Poznan University of Economics

Displaying 1-26 of 26 results

  • White Papers // May 2013

    Digital Signature as a Cloud-based Service

    Recently, cloud has become a new paradigm for delivering computing as a utility. Although the theory behind cloud computing is based on decades of the existing technologies and research, enthusiastic response from developers and widespread acceptance among users confirms that cloud computing is here to stay and likely to play...

    Provided By Poznan University of Economics

  • White Papers // Apr 2013

    Modeling issues and choices in the Data Mining OPtimization Ontology

    The authors describe the Data Mining OPtimization ontology (DMOP), which was developed to support informed decision-making at various choice points of the Knowledge Discovery (KD) process. It can be used as a reference by data miners, but its primary purpose is to automate algorithm and model selection through semantic meta-mining,...

    Provided By Poznan University of Economics

  • White Papers // Mar 2012

    Flexible Quasi-Systematic Precoding for the Out-of-Band Energy Reduction in NC-OFDM

    The reduction of spurious emission is an important issue in future OFDM-based systems, especially in the context of cognitive radio, when the primary users must be protected from the interference. In this paper, flexible quasi-systematic pre-coder is presented for non-contiguous OFDM transmitter, which has the effect of relatively small distortion...

    Provided By Poznan University of Economics

  • White Papers // Jan 2012

    Multi-Path OLSR Performance Analysis in a Large Testbed Environment

    Optimized Link State Routing (OLSR) protocol is a leading proactive routing protocol for Mobile Ad-hoc NETworks (MANETs). Since the OLSR protocol in its standard version does not support multi-path packet forwarding, the authors have developed and implemented its multi-path extension. As a result of a slightly modified path computation algorithm...

    Provided By Poznan University of Economics

  • White Papers // Dec 2011

    Crystallized Rate Regions in MIMO Communications With the Presence of Femtocell Interferers

    In this paper the application of the concept of crystallized rate regions to MIMO transmission with femtocell interference is investigated. Based on the referenced work a new game definition specifying the new cost function derived for MIMO transmission with femtocell interference is proposed. Furthermore, the idea of channel approximation for...

    Provided By Poznan University of Economics

  • White Papers // Dec 2011

    Space Time Turbo Coded OFDM With Joint Transmit and Receive Antenna Selection

    This paper discusses the performance of antenna selection technique in space time turbo coded MIMO-OFDM systems. Multiple-Input Multiple-Output (MIMO) technology can either increase the data rate through spatial multiplexing or improve the reliability through diversity. Space-Time Turbo Codes (STTC) have been proposed to provide robust communications in MIMO wireless environment....

    Provided By Poznan University of Economics

  • White Papers // Oct 2011

    The SDL Library: Querying a Relational Database with an Ontology, Rules and the Jess Engine

    In this paper, the authors present the Semantic Data Library (SDL) which is used to query a relational database at a concept (ontological) level. The SDL integrates a rule engine, a relational database and a set of rules obtained from the transformation of an OWL ontology. This combination allows querying...

    Provided By Poznan University of Economics

  • White Papers // Jul 2011

    From IPv4 to IPv6 - Data Security in the Transition Phase

    IPv4 is a foundation of Internet communication. Designed many years ago the protocol is inadequate in modern networks. New sixth version is replacing the older one. It is often repeated that IPv6 was designated to solve some security problems. This statement is true only to some extent. IPv6 deployment for...

    Provided By Poznan University of Economics

  • White Papers // Mar 2011

    Spectral Analysis of Boosted Space-Time Diversity Scheme

    In this paper the asymptotic performance of a new intuitive space-time diversity scheme is analyzed. So called boosted scheme is compatible with today's WLAN specifications with regard to convolutional coding and bit labelling, and minimizes the number of decoding iterations, required to obtain a reasonable Bit Error Rate. Good properties...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Application of Vernier Interpolation for Digital Time Error Measurement

    Timing (synchronization) signals in telecommunication networks are affected by a variety of distortion processes, which lower their quality. One of such processes is long-term random phase variation (wander), characterized by a bandwidth below 10 Hz. The basic measure for estimating the quality of timing signal is time error TE, being...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Improving Statistical Properties of Number Sequences Generated by Multiplicative Congruential Pseudorandom Generator

    A new method of improving the properties of number sequences produced by a Multiplicative Congruential Pseudorandom Generator (MCPG) was proposed. The characteristic feature of the method is the simultaneous usage of numbers generated by the sawtooth chaotic map, realized in a finitestate machine, and symbols produced by the same map....

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Modeling Step Index Fiber to Soliton Propagation

    Step index fiber modeling process is carried out through numerical solving of eigen-value equation to calculate propagation constant for fundamental mod. Input data in the process is only index of refraction calculated from Sellmeier dispersive formula for appropriate mol percentage doping of germanium dioxide in silica glass fiber. Output data...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    New Tailbiting Convolutional Codes Over Rings

    In this paper a method of using convolutional codes over rings for packet data transmission over Additive White Gaussian Noise (AWGN) channel is proposed. The tailbiting method is generalized and applied to convolutional codes based on ring of integers modulo-M. The codes were named tailbiting codes over ring (TBR). This...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Simulation Study of the IEEE 802.15.4 Standard Low Rate Wireless Personal Area Networks

    The IEEE 802.15.4 standard was created in 2003, and its current form results from the modifications introduced three years later. The specification defines the PHYsical layer (PHY), the Medium Access Control sub-layer (MAC), as well as the principle of their interaction with the higher layers. The LR-WPAN are characterized by...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Diversity and Multiplexing Techniques of 802.11n WLAN

    Common WLAN standards defined by IEEE operate in the ISM (Industrial, Scientific and Medical) bands, i.e. 2.4 GHz and 5.2 GHz. OFDM (Orthogonal Frequency Division Multiplexing) is applied to overcome Inter-Signal Interference (ISI). The transmission runs in a frame mode. Numerous Modulation and Coding Schemes (MCS) are provided, which are...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Packet Dispatching Schemes Supporting Uniform and Nonuniform Traffic Distribution Patterns in MSM Clos-Network Switches

    In this paper new packet dispatching schemes for efficient support of the uniform as well as the non-uniform traffic distribution patterns in Memory-Space-Memory (MSM) Clos-network switches are presented. Three such schemes, called Static Dispatching-First Choice (SD-FC), Static Dispatching-Optimal Choice (SD-OC) and Input Module (IM)-Output Module (OM) Matching (IOM), are proposed...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Streaming Video Over TFRC With Linear Throughput Equation

    The TCP-Friendly Rate Control (TFRC) protocol manifests strong equality towards competing TCP or TCP-friendly flows. Although the RFC 3448 suggests that TFRC is suitable for multimedia, this equality is a great disadvantage in the case of transmitting multimedia over the TFRC. The TFRC emulates TCP-like congestion control using the TCP...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Methods of Real-Time Calculation of Allan Deviation and Time Deviation

    The Allan deviation ADEV and time deviation TDEV allow the type of phase noise affecting the timing signal to be recognized. The parameters are commonly used for evaluation of signals generated by atomic clocks as well as for describing the quality of synchronization signal in the telecommunication networks. The evaluation...

    Provided By Poznan University of Economics

  • White Papers // Aug 2010

    The Impact Of Mismatch Between Salesperson Communication And Buyer's Needs On Mutual Relations

    Despite the important role of communication in the business-to-business sphere, little attention is given to it in publications. The so far conducted research on adapting communication focused on the level and scope of information exchange or marketing in general. However, the explanation to what degree communication, and particularly taking into...

    Provided By Poznan University of Economics

  • White Papers // Aug 2010

    The Mechanism Of Building Business Network Relations In The Internationalisation Process

    The purpose of the paper is to present the idea of the doctoral paper. The proposal will start with the theoretical background explaining the importance of business networks, types of business relationships in terms of the different entities involved in the relations and relationship strength, relationship building process and internationalisation...

    Provided By Poznan University of Economics

  • White Papers // Aug 2010

    Partnership Risk In International Relations

    The paper discusses the problem of partnership risk in a company's relations with other entities on foreign markets. The authors' research (including a mail survey of 2,000 companies) enabled them to identify and measure different types of risk occurring in relations between a company and its customers, suppliers, competitors, and...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    Adaptive Coded Continuous-Phase Modulations for Frequency-Division Multiuser Systems

    In this paper, the authors study adaptive coded modulations for wireless channels. Nonlinearity due to the radio-frequency power amplifier is considered and Continuous-Phase Modulations (CPM) are adopted in order to make the nonlinearity effects negligible. The structure and properties of CPM are reviewed in a semi-tutorial fashion and coded modulation...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    High-Level Design Methodology for Ultra-Fast Software Defined Radio Prototyping on Heterogeneous Platforms

    The design of Software Defined Radio (SDR) equipments (terminals, base stations, etc.) is still very challenging. The authors propose here a design methodology for ultra-fast prototyping on heterogeneous platforms made of GPPs (General Purpose Processors), DSPs (Digital Signal Processors) and FPGAs (Field Programmable Gate Array). Lying on a component-based approach,...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    Game Theory in Wireless Communications With an Application to Signal Synchronization

    This paper is concerned with the general issue of game-theoretic techniques applied to the problem of resource allocation in wireless communication networks. Specifically, its first part is devoted to a tutorial explanation of game theory in the context of CDMA wireless networking, whilst the second part focuses on the particular...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    Trends in Adaptive Modulation and Coding

    This paper presents a review of techniques proposed in the literature that target the best use of resources available in a wireless communication system. These are referred to as Adaptive Modulation and Coding (AMC) techniques. A brief overview of fundamental communication limits, in particular channel capacity, is also provided in...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    Technology as a Need: Trends in the Evolving Information Society

    In this paper, the authors take a broad view on the Information Society and on the Information and Communication Technologies which constitute its technical and, in a sense, social infrastructure. They discuss the fact that today the needs of human beings are strongly influenced by technology, which has become a...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Application of Vernier Interpolation for Digital Time Error Measurement

    Timing (synchronization) signals in telecommunication networks are affected by a variety of distortion processes, which lower their quality. One of such processes is long-term random phase variation (wander), characterized by a bandwidth below 10 Hz. The basic measure for estimating the quality of timing signal is time error TE, being...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Improving Statistical Properties of Number Sequences Generated by Multiplicative Congruential Pseudorandom Generator

    A new method of improving the properties of number sequences produced by a Multiplicative Congruential Pseudorandom Generator (MCPG) was proposed. The characteristic feature of the method is the simultaneous usage of numbers generated by the sawtooth chaotic map, realized in a finitestate machine, and symbols produced by the same map....

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Modeling Step Index Fiber to Soliton Propagation

    Step index fiber modeling process is carried out through numerical solving of eigen-value equation to calculate propagation constant for fundamental mod. Input data in the process is only index of refraction calculated from Sellmeier dispersive formula for appropriate mol percentage doping of germanium dioxide in silica glass fiber. Output data...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    New Tailbiting Convolutional Codes Over Rings

    In this paper a method of using convolutional codes over rings for packet data transmission over Additive White Gaussian Noise (AWGN) channel is proposed. The tailbiting method is generalized and applied to convolutional codes based on ring of integers modulo-M. The codes were named tailbiting codes over ring (TBR). This...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    Adaptive Coded Continuous-Phase Modulations for Frequency-Division Multiuser Systems

    In this paper, the authors study adaptive coded modulations for wireless channels. Nonlinearity due to the radio-frequency power amplifier is considered and Continuous-Phase Modulations (CPM) are adopted in order to make the nonlinearity effects negligible. The structure and properties of CPM are reviewed in a semi-tutorial fashion and coded modulation...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    High-Level Design Methodology for Ultra-Fast Software Defined Radio Prototyping on Heterogeneous Platforms

    The design of Software Defined Radio (SDR) equipments (terminals, base stations, etc.) is still very challenging. The authors propose here a design methodology for ultra-fast prototyping on heterogeneous platforms made of GPPs (General Purpose Processors), DSPs (Digital Signal Processors) and FPGAs (Field Programmable Gate Array). Lying on a component-based approach,...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    Game Theory in Wireless Communications With an Application to Signal Synchronization

    This paper is concerned with the general issue of game-theoretic techniques applied to the problem of resource allocation in wireless communication networks. Specifically, its first part is devoted to a tutorial explanation of game theory in the context of CDMA wireless networking, whilst the second part focuses on the particular...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    Trends in Adaptive Modulation and Coding

    This paper presents a review of techniques proposed in the literature that target the best use of resources available in a wireless communication system. These are referred to as Adaptive Modulation and Coding (AMC) techniques. A brief overview of fundamental communication limits, in particular channel capacity, is also provided in...

    Provided By Poznan University of Economics

  • White Papers // Apr 2010

    Technology as a Need: Trends in the Evolving Information Society

    In this paper, the authors take a broad view on the Information Society and on the Information and Communication Technologies which constitute its technical and, in a sense, social infrastructure. They discuss the fact that today the needs of human beings are strongly influenced by technology, which has become a...

    Provided By Poznan University of Economics

  • White Papers // Aug 2010

    Partnership Risk In International Relations

    The paper discusses the problem of partnership risk in a company's relations with other entities on foreign markets. The authors' research (including a mail survey of 2,000 companies) enabled them to identify and measure different types of risk occurring in relations between a company and its customers, suppliers, competitors, and...

    Provided By Poznan University of Economics

  • White Papers // Aug 2010

    The Impact Of Mismatch Between Salesperson Communication And Buyer's Needs On Mutual Relations

    Despite the important role of communication in the business-to-business sphere, little attention is given to it in publications. The so far conducted research on adapting communication focused on the level and scope of information exchange or marketing in general. However, the explanation to what degree communication, and particularly taking into...

    Provided By Poznan University of Economics

  • White Papers // Aug 2010

    The Mechanism Of Building Business Network Relations In The Internationalisation Process

    The purpose of the paper is to present the idea of the doctoral paper. The proposal will start with the theoretical background explaining the importance of business networks, types of business relationships in terms of the different entities involved in the relations and relationship strength, relationship building process and internationalisation...

    Provided By Poznan University of Economics

  • White Papers // Mar 2012

    Flexible Quasi-Systematic Precoding for the Out-of-Band Energy Reduction in NC-OFDM

    The reduction of spurious emission is an important issue in future OFDM-based systems, especially in the context of cognitive radio, when the primary users must be protected from the interference. In this paper, flexible quasi-systematic pre-coder is presented for non-contiguous OFDM transmitter, which has the effect of relatively small distortion...

    Provided By Poznan University of Economics

  • White Papers // Jan 2012

    Multi-Path OLSR Performance Analysis in a Large Testbed Environment

    Optimized Link State Routing (OLSR) protocol is a leading proactive routing protocol for Mobile Ad-hoc NETworks (MANETs). Since the OLSR protocol in its standard version does not support multi-path packet forwarding, the authors have developed and implemented its multi-path extension. As a result of a slightly modified path computation algorithm...

    Provided By Poznan University of Economics

  • White Papers // Dec 2011

    Crystallized Rate Regions in MIMO Communications With the Presence of Femtocell Interferers

    In this paper the application of the concept of crystallized rate regions to MIMO transmission with femtocell interference is investigated. Based on the referenced work a new game definition specifying the new cost function derived for MIMO transmission with femtocell interference is proposed. Furthermore, the idea of channel approximation for...

    Provided By Poznan University of Economics

  • White Papers // Dec 2011

    Space Time Turbo Coded OFDM With Joint Transmit and Receive Antenna Selection

    This paper discusses the performance of antenna selection technique in space time turbo coded MIMO-OFDM systems. Multiple-Input Multiple-Output (MIMO) technology can either increase the data rate through spatial multiplexing or improve the reliability through diversity. Space-Time Turbo Codes (STTC) have been proposed to provide robust communications in MIMO wireless environment....

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Simulation Study of the IEEE 802.15.4 Standard Low Rate Wireless Personal Area Networks

    The IEEE 802.15.4 standard was created in 2003, and its current form results from the modifications introduced three years later. The specification defines the PHYsical layer (PHY), the Medium Access Control sub-layer (MAC), as well as the principle of their interaction with the higher layers. The LR-WPAN are characterized by...

    Provided By Poznan University of Economics

  • White Papers // Mar 2011

    Spectral Analysis of Boosted Space-Time Diversity Scheme

    In this paper the asymptotic performance of a new intuitive space-time diversity scheme is analyzed. So called boosted scheme is compatible with today's WLAN specifications with regard to convolutional coding and bit labelling, and minimizes the number of decoding iterations, required to obtain a reasonable Bit Error Rate. Good properties...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Diversity and Multiplexing Techniques of 802.11n WLAN

    Common WLAN standards defined by IEEE operate in the ISM (Industrial, Scientific and Medical) bands, i.e. 2.4 GHz and 5.2 GHz. OFDM (Orthogonal Frequency Division Multiplexing) is applied to overcome Inter-Signal Interference (ISI). The transmission runs in a frame mode. Numerous Modulation and Coding Schemes (MCS) are provided, which are...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Packet Dispatching Schemes Supporting Uniform and Nonuniform Traffic Distribution Patterns in MSM Clos-Network Switches

    In this paper new packet dispatching schemes for efficient support of the uniform as well as the non-uniform traffic distribution patterns in Memory-Space-Memory (MSM) Clos-network switches are presented. Three such schemes, called Static Dispatching-First Choice (SD-FC), Static Dispatching-Optimal Choice (SD-OC) and Input Module (IM)-Output Module (OM) Matching (IOM), are proposed...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Streaming Video Over TFRC With Linear Throughput Equation

    The TCP-Friendly Rate Control (TFRC) protocol manifests strong equality towards competing TCP or TCP-friendly flows. Although the RFC 3448 suggests that TFRC is suitable for multimedia, this equality is a great disadvantage in the case of transmitting multimedia over the TFRC. The TFRC emulates TCP-like congestion control using the TCP...

    Provided By Poznan University of Economics

  • White Papers // Nov 2010

    Methods of Real-Time Calculation of Allan Deviation and Time Deviation

    The Allan deviation ADEV and time deviation TDEV allow the type of phase noise affecting the timing signal to be recognized. The parameters are commonly used for evaluation of signals generated by atomic clocks as well as for describing the quality of synchronization signal in the telecommunication networks. The evaluation...

    Provided By Poznan University of Economics

  • White Papers // Apr 2013

    Modeling issues and choices in the Data Mining OPtimization Ontology

    The authors describe the Data Mining OPtimization ontology (DMOP), which was developed to support informed decision-making at various choice points of the Knowledge Discovery (KD) process. It can be used as a reference by data miners, but its primary purpose is to automate algorithm and model selection through semantic meta-mining,...

    Provided By Poznan University of Economics

  • White Papers // Oct 2011

    The SDL Library: Querying a Relational Database with an Ontology, Rules and the Jess Engine

    In this paper, the authors present the Semantic Data Library (SDL) which is used to query a relational database at a concept (ontological) level. The SDL integrates a rule engine, a relational database and a set of rules obtained from the transformation of an OWL ontology. This combination allows querying...

    Provided By Poznan University of Economics

  • White Papers // May 2013

    Digital Signature as a Cloud-based Service

    Recently, cloud has become a new paradigm for delivering computing as a utility. Although the theory behind cloud computing is based on decades of the existing technologies and research, enthusiastic response from developers and widespread acceptance among users confirms that cloud computing is here to stay and likely to play...

    Provided By Poznan University of Economics

  • White Papers // Jul 2011

    From IPv4 to IPv6 - Data Security in the Transition Phase

    IPv4 is a foundation of Internet communication. Designed many years ago the protocol is inadequate in modern networks. New sixth version is replacing the older one. It is often repeated that IPv6 was designated to solve some security problems. This statement is true only to some extent. IPv6 deployment for...

    Provided By Poznan University of Economics