University of Western Macedonia

Displaying 1-20 of 20 results

  • White Papers // May 2013

    Solving Bivariate Polynomial Systems on a GPU

    The authors present a CUDA implementation of dense multivariate polynomial arithmetic based on Fast Fourier Transforms over finite fields. Their core routine computes on the device Graphics Processing Units (GPU) the subresultant chain of two polynomials with respect to a given variable. This subresultant chain is encoded by values on...

    Provided By University of Western Macedonia

  • White Papers // Nov 2012

    Modulation Classification Based on Gaussian Mixture Models Under Multipath Fading Channel

    This paper considers the classification of digital modulation schemes in the presence of multipath fading channels and additive noise. A novel modulation recognition approach is proposed based on Gaussian Mixture Models (GMM). The authors' basic procedure involves parameter estimation using GMM to set up an offline database and then to...

    Provided By University of Western Macedonia

  • White Papers // Jul 2012

    Plain Polynomial Arithmetic on GPU

    As for serial code on CPUs, parallel code on GPUs for dense polynomial arithmetic relies on a combination of asymptotically fast and plain algorithms. Those are employed for data of large and small size, respectively. Parallelizing both types of algorithms is required in order to achieve peak performances. In this...

    Provided By University of Western Macedonia

  • White Papers // Jun 2012

    On the Factor Refinement Principle and its Implementation on Multicore Architectures

    The implementation of non-linear polynomial system solvers is a very active research area. It has been stimulated during the past ten years by two main progresses. Firstly, methods for solving such systems have been improved by the use of so-called modular techniques and asymptotically fast polynomial arithmetic. See the landmark...

    Provided By University of Western Macedonia

  • White Papers // May 2012

    Optimal Direct Path Detection for Positioning With Communication Signals in Indoor Environments

    Recent development in wireless communication-based positioning systems using Time-Of-Arrival (TOA) methods poses a significant challenge for the estimation of signal propagation time in indoor environments. Due to the possible obstruction of the direct path, the signal component from direct propagation can be very weak and therefore, the performance of TOA...

    Provided By University of Western Macedonia

  • White Papers // May 2012

    Physical Layer Authentication in OFDM Systems Based on Hypothesis Testing of CFO Estimates

    Information security is becoming a critical challenge in wireless communications due to the open nature of wireless channels and the transparency of standardized transmission schemes. Among the various wireless security techniques, user authentication is one essential measure to identify legitimate users and protect the integrity of transmissions. In this paper,...

    Provided By University of Western Macedonia

  • White Papers // Oct 2011

    Determinant Computation on the GPU using the Condensation Method

    The authors report on a GPU implementation of the condensation method designed by the researchers for computing the determinant of a matrix. They consider two types of coefficients: modular integers and floating point numbers. They evaluate the performance of their code by measuring its effective bandwidth and argue that it...

    Provided By University of Western Macedonia

  • White Papers // Oct 2011

    Cache Complexity and Multicore Implementation for Univariate Real Root Isolation

    The authors present parallel algorithms with optimal cache complexity for the kernel routine of many real root isolation algorithms, namely the Taylor shift by 1. They then report on multicore implementation for isolating the real roots of univariate polynomials with integer coefficients based on a classical algorithm due to Vincent,...

    Provided By University of Western Macedonia

  • White Papers // Aug 2011

    On Periodic Node Deployment in Wireless Sensor Networks: A Statistical Analysis

    Rapid progress made in the field of sensor technology, wireless communication, and computer networks in recent past, led to the development of wireless ad-hoc sensor networks, consisting of small, low-cost sensors, which can monitor wide and remote areas with precision and liveliness unseen to the date without the intervention of...

    Provided By University of Western Macedonia

  • White Papers // Aug 2011

    Using Strategy Trees in Change Management in Clouds

    Change management in a cloud environment is often complicated by the different needs of the cloud clients. Changes are not applied all at once. For example, a client may require that a change to the Platform-as-Service (PaaS) instance assigned to it must only be done on the weekend while another...

    Provided By University of Western Macedonia

  • White Papers // Jul 2011

    Handling Multicast Video Over Non Multicast Networks

    In this paper, the authors evaluate the basic methods of video transmission, focusing on multicast, the popularity of which has increased over the last years. Although the specific technique is able of reducing significantly the consumption of network resources, such as the bandwidth, the specifications of IEEE 802.11 family networks...

    Provided By University of Western Macedonia

  • White Papers // May 2011

    Towards an Effective Energy Efficient Passive Optical Network

    Communication networks' energy consumption poses a considerable threat to the environment stability. The expansion of access networks, which constitute the main playground of the Internet backhaul, is accompanied by numerous energy inefficient devices and equipments. Passive Optical Networks (PONs) is a potential dominant technology on the field of access networking,...

    Provided By University of Western Macedonia

  • White Papers // Apr 2011

    Towards Realization of the ABC Vision: A Comparative Survey of Access Network Selection

    Access Network Selection (ANS) providing the most appropriate networking technology for accessing and using services in a heterogeneous wireless environment constitutes the heart of the overall handover management procedure. The aim of this paper is to survey representative vertical handover schemes proposed in related research literature with emphasis laid on...

    Provided By University of Western Macedonia

  • White Papers // Apr 2011

    Load Dependent Resource Allocation in Cooperative Multiservice Wireless Networks: Throughput and Delay Analysis

    Cooperative wireless networks supporting multiple services necessitate the application of a robust bandwidth allocation policy to ensure Quality of Service (QoS) provision to different applications. In this work, a load dependent bandwidth allocation technique is presented considering traffic priority and buffer load in the relay nodes of a cooperative communication...

    Provided By University of Western Macedonia

  • White Papers // Aug 2010

    Energy-Efficiency Evaluation of a Medium Access Control Protocol for Cooperative ARQ

    The authors present in this paper the evaluation of the energy consumption of PRCSMA, an 802.11-based medium access control protocol designed to coordinate the retransmissions from the relays in a wireless network implementing a Cooperative Automatic Retransmission ReQuest (C-ARQ) scheme. A comparison in terms of energy efficiency with non-cooperative ARQ...

    Provided By University of Western Macedonia

  • White Papers // Nov 2009

    A Review of Energy Efficiency in Telecommunication Networks

    This paper presents the concept of green telecommunication networks providing information about the power consumption within fixed line and wireless communication networks. It outlines the significance of energy efficiency in modern and future telecommunication networks and suggests directions for optimizing network performance in terms of energy demands. Numerous examples and...

    Provided By University of Western Macedonia

  • White Papers // Sep 2009

    FFT-based Dense Polynomial Arithmetic on Multi-cores

    The authors report efficient implementation techniques for FFT-based dense multivariate polynomial arithmetic over finite fields, targeting multi-cores. They have extended a preliminary study dedicated to polynomial multiplication and obtained a complete set of efficient parallel routines in Cilk++ for polynomial arithmetic such as normal form computation. Since bivariate multiplication applied...

    Provided By University of Western Macedonia

  • White Papers // Sep 2009

    Balanced Dense Polynomial Multiplication on Multi-cores

    In symbolic computation, polynomial multiplication is a fundamental operation akin to matrix multiplication in numerical computation. The authors present efficient implementation strategies for FFT-based dense polynomial multiplication targeting multi-cores. They show that balanced input data can maximize parallel speedup and minimize cache complexity for bivariate multiplication. However, unbalanced input data,...

    Provided By University of Western Macedonia

  • White Papers // Jul 2009

    Applying Quality of Service Prediction in WDM Optical Networks

    A dynamic prediction scheme is presented in this paper, named PROPHET. The purpose of the proposed technique is to predict, given two different classes of Quality of Service (QoS), the total amount of the demanded transmission requests per QoS class. PROPHET is constructed based on Hidden Markov Chains (HMC), modeled...

    Provided By University of Western Macedonia

  • White Papers // May 2008

    A Lightweight Concurrent Fault Detection Scheme for the AES S-Boxes Using Normal Basis

    The use of an appropriate fault detection scheme for hardware implementation of the Advanced Encryption Standard (AES) makes the standard robust to the internal defects and fault attacks. To minimize the overhead cost of the fault detection AES structure, the authors present a lightweight concurrent fault detection scheme for the...

    Provided By University of Western Macedonia

  • White Papers // Aug 2011

    On Periodic Node Deployment in Wireless Sensor Networks: A Statistical Analysis

    Rapid progress made in the field of sensor technology, wireless communication, and computer networks in recent past, led to the development of wireless ad-hoc sensor networks, consisting of small, low-cost sensors, which can monitor wide and remote areas with precision and liveliness unseen to the date without the intervention of...

    Provided By University of Western Macedonia

  • White Papers // Aug 2010

    Energy-Efficiency Evaluation of a Medium Access Control Protocol for Cooperative ARQ

    The authors present in this paper the evaluation of the energy consumption of PRCSMA, an 802.11-based medium access control protocol designed to coordinate the retransmissions from the relays in a wireless network implementing a Cooperative Automatic Retransmission ReQuest (C-ARQ) scheme. A comparison in terms of energy efficiency with non-cooperative ARQ...

    Provided By University of Western Macedonia

  • White Papers // Jul 2011

    Handling Multicast Video Over Non Multicast Networks

    In this paper, the authors evaluate the basic methods of video transmission, focusing on multicast, the popularity of which has increased over the last years. Although the specific technique is able of reducing significantly the consumption of network resources, such as the bandwidth, the specifications of IEEE 802.11 family networks...

    Provided By University of Western Macedonia

  • White Papers // Apr 2011

    Load Dependent Resource Allocation in Cooperative Multiservice Wireless Networks: Throughput and Delay Analysis

    Cooperative wireless networks supporting multiple services necessitate the application of a robust bandwidth allocation policy to ensure Quality of Service (QoS) provision to different applications. In this work, a load dependent bandwidth allocation technique is presented considering traffic priority and buffer load in the relay nodes of a cooperative communication...

    Provided By University of Western Macedonia

  • White Papers // Apr 2011

    Towards Realization of the ABC Vision: A Comparative Survey of Access Network Selection

    Access Network Selection (ANS) providing the most appropriate networking technology for accessing and using services in a heterogeneous wireless environment constitutes the heart of the overall handover management procedure. The aim of this paper is to survey representative vertical handover schemes proposed in related research literature with emphasis laid on...

    Provided By University of Western Macedonia

  • White Papers // May 2011

    Towards an Effective Energy Efficient Passive Optical Network

    Communication networks' energy consumption poses a considerable threat to the environment stability. The expansion of access networks, which constitute the main playground of the Internet backhaul, is accompanied by numerous energy inefficient devices and equipments. Passive Optical Networks (PONs) is a potential dominant technology on the field of access networking,...

    Provided By University of Western Macedonia

  • White Papers // Jul 2009

    Applying Quality of Service Prediction in WDM Optical Networks

    A dynamic prediction scheme is presented in this paper, named PROPHET. The purpose of the proposed technique is to predict, given two different classes of Quality of Service (QoS), the total amount of the demanded transmission requests per QoS class. PROPHET is constructed based on Hidden Markov Chains (HMC), modeled...

    Provided By University of Western Macedonia

  • White Papers // May 2012

    Optimal Direct Path Detection for Positioning With Communication Signals in Indoor Environments

    Recent development in wireless communication-based positioning systems using Time-Of-Arrival (TOA) methods poses a significant challenge for the estimation of signal propagation time in indoor environments. Due to the possible obstruction of the direct path, the signal component from direct propagation can be very weak and therefore, the performance of TOA...

    Provided By University of Western Macedonia

  • White Papers // May 2012

    Physical Layer Authentication in OFDM Systems Based on Hypothesis Testing of CFO Estimates

    Information security is becoming a critical challenge in wireless communications due to the open nature of wireless channels and the transparency of standardized transmission schemes. Among the various wireless security techniques, user authentication is one essential measure to identify legitimate users and protect the integrity of transmissions. In this paper,...

    Provided By University of Western Macedonia

  • White Papers // Aug 2011

    Using Strategy Trees in Change Management in Clouds

    Change management in a cloud environment is often complicated by the different needs of the cloud clients. Changes are not applied all at once. For example, a client may require that a change to the Platform-as-Service (PaaS) instance assigned to it must only be done on the weekend while another...

    Provided By University of Western Macedonia

  • White Papers // Nov 2009

    A Review of Energy Efficiency in Telecommunication Networks

    This paper presents the concept of green telecommunication networks providing information about the power consumption within fixed line and wireless communication networks. It outlines the significance of energy efficiency in modern and future telecommunication networks and suggests directions for optimizing network performance in terms of energy demands. Numerous examples and...

    Provided By University of Western Macedonia

  • White Papers // Nov 2012

    Modulation Classification Based on Gaussian Mixture Models Under Multipath Fading Channel

    This paper considers the classification of digital modulation schemes in the presence of multipath fading channels and additive noise. A novel modulation recognition approach is proposed based on Gaussian Mixture Models (GMM). The authors' basic procedure involves parameter estimation using GMM to set up an offline database and then to...

    Provided By University of Western Macedonia

  • White Papers // Oct 2011

    Determinant Computation on the GPU using the Condensation Method

    The authors report on a GPU implementation of the condensation method designed by the researchers for computing the determinant of a matrix. They consider two types of coefficients: modular integers and floating point numbers. They evaluate the performance of their code by measuring its effective bandwidth and argue that it...

    Provided By University of Western Macedonia

  • White Papers // May 2013

    Solving Bivariate Polynomial Systems on a GPU

    The authors present a CUDA implementation of dense multivariate polynomial arithmetic based on Fast Fourier Transforms over finite fields. Their core routine computes on the device Graphics Processing Units (GPU) the subresultant chain of two polynomials with respect to a given variable. This subresultant chain is encoded by values on...

    Provided By University of Western Macedonia

  • White Papers // Jun 2012

    On the Factor Refinement Principle and its Implementation on Multicore Architectures

    The implementation of non-linear polynomial system solvers is a very active research area. It has been stimulated during the past ten years by two main progresses. Firstly, methods for solving such systems have been improved by the use of so-called modular techniques and asymptotically fast polynomial arithmetic. See the landmark...

    Provided By University of Western Macedonia

  • White Papers // Jul 2012

    Plain Polynomial Arithmetic on GPU

    As for serial code on CPUs, parallel code on GPUs for dense polynomial arithmetic relies on a combination of asymptotically fast and plain algorithms. Those are employed for data of large and small size, respectively. Parallelizing both types of algorithms is required in order to achieve peak performances. In this...

    Provided By University of Western Macedonia

  • White Papers // Sep 2009

    FFT-based Dense Polynomial Arithmetic on Multi-cores

    The authors report efficient implementation techniques for FFT-based dense multivariate polynomial arithmetic over finite fields, targeting multi-cores. They have extended a preliminary study dedicated to polynomial multiplication and obtained a complete set of efficient parallel routines in Cilk++ for polynomial arithmetic such as normal form computation. Since bivariate multiplication applied...

    Provided By University of Western Macedonia

  • White Papers // Sep 2009

    Balanced Dense Polynomial Multiplication on Multi-cores

    In symbolic computation, polynomial multiplication is a fundamental operation akin to matrix multiplication in numerical computation. The authors present efficient implementation strategies for FFT-based dense polynomial multiplication targeting multi-cores. They show that balanced input data can maximize parallel speedup and minimize cache complexity for bivariate multiplication. However, unbalanced input data,...

    Provided By University of Western Macedonia

  • White Papers // Oct 2011

    Cache Complexity and Multicore Implementation for Univariate Real Root Isolation

    The authors present parallel algorithms with optimal cache complexity for the kernel routine of many real root isolation algorithms, namely the Taylor shift by 1. They then report on multicore implementation for isolating the real roots of univariate polynomials with integer coefficients based on a classical algorithm due to Vincent,...

    Provided By University of Western Macedonia

  • White Papers // May 2008

    A Lightweight Concurrent Fault Detection Scheme for the AES S-Boxes Using Normal Basis

    The use of an appropriate fault detection scheme for hardware implementation of the Advanced Encryption Standard (AES) makes the standard robust to the internal defects and fault attacks. To minimize the overhead cost of the fault detection AES structure, the authors present a lightweight concurrent fault detection scheme for the...

    Provided By University of Western Macedonia