IARIA

Displaying 561-600 of 1223 results

  • White Papers // Oct 2011

    Component-Based Software System Dependency Metrics Based on Component Information Flow Measurements

    The motivation of this paper is that the measurement based on the flow of information connecting software components can be used to evaluate component-based software system dependency. The ability to measure system dependency implies the capability to locate weakness in the system design and to determine the level of software...

    Provided By IARIA

  • White Papers // Oct 2011

    Module Interactions for Model-Driven Engineering of Complex Behaviour of Autonomous Robots

    In this paper, the authors describe a model-driven engineering approach that enables the complete description, validation, verification and deployment of behaviour to autonomous robots, directly, and automatically from the models. This realizes the promises and benefits of model-driven engineering, such as platform-independent development and behaviour traceability. However, such a top-down...

    Provided By IARIA

  • White Papers // Oct 2011

    Case Study for a Quality-Oriented Service Design Process

    Due to the usage of distributed information, such as sensor information, geographical information systems are designed according to service-oriented principles. Thus, the development of new solutions within this context requires a design of necessary services. These services have to follow certain quality attributes that have evolved as important for services,...

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  • White Papers // Oct 2011

    Meta-Model for Global Software Development to Support Portability and Interoperability in Global Software Development

    Global Software Development (GSD) considers the coordinated activity of software development that is not localized and central but geographically distributed. To support coordination among sites, usually it is aimed to adopt the same development and execution platform. Unfortunately, adopting a single platform might not be always possible due to technical...

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  • White Papers // Oct 2011

    A New Approach to Software Development Process With Formal Modeling of Behavior Based on Visualization

    This paper investigates the advantages and limitations of various modeling methods. Despite of their advantages, due to some limitations of each modeling method, using only one of them as the sole approach will not ensure high quality software. This paper proposes a new feasible approach to improve the software development...

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  • White Papers // Oct 2011

    Non-Functional Requirements for Business Processes in the Context of Service-Oriented Architectures

    The authors present novel concepts to formalize and apply Non-Functional Requirements (NFRs) for business processes in the context of Service-Oriented Architectures (SOAs). Today, popular languages for modeling business processes do not support the specification of NFRs in a systematic manner. However, there is a strong demand to explicitly address such...

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  • White Papers // Oct 2011

    PSW: A Framework-Based Tool Integration Solution for Global Collaborative Software Development

    The market of solutions for collaborative and distributed software development offers currently a wide range of tools that support specific tasks involved in these kind of projects. Several solutions aim to support the whole development process in a single tool or via groups of tools by providing distributed teams the...

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  • White Papers // Oct 2011

    Feature-Oriented Programming and Context-Oriented Programming: Comparing Paradigm Characteristics by Example Implementations

    Software variability can be supported by providing adaptations on top of a program's core behavior. For defining and composing adaptations in a program, different paradigms have been proposed. Two of them are feature-oriented programming and context-oriented programming. This paper compares an exemplar implementation of each paradigm. For the comparison, a...

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  • White Papers // Oct 2011

    Soft Constraints in Feature Models

    Feature Models represent admissible configurations of products in Software Product Lines. Constraints are used to represent domain specific knowledge, such as requiring or excluding a feature in the presence of another. Configurations failing to conform to these constraints are deemed invalid. However, in many cases useful domain information cannot be...

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  • White Papers // Oct 2011

    Feature Modeling of Software as a Service Domain to Support Application Architecture Design

    Cloud computing is an emerging computing paradigm that has gained broad interest in the industry. SaaS architectures vary widely according to the application category and number of tenants. To define a proper SaaS architecture it is important to have a proper understanding of the domain. Based on the authors' extensive...

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  • White Papers // Oct 2011

    Adding Support for Hardware Devices to Component Models for Embedded Systems

    Component-based development promises many improvements in developing software for embedded systems, e.g., greater reuse of once written software, less error-prone development process, greater analyzability of systems and shorter time needed for overall development. One of the aspects commonly left out of component models is communication of software components with hardware...

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  • White Papers // Oct 2011

    A Service Component Framework for Multi-User Scenario Management in Ubiquitous Environments

    Software dedicated to ubiquitous environments has to deal with the multiplicity of devices and users. It also has to adapt to frequent changes in its environment. Users can easily access and trigger services provided by different devices but also need to implement complex scenarios, i.e., structured compositions of multiple service....

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  • White Papers // Oct 2011

    A Systematic Mapping Study on Patient Data Privacy and Security for Software System Development

    The exchange of Electronic Health Records (EHR) has increased threats to patient data privacy and security. The software systems developed for healthcare sector are required to explicitly address patient data privacy and security. A number of solutions have been proposed to incorporate these requirements into the software systems. However, there...

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  • White Papers // Oct 2011

    OntoLog: Using Web Semantic and Ontology for Security Log Analysis

    Along with the growth of available information on the internet, grows too the number of attacks to the Web systems. The Web applications became a new target to those invaders, due to the popularization of the Web 2.0 and 3.0, as well as the access to the social networks system's...

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  • White Papers // Oct 2011

    Security Quality Assurance on Web Applications

    Historically, it is well known that issues related to security of software applications are normally omitted by the development teams owing to a lack of expertise or knowledge in security policies. With the emergence of WEB technologies, this situation became more serious. Entire systems, complex or not, have outstanding access...

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  • White Papers // Oct 2011

    On Generating Security Implementations From Models of Embedded Systems

    Designing secure embedded systems is a challenging task. Many of the challenges unique to embedded systems in this regard are due to the constraints that these systems have and thus impacts that security features will have on other properties of the system. Therefore, security decisions should be considered from early...

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  • White Papers // Oct 2011

    Proposal for Ground Shipping High Volume of Data Parameter in Supersampling Unmanned Aircraft Through Radio Modem

    In an unmanned aircraft, large volumes of data are generated by the various sensors installed on the aircraft. At critical moments such as take-off, landing, parachute openings, or when the aircraft performs sudden maneuvers, additional parameters besides the default need to be sampled in order n to understand completely the...

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  • White Papers // Oct 2011

    UML-Based Modeling of Non-Functional Requirements in Telecommunication Systems

    Successful design of real-time embedded systems relies heavily on the successful satisfaction of their non-functional requirements. Model-driven engineering is a promising approach for coping with the design complexity of embedded systems. However, when it comes to modeling non-functional requirements and covering specific aspects of different domains and types of embedded...

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  • White Papers // Oct 2011

    A Maintenance Approach of a BJI Index Configuration

    In data warehousing domain, OLAP (On Line Analytical Processing) queries are complex since they use several tables with huge cardinalities. Several optimization techniques have been studied in the literature as materialized views and Bitmap Join Indexes (BJI). BJI indexes are useful to pre-calculate star joins in order to reduce the...

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  • White Papers // Oct 2011

    Software Cache Eviction Policy Based on Stochastic Approach

    This paper develops an innovative approach for guiding high-level software caches' eviction policy. The decision on which data to keep in the cache is made according to a stochastic analysis over the application data access behaviour. This approach shows it is possible to achieve high cache hit ratios with a...

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  • White Papers // Oct 2011

    Performance Simulation of a System's Parallelization

    A new approach to simulate the parallelization of a software function is presented in this paper. The parallelization's effects onto the system's performance prior to a costly realization of the parallelization are evaluated, leading to a more gain-oriented performance optimization. The presented approach defines a methodology to transform a single-threaded...

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  • White Papers // Oct 2011

    Towards Executable Business Processes With the Problem Oriented Engineering Process Algebra

    The paper introduces a process algebra for business process models. The algebra is located within Problem Oriented Engineering, a framework for engineering design, and is based on a process pattern defined by Hall and Rapanotti by which Problem Oriented Engineering developments should be structured. The pattern is a generator for...

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  • White Papers // Oct 2011

    Optimal Functionality and Domain Data Clustering Based on Latent Dirichlet Allocation

    This paper presents a new approach for clustering domain data and application functionality, based on the Latent Dirichlet Allocation. The methodology, developed here, performs an optimal clustering by identifying input values that lead to the best possible clustering output. The optimal solutions are identified through the use of the Silhouette...

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  • White Papers // Oct 2011

    Functional Complexity Measurement: Proposals and Evaluations

    Several definitions of measures that aim at representing the size of software requirements are currently available. These measures have gained a quite relevant role, since they are one of the few types of objective data upon which effort estimation can be based. However, traditional Functional Size Measures do not take...

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  • White Papers // Oct 2011

    Component-Oriented Software Development With UML

    This paper proposes to automate the process of structural and behavior analysis of component-oriented software fully specified in UML. The structural specification uses component, class and deployment diagrams, and the behavior specification, state machine diagram. The produced structural analysis tool analyzes a connection between pairs of components at a time....

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  • White Papers // Oct 2011

    Metrics in Distributed Product Development

    Now-a-days, the products are increasingly developed globally in collaboration between subcontractors, third party suppliers and in-house developers. However, management of a distributed product development project is proven to be more challenging and complicated than traditional one-site development. From the viewpoint of project management, the measurements and metrics are important activities...

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  • White Papers // Oct 2011

    Edola: A Domain Modeling and Verification Language for PLC Systems

    Formal modeling and verification of PLC systems become paramount in engineering applications. The paper presents a novel PLC domain-specific modeling language Edola. Important characteristics of PLC embedded systems, such as reactivity, scan cycling, real-time and property patterns, are embodied in the language design. Formal verification methods, such as model checking...

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  • White Papers // Oct 2011

    A Practical Method for the Reachability Analysis of Real-Time Systems Modelled as Timed Automata

    Real-Time Systems (RTSs) interact with their environment under time constraints. Such constraints are so critical because any deviation from the specified deadlines might have severe consequences on both the human lives and the environment. To develop reliable RTSs, formal methods should be used along the development life cycle. Verification is...

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  • White Papers // Oct 2011

    Reverse Engineering of Graphical User Interfaces

    This paper describes a dynamic reverse engineering approach and the correspondent tool, ReGUI, developed to reduce the effort of obtaining visual and formal models of both the structure and the behaviour of a software application's graphical user interface. This paper describes the tool's architecture, the exploration process it follows, the...

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  • White Papers // Oct 2011

    Towards Design Method Based on Formalisms of Petri Nets, DEVS, and UML

    Software system development uses specific development techniques and processes to reach desired goals, whereas different kinds of systems usually need to use different approaches. Obviously, there are used different techniques, tools, and formalisms in each development process and the designed models should be automatically or manually transformed to the next...

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  • White Papers // Oct 2011

    Invariant Preservation by Component Composition Using Semantical Interface Automata

    Component assembly is based on the verification of the compatibility between the component interface specifications. In general, these specifications do not combine the three levels of the compatibility check: behavioral protocols, signatures, and semantics of operations. In this paper, the authors enrich the formalism of interface automata, used to specify...

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  • White Papers // Oct 2011

    Method for CMMI-DEV Implementation in Distributed Teams

    Organizations tend to perform their work in offshore sites to become more competitive. But managing these teams is not an easy task because it is needed a great level of coordination. So, some organizations adopt maturity models as CMMI-DEV to normalize and coordinate the tasks across the different sites. But...

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  • White Papers // Oct 2011

    Advanced Object Oriented Metrics for Process Measurement

    Process improvement requires measurement of specific attributes of process. Measurement of a process gives them a clear insight into the system. It provides effective ways of estimation and evaluation. Then, it is essential to develop a set metrics covering the attributes. Computed measures are used as indicators for process improvement...

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  • White Papers // Oct 2011

    Quality Issues in Global Software Development

    The most advantageous features of Global Software Development (GSD) are its cost saving benefits and the easily availability of resources. Also the technological advancement especially in Information and Communication Technology (ICT) makes GSD a common practice in software industry. But GSD is also facing a lot of challenges. Maintaining quality...

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  • White Papers // Oct 2011

    A Systematic Review of Self-Adaptation in Service-Oriented Architectures

    The study of adaptivity, i.e., the capability to react to changes in the environment, is becoming ever more important in many fields of study, and in the development of software in particular. This paper presents a systematic review in which both the extension and complexity of this notion are examined....

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  • White Papers // Oct 2011

    A Formal Specification of G-DTD:A Conceptual Model to Describe XML Documents

    This paper provides a formal specification in Z of a conceptual model for an XML document called Graph-Document Type Definition (G-DTD). This model has been used for describing XML documents at the schema level and also assists the user to arrange the content of XML documents. More importantly G-DTD can...

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  • White Papers // Oct 2011

    E-FOTO: Development of an Open-Source Educational Digital Photogrammetric Workstation

    The E-FOTO project aims to develop an educational, digital photogrammetric workstation, under the General Public License (GNU/GPL). E-FOTO software does not intend to overcome commercial software solutions in its field. Its main purpose is to provide a software solution that could be used by anyone who is interested in learning...

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  • White Papers // Oct 2011

    Vitalizing Local ICT-Industry by Acceleration of FLOSS-Based Software Product Development: A Case Study of the ICT-Industry in Okinawa

    Occupational condition differentials between major enterprises in areas around central Japan and small-medium-enterprises in rural area are caused by hierarchical structure in Japanese industries on the Information Communication Technologies (ICT). In order to remove this in-adequate situation, the authors have drawn a blueprint to reform the ICT-industry by proposing a...

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  • White Papers // Oct 2011

    Empirical Case Study of Measuring Productivity of Programming Language Ruby and Ruby on Rails

    This paper is intended as a trial balloon of the evaluation of open source software, by measuring the productivity of programming language Ruby and web application framework Ruby on Rails, compared with other open source software. According to TIOBE Programming Community Index, which announces the ranking based on the retrieval...

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  • White Papers // Oct 2011

    Performance Evaluation of a Generic Deployment Infrastructure for Component-Based S/W Engineering

    The authors present a generic deployment infrastructure for distributed component-based applications. This infrastructure is based on OMG's deployment and configuration specification and model driven architecture paradigm. Even though their approach is experimented for enterprise Java beans model, it can be extended to other specific models. They suggest the use of...

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  • White Papers // Feb 2012

    Application Design Over Named Data Networking With Its Features in Mind

    Designed around host-reachability, today's Internet architecture faces many limitations while serving data-oriented applications, which produce most traffic load to the Internet. Many clean-slate designs of the content/data oriented network have emerged to adapt to these needs. Named Data Networking (also known as CCN) is one of these designs to address...

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  • White Papers // Feb 2012

    Feedback, Transport Layer Protocols and Buffer Sizing

    A key aspect of network performance is coupled with the design of transport layer protocols, the choice of feedback from queues, and by the buffer sizing requirements at routers. In this paper, the authors consider some transport protocols which use different feedback mechanisms to manage their flow and congestion control....

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  • White Papers // Feb 2012

    Towards Opportunistic Data Dissemination in Mobile Phone Sensor Networks

    Recently, there has been a growing interest within the research community in developing opportunistic routing protocols. Many schemes have been proposed; however, they differ greatly in assumptions and in type of network for which they are evaluated. As a result, researchers have an ambiguous understanding of how these schemes compare...

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  • White Papers // Feb 2012

    Selective Link Cost Alteration in Reservation-Based Multi-Hop Wireless Mesh Networks

    Link state protocol-driven wireless mesh networks are known for their flexible and highly scalable structure, due to a high degree of individuality, in terms of routing table generation in each connected node. QoS-focused research allows these nodes now to make accurate next-hop decisions based on QoS-sensitive routing metrics. This development...

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  • White Papers // Feb 2012

    Reliable Technology for Wireless Mesh Networks With Low System Requirements

    In this paper IQMESH, new networking technology for wireless mesh networks, its basic principles and related routing algorithms are presented. The presented technology was developed especially for applications in the field of buildings automation and telemetry. However, other applications such as smart grids or street lighting can also benefit from...

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  • White Papers // Feb 2012

    Forwarding and Routing Stateless Multi-Hop Protocol for Wireless Sensor Networks

    Energy conservation can be achieved by the use of clustering routing protocols in Wireless Sensor Networks (WSN). The people have a great impact on the system lifetime. In these WSNs, the concepts of communication between Cluster Head (CH) nodes and Base Station (BS), data aggregation and round can be approached...

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  • White Papers // Feb 2012

    Resource Management for Advanced, Heterogeneous Sensor-Actor-Networks

    Sensor-Actor-NETworks (SANET) consist of several heterogeneous subsystems, which provide specific capabilities for measuring or manipulating its environment. During the run-time, the communication infrastructure as well as communication tasks and the available communication resources are changing dynamically. Furthermore, advanced application scenarios in this domain have strict requirements regarding to the minimal...

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  • White Papers // Feb 2012

    Improving Fairness in Wireless Mesh Networks

    Wireless Mesh Networks (WMNs) are networks that aim to establish hybrid wireless communications in areas with little or no telecommunication infrastructure available. The main motivation of these networks in Brazil and other developing countries, particularly in remote areas, is providing Internet access in places without commercial infrastructure and where the...

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  • White Papers // Feb 2012

    MANET With the Q-Routing Protocol

    With ad hoc networks having much more advantages over other types of networks in a mobile world, this made it an attractive field for many protocols. In this paper, the authors propose an implementation of the Q-Routing protocol working over a mobile ad hoc network to enhance the performance of...

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  • White Papers // Feb 2012

    Estimation of Collision Multiplicities in IEEE 802.11-Based WLANs

    Estimating the Collision Multiplicity (CM), i.e. the number of users involved in a collision, is a key task in MultiPacket Reception (MPR) approaches and in Collision Resolution (CR) techniques. A new technique is proposed for IEEE 802.11 networks. The technique is based on recent advances in random matrix theory and...

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  • White Papers // Feb 2012

    CTC Turbo Decoding Architecture for LTE Systems Implemented on FPGA

    This paper describes a turbo decoder for Long Term Evolution (LTE) standard, release 8, using a Max Log MAP algorithm. The Forward Error Correction (FEC) block dimensions, as indicated in the standard, are inside a range of 40 to 6144 bits. The coding rate is 1/3, the puncturing block not...

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  • White Papers // Feb 2012

    Multi-Relay Cooperative NB-LDPC Coding With Non-Binary Repetition Codes

    In this paper, the authors propose a system based on non-binary Low-Density Parity-Check (LDPC) codes to communicate efficiently over the multiple-relay fading channels, with a simple joint decoding strategy at the receiver end. The particularity of their approach is to rely on non-binary LDPC codes at the source, coupled with...

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  • White Papers // Feb 2012

    A Redundancy Information Protocol for P2P Networks in Ubiquitous Computing Environments: Design and Implementation

    The ubiquitous computing vision brings high computational and communication demands. In this paper, the authors propose a high availability protocol for information replication in ubiquitous computing environments. Running at the application layer, on top of a P2P overlay network based on JXTA, the protocol allows the transfer of multimedia contents...

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  • White Papers // Sep 2011

    Towards Green HPC Blueprints

    Effectiveness and power consumption is becoming a major problem in high-performance computing. Numbers of researchers are working on methodologies in order to increase efficiency of these systems on hardware and software levels. Several "Green" technologies are explained in this paper along with their pros and cons, with the aim of...

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  • White Papers // Sep 2011

    A Linear Programming Approach for Optimizing Workload Distribution in a Cloud

    Cloud computing's usage-based pricing model creates an incentive for subscribers to optimize the utilization of the rented resources. The goal of the current paper is to devise a formal approach for distributing workload among a minimum number of servers. The paper models this problem as a set partitioning problem and...

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  • White Papers // Sep 2011

    Distributed Storage Support in Private Clouds Based on Static Scheduling Algorithms

    This paper is focused on an extension to an open source Infrastructure as a Service Cloud called Eucalytpus for supporting distributed storage according to a defined storage strategy. As a proof of concept, three algorithms known from the scheduling theory were implemented, namely MonteCarlo, Round Robin and Weighted Queuing. To...

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  • White Papers // Sep 2011

    Measuring Elasticity for Cloud Databases

    The rise of the Internet and the multiplication of data sources have multiplied the number of "Bigdata" storage problems. These data sets are not only very big but also tend to grow very fast, sometimes in a short period. Distributed databases that work well for such data sets need to...

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  • White Papers // Sep 2011

    Efficient Management of Hybrid Clouds

    Cloud computing has become a significant technology trend driven by big players that is transforming the current IT industry. Public cloud computing comes with advantages such as cost savings, high availability, and easy scalability. However, Small and Medium-sized Enterprises are driven by different reasons for not outsourcing their IT infrastructure...

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  • White Papers // Sep 2011

    Cloud Computing and Its Application to Blended Learning in Engineering

    The education process in engineering means theory and practice, individual study, group-based projects or experimental work that involves equipment, simulation/emulation software packages and laboratory applications. In order to develop e-learning platforms for higher and postgraduate education in engineering, new methodologies should be taken into consideration: project- and problem based learning,...

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  • White Papers // Sep 2011

    On-Demand Data Integration on the Cloud

    On-demand data integration is among the key challenges in Cloud Computing. In this paper, the authors present an ontology-based framework for describing and integrating data on the fly to answer transient business needs. They provide a semantic modeling for cloud's data services. The proposed modeling makes it possible to automatically...

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  • White Papers // Sep 2011

    UnaCloud: Opportunistic Cloud Computing Infrastructure as a Service

    This paper presents UnaCloud: an opportunistic cloud computing Infrastructure as a Service (IaaS) model implementation, which provides at lower cost than dedicated cloud infrastructures, basic computing resources (processing, storage and networking) to run arbitrary software, including operating systems and applications. The IaaS model is provided through the opportunistic use of...

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  • White Papers // Sep 2011

    Deterministic Execution of Multiprocessor Virtual Machines

    Deterministic execution offers a lot of benefits for debugging, fault tolerance, security of multiprocessor systems. Most previous work to address this issue either depends on custom hardware or needs to recompile the program. Some others combine the hardware and software technologies. The authors' goal, in this paper is to provide...

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  • White Papers // Sep 2011

    A Generalized Approach for Fault Tolerance and Load Based Scheduling of Threads in Alchemi .Net

    Computational grids can be best utilized by the divide and conquer approach, when it comes to executing a large process. In order to achieve this, building multithreaded application is one of the efficient approaches. The threads are scheduled on different computational nodes for execution. One of the frameworks that support...

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  • White Papers // Sep 2011

    On the Performance Isolation Across Virtual Network Adapters in Xen

    Virtualization has recently become a very popular technique for utilizing hardware capabilities and lowering infrastructure and maintenance costs. However, making several virtual machines share the same resources can potentially introduce performance isolation problems. Depending on the application, proper quality of service and the performance isolation may present critical requirements for...

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  • White Papers // Sep 2011

    Reducing the Human Cost of Grid Computing With GlideinWMS

    The switch from dedicated, tightly controlled compute clusters to a widely distributed, shared Grid infrastructure has introduced significant operational overheads. If not properly managed, this human cost could grow to a point where it would undermine the benefits of increased resource availability of Grid computing. The glide in WMS system...

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  • White Papers // Apr 2012

    Dual-Lag Correlation-Based Feature Detection of OFDM Signals With Cyclic Phase Compensation

    This paper presents cyclostationarity-based spectrum sensing algorithm implementation for detection of OFDM signals. The detector utilizes two distinct auto-correlation delays and introduces compensation of the phase difference between the two cyclic auto-correlation functions. This improves detection sensitivity (or alternatively reduces detection time) compared to other similar algorithms while maintaining the...

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  • White Papers // Apr 2012

    NC-OFDM Cognitive Radio Optimal Pilot Placement for the LS Estimator

    A theoretical contradiction between the areas of the optimal pilot-pattern design and the optimal power loading algorithms has been found to exist for proposed Non-Contiguous Orthogonal Frequency-Division Multiplexing (NCOFDM) Cognitive Radio (CR) systems. It has been found that the proposed, optimal pilot-patterns specify that the Secondary User (SU) should convert...

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  • White Papers // Apr 2012

    Cooperative Jam Technique to Increase Physical-Layer Security in CWSN

    This paper considers the problem of secure communication in Wireless Sensor Networks in the presence of non-colluding passive eavesdroppers. Cognitive networks capabilities such as spectrum sensing, share information and collaboration to optimize the communications can be used to avoid attacks. A collaborative jamming technique is proposed to increase Cognitive Wireless...

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  • White Papers // Apr 2012

    Joint Optimal Spectrum Sensing Time and Power Allocation in Ultra Wideband Cognitive Radio Networks

    Ultra WideBand (UWB) system is overlapped with various wireless systems, such as WLAN, WiMax and UMTS, which limits the use of UWB. Cognitive Radio (CR) enables UWB systems to efficiently use the overlapped spectrum without causing interference to other wireless systems. In this paper, the authors focus on the low-complexity...

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  • White Papers // Apr 2012

    CRN Survey and a Simple Sequential MAC Protocol for CRN Learning

    With the idea to use the spectrum band efficiently, much of the research is being published in the field of cognitive radio network to share the licensed spectrum band with unlicensed users when licensed users are not active. Cognitive Radio Network (CRN) has introduced a lot of new challenges in...

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  • White Papers // Apr 2012

    Cognitive Wireless Sensor Networks Framework for Green Communications Design

    Cognitive Wireless Sensor Networks is an emerging technology with great potential to avoid traditional wireless problems such as reliability, interferences and spectrum scarcity. Because of the Wireless Sensor Network fast growth and the use of batteries, current rate of power consumption per unit of data cannot be sustained. Therefore, one...

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  • White Papers // Apr 2012

    Testbed for Cognitive Radio Networks Based on USRP2/N200 Modules

    This paper deals with description of software defined radio test-bed based on USRP2/N200 modules available from ETTUS research. The aim of this test-bed is to develop and test the algorithms for cognitive radio mobile networks. The primary focus is on the spectrum sensing in moving secondary users scenario, adaptation of...

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  • White Papers // Apr 2012

    Smart Noise - Linearity Breakdown in Homodyne Multi-Standard Radio Receivers

    This paper analyzes the noise - linearity breakdown in direct conversion multi-standard radio receivers embedding analog signal conditioning. The paper's main goal is to develop a systematic noise - linearity partitioning methodology to be used in splitting the multi-standard receiver noise and linearity budget between its High Frequency (HF) part...

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  • White Papers // Apr 2012

    Optimal Algorithm for Cognitive Spectrum Decision Making

    In this paper, an optimal algorithm of spectrum decision making is presented for a real cognitive radio network with tree-based topology. All nodes of a subnet in such network have the capability in being aware of spectrum information by both energy detector based sensing and centralized cooperative sensing. After gathering...

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  • White Papers // Apr 2012

    Learning-Based Spectrum Sensing in OFDM Cognitive Radios

    In this paper, spectrum sensing in OFDM-based cognitive radio systems is modeled as a pattern recognition problem. The proposed scheme uses a linear classifier to decide on when the spectrum is busy (class 1) or not busy (class 2). Two types of feature vectors are compared in this work, namely...

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  • White Papers // Apr 2012

    Developing Cognitive Strategies for Reducing Energy Consumption in Wireless Sensor Networks

    Due to Information and Communication Technologies, wireless data traffic is growing with a rate higher than 25% annually. Wireless Sensor Networks (WSNs) represent nowadays one of the most rapidly expanding sectors in wireless networks. In this context, applying reducing power consumption in WSN scenarios is a great challenge to face...

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  • White Papers // Jul 2011

    IPSAG Cognitive Radio Routing Protocol: Models and Performance

    The paper is about performance evaluation of the IP Spectrum Aware Geographic routing protocol (IPSAG). IPSAG is an opportunistic cognitive routing protocol, which determines a source-destination route in a hop-by-hop manner, based on global and local information. Simulation results are reported for a particular case of IPSAG, where the Cognitive...

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  • White Papers // Jul 2011

    Improving Spectrum Sensing Performance by Using Eigenvectors

    In this paper, the authors present a method to improve the performance of eigenvalue-based detection, facilitated with eigenvectors of the sample covariance matrix. They focus on the multi-sensor detection of a single source case. If the channel is constant over adjacent sensing slots, it can be blindly estimated by using...

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  • White Papers // Jul 2011

    Impact of Control Channel Design on Cooperative Spectrum Sensing in Opportunistic Spectrum Access Networks

    In Opportunistic Spectrum Access (OSA) networks, Secondary unlicensed Users (SUs) need a common Control Channel (CC) to identify the spectrum opportunities, i.e., common spectrum holes unused by licensed Primary Users (PUs). Typically, an interference-free CC is unrealistically assumed in the paper. In this paper, the authors evaluate the impact of...

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  • White Papers // Jul 2011

    Broadcast Signaling for a Centralized Cognitive Radio Network With Distributed Control

    For signaling and controlling a centralized Cognitive Radio Network (CRN) with users operating in different sets of channels, a dedicated common control channel is not a useful approach. Different strategies have been studied for this CRN control, some of them using time division mechanisms. This is because employing a channel...

    Provided By IARIA