TELFOR

Displaying 1-40 of 56 results

  • White Papers // Nov 2010

    Implementation of a Universal Framework for Deployment, Debugging and Control of Applications on DSP Targets

    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 company producing such a product. For a DSP chip producer, this means that offering a high quality System Development Kit...

    Provided By TELFOR

  • White Papers // Nov 2010

    System for Management, Visualization and Maintenance of Infrastructural Resources

    Telecommunication has emerged as the revolutionary technology responsible for connecting distanced places into one global connected world. For such purposes, complex infrastructural objects have been built and connected in some manner including cable television networks, ISP networks, telephone networks, etc. The main characteristic of such infrastructures is the network topology,...

    Provided By TELFOR

  • White Papers // Nov 2010

    Grid-Enabled Distributed Simulation - A State Machine Based Approach

    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 purpose processing. Previous research focused on the development of a set of frameworks and platforms for distributed simulation and computational steering. Most of...

    Provided By TELFOR

  • White Papers // Nov 2010

    Design and Implementation of a Wireless Grid Based OnWSRF.NET

    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. Rapidly growing wireless devices such as cellular phones, PDA, notebooks, tablet PCs, handheld devices force one to prepare new applications based on globally prepared standards...

    Provided By TELFOR

  • White Papers // Nov 2010

    A New Self Similar Traffic Generator (SSTG)

    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 networks. Thus software developers have produced many kinds of Internet traffic software. The existing Internet traffic software are divided into three...

    Provided By TELFOR

  • White Papers // Nov 2010

    LocBiometrics: Mobile Phone Based Multifactor Biometric Authentication With Time and Location Assurance

    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 the authentication process prone to identity theft and false impersonation. Biometric authentication offers personal identification but is missing the real-time and precise-position...

    Provided By TELFOR

  • White Papers // Nov 2010

    Fuzzy CAC Adaptation for Effective Traffic Control in GMPLS Networks

    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 algorithm is used to provide stable link utilization and achieve preferable rate of rejected LSP connections, while maintaining selective...

    Provided By TELFOR

  • White Papers // Nov 2010

    Reliable and Reconfigurable Wi-Fi Monitoring Network Based on Software Agents

    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 two tasks: it senses its surrounding environment through sensors and performs actions in it with the help...

    Provided By TELFOR

  • White Papers // Nov 2010

    A Fuzzy Logic-Based Energy Efficient Scheme for Real-Time Packet Transmission InWSN

    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 transmission in real-time environment is vital. In this paper, a Fuzzy Logic System (FLS) is used as a decision mechanism for next...

    Provided By TELFOR

  • White Papers // Nov 2010

    Characteristics and Measurements of Optical Fibers

    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 the metro segment for connection of business customers. In the last decade implementation of the optical fibers is more and more evident in...

    Provided By TELFOR

  • White Papers // Nov 2010

    Performance Evaluation of Frequency Reuse Schemes in LTE Based Network

    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 context and where a frequency reuse of 1 is proposed, i.e., all cells/sectors of the network operate...

    Provided By TELFOR

  • White Papers // Nov 2010

    Priority Handover Schemes in Wireless Mobile Networks

    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 the process of changing the channel (frequency, time slot, spreading code, or their combination of them) associated with the current...

    Provided By TELFOR

  • White Papers // Nov 2010

    Open Loop Sensor Based System Used for Mitigation of Cross-Tier Interference in Femtocell Networks

    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 interference generated by the femtocell to the macrocell user. A mixed indoor-outdoor environment is analyzed and the corresponding problems...

    Provided By TELFOR

  • White Papers // Nov 2010

    Power and Spectral Efficiency Advantages of OFDM/OQAM Over OFDM/QAM for PHY in Wireless and Cognitive Radio Networks

    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 (CR) applications. The emphasis is on the ability of the OFDM/OQAM format to work without Cyclic-Prefix (CP), and to have a relatively...

    Provided By TELFOR

  • White Papers // Nov 2010

    Performance Comparison of OFDMA and CDMA Access Technologies in Broadband Wireless Communication Networks

    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 and CDMA as access technologies and their expected performance as well as the real measured performance and bandwidth efficiency. Furthermore...

    Provided By TELFOR

  • White Papers // Nov 2010

    A Solution for Radio Data Transmission Problem in Electrical Substation Remote Control

    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 to what is used as a medium for data transmission, and usually some of available resources such as copper wires are used,...

    Provided By TELFOR

  • White Papers // Nov 2010

    Distributed Sensor Networks: An Approach

    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 brought the deployment of several sensing systems each one with own features and peculiarities. The emerging of global computing is changing the...

    Provided By TELFOR

  • White Papers // Nov 2010

    Scheduling in Optical Packet Rings

    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 optical packet ring operating without resource reservation mechanisms. In such rings, optical packets in transit have priority over traffic to be inserted...

    Provided By TELFOR

  • White Papers // Nov 2010

    Tunable UDWDM Transmitter With Optical Comb Source

    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 and it is used in the realization of all optical multi-access networks. Two approaches are observed in the development of WDM systems: one...

    Provided By TELFOR

  • White Papers // Nov 2010

    Measurement of the Microwave Permittivity of Polymer Materials for High-Speed Optical Modulator Design

    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 data modulation schemes that will be used, high speed optical modulation devices are required for the core access network. Direct modulation of laser...

    Provided By TELFOR

  • White Papers // Nov 2010

    Improved Multiuser Wireless Video Streaming by Considering Influence on a Subsequent Frame

    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 subsequent frame in a real time distortion estimation system, during the packet ordering procedure. In order to take into account the probability...

    Provided By TELFOR

  • White Papers // Nov 2010

    Modelling Software-Intensive Ingest System: Behavioural Description and Domain Model

    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 networks, format agnostic distribution and automated processes. An effective software-intensive production system should allow incoming material to be available to all users on the...

    Provided By TELFOR

  • White Papers // Nov 2010

    Development of Secure LZW Technique for Secret Compressed Data Transmission

    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 by using available bandwidth effectively. Over the last decade there has been an unprecedented explosion in the amount of digital data transmitted via the...

    Provided By TELFOR

  • White Papers // Nov 2010

    Zigbee Home Light Controller Implementation and Verification on Digital TV Receiver

    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 which are set by users. To make a home autonomous, it is necessary to obtain, mount and...

    Provided By TELFOR

  • White Papers // Nov 2010

    An Example of Secure Java Based Mobile Application

    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 phone user produces a cryptographic signature in the JAVA application using the PKI SIM smart card. Data is encrypted...

    Provided By TELFOR

  • White Papers // Nov 2010

    Spreading Sequence Adaptation for Dynamic MC-CDMA Systems

    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 accomplish these demands is MC-CDMA. In this paper, the authors consider the uplink scenario of a single cell Multi-Carrier Code Division...

    Provided By TELFOR

  • White Papers // Nov 2010

    Capacity Bounds and Achievable Rates of the Gaussian Relay Channel

    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 capacity bounds and achievable rates of the Gaussian relay channel. To evaluate achievable rates they consider two cooperative strategies: Decode and Forward (DF)...

    Provided By TELFOR

  • White Papers // Nov 2010

    MAC Protocol Requirements for WLAN's With Beamforming

    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 increase system capacity and performance, suppress interference and noise, improve signal quality, and it may save power. Beamforming techniques have been...

    Provided By TELFOR

  • White Papers // Nov 2010

    An Indoor Positioning System Based on a WiFi Router and FM Beacons

    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 for outdoor navigation, but the situation is not as clear-cut when it comes to indoor positioning. There are a number...

    Provided By TELFOR

  • White Papers // Nov 2010

    Single-Hop Vs. Multi-Hop - Energy Efficiency Analysis in Wireless Sensor Networks

    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 consumer in sensor node, so it's usage need to be very efficient in order to maximize node's operational life. Node can route it's messages...

    Provided By TELFOR

  • White Papers // Nov 2010

    Performances of the OFDM/QPSK System With MBDD in the Presence of Frequency Offset

    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 Differential Detection (MBDD). In the simulation environment designed for this purpose, they analyze the effects of frequency offset on the performances of OFDM digital communications....

    Provided By TELFOR

  • White Papers // Nov 2010

    Moments of the Signal After Micro-And Macrodiversity Processing in Gamma Shadowed Nakagami-M Fading Channels

    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 the micro level (single base station) and Selection Combining (SC) with two base stations (dual diversity) is implemented at the macro level. Expression for the moments,...

    Provided By TELFOR

  • White Papers // Nov 2010

    Parameters Optimization of a Newly Proposed DQPSK Receiver

    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 phase noise. When channel state information is not available at the receiver, differential schemes can obviate channel estimation and may collect diversity at the price...

    Provided By TELFOR

  • White Papers // Nov 2010

    Optimal Joint Routing and Power Allocation for Decode-and-Forward Multi-Hop Networks

    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 source to destination. The problem of rate maximization by jointly allocating power and selecting relays nodes with limited total power constraint of...

    Provided By TELFOR

  • White Papers // Nov 2010

    Near-Optimal Joint Routing and Power Allocation for Amplify-and-Forward Multi-Hop Networks

    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 is the received Signal-to-Noise Ratio (SNR) at the destination. Higher SNR would cause for lower bit error rate consequently. The joint problem of...

    Provided By TELFOR

  • White Papers // Nov 2010

    QoE Dimensions and QoE Measurement of NGN Services

    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 expectations is a great challenge. Therefore, the following aspects of QoE (Quality of Experience) should be taken into the consideration: technical parameters, usability, subjective evaluation,...

    Provided By TELFOR

  • White Papers // Nov 2010

    EGPRS - Based Design Solution for Tariff Transparency Issue in Mobile Number Portability

    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 provider to other service provider without changing their mobile numbers. However, beside being successful implementation, mobile number portability has caused the loss...

    Provided By TELFOR

  • White Papers // Nov 2010

    Multidimensional and Adaptive Non-Intrusive Anomaly Detection in Network Services

    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 with distributed services where many different performance indicators might influence the overall performance of the combined system. The authors propose the analysis of signal-based metrics...

    Provided By TELFOR

  • White Papers // Nov 2010

    Advanced Routing Concept Performance Analysis

    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 several concepts in a complete routing system. First, a modification to the widely used routing process is proposed, such that a complete list of all...

    Provided By TELFOR

  • White Papers // Nov 2009

    Cross-Layer Analysis of Mobility Impact on TCP Protocols in IEEE 802.11 Wireless Networks

    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 Internet transport protocols may significantly degrade when end to end connection includes wireless links where packets delays and losses are...

    Provided By TELFOR

  • White Papers // Nov 2010

    Implementation of a Universal Framework for Deployment, Debugging and Control of Applications on DSP Targets

    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 company producing such a product. For a DSP chip producer, this means that offering a high quality System Development Kit...

    Provided By TELFOR

  • White Papers // Nov 2010

    System for Management, Visualization and Maintenance of Infrastructural Resources

    Telecommunication has emerged as the revolutionary technology responsible for connecting distanced places into one global connected world. For such purposes, complex infrastructural objects have been built and connected in some manner including cable television networks, ISP networks, telephone networks, etc. The main characteristic of such infrastructures is the network topology,...

    Provided By TELFOR

  • White Papers // Nov 2010

    Grid-Enabled Distributed Simulation - A State Machine Based Approach

    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 purpose processing. Previous research focused on the development of a set of frameworks and platforms for distributed simulation and computational steering. Most of...

    Provided By TELFOR

  • White Papers // Nov 2010

    Design and Implementation of a Wireless Grid Based OnWSRF.NET

    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. Rapidly growing wireless devices such as cellular phones, PDA, notebooks, tablet PCs, handheld devices force one to prepare new applications based on globally prepared standards...

    Provided By TELFOR

  • White Papers // Nov 2010

    A New Self Similar Traffic Generator (SSTG)

    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 networks. Thus software developers have produced many kinds of Internet traffic software. The existing Internet traffic software are divided into three...

    Provided By TELFOR

  • White Papers // Nov 2009

    Cross-Layer Analysis of Mobility Impact on TCP Protocols in IEEE 802.11 Wireless Networks

    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 Internet transport protocols may significantly degrade when end to end connection includes wireless links where packets delays and losses are...

    Provided By TELFOR

  • White Papers // Nov 2009

    OFDM Baseband Transmitter Implementation Compliant IEEE Std 802.16d on FPGA

    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 the IEEE 802.16 family of standards. This paper is focused towards the hardware Implementation of Wireless MAN-OFDM Physical Layer of...

    Provided By TELFOR

  • White Papers // Nov 2009

    Bandwidth as a Dominant Metric in Localized QoS Algorithm

    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 network in this technique is inferred by the source nodes using statistics which are collected locally. This paper presents new localized algorithm...

    Provided By TELFOR

  • White Papers // Nov 2009

    Server Virtualization for Energy Efficient Data Centers in Bosnia and Herzegovina

    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 area. There is a hypothetical estimation of cost saving of USD 500,000 for period of three years, for 500...

    Provided By TELFOR

  • White Papers // Nov 2009

    Effect of Hidden Nodes in IEEE 802.15.4/ZigBee Wireless Sensor Networks

    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 packets. Packets will need to be retransmitted again which would cause unnecessary energy waste. It will be also increased packet delivery...

    Provided By TELFOR

  • White Papers // Nov 2009

    Coverage Problem for Sensor Networks: An Overview of Solution Strategies

    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 network, usually deployed over a large area. Motes collaborate to perform a larger sensing task, in...

    Provided By TELFOR

  • White Papers // Nov 2009

    An Approach on Software Interface Selection

    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 interfaces were described (functional profiles and middleware) as well as the attributes of computer networks that influence on target software...

    Provided By TELFOR

  • White Papers // Nov 2009

    Video Transmission on Slowly Fading Channels Using Diversity

    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 transmission diversity. Using simulation, the authors evaluate bounds on the quality of the received video, obtained by utilizing the available channel...

    Provided By TELFOR

  • White Papers // Nov 2009

    Performance Evaluation of STBC MIMO Systems With Linear Precoding

    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. The benefits of MIMO (Multiple Input Multiple Output) techniques are well established: linear growth in transmission rate with the minimum number...

    Provided By TELFOR

  • White Papers // Nov 2009

    A New Coding Technique for the Transmission of UWB TH-PPM Signals

    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. The large bandwidth at high frequencies ensures high data rates and easy separation of direct component...

    Provided By TELFOR

  • White Papers // Nov 2009

    From Physical Mobile Channel to FIR Channel With Stationary, Ergodic Coefficients

    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. They assume that the positions of scatterer clusters are fixed, but the contribution of each cluster is a sum...

    Provided By TELFOR

  • White Papers // Nov 2009

    Proposed Number of Services to Coexist in the Cable Bundle With VDSL2 Service

    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 twisted pairs is considered for real-case and bad-case assumptions. NEXT (Near-End CRosstalk), FEXT (Far-End CRosstalk), and background AWGN...

    Provided By TELFOR

  • White Papers // Nov 2009

    Resource Allocation for Cognitive Relaying Network

    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 which cognitive users act as a relay for primary users. In the authors' proposed scheme, while primary users achieved desire rate,...

    Provided By TELFOR

  • White Papers // Nov 2009

    Cooperative Diversity in HSDPA Network

    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) Channels and other channels (CPICH (PIlot CHannel), SCH (Synchronization CHannel), PCH (paging channel) is reserved on Node-B since HSDPA channel is...

    Provided By TELFOR

  • White Papers // Nov 2009

    An Improved Method for Synthesis of Families of Costas Arrays

    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 satisfy only by exploitation of families of complex radio signals, possessing special correlation properties. With regard, a method for synthesis of families of a class...

    Provided By TELFOR

  • White Papers // Nov 2010

    LocBiometrics: Mobile Phone Based Multifactor Biometric Authentication With Time and Location Assurance

    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 the authentication process prone to identity theft and false impersonation. Biometric authentication offers personal identification but is missing the real-time and precise-position...

    Provided By TELFOR

  • White Papers // Nov 2010

    Fuzzy CAC Adaptation for Effective Traffic Control in GMPLS Networks

    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 algorithm is used to provide stable link utilization and achieve preferable rate of rejected LSP connections, while maintaining selective...

    Provided By TELFOR

  • White Papers // Nov 2010

    Reliable and Reconfigurable Wi-Fi Monitoring Network Based on Software Agents

    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 two tasks: it senses its surrounding environment through sensors and performs actions in it with the help...

    Provided By TELFOR

  • White Papers // Nov 2010

    A Fuzzy Logic-Based Energy Efficient Scheme for Real-Time Packet Transmission InWSN

    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 transmission in real-time environment is vital. In this paper, a Fuzzy Logic System (FLS) is used as a decision mechanism for next...

    Provided By TELFOR

  • White Papers // Nov 2010

    Characteristics and Measurements of Optical Fibers

    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 the metro segment for connection of business customers. In the last decade implementation of the optical fibers is more and more evident in...

    Provided By TELFOR

  • White Papers // Nov 2010

    Performance Evaluation of Frequency Reuse Schemes in LTE Based Network

    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 context and where a frequency reuse of 1 is proposed, i.e., all cells/sectors of the network operate...

    Provided By TELFOR

  • White Papers // Nov 2010

    Priority Handover Schemes in Wireless Mobile Networks

    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 the process of changing the channel (frequency, time slot, spreading code, or their combination of them) associated with the current...

    Provided By TELFOR

  • White Papers // Nov 2010

    Open Loop Sensor Based System Used for Mitigation of Cross-Tier Interference in Femtocell Networks

    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 interference generated by the femtocell to the macrocell user. A mixed indoor-outdoor environment is analyzed and the corresponding problems...

    Provided By TELFOR

  • White Papers // Nov 2010

    Power and Spectral Efficiency Advantages of OFDM/OQAM Over OFDM/QAM for PHY in Wireless and Cognitive Radio Networks

    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 (CR) applications. The emphasis is on the ability of the OFDM/OQAM format to work without Cyclic-Prefix (CP), and to have a relatively...

    Provided By TELFOR

  • White Papers // Nov 2010

    Performance Comparison of OFDMA and CDMA Access Technologies in Broadband Wireless Communication Networks

    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 and CDMA as access technologies and their expected performance as well as the real measured performance and bandwidth efficiency. Furthermore...

    Provided By TELFOR

  • White Papers // Nov 2010

    A Solution for Radio Data Transmission Problem in Electrical Substation Remote Control

    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 to what is used as a medium for data transmission, and usually some of available resources such as copper wires are used,...

    Provided By TELFOR

  • White Papers // Nov 2010

    Distributed Sensor Networks: An Approach

    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 brought the deployment of several sensing systems each one with own features and peculiarities. The emerging of global computing is changing the...

    Provided By TELFOR

  • White Papers // Nov 2010

    Scheduling in Optical Packet Rings

    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 optical packet ring operating without resource reservation mechanisms. In such rings, optical packets in transit have priority over traffic to be inserted...

    Provided By TELFOR

  • White Papers // Nov 2010

    Tunable UDWDM Transmitter With Optical Comb Source

    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 and it is used in the realization of all optical multi-access networks. Two approaches are observed in the development of WDM systems: one...

    Provided By TELFOR

  • White Papers // Nov 2010

    Measurement of the Microwave Permittivity of Polymer Materials for High-Speed Optical Modulator Design

    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 data modulation schemes that will be used, high speed optical modulation devices are required for the core access network. Direct modulation of laser...

    Provided By TELFOR

  • White Papers // Nov 2010

    Improved Multiuser Wireless Video Streaming by Considering Influence on a Subsequent Frame

    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 subsequent frame in a real time distortion estimation system, during the packet ordering procedure. In order to take into account the probability...

    Provided By TELFOR

  • White Papers // Nov 2010

    Modelling Software-Intensive Ingest System: Behavioural Description and Domain Model

    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 networks, format agnostic distribution and automated processes. An effective software-intensive production system should allow incoming material to be available to all users on the...

    Provided By TELFOR

  • White Papers // Nov 2010

    Development of Secure LZW Technique for Secret Compressed Data Transmission

    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 by using available bandwidth effectively. Over the last decade there has been an unprecedented explosion in the amount of digital data transmitted via the...

    Provided By TELFOR

  • White Papers // Nov 2010

    Zigbee Home Light Controller Implementation and Verification on Digital TV Receiver

    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 which are set by users. To make a home autonomous, it is necessary to obtain, mount and...

    Provided By TELFOR

  • White Papers // Nov 2010

    An Example of Secure Java Based Mobile Application

    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 phone user produces a cryptographic signature in the JAVA application using the PKI SIM smart card. Data is encrypted...

    Provided By TELFOR