University of Debrecen

Displaying 1-13 of 13 results

  • White Papers // Nov 2012

    An Interference Alignment Based Precoder Design Using Channel Statistics for OFDM Systems With Insufficient Cyclic Prefix

    In an OFDM system, IDFT and CP insertion at the transmitter together with CP removal and DFT at the receiver help to convert an inter-symbol interference channel into several ISI free sub-channels. The CP length is designed no less than the length of the Channel Impulse Response (CIR) in order...

    Provided By University of Debrecen

  • White Papers // Sep 2012

    Reliability of Swarming Algorithms for Mobile Sensor Network Applications

    There are many well-studied swarming algorithms which are often suited to very specific purposes. As mobile sensor networks become increasingly complex, and are comprised of more and more agents, it makes sense to consider swarming algorithms for movement control. The authors introduce a natural way to measure the reliability of...

    Provided By University of Debrecen

  • White Papers // Jun 2012

    MODA A Framework for Memory Centric Performance Characterization

    In the age of massive parallelism, the focus of performance analysis has switched from the processor and related structures to the memory and I/O resources. Adapting to this new reality, a performance analysis tool has to provide a way to analyze resource usage to pinpoint existing and potential problems in...

    Provided By University of Debrecen

  • White Papers // May 2012

    Effective Relay Selection for Lifetime Maximization in Decode-and-Forward Networks When Only Mean Channel Gain Is Available at Transmitter Side

    In this paper, for an energy-constrained two-stage selective Decode-and-Forward (DF) relaying network which employs a Best-Select form of cooperation, the authors focus on maximizing the minimum node lifetime when only the mean Channel State Information (CSI) toward the destination is available at each relay node. If only the mean CSI...

    Provided By University of Debrecen

  • White Papers // May 2012

    Cooperative Performance and Diversity Analysis for Wireless Relay Networks

    In this paper, the error rate performance and diversity gain of Amplify-and-Forward (AF) wireless relay networks are studied. The Distributed Space-Time Block Code (DSTBC) in a synchronous relay network with multiple relay nodes is considered. The distributed linear dispersion code is used at the relays. The symbol (or codeword) error...

    Provided By University of Debrecen

  • White Papers // May 2012

    A Full Diversity PIC Group Decoding for a Family of Space-Time Block Codes

    A Partial Interference Cancellation (PIC) group decoding as well as a full diversity design criterion were recently proposed for space-time block code. The PIC group decoding complexity is between the lowest linear decoding complexity and the highest ML decoding complexity, and so is the code rate. Based on the criterion...

    Provided By University of Debrecen

  • White Papers // May 2012

    On the Optimum Number of Hops in a Multi-Hop Linear Network With Randomly Located Nodes

    In this paper, the authors propose a novel linear network model to characterize the randomness in the node locations. Unlike most previous work which usually assumes that the nodes are uniformly distributed on a line, they consider a linear network with randomly located nodes. They model the randomness in distance...

    Provided By University of Debrecen

  • White Papers // Mar 2012

    A Co-Prime Blur Scheme for Data Security in Video Surveillance

    This paper presents a novel Coprime Blurred Pair (CBP) model for visual data-hiding for security in camera surveillance. While most previous approaches have focused on completely encrypting the video stream, the authors introduce a spatial encryption scheme by blurring the image/video contents to create a CBP. Their goal is to...

    Provided By University of Debrecen

  • White Papers // Mar 2012

    Energy-Efficient Transmission for MIMO Interference Channels

    In the previous works on Multiple-Input Multiple-Output (MIMO) interference channels, it is usually assumed that the transmit power is fixed and only MIMO beam-forming is applied to mitigate interference. In this paper, the authors design the transmit powers and beam-forming vectors jointly for each transmit-receive pairs (links) to maximize the...

    Provided By University of Debrecen

  • White Papers // Jul 2010

    Domain Driven Data Mining - Application to Business

    Conventional data mining applications face serious difficulties in solving complex real-life business decision making problems when practically deployed. This paper in order to improve the operations in a collection of business domains aims to suggest solutions by reviewing and studying the latest methodological, technical, practical progresses and some case studies...

    Provided By University of Debrecen

  • White Papers // Oct 2009

    VoIP LAN/MAN Traffic Analysis for NGN QoS Management

    Strict requirement is emphasized regarding QoS guarantees of the NGN (Next Generation Network) networks today. DiffServ mechanism is applied mostly for classification of protocol data units of real time and conventional information streams in LAN/MAN environment. The dependence of VoIP traffic characteristics of the delay and the jitter sensitive IP...

    Provided By University of Debrecen

  • White Papers // Aug 2009

    Analyze The Financing Structure Of Agricultural Enterprises In 2002-2006

    The capital structure of agricultural enterprises notable modified since the change in Hungary's economic system. The paper discusses the capital structure of agricultural enterprises in Hungary and analyzes the most significant indicators that we can use to describe the financing situation of the firms. My empirical analysis is based on...

    Provided By University of Debrecen

  • White Papers // Jun 2007

    Towards UserCentric Metrics for Denial-Of-Service Measurement

    To date, the measurement of user-perceived degradation of quality of service during Denial of Service (DoS) attacks remained an elusive goal. Current approaches mostly rely on lower level traffic measurements such as throughput, utilization, loss rate, and latency. They fail to monitor all traffic parameters that signal service degradation for...

    Provided By University of Debrecen

  • White Papers // Sep 2012

    Reliability of Swarming Algorithms for Mobile Sensor Network Applications

    There are many well-studied swarming algorithms which are often suited to very specific purposes. As mobile sensor networks become increasingly complex, and are comprised of more and more agents, it makes sense to consider swarming algorithms for movement control. The authors introduce a natural way to measure the reliability of...

    Provided By University of Debrecen

  • White Papers // May 2012

    Effective Relay Selection for Lifetime Maximization in Decode-and-Forward Networks When Only Mean Channel Gain Is Available at Transmitter Side

    In this paper, for an energy-constrained two-stage selective Decode-and-Forward (DF) relaying network which employs a Best-Select form of cooperation, the authors focus on maximizing the minimum node lifetime when only the mean Channel State Information (CSI) toward the destination is available at each relay node. If only the mean CSI...

    Provided By University of Debrecen

  • White Papers // May 2012

    Cooperative Performance and Diversity Analysis for Wireless Relay Networks

    In this paper, the error rate performance and diversity gain of Amplify-and-Forward (AF) wireless relay networks are studied. The Distributed Space-Time Block Code (DSTBC) in a synchronous relay network with multiple relay nodes is considered. The distributed linear dispersion code is used at the relays. The symbol (or codeword) error...

    Provided By University of Debrecen

  • White Papers // May 2012

    A Full Diversity PIC Group Decoding for a Family of Space-Time Block Codes

    A Partial Interference Cancellation (PIC) group decoding as well as a full diversity design criterion were recently proposed for space-time block code. The PIC group decoding complexity is between the lowest linear decoding complexity and the highest ML decoding complexity, and so is the code rate. Based on the criterion...

    Provided By University of Debrecen

  • White Papers // May 2012

    On the Optimum Number of Hops in a Multi-Hop Linear Network With Randomly Located Nodes

    In this paper, the authors propose a novel linear network model to characterize the randomness in the node locations. Unlike most previous work which usually assumes that the nodes are uniformly distributed on a line, they consider a linear network with randomly located nodes. They model the randomness in distance...

    Provided By University of Debrecen

  • White Papers // Mar 2012

    Energy-Efficient Transmission for MIMO Interference Channels

    In the previous works on Multiple-Input Multiple-Output (MIMO) interference channels, it is usually assumed that the transmit power is fixed and only MIMO beam-forming is applied to mitigate interference. In this paper, the authors design the transmit powers and beam-forming vectors jointly for each transmit-receive pairs (links) to maximize the...

    Provided By University of Debrecen

  • White Papers // Mar 2012

    A Co-Prime Blur Scheme for Data Security in Video Surveillance

    This paper presents a novel Coprime Blurred Pair (CBP) model for visual data-hiding for security in camera surveillance. While most previous approaches have focused on completely encrypting the video stream, the authors introduce a spatial encryption scheme by blurring the image/video contents to create a CBP. Their goal is to...

    Provided By University of Debrecen

  • White Papers // Nov 2012

    An Interference Alignment Based Precoder Design Using Channel Statistics for OFDM Systems With Insufficient Cyclic Prefix

    In an OFDM system, IDFT and CP insertion at the transmitter together with CP removal and DFT at the receiver help to convert an inter-symbol interference channel into several ISI free sub-channels. The CP length is designed no less than the length of the Channel Impulse Response (CIR) in order...

    Provided By University of Debrecen

  • White Papers // Jun 2007

    Towards UserCentric Metrics for Denial-Of-Service Measurement

    To date, the measurement of user-perceived degradation of quality of service during Denial of Service (DoS) attacks remained an elusive goal. Current approaches mostly rely on lower level traffic measurements such as throughput, utilization, loss rate, and latency. They fail to monitor all traffic parameters that signal service degradation for...

    Provided By University of Debrecen

  • White Papers // Oct 2009

    VoIP LAN/MAN Traffic Analysis for NGN QoS Management

    Strict requirement is emphasized regarding QoS guarantees of the NGN (Next Generation Network) networks today. DiffServ mechanism is applied mostly for classification of protocol data units of real time and conventional information streams in LAN/MAN environment. The dependence of VoIP traffic characteristics of the delay and the jitter sensitive IP...

    Provided By University of Debrecen

  • White Papers // Jul 2010

    Domain Driven Data Mining - Application to Business

    Conventional data mining applications face serious difficulties in solving complex real-life business decision making problems when practically deployed. This paper in order to improve the operations in a collection of business domains aims to suggest solutions by reviewing and studying the latest methodological, technical, practical progresses and some case studies...

    Provided By University of Debrecen

  • White Papers // Aug 2009

    Analyze The Financing Structure Of Agricultural Enterprises In 2002-2006

    The capital structure of agricultural enterprises notable modified since the change in Hungary's economic system. The paper discusses the capital structure of agricultural enterprises in Hungary and analyzes the most significant indicators that we can use to describe the financing situation of the firms. My empirical analysis is based on...

    Provided By University of Debrecen

  • White Papers // Jun 2012

    MODA A Framework for Memory Centric Performance Characterization

    In the age of massive parallelism, the focus of performance analysis has switched from the processor and related structures to the memory and I/O resources. Adapting to this new reality, a performance analysis tool has to provide a way to analyze resource usage to pinpoint existing and potential problems in...

    Provided By University of Debrecen