University of Erlangen-Nuremberg

Displaying 1-28 of 28 results

  • White Papers // Feb 2012

    A Multi-Channel IEEE 1609.4 and 802.11p EDCA Model for the Veins Framework

    Increasing the realism and thereby the explanatory power of Inter-Vehicle Communication (IVC) simulation is an ongoing research topic in the Car-2-X community. The authors contribute to this trend by extending the well-established Veins Framework for the OMNeT++ simulator by a multi-channel simulation model for IEEE 1609.4/802.11p enabling simulative studies to...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2011

    SlotSwap: Strong and Affordable Location Privacy in Intelligent Transportation Systems

    Public acceptance, and thus the economic success of an Intelligent Transportation System (ITS), is highly dependent on the quality of deployed privacy mechanisms. In general, neither users nor operators should be able to track a given individual. One approach to facilitate this is the usage of pseudonym pools, which allow...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Jun 2011

    Potential Effects Of The World Economic Crisis On The MENA's Foreign Trade And Regional Economic Integration

    According to the annual Review of Development in Globalization and Regional Integration in the Arab Countries prepared by ESAW in 2008, the current international financial crisis will increase regional economic Integration between MENA countries at the expense of their integration in the world economy. Due to the decreasing global financial...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Apr 2011

    A Decision Support Scheme for Software Process Improvement Prioritization

    Software managers pursuing process improvement initiatives are confronted with the problem of selecting potential improvements. In the field of software quality assurance, suitable decision support for prioritizing the optimization of activities according to their return on investment is not yet available. The authors' paper addresses this research gap. They develop...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Nov 2010

    Mode Switch - Adaptive Use of Delay-Sensitive Or Energy-Aware Communication in IEEE 802.15.4-Based Networks

    The authors propose "Mode switch", an adaptive load-sensitive solution that supports both an energy-efficient operation mode for transmitting normal sensor data and an QoS-aware low-latency mode for high priority emergency messages. Typically, sensor networks are considered to operate efficiently w.r.t. energy consumption. A good example is the IEEE 802.15.4 protocol,...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Oct 2010

    Conformance Quality and Failure Costs in the Software Industry: An Empirical Analysis of Open Source Software

    The quality cost concept is well known in production economics. Recently, it has received a lot of attention in the field of software engineering. However, empirical studies of the association between failure costs and conformance quality have only been conducted for closed source software projects, but not for open source...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2010

    Path Heuristics Using ACO for Inter-Domain Routing in Mobile Ad Hoc and Sensor Networks

    The authors investigate the use of biologically inspired routing heuristics in the field of inter-domain routing in sensor networks. Instead of relying on classical topology control techniques for routing in sensor networks, the use of geographical coordinates has been investigated for self-organized and fully distributed message forwarding. However, the identification...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2010

    Dynamic Operator Replacement in Sensor Networks

    The authors present an integrated approach for supporting in-network sensor data processing in dynamic and heterogeneous sensor networks. The concept relies on data stream processing techniques that define and optimize the distribution of queries and their operators. They anticipate a high degree of dynamics in the network, which can for...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Apr 2010

    Stateful Mobile Modules for Sensor Networks

    Most sensor network applications are dominated by the acquisition of sensor values. Due to energy limitations and high energy costs of communication, in-network processing has been proposed as a means to reduce data transfers. As application demands may change over time and nodes run low on energy, get overloaded, or...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Mar 2010

    On the Feasibility of UMTS-Based Traffic Information Systems

    Intelligent Transportation Systems (ITS) are a hot topic in the communications society. Currently, research is primarily focusing on setting up Vehicular Ad Hoc NETworks (VANETs) based on WLAN technology. However, VANETs are heavily dependent on high market penetration or infrastructure support. Third-Generation (3G) networks might complement these efforts. They are...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Mar 2010

    Validating UML Simulation Models With Model-Level Unit Tests

    The paper describes model-level unit tests for model-driven simulation based on UML models. The paper refers to the well-known unit testing method and applies this concept on a higher abstraction level, that is on UML simulation models. The concept of model-based simulation has become more and more popular throughout the...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Mar 2010

    Stateful Mobile Modules for Robust In-Network Processing

    Most sensor-network applications are dominated by the acquisition of sensor values. Due to energy limitations and high energy costs of communication, in-network processing has been proposed as a means to reduce data transfers. As application demands may change over time and nodes run low on energy, get overloaded, or simply...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2010

    On the Convergence of Iterative Receiver Algorithms Utilizing Hard Decisions

    The convergence of receivers performing Iterative Hard Decision Interference Cancellation (IHDIC) is analyzed in a general framework for ASK, PSK, and QAM constellations. The authors first give an overview of IHDIC algorithms known from the literature applied to linear modulation and DS-CDMA-based transmission systems and show the relation to Hopfield...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2010

    Beamforming for SC-FDMA Transmission Over MIMO ISI Channels With Decision-Feedback Equalization

    The authors consider transmit beamforming algorithms for Single - Carrier Frequency - Division Multiple Access (SC - FDMA) transmission over frequency - selective Multiple - Input Multiple - Output (MIMO) channels. The beamforming filters are designed for optimum performance of MIMO Minimum Mean - Squared Error Decision - Feedback Equalization...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2009

    Self-Localization Capable Mobile Sensor Nodes

    Position sensing systems for indoor environments have one common problem: The setup effort of the whole system. GPS-supported localization is simple and fast to implement and the reference grid is ubiquitous. However, in locations where the signals of GPS are not available, e.g. indoor, or where the technique is not...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Aug 2009

    Robust MBSFN Transmission Using the Golden Code

    Multimedia Broadcast over a Single Frequency Network (MBSFN) has attracted a lot of interest recently. This paper is on Golden coded spatial multiplexing MBSFN transmission using a Soft-Output Sphere Decoder (SOSD) and the impact of such a transceiver on the BLock Error Rate (BLER) system performance. In total, the authors...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Jul 2009

    User Pairing for Multiuser SC-FDMA Transmission Over Virtual MIMO ISI Channels

    This paper proposes different criteria for user pairing for a Virtual Multiple-Input Multiple-Output (V-MIMO) Single-Carrier Frequency-Division Multiple Access (SC-FDMA) transmission over InterSymbol Interference (ISI) channels. Two users, equipped with a single antenna each, transmit their data in the same time slot and frequency band. The receiver at the Base Station...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Jun 2009

    Efficient Distribution of Large Files in UMTS Supported by Network Coded M2M Data Transfer With Multiple Generations

    This paper is a sequel of previous work, in which the authors have studied the traffic management problem in UMTS. The main objective was to improve the spectral efficiency of cellular networks by employing network coding supported direct mobile-to-mobile communication on usually underloaded uplink channels for the distribution of a...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Apr 2009

    QoS-Oriented Integrated Network Planning for Industrial Wireless Sensor Networks

    The authors present an approach for integrated network planning with QoS estimation in a simulation tool for use in industrial environments. The architecture is based on a wireless planning tool that uses measurements or accurate models of the environment to predict physical layer signal distribution. This tool allows the precise...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2009

    Design and Evaluation of a Multilevel Decoder for Satellite Communications

    In this paper, the authors propose a MultiLevel Coding (MLC) scheme suitable for satellite communications, where different QoS levels are required. They introduce a novel characterization of schemes based on mutual information, called Multi-Stage Decoder (MSD) charts, to aid in the design and evaluation of multilevel coding systems. This characterization...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2009

    An Energy Model for Simulation Studies of Wireless Sensor Networks Using OMNeT++

    Simulation is frequently used to evaluate the performance of networking algorithms and techniques in wireless communication networks. However, performance aspects such as the transmission delay, the channel utilization, or the throughput provide only limited information about the feasibility of the particular approach. This is especially the case when investigating Wireless...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2009

    Block Processing for One-Dimensional Adaptive Channel Estimation Algorithms for OFDM Systems

    Adaptive pilot-aided channel estimation in frequency domain for Orthogonal Frequency-Division Multiplexing (OFDM) transmission is considered in this paper. More specifically, adaptive block and non-block processing algorithms for the first one-dimensional filtering stage of a two-stage channel estimator are compared. The estimator consists of Two One-Dimensional filtering stages (2 ? 1D)...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Jan 2009

    Comparison of Receivers for SC-FDMA Transmission Over Frequency-Selective MIMO Channels

    In this paper the performance of different receivers for Single-Carrier Frequency Division Multiple Access (SC-FDMA) transmission over frequency-selective fading channels is investigated. The receiver design is done for a single-user Multiple-Input Multiple-Output (MIMO) system. Linear equalization in frequency domain according to the Minimum Mean-Squared Error (MMSE) criterion is compared to...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Oct 2008

    Improving IEEE 802.15.4 for Low-Latency Energy-Efficient Industrial Applications

    The IEEE 802.15.4 standard for LR-WPANs is becoming a de-facto standard for Wireless Sensor Networks (WSNs) applications in industrial fields. In this paper, the authors evaluate the latency performance of the IEEE 802.15.4 protocol based on a typical industrial scenario: a star network with 20 devices that send short messages...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2008

    A Study of Self-Organization Mechanisms in Ad Hoc and Sensor Networks

    Self-organization is a great concept for building scalable systems consisting of a huge number of subsystems. The primary objectives are improved scalability and dynamic adaptation to changing environmental conditions. Until now, many self-organization methods have been developed for communication networks in general and ad hoc networks in particular. Nevertheless, the...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2008

    Comparison of One-Dimensional Adaptive Channel Estimation Techniques for OFDM Systems

    In this paper, adaptive pilot-aided channel estimation for Orthogonal Frequency-Division Multiplexing (OFDM) transmission is addressed. For this purpose, instead of a theoretically optimum Two-Dimensional (2D) filter, two consecutive one-dimensional (2 ? 1D) filters are applied. In particular, three algorithms for the first 1D step are compared, namely Normalized Least-Mean-Squares (NLMS),...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2008

    Scalability in Analyzing the Availability of Large-Scale Networks Using Multicast

    The goal of this paper is to identify and discuss scalability issues for the measurement-based analysis of the availability in large-scale networks using IP multicast technology. Additionally, a solution for this task is proposed named MQM (Multicast Quality Monitor). The utilization of IP multicast in economically critical environments such as...

    Provided By University of Erlangen-Nuremberg

  • White Papers // May 2007

    Bridging Global and Local Models of Service-Oriented Systems

    A service-oriented system is a collection of independent services that interact with one another through message exchanges. Languages such as the Web Services Description Language (WSDL) and the Business Process Execution Language (BPEL) allow developers to capture the interactions in which an individual service can engage, both from a structural...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2010

    On the Convergence of Iterative Receiver Algorithms Utilizing Hard Decisions

    The convergence of receivers performing Iterative Hard Decision Interference Cancellation (IHDIC) is analyzed in a general framework for ASK, PSK, and QAM constellations. The authors first give an overview of IHDIC algorithms known from the literature applied to linear modulation and DS-CDMA-based transmission systems and show the relation to Hopfield...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2010

    Beamforming for SC-FDMA Transmission Over MIMO ISI Channels With Decision-Feedback Equalization

    The authors consider transmit beamforming algorithms for Single - Carrier Frequency - Division Multiple Access (SC - FDMA) transmission over frequency - selective Multiple - Input Multiple - Output (MIMO) channels. The beamforming filters are designed for optimum performance of MIMO Minimum Mean - Squared Error Decision - Feedback Equalization...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Jan 2009

    Comparison of Receivers for SC-FDMA Transmission Over Frequency-Selective MIMO Channels

    In this paper the performance of different receivers for Single-Carrier Frequency Division Multiple Access (SC-FDMA) transmission over frequency-selective fading channels is investigated. The receiver design is done for a single-user Multiple-Input Multiple-Output (MIMO) system. Linear equalization in frequency domain according to the Minimum Mean-Squared Error (MMSE) criterion is compared to...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2010

    Path Heuristics Using ACO for Inter-Domain Routing in Mobile Ad Hoc and Sensor Networks

    The authors investigate the use of biologically inspired routing heuristics in the field of inter-domain routing in sensor networks. Instead of relying on classical topology control techniques for routing in sensor networks, the use of geographical coordinates has been investigated for self-organized and fully distributed message forwarding. However, the identification...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Jun 2011

    Potential Effects Of The World Economic Crisis On The MENA's Foreign Trade And Regional Economic Integration

    According to the annual Review of Development in Globalization and Regional Integration in the Arab Countries prepared by ESAW in 2008, the current international financial crisis will increase regional economic Integration between MENA countries at the expense of their integration in the world economy. Due to the decreasing global financial...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Mar 2010

    On the Feasibility of UMTS-Based Traffic Information Systems

    Intelligent Transportation Systems (ITS) are a hot topic in the communications society. Currently, research is primarily focusing on setting up Vehicular Ad Hoc NETworks (VANETs) based on WLAN technology. However, VANETs are heavily dependent on high market penetration or infrastructure support. Third-Generation (3G) networks might complement these efforts. They are...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2009

    An Energy Model for Simulation Studies of Wireless Sensor Networks Using OMNeT++

    Simulation is frequently used to evaluate the performance of networking algorithms and techniques in wireless communication networks. However, performance aspects such as the transmission delay, the channel utilization, or the throughput provide only limited information about the feasibility of the particular approach. This is especially the case when investigating Wireless...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2008

    Scalability in Analyzing the Availability of Large-Scale Networks Using Multicast

    The goal of this paper is to identify and discuss scalability issues for the measurement-based analysis of the availability in large-scale networks using IP multicast technology. Additionally, a solution for this task is proposed named MQM (Multicast Quality Monitor). The utilization of IP multicast in economically critical environments such as...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2008

    A Study of Self-Organization Mechanisms in Ad Hoc and Sensor Networks

    Self-organization is a great concept for building scalable systems consisting of a huge number of subsystems. The primary objectives are improved scalability and dynamic adaptation to changing environmental conditions. Until now, many self-organization methods have been developed for communication networks in general and ad hoc networks in particular. Nevertheless, the...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2009

    Self-Localization Capable Mobile Sensor Nodes

    Position sensing systems for indoor environments have one common problem: The setup effort of the whole system. GPS-supported localization is simple and fast to implement and the reference grid is ubiquitous. However, in locations where the signals of GPS are not available, e.g. indoor, or where the technique is not...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Oct 2008

    Improving IEEE 802.15.4 for Low-Latency Energy-Efficient Industrial Applications

    The IEEE 802.15.4 standard for LR-WPANs is becoming a de-facto standard for Wireless Sensor Networks (WSNs) applications in industrial fields. In this paper, the authors evaluate the latency performance of the IEEE 802.15.4 protocol based on a typical industrial scenario: a star network with 20 devices that send short messages...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2010

    Dynamic Operator Replacement in Sensor Networks

    The authors present an integrated approach for supporting in-network sensor data processing in dynamic and heterogeneous sensor networks. The concept relies on data stream processing techniques that define and optimize the distribution of queries and their operators. They anticipate a high degree of dynamics in the network, which can for...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Apr 2010

    Stateful Mobile Modules for Sensor Networks

    Most sensor network applications are dominated by the acquisition of sensor values. Due to energy limitations and high energy costs of communication, in-network processing has been proposed as a means to reduce data transfers. As application demands may change over time and nodes run low on energy, get overloaded, or...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Mar 2010

    Stateful Mobile Modules for Robust In-Network Processing

    Most sensor-network applications are dominated by the acquisition of sensor values. Due to energy limitations and high energy costs of communication, in-network processing has been proposed as a means to reduce data transfers. As application demands may change over time and nodes run low on energy, get overloaded, or simply...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Apr 2009

    QoS-Oriented Integrated Network Planning for Industrial Wireless Sensor Networks

    The authors present an approach for integrated network planning with QoS estimation in a simulation tool for use in industrial environments. The architecture is based on a wireless planning tool that uses measurements or accurate models of the environment to predict physical layer signal distribution. This tool allows the precise...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2011

    SlotSwap: Strong and Affordable Location Privacy in Intelligent Transportation Systems

    Public acceptance, and thus the economic success of an Intelligent Transportation System (ITS), is highly dependent on the quality of deployed privacy mechanisms. In general, neither users nor operators should be able to track a given individual. One approach to facilitate this is the usage of pseudonym pools, which allow...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Apr 2011

    A Decision Support Scheme for Software Process Improvement Prioritization

    Software managers pursuing process improvement initiatives are confronted with the problem of selecting potential improvements. In the field of software quality assurance, suitable decision support for prioritizing the optimization of activities according to their return on investment is not yet available. The authors' paper addresses this research gap. They develop...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Oct 2010

    Conformance Quality and Failure Costs in the Software Industry: An Empirical Analysis of Open Source Software

    The quality cost concept is well known in production economics. Recently, it has received a lot of attention in the field of software engineering. However, empirical studies of the association between failure costs and conformance quality have only been conducted for closed source software projects, but not for open source...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2012

    A Multi-Channel IEEE 1609.4 and 802.11p EDCA Model for the Veins Framework

    Increasing the realism and thereby the explanatory power of Inter-Vehicle Communication (IVC) simulation is an ongoing research topic in the Car-2-X community. The authors contribute to this trend by extending the well-established Veins Framework for the OMNeT++ simulator by a multi-channel simulation model for IEEE 1609.4/802.11p enabling simulative studies to...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Nov 2010

    Mode Switch - Adaptive Use of Delay-Sensitive Or Energy-Aware Communication in IEEE 802.15.4-Based Networks

    The authors propose "Mode switch", an adaptive load-sensitive solution that supports both an energy-efficient operation mode for transmitting normal sensor data and an QoS-aware low-latency mode for high priority emergency messages. Typically, sensor networks are considered to operate efficiently w.r.t. energy consumption. A good example is the IEEE 802.15.4 protocol,...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Mar 2010

    Validating UML Simulation Models With Model-Level Unit Tests

    The paper describes model-level unit tests for model-driven simulation based on UML models. The paper refers to the well-known unit testing method and applies this concept on a higher abstraction level, that is on UML simulation models. The concept of model-based simulation has become more and more popular throughout the...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2009

    Block Processing for One-Dimensional Adaptive Channel Estimation Algorithms for OFDM Systems

    Adaptive pilot-aided channel estimation in frequency domain for Orthogonal Frequency-Division Multiplexing (OFDM) transmission is considered in this paper. More specifically, adaptive block and non-block processing algorithms for the first one-dimensional filtering stage of a two-stage channel estimator are compared. The estimator consists of Two One-Dimensional filtering stages (2 ? 1D)...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Aug 2009

    Robust MBSFN Transmission Using the Golden Code

    Multimedia Broadcast over a Single Frequency Network (MBSFN) has attracted a lot of interest recently. This paper is on Golden coded spatial multiplexing MBSFN transmission using a Soft-Output Sphere Decoder (SOSD) and the impact of such a transceiver on the BLock Error Rate (BLER) system performance. In total, the authors...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Sep 2008

    Comparison of One-Dimensional Adaptive Channel Estimation Techniques for OFDM Systems

    In this paper, adaptive pilot-aided channel estimation for Orthogonal Frequency-Division Multiplexing (OFDM) transmission is addressed. For this purpose, instead of a theoretically optimum Two-Dimensional (2D) filter, two consecutive one-dimensional (2 ? 1D) filters are applied. In particular, three algorithms for the first 1D step are compared, namely Normalized Least-Mean-Squares (NLMS),...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Jun 2009

    Efficient Distribution of Large Files in UMTS Supported by Network Coded M2M Data Transfer With Multiple Generations

    This paper is a sequel of previous work, in which the authors have studied the traffic management problem in UMTS. The main objective was to improve the spectral efficiency of cellular networks by employing network coding supported direct mobile-to-mobile communication on usually underloaded uplink channels for the distribution of a...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Jul 2009

    User Pairing for Multiuser SC-FDMA Transmission Over Virtual MIMO ISI Channels

    This paper proposes different criteria for user pairing for a Virtual Multiple-Input Multiple-Output (V-MIMO) Single-Carrier Frequency-Division Multiple Access (SC-FDMA) transmission over InterSymbol Interference (ISI) channels. Two users, equipped with a single antenna each, transmit their data in the same time slot and frequency band. The receiver at the Base Station...

    Provided By University of Erlangen-Nuremberg

  • White Papers // Feb 2009

    Design and Evaluation of a Multilevel Decoder for Satellite Communications

    In this paper, the authors propose a MultiLevel Coding (MLC) scheme suitable for satellite communications, where different QoS levels are required. They introduce a novel characterization of schemes based on mutual information, called Multi-Stage Decoder (MSD) charts, to aid in the design and evaluation of multilevel coding systems. This characterization...

    Provided By University of Erlangen-Nuremberg

  • White Papers // May 2007

    Bridging Global and Local Models of Service-Oriented Systems

    A service-oriented system is a collection of independent services that interact with one another through message exchanges. Languages such as the Web Services Description Language (WSDL) and the Business Process Execution Language (BPEL) allow developers to capture the interactions in which an individual service can engage, both from a structural...

    Provided By University of Erlangen-Nuremberg