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Universitat Oberta de Catalunya
(34 results)-
White Papers
Prevention of Cross-Site Scripting Attacks on Current Web Applications
February 25, 2008, 12:00am PST
Security is becoming one of the major concerns for web applications and other Internet based services, which are becoming pervasive in all kinds of business models and organizations. Web...
Provided by Universitat Oberta de Catalunya
-
White Papers
Reliable Process for Security Policy Deployment
May 9, 2009, 12:00am PDT
The authors focus in this paper on the problem of configuring and managing network security devices, such as Firewalls, Virtual Private Network (VPN) tunnels, and Intrusion Detection Systems...
Provided by Universitat Oberta de Catalunya
-
White Papers
A Survey on Cross-Site Scripting Attacks
May 29, 2009, 12:00am PDT
Web applications are becoming truly pervasive in all kinds of business models and organizations. Today, most critical systems such as those related to health care, banking, or even emergency...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Vertical WLAN Handover Algorithm and Protocol to Improve the IPTV QoS of the End User
May 24, 2012, 12:00am PDT
The appearance of several IEEE 802.11 variants made possible the availability of many wireless local area network access options for end users in the same location. Network requirements for IPTV...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Optimal Pilot Design and Power Control in Correlated MISO Links
May 24, 2012, 12:00am PDT
The authors study the maximization of an achievable ergodic rate expression of a Multiple-Input Single-Output (MISO) channel where both ends are cognizant of the same erroneous estimate of the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Intruder Tracking in WSNs Using Binary Detection Sensors and Mobile Sinks
March 12, 2012, 12:00am PDT
Powered by digital transmission advances in recent years, Wireless Sensor Networks (WSNs) are beginning to experience a boom in different areas. Of special interest are those applications offering...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Mutual Information Maximization for a Wireless Energy Harvesting Node Considering the Circuitry Power Consumption
January 1, 2013, 12:00am PST
An energy harvesting transmitter operating in a point-to-point link through a discrete time fading channel is considered in this paper. Assuming non-causal knowledge of the harvested energy and...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Hierarchical Identity-Based (Lossy) Trapdoor Functions
September 2, 2012, 12:00am PDT
Lossy trapdoor functions, introduced by Peikert and Waters, have received a lot of attention in the last years, because of their wide range of applications in theoretical cryptography. The notion...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Spectrum Occupancy in Realistic Scenarios and Duty Cycle Model for Cognitive Radio
April 1, 2010, 12:00am PDT
Most of the spectrum occupancy measurement campaigns performed to the date in the context of cognitive radio are based on measurements in outdoor high points such as building roofs, balconies and...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Methodological Aspects of Spectrum Occupancy Evaluation in the Context of Cognitive Radio
September 6, 2010, 12:00am PDT
Cognitive radio has recently emerged as a promising solution to conciliate the existing conflicts between spectrum demand growth and spectrum under-utilisation. The basic underlying idea is to...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Towards a More Efficient Spectrum Usage: Spectrum Sensing and Cognitive Radio Techniques
January 17, 2011, 12:00am PST
The traditional approach of dealing with spectrum management in wireless communications has been the definition of a licensed user granted with exclusive exploitation rights for a specific...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Improved Energy Detection Spectrum Sensing for Cognitive Radio
June 24, 2012, 12:00am PDT
Energy detection constitutes a preferred approach for spectrum sensing in cognitive radio due to its simplicity and applicability (it works irrespective of the signal format to be detected) as...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
A Real-Time Testbed for Heterogeneous Wireless Networks
January 3, 2010, 12:00am PST
Trends in wireless communications are evolving towards the integration of different radio access networks and technologies into heterogeneous infrastructures. This type of communication networks...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
The Real-Time AROMA Testbed for All-IP Heterogeneous Wireless Access Networks
January 4, 2010, 12:00am PST
This paper describes the real-time testbed that has been developed in the framework of the European AROMA project. The objective of the AROMA project is to devise and assess a set of specific...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
A Real-Time Platform for End-to-Edge QoS Evaluation in Heterogeneous Networks
January 4, 2010, 12:00am PST
This paper describes a platform developed in the framework of the European AROMA project that allows emulating in real-time a complex heterogeneous wireless access network. The objective of the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Quality of Experience Evaluation Under QoS-Aware Mobility Mechanisms
January 4, 2010, 12:00am PST
Next generation wireless networks will encompass a wide range of heterogeneous technologies in the radio access part. In such networks, the all-IP paradigm has been identified as a promising...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
End-to-Edge QoS Across Heterogeneous Wireless and Wired Domains
July 31, 2008, 12:00am PDT
Oriented to heterogeneity in every sense, next generation wireless networks are aimed to fulfill constantly increasing users' prospects. Relying on the all-IP paradigm, expectations suppose...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Spectral Occupancy Measurements in Urban Areas and Their Applicability to the Blind Standard Recognition Sensor Concept
January 4, 2010, 12:00am PST
Cognitive Radio (CR) has been paid much attention in both academic and industrial domains during the last years for its potential capability to solve to the so-called spectrum scar-city problem....
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Performance of Spectrum Sensing for Cognitive Radio Based on Field Measurements of Various Radio Technologies
February 1, 2010, 12:00am PST
Despite its practical performance limitations, energy detection has gained popularity during the last years as a spectrum sensing technique for dynamic spectrum access in cognitive radio networks....
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Spectral Occupation Measurements and Blind Standard Recognition Sensor for Cognitive Radio Networks
January 4, 2010, 12:00am PST
Cognitive radio has been claimed to be a hopeful solution to the existing conflicts between spectrum demand growth and spectrum underutilization. The basic underlying idea of cognitive radio is to...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
On the Spectrum Occupancy Perception of Cognitive Radio Terminals in Realistic Scenarios
June 23, 2010, 12:00am PDT
Cognitive radio terminals sense the spectrum to detect temporarily unoccupied spectrum gaps and transmit. The behavior of a network of cognitive radio terminals therefore depends on the spectrum...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Spatial Duty Cycle Model for Cognitive Radio
October 13, 2010, 12:00am PDT
Spectrum occupancy modeling in the context of Dynamic Spectrum Access/Cognitive Radio (DSA/CR) constitutes a rather unexplored research area that still requires much more effort. This paper...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Joint Learning-Detection Framework: An Empirical Analysis
November 22, 2010, 12:00am PST
Within a context of Cognitive Radio, the authors explore the possibility to detect the presence of users on a given band with no a priori knowledge on the environment. This paper ventures the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
A Radio Spectrum Measurement Platform for Spectrum Surveying in Cognitive Radio
March 28, 2011, 12:00am PDT
This paper presents a sophisticated radio spectrum measurement platform specifically envisaged and designed for spectrum occupancy surveys in the context of Dynamic Spectrum Access/Cognitive Radio...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Discrete-Time Spectrum Occupancy Model Based on Markov Chain and Duty Cycle Models
May 16, 2011, 12:00am PDT
This paper presents an empirical time-dimension model of spectrum use in the context of dynamic spectrum access. Concretely, a discrete-time two-state Markov chain with novel duty cycle models is...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
An Overview of Spectrum Occupancy Models for Cognitive Radio Networks
May 16, 2011, 12:00am PDT
The Dynamic Spectrum Access (DSA) paradigm based on the Cognitive Radio (CR) technology has emerged as a promising solution to conciliate the existing conflicts between spectrum demand growth and...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Graphene-Enabled Wireless Communication for Massive Multicore Architectures
November 29, 2012, 12:00am PST
Current trends in microprocessor architecture design are leading towards a dramatic increase of core-level parallelization, wherein a given number of independent processors or cores are...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
An Analytical Model for the LISP Cache Size
February 27, 2012, 12:00am PST
Concerns regarding the scalability of the inter-domain routing have encouraged researchers to start elaborating a more robust Internet architecture. While consensus on the exact form of the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Networking Challenges and Principles in Diffusion-Based Molecular Communication
September 3, 2012, 12:00am PDT
Nanotechnology has allowed building nanomachines capable of performing simple tasks, such as sensing, data storage or actuation. Nanonetworks, networks of nanomachines, will allow cooperation and...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
LISP-TREE: A DNS Hierarchy to Support the LISP Mapping System
March 14, 2010, 12:00am PST
During the last years several operators have expressed concerns about the continued growth of the BGP routing tables in the default-free zone. Proposed solutions for this issue are centered around...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Quorum Sensing-Enabled Amplification for Molecular Nanonetworks
February 18, 2012, 12:00am PST
Nanotechnology is enabling the development of devices in a scale ranging from a few to hundreds of nanometers. The nanonetworks that result from interconnecting these devices greatly expand the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Improving Soft Frequency Reuse for Realistic OFDMA-Based Cellular Deployments
November 21, 2012, 12:00am PST
Effective interference management is a technical challenge of utmost importance for emerging OFDMA-based technologies such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave...
Provided by Universitat Oberta de Catalunya
-
White Papers
UML/OCL Verification in Practice
September 14, 2008, 12:00am PDT
In the MDD approaches, models become the primary artifact of the development process and the basis for code generation. Identifying defects early, at the model-level, can help to reduce...
Provided by Universitat Oberta de Catalunya
-
White Papers
Verifying UML/OCL Operation Contracts
December 1, 2008, 12:00am PST
In current model-driven development approaches, software models are the primary artifacts of the development process. Therefore, assessment of their correctness is a key issue to ensure the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Improving Soft Frequency Reuse for Realistic OFDMA-Based Cellular Deployments
November 21, 2012, 12:00am PST
Effective interference management is a technical challenge of utmost importance for emerging OFDMA-based technologies such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Quorum Sensing-Enabled Amplification for Molecular Nanonetworks
February 18, 2012, 12:00am PST
Nanotechnology is enabling the development of devices in a scale ranging from a few to hundreds of nanometers. The nanonetworks that result from interconnecting these devices greatly expand the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
LISP-TREE: A DNS Hierarchy to Support the LISP Mapping System
March 14, 2010, 12:00am PST
During the last years several operators have expressed concerns about the continued growth of the BGP routing tables in the default-free zone. Proposed solutions for this issue are centered around...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Networking Challenges and Principles in Diffusion-Based Molecular Communication
September 3, 2012, 12:00am PDT
Nanotechnology has allowed building nanomachines capable of performing simple tasks, such as sensing, data storage or actuation. Nanonetworks, networks of nanomachines, will allow cooperation and...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
An Analytical Model for the LISP Cache Size
February 27, 2012, 12:00am PST
Concerns regarding the scalability of the inter-domain routing have encouraged researchers to start elaborating a more robust Internet architecture. While consensus on the exact form of the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Graphene-Enabled Wireless Communication for Massive Multicore Architectures
November 29, 2012, 12:00am PST
Current trends in microprocessor architecture design are leading towards a dramatic increase of core-level parallelization, wherein a given number of independent processors or cores are...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
An Overview of Spectrum Occupancy Models for Cognitive Radio Networks
May 16, 2011, 12:00am PDT
The Dynamic Spectrum Access (DSA) paradigm based on the Cognitive Radio (CR) technology has emerged as a promising solution to conciliate the existing conflicts between spectrum demand growth and...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Discrete-Time Spectrum Occupancy Model Based on Markov Chain and Duty Cycle Models
May 16, 2011, 12:00am PDT
This paper presents an empirical time-dimension model of spectrum use in the context of dynamic spectrum access. Concretely, a discrete-time two-state Markov chain with novel duty cycle models is...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
A Radio Spectrum Measurement Platform for Spectrum Surveying in Cognitive Radio
March 28, 2011, 12:00am PDT
This paper presents a sophisticated radio spectrum measurement platform specifically envisaged and designed for spectrum occupancy surveys in the context of Dynamic Spectrum Access/Cognitive Radio...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Joint Learning-Detection Framework: An Empirical Analysis
November 22, 2010, 12:00am PST
Within a context of Cognitive Radio, the authors explore the possibility to detect the presence of users on a given band with no a priori knowledge on the environment. This paper ventures the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Spatial Duty Cycle Model for Cognitive Radio
October 13, 2010, 12:00am PDT
Spectrum occupancy modeling in the context of Dynamic Spectrum Access/Cognitive Radio (DSA/CR) constitutes a rather unexplored research area that still requires much more effort. This paper...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
On the Spectrum Occupancy Perception of Cognitive Radio Terminals in Realistic Scenarios
June 23, 2010, 12:00am PDT
Cognitive radio terminals sense the spectrum to detect temporarily unoccupied spectrum gaps and transmit. The behavior of a network of cognitive radio terminals therefore depends on the spectrum...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Spectral Occupation Measurements and Blind Standard Recognition Sensor for Cognitive Radio Networks
January 4, 2010, 12:00am PST
Cognitive radio has been claimed to be a hopeful solution to the existing conflicts between spectrum demand growth and spectrum underutilization. The basic underlying idea of cognitive radio is to...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Performance of Spectrum Sensing for Cognitive Radio Based on Field Measurements of Various Radio Technologies
February 1, 2010, 12:00am PST
Despite its practical performance limitations, energy detection has gained popularity during the last years as a spectrum sensing technique for dynamic spectrum access in cognitive radio networks....
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Spectral Occupancy Measurements in Urban Areas and Their Applicability to the Blind Standard Recognition Sensor Concept
January 4, 2010, 12:00am PST
Cognitive Radio (CR) has been paid much attention in both academic and industrial domains during the last years for its potential capability to solve to the so-called spectrum scar-city problem....
Provided by Universitat Oberta de Catalunya
-
Whitepapers
End-to-Edge QoS Across Heterogeneous Wireless and Wired Domains
July 31, 2008, 12:00am PDT
Oriented to heterogeneity in every sense, next generation wireless networks are aimed to fulfill constantly increasing users' prospects. Relying on the all-IP paradigm, expectations suppose...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Quality of Experience Evaluation Under QoS-Aware Mobility Mechanisms
January 4, 2010, 12:00am PST
Next generation wireless networks will encompass a wide range of heterogeneous technologies in the radio access part. In such networks, the all-IP paradigm has been identified as a promising...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
A Real-Time Platform for End-to-Edge QoS Evaluation in Heterogeneous Networks
January 4, 2010, 12:00am PST
This paper describes a platform developed in the framework of the European AROMA project that allows emulating in real-time a complex heterogeneous wireless access network. The objective of the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
The Real-Time AROMA Testbed for All-IP Heterogeneous Wireless Access Networks
January 4, 2010, 12:00am PST
This paper describes the real-time testbed that has been developed in the framework of the European AROMA project. The objective of the AROMA project is to devise and assess a set of specific...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
A Real-Time Testbed for Heterogeneous Wireless Networks
January 3, 2010, 12:00am PST
Trends in wireless communications are evolving towards the integration of different radio access networks and technologies into heterogeneous infrastructures. This type of communication networks...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Improved Energy Detection Spectrum Sensing for Cognitive Radio
June 24, 2012, 12:00am PDT
Energy detection constitutes a preferred approach for spectrum sensing in cognitive radio due to its simplicity and applicability (it works irrespective of the signal format to be detected) as...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Towards a More Efficient Spectrum Usage: Spectrum Sensing and Cognitive Radio Techniques
January 17, 2011, 12:00am PST
The traditional approach of dealing with spectrum management in wireless communications has been the definition of a licensed user granted with exclusive exploitation rights for a specific...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Methodological Aspects of Spectrum Occupancy Evaluation in the Context of Cognitive Radio
September 6, 2010, 12:00am PDT
Cognitive radio has recently emerged as a promising solution to conciliate the existing conflicts between spectrum demand growth and spectrum under-utilisation. The basic underlying idea is to...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Spectrum Occupancy in Realistic Scenarios and Duty Cycle Model for Cognitive Radio
April 1, 2010, 12:00am PDT
Most of the spectrum occupancy measurement campaigns performed to the date in the context of cognitive radio are based on measurements in outdoor high points such as building roofs, balconies and...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Hierarchical Identity-Based (Lossy) Trapdoor Functions
September 2, 2012, 12:00am PDT
Lossy trapdoor functions, introduced by Peikert and Waters, have received a lot of attention in the last years, because of their wide range of applications in theoretical cryptography. The notion...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Mutual Information Maximization for a Wireless Energy Harvesting Node Considering the Circuitry Power Consumption
January 1, 2013, 12:00am PST
An energy harvesting transmitter operating in a point-to-point link through a discrete time fading channel is considered in this paper. Assuming non-causal knowledge of the harvested energy and...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Intruder Tracking in WSNs Using Binary Detection Sensors and Mobile Sinks
March 12, 2012, 12:00am PDT
Powered by digital transmission advances in recent years, Wireless Sensor Networks (WSNs) are beginning to experience a boom in different areas. Of special interest are those applications offering...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Optimal Pilot Design and Power Control in Correlated MISO Links
May 24, 2012, 12:00am PDT
The authors study the maximization of an achievable ergodic rate expression of a Multiple-Input Single-Output (MISO) channel where both ends are cognizant of the same erroneous estimate of the...
Provided by Universitat Oberta de Catalunya
-
Whitepapers
Vertical WLAN Handover Algorithm and Protocol to Improve the IPTV QoS of the End User
May 24, 2012, 12:00am PDT
The appearance of several IEEE 802.11 variants made possible the availability of many wireless local area network access options for end users in the same location. Network requirements for IPTV...
Provided by Universitat Oberta de Catalunya
-
White Papers
Verifying UML/OCL Operation Contracts
December 1, 2008, 12:00am PST
In current model-driven development approaches, software models are the primary artifacts of the development process. Therefore, assessment of their correctness is a key issue to ensure the...
Provided by Universitat Oberta de Catalunya
-
White Papers
A Survey on Cross-Site Scripting Attacks
May 29, 2009, 12:00am PDT
Web applications are becoming truly pervasive in all kinds of business models and organizations. Today, most critical systems such as those related to health care, banking, or even emergency...
Provided by Universitat Oberta de Catalunya
-
White Papers
Reliable Process for Security Policy Deployment
May 9, 2009, 12:00am PDT
The authors focus in this paper on the problem of configuring and managing network security devices, such as Firewalls, Virtual Private Network (VPN) tunnels, and Intrusion Detection Systems...
Provided by Universitat Oberta de Catalunya
-
White Papers
Prevention of Cross-Site Scripting Attacks on Current Web Applications
February 25, 2008, 12:00am PST
Security is becoming one of the major concerns for web applications and other Internet based services, which are becoming pervasive in all kinds of business models and organizations. Web...
Provided by Universitat Oberta de Catalunya
-
White Papers
UML/OCL Verification in Practice
September 14, 2008, 12:00am PDT
In the MDD approaches, models become the primary artifact of the development process and the basis for code generation. Identifying defects early, at the model-level, can help to reduce...
Provided by Universitat Oberta de Catalunya
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