applications. Radio transceiver is one of the biggest power...
Provided by TELFOR
-
Whitepapers
An Indoor Positioning System Based on a WiFi Router and FM Beacons
November 25, 2010, 12:00am PST
The location of a mobile user has become an important requirement for modern applications in the area of ubiquitous computing. The Global Positioning System (GPS) is still the leading technology...
Provided by TELFOR
-
Whitepapers
MAC Protocol Requirements for WLAN's With Beamforming
November 25, 2010, 12:00am PST
Beamforming is a method of intensifying Radio Frequency (RF) energy at desired places, such as the receiver position, in order to improve the Signal-to-Noise Ratio (SNR) there. Beamforming may...
Provided by TELFOR
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