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University of Oslo
(63 results)-
White Papers
Exploiting Reconfigurable Hardware for Network Security
January 1, 2009, 12:00am PST
One type of network security strategy is using an Intrusion Detection System (IDS). They are implementing IDS in FPGA-based (Field Programmable Gate Array) reconfigurable hardware. This is to...
Provided by University of Oslo
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Whitepapers
Learning-Based Routing in Mobile Wireless Sensor Networks
January 15, 2012, 12:00am PST
Limited energy supply is a chief concern when dealing with Wireless Sensor Networks (WSNs). Thus, among other issues, routing protocols for WSNs should be designed with the goal of being energy...
Provided by University of Oslo
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White Papers
Mixed Language Programming for High-Performance Computing Applications
January 1, 2010, 12:00am PST
First, different styles of programming in the languages Fortran 77, C, C++, and Python are reviewed and exemplified in the context of representing and computing with sparse matrices. Special...
Provided by University of Oslo
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Whitepapers
The Nornir Run-Time System for Parallel Programs Using Kahn Process Networks
September 15, 2009, 12:00am PDT
Shared-memory concurrency is the prevalent paradigm used for developing parallel applications targeted towards small- and middle-sized machines, but experience has shown that it is hard to use....
Provided by University of Oslo
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White Papers
Automatically Deriving UML Sequence Diagrams From Use Cases
April 1, 2010, 12:00am PDT
Use cases are commonly used to structure and document requirements during requirement elicitation while sequence diagrams are often used during the analysis phase to document use cases as objects'...
Provided by University of Oslo
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White Papers
Encoding Cultural Heritage Information for the SemanticWeb. Procedures for Data Integration through CIDOC-CRMMapping
February 14, 2008, 12:00am PST
Access to data, interoperability and standard structure are vital to guarantee the usability and usefulness of Cultural Heritage records, which are digitally archived in a myriad of different ways...
Provided by University of Oslo
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White Papers
The Business Cycle Implications Of Reciprocity In Labor Relations
November 17, 2007, 12:00am PST
The authors develop a reciprocity-based model of wage determination and incorporate it into a modern dynamic general equilibrium framework. They estimate the model and find that, among potential...
Provided by University of Oslo
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White Papers
Comparing Evolvable Hardware to Conventional Classifiers for Electromyographic Prosthetic Hand Control
June 6, 2008, 12:00am PDT
Evolvable hardware has shown to be a promising approach for prosthetic hand controllers as it features self adaptation, fast training, and a compact system-on-chip implementation. Besides these...
Provided by University of Oslo
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White Papers
Access Of Experts: Information And EU Decision Making
April 25, 2009, 12:00am PDT
This paper examines patterns of participation in the large expert group system under the European Commission. The authors explore competing propositions about the character of the Commission's...
Provided by University of Oslo
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White Papers
Reliability and Fault Tolerance of Ultra Low Voltage High Speed Differential CMOS
March 20, 2009, 12:00am PDT
The reliability and fault tolerance of the differential ultra low voltage gate is elaborated in this paper. The gates optimal yield and defect tolerance compared to ULV gate and standard CMOS is...
Provided by University of Oslo
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White Papers
Increasing the Secrecy Capacity by Cooperation in Wireless Networks
October 21, 2009, 12:00am PDT
Physical layer security is an emerging security field that explores the possibilities of achieving perfect secrecy data transmission between the intended network nodes, while possible malicious...
Provided by University of Oslo
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White Papers
Heterogeneous Firms Or Heterogeneous Workers?
June 1, 2010, 12:00am PDT
The authors expect trade liberalization to give rise to aggregate productivity gains, as the least efficient firms are forced out, and labor is reallocated towards the best performing firms. But...
Provided by University of Oslo
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White Papers
Secure Satellite Communication Systems Design With Individual Secrecy Rate Constraints
March 13, 2011, 12:00am PST
In this paper, the authors study multibeam satellite secure communication through PHYsical (PHY) layer security techniques, i.e., joint power control and beamforming. By first assuming that the...
Provided by University of Oslo
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White Papers
Chameleon: Adaptive Peer-to-Peer Streaming With Network Coding
December 20, 2009, 12:00am PST
Layered streaming can be used to adapt to the available download capacity of an end-user, and such adaptation is very much required in real world HTTP media streaming. The multiple layer codec has...
Provided by University of Oslo
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White Papers
Quality-And Context-Aware Neighbor Selection for Layered Peer-to-Peer Streaming
February 28, 2010, 12:00am PST
Layered streaming is being considered as the most promising approach to adapt to bandwidth variations and heterogeneous end users in streaming applications. The goal of a layered streaming...
Provided by University of Oslo
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White Papers
Stir: Spontaneous Social Peer-to-Peer Streaming
March 9, 2011, 12:00am PST
Dealing with a high churn rate is very challenging in live peer-to-peer streaming. State-of-the-art studies try to mitigate the problem by exploiting peer dynamic models, analyzing traces from...
Provided by University of Oslo
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White Papers
Distributed Coalition Formation Games for Secure Wireless Transmission
November 13, 2009, 12:00am PST
Cooperation among wireless nodes has been recently proposed for improving the PHYsical layer (PHY) security of wireless transmission in the presence of multiple eavesdroppers. While existing PHY...
Provided by University of Oslo
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White Papers
Comparing The Welfare Of Growing Economies
February 10, 2010, 12:00am PST
Economies that currently have the same productive capacity may implement different growth rates. This entails that it is insufficient to base international comparisons of welfare solely on current...
Provided by University of Oslo
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White Papers
Hierarchical Coalition Formation Game of Relay Transmission in IEEE 802.16m
February 6, 2011, 12:00am PST
One of the main features of IEEE 802.16m is the relay transmission which could not only extend the service coverage, but also improve the Quality-of-Service (QoS) to the mobile stations. In this...
Provided by University of Oslo
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White Papers
An Architecture for Adaptive Multimedia Streaming to Mobile Nodes
July 8, 2008, 12:00am PDT
The authors describe the ADIMUS architecture which addresses the problem of maintaining the subjective quality of multimedia streaming for a mobile user. In contrast to other works, the entire...
Provided by University of Oslo
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White Papers
Downlink Overhead Reduction for Multi-Cell Cooperative Processing Enabled Wireless Networks
June 18, 2008, 12:00am PDT
Multi-cell Cooperative Processing (MCP) has been recognised as an efficient technique for increasing spectral efficiency of future cellular systems. However, the provided benefits come at the cost...
Provided by University of Oslo
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White Papers
Deployed Wireless Sensors
January 19, 2010, 12:00am PST
The distribution of randomly deployed wireless sensors plays an important role in the quality of the methods used for data acquisition and signal reconstruction. Mathematically speaking, the...
Provided by University of Oslo
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White Papers
Efficient Cooperative Protocols for General Outage-Limited Multihop Wireless Networks
January 15, 2011, 12:00am PST
Due to the limited energy supplies of nodes in wireless networks, achieving energy efficiency is crucial for extending the lifetime of these networks. Thus, the authors study efficient power...
Provided by University of Oslo
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White Papers
Differential Space-Time Coded Cooperation for Decode-and-Forward Based Wireless Relay Networks
November 15, 2009, 12:00am PST
Estimating Channel State Information (CSI) in the fast fading conditions is very challenging. In this paper, a simple structure for cooperative diversity in decode-and-forward mode is examined, in...
Provided by University of Oslo
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White Papers
A Distributed Merge and Split Algorithm for Fair Cooperation in Wireless Networks
January 14, 2009, 12:00am PST
This paper introduces a novel concept from coalitional game theory which allows the dynamic formation of coalitions among wireless nodes. A simple and distributed merge and split algorithm for...
Provided by University of Oslo
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White Papers
A Distributed Coalition Formation Framework for Fair User Cooperation in Wireless Networks
January 13, 2010, 12:00am PST
Cooperation in wireless networks allows single antenna devices to improve their performance by forming virtual multiple antenna systems. However, performing a distributed and fair cooperation...
Provided by University of Oslo
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White Papers
Maximizing the Capacity of Wireless Networks Using Multi-Cell Access Schemes
January 1, 2011, 12:00am PST
The authors propose a novel method for improving wireless network capacity by resorting to a so-called "Multi-Cell Access" (MCA) scheme. An MCA scheme is reminiscent of the conventional multiple...
Provided by University of Oslo
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White Papers
Combining Space-Time Block Codes and Multiplexing in Correlated MIMO Channels: An Antenna Assignment Strategy
January 1, 2011, 12:00am PST
Multiplexing and space-time coding are competing ways of extracting capacity out of MIMO wireless systems. The authors address the problem of finding an optimal combination of these approaches...
Provided by University of Oslo
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White Papers
A Closed-Form Precoder for Spatial Multiplexing Over Correlated MIMO Channels
January 1, 2011, 12:00am PST
Multiple Input and Multiple Output (MIMO) systems, employing several transmit and receive antennas at both ends, are capable of providing a large increase in capacity compared to traditional...
Provided by University of Oslo
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White Papers
A Simple Greedy Scheme for Multicell Capacity Maximization
January 1, 2011, 12:00am PST
The authors study joint optimization of transmit power and scheduling in a multicell wireless network. Despite promising significant gains, this problem is known to be NP-hard and thus difficult...
Provided by University of Oslo
-
White Papers
Extending Orthogonal Block Codes With Partial Feedback
January 1, 2011, 12:00am PST
Since the work of Alamouti, Space-Time Block Coding (STBC) has been an intensive area of research, with several original design strategies having been put forward recently. Because of the decoding...
Provided by University of Oslo
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White Papers
Spatial Multiplexing Over Correlated MIMO Channels With a Closed Form Precoder
January 1, 2011, 12:00am PST
Multiple Input and Multiple Output (MIMO) systems, employing several transmit and receive antennas at both ends, are capable of providing a large increase in capacity compared to traditional...
Provided by University of Oslo
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White Papers
Using the Keystroke-Level Model to Evaluate Mobile Phones
June 19, 2008, 12:00am PDT
Developing applications and services for mobile devices can be a challenging task. One classic evaluation method available to desktop machines is the GOMS Keystroke-Level Model that measures the...
Provided by University of Oslo
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White Papers
802.11 WLAN MAC Layer Modeling
August 17, 2007, 12:00am PDT
In the standardized 802.11 protocol for Wireless Local Area Networks by the IEEE, an interesting and very useful model arises. This EO Markov Model incorporates as its primary Medium Access...
Provided by University of Oslo
-
White Papers
Power Allocations in Minimum-Energy SER Constrained Cooperative Networks
March 16, 2009, 12:00am PDT
In this paper, the authors propose minimum power allocation strategies for repetition-based Amplify-and-Forward (AF) relaying, given a required Symbol Error Rate (SER) at the destination. They...
Provided by University of Oslo
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White Papers
Dynamic Spectrum Allocation in Wireless Cognitive Sensor Networks: Improving Fairness and Energy Efficiency
May 20, 2008, 12:00am PDT
This paper considers the centralized spectrum allocations in resource-constrained wireless sensor networks with the following goals: allocate spectrum as fairly as possible, utilize spectrum...
Provided by University of Oslo
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White Papers
How Much Training is Needed Against Smart Jamming?
January 23, 2011, 12:00am PST
This paper studies training-based transmissions over Multiple-Input Multiple-Output (MIMO) fading channels in the presence of jamming. Each transmission block consists of a training phase and a...
Provided by University of Oslo
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White Papers
Two-Way Training Design for Discriminatory Channel Estimation in Wireless MIMO systems
February 9, 2011, 12:00am PST
This paper examines the use of two-way training in Multiple-Input Multiple-Output (MIMO) wireless systems to discriminate the channel estimation (and, thus, data detection) performance between two...
Provided by University of Oslo
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White Papers
5G - Service Continuity in Heterogeneous Environments
May 31, 2010, 12:00am PDT
This paper introduces service continuity as the main driver for 5G systems. It addresses user- and service-aspects in recently opened LTE networks, and identifies the system challenges. The main...
Provided by University of Oslo
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White Papers
Advanced SIM Capabilities Supporting Trust-Based Applications
June 2, 2009, 12:00am PDT
The SIM cards are going through several new enhancements both in the underlying hardware and its capabilities. They are becoming secure wireless networked devices containing embedded sensors. This...
Provided by University of Oslo
-
Whitepapers
The Nornir Run-Time System for Parallel Programs Using Kahn Process Networks
September 15, 2009, 12:00am PDT
Shared-memory concurrency is the prevalent paradigm used for developing parallel applications targeted towards small- and middle-sized machines, but experience has shown that it is hard to use....
Provided by University of Oslo
-
Whitepapers
Learning-Based Routing in Mobile Wireless Sensor Networks
January 15, 2012, 12:00am PST
Limited energy supply is a chief concern when dealing with Wireless Sensor Networks (WSNs). Thus, among other issues, routing protocols for WSNs should be designed with the goal of being energy...
Provided by University of Oslo
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White Papers
Amplify Based Double-Differential Modulation for Cooperative Communications
December 12, 2008, 12:00am PST
In this paper, the authors propose Double-Differential (DD) modulation for Amplify-And-Forward (AAF) cooperative communications system. The proposed system works very well in the presence of...
Provided by University of Oslo
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White Papers
The State-of-the-Art in Personalized Recommender Systems for Social Networking
April 28, 2011, 12:00am PDT
With the explosion of Web 2.0 application such as blogs, social and professional networks, and various other types of social media, the rich online information and various new sources of knowledge...
Provided by University of Oslo
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White Papers
Distributed Spectrum Sensing for Cognitive Radio Networks With Heterogeneous Traffic
September 15, 2010, 12:00am PDT
Cooperative spectrum sensing improves reliability and the detection performance of sensing. However, the fully cooperative scenario may not be realistic to assume in many cases. The authors...
Provided by University of Oslo
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White Papers
Distributed Spectrum Sensing in Cognitive Radio Networks With Fairness Consideration: Efficiency of Correlated Equilibrium
September 21, 2011, 12:00am PDT
Cooperative spectrum sensing improves the reliability of detection. However, if the secondary users are selfish, they may not collaborate for sensing. In order to address this problem, Medium...
Provided by University of Oslo
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White Papers
Formal Semantics and Analysis of Behavioral AADL Models in Real-Time Maude
February 2, 2010, 12:00am PST
AADL is a standard for modeling embedded systems that is widely used in avionics and other safety-critical applications. However, the AADL standard lacks at present a formal semantics, and this...
Provided by University of Oslo
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White Papers
Executable Interface Specifications for Testing Asynchronous Creol Components
July 14, 2008, 12:00am PDT
Creol is a high-level, object-oriented language for distributed systems, featuring active objects and asynchronous method calls. In this paper, the authors present a behavioral interface...
Provided by University of Oslo
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White Papers
Incremental Reasoning for Multiple Inheritance
June 5, 2009, 12:00am PDT
Object-orientation supports code reuse and incremental programming. Multiple inheritance increases the power of code reuse, but complicates the binding of method calls and thereby program...
Provided by University of Oslo
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White Papers
Lazy Behavioral Subtyping
November 19, 2007, 12:00am PST
Late binding allows flexible code reuse but complicates formal reasoning significantly, as a method call's receiver is not statically known. This is especially true when programs are incrementally...
Provided by University of Oslo
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White Papers
Abstract Interface Behavior of Object-Oriented Languages With Monitors
May 25, 2007, 12:00am PDT
The authors characterize the observable behavior of multi-threaded, object-oriented components with re-entrant monitors. They show that a compositional approach leads to observable uncertainty...
Provided by University of Oslo
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White Papers
Behavioral Interface Description of an Object-Oriented Language With Futures and Promises
October 12, 2007, 12:00am PDT
This paper formalizes the observable interface behavior of an concurrent, object-oriented language with futures and promises. The calculus captures the core of Creol, a language, featuring in...
Provided by University of Oslo
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White Papers
Strategies for Variability Transformation at Run-Time
May 20, 2009, 12:00am PDT
More and more approaches propose to use Software Product Lines (SPLs) modelling techniques to implement dynamic adaptive systems. The resulting Dynamic Software Product Lines (DSPLs) present new...
Provided by University of Oslo
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White Papers
A Model-Driven Approach to Develop Adaptive Firmwares
May 24, 2011, 12:00am PDT
In a near future it is expected that most things the people rely on in their everyday life will contain sensors and electronic based information, have computing power, run embedded software and...
Provided by University of Oslo
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White Papers
A Multi-Dimensional Framework for Characterizing Domain Specific Languages
October 1, 2007, 12:00am PDT
The paper presents a questionnaire to assess Domain Specific Languages based on a multi-dimensional framework for characterizing languages. An issue is whether and how to distinguish between...
Provided by University of Oslo
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White Papers
Optimal Design of Uniform Rectangular Antenna Arrays for Strong Line-of-Sight MIMO Channels
August 1, 2007, 12:00am PDT
The authors investigate the optimal design of Uniform Rectangular Arrays (URAs) employed in multiple-input multiple-output communications, where a strong Line-Of-Sight (LOS) component is present....
Provided by University of Oslo
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White Papers
Information Storage, Reduction and Dissemination in Sensor Networks: A Survey
April 7, 2010, 12:00am PDT
There is a large body of work addressing information storage, reduction, and dissemination in Wireless Sensor Networks (WSNs), but there seems to be no contribution giving a survey of this...
Provided by University of Oslo
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White Papers
Optimized Group Communication for Tactical Military Networks
August 13, 2010, 12:00am PDT
In tactical networks there is a need for group communication applications, such as position and information sharing (Situational Awareness data), and Push-To-Talk (PTT) voice communication. This...
Provided by University of Oslo
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White Papers
The Reliability Performance of Wireless Multi-Hop Networks With Apparent Link-Failures
August 19, 2010, 12:00am PDT
The links in an ad hoc or wireless mesh network are normally kept alive by the exchange of beacons between neighboring nodes. These beacons are prone to collisions with traffic from hidden nodes....
Provided by University of Oslo
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White Papers
Governing Third-Party Development Through Platform Boundary Resources
January 1, 2010, 12:00am PST
Third-party development is increasingly relevant for software platform owners seeking to generate complementary assets in the form of applications. The governance of such development involves two...
Provided by University of Oslo
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White Papers
A Network-Layer Proxy for Bandwidth Aggregation and Reduction of IP Packet Reordering
July 15, 2009, 12:00am PDT
With today's widespread deployment of wireless technologies, it is often the case that a single communication device can select from a variety of access networks. At the same time, there is an...
Provided by University of Oslo
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White Papers
Real Life Field Trial Over a Pre-Mobile WiMAX System With 4th Order Diversity
June 19, 2007, 12:00am PDT
Mobile WiMAX is a promising wireless technology approaching market deployment. Much discussion concentrate on whether mobile WiMAX will reach a tipping point and become 4G or not. As a pre-mobile...
Provided by University of Oslo
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White Papers
An Analysis of the Heterogeneity and IP Packet Reordering Over Multiple Wireless Networks
March 26, 2009, 12:00am PDT
With the increasing deployment of wireless technologies, such as WLAN, HSDPA, and WiMAX, it is often the case that simultaneous coverage of several access networks is available to a single user...
Provided by University of Oslo
-
White Papers
Advanced SIM Capabilities Supporting Trust-Based Applications
June 2, 2009, 12:00am PDT
The SIM cards are going through several new enhancements both in the underlying hardware and its capabilities. They are becoming secure wireless networked devices containing embedded sensors. This...
Provided by University of Oslo
-
White Papers
5G - Service Continuity in Heterogeneous Environments
May 31, 2010, 12:00am PDT
This paper introduces service continuity as the main driver for 5G systems. It addresses user- and service-aspects in recently opened LTE networks, and identifies the system challenges. The main...
Provided by University of Oslo
-
White Papers
Two-Way Training Design for Discriminatory Channel Estimation in Wireless MIMO systems
February 9, 2011, 12:00am PST
This paper examines the use of two-way training in Multiple-Input Multiple-Output (MIMO) wireless systems to discriminate the channel estimation (and, thus, data detection) performance between two...
Provided by University of Oslo
-
White Papers
How Much Training is Needed Against Smart Jamming?
January 23, 2011, 12:00am PST
This paper studies training-based transmissions over Multiple-Input Multiple-Output (MIMO) fading channels in the presence of jamming. Each transmission block consists of a training phase and a...
Provided by University of Oslo
-
White Papers
Dynamic Spectrum Allocation in Wireless Cognitive Sensor Networks: Improving Fairness and Energy Efficiency
May 20, 2008, 12:00am PDT
This paper considers the centralized spectrum allocations in resource-constrained wireless sensor networks with the following goals: allocate spectrum as fairly as possible, utilize spectrum...
Provided by University of Oslo
-
White Papers
Power Allocations in Minimum-Energy SER Constrained Cooperative Networks
March 16, 2009, 12:00am PDT
In this paper, the authors propose minimum power allocation strategies for repetition-based Amplify-and-Forward (AF) relaying, given a required Symbol Error Rate (SER) at the destination. They...
Provided by University of Oslo
-
White Papers
802.11 WLAN MAC Layer Modeling
August 17, 2007, 12:00am PDT
In the standardized 802.11 protocol for Wireless Local Area Networks by the IEEE, an interesting and very useful model arises. This EO Markov Model incorporates as its primary Medium Access...
Provided by University of Oslo
-
White Papers
Using the Keystroke-Level Model to Evaluate Mobile Phones
June 19, 2008, 12:00am PDT
Developing applications and services for mobile devices can be a challenging task. One classic evaluation method available to desktop machines is the GOMS Keystroke-Level Model that measures the...
Provided by University of Oslo
-
White Papers
Spatial Multiplexing Over Correlated MIMO Channels With a Closed Form Precoder
January 1, 2011, 12:00am PST
Multiple Input and Multiple Output (MIMO) systems, employing several transmit and receive antennas at both ends, are capable of providing a large increase in capacity compared to traditional...
Provided by University of Oslo
-
White Papers
Extending Orthogonal Block Codes With Partial Feedback
January 1, 2011, 12:00am PST
Since the work of Alamouti, Space-Time Block Coding (STBC) has been an intensive area of research, with several original design strategies having been put forward recently. Because of the decoding...
Provided by University of Oslo
-
White Papers
A Simple Greedy Scheme for Multicell Capacity Maximization
January 1, 2011, 12:00am PST
The authors study joint optimization of transmit power and scheduling in a multicell wireless network. Despite promising significant gains, this problem is known to be NP-hard and thus difficult...
Provided by University of Oslo
-
White Papers
A Closed-Form Precoder for Spatial Multiplexing Over Correlated MIMO Channels
January 1, 2011, 12:00am PST
Multiple Input and Multiple Output (MIMO) systems, employing several transmit and receive antennas at both ends, are capable of providing a large increase in capacity compared to traditional...
Provided by University of Oslo
-
White Papers
Combining Space-Time Block Codes and Multiplexing in Correlated MIMO Channels: An Antenna Assignment Strategy
January 1, 2011, 12:00am PST
Multiplexing and space-time coding are competing ways of extracting capacity out of MIMO wireless systems. The authors address the problem of finding an optimal combination of these approaches...
Provided by University of Oslo
-
White Papers
Maximizing the Capacity of Wireless Networks Using Multi-Cell Access Schemes
January 1, 2011, 12:00am PST
The authors propose a novel method for improving wireless network capacity by resorting to a so-called "Multi-Cell Access" (MCA) scheme. An MCA scheme is reminiscent of the conventional multiple...
Provided by University of Oslo
-
White Papers
A Distributed Coalition Formation Framework for Fair User Cooperation in Wireless Networks
January 13, 2010, 12:00am PST
Cooperation in wireless networks allows single antenna devices to improve their performance by forming virtual multiple antenna systems. However, performing a distributed and fair cooperation...
Provided by University of Oslo
-
White Papers
A Distributed Merge and Split Algorithm for Fair Cooperation in Wireless Networks
January 14, 2009, 12:00am PST
This paper introduces a novel concept from coalitional game theory which allows the dynamic formation of coalitions among wireless nodes. A simple and distributed merge and split algorithm for...
Provided by University of Oslo
-
White Papers
Differential Space-Time Coded Cooperation for Decode-and-Forward Based Wireless Relay Networks
November 15, 2009, 12:00am PST
Estimating Channel State Information (CSI) in the fast fading conditions is very challenging. In this paper, a simple structure for cooperative diversity in decode-and-forward mode is examined, in...
Provided by University of Oslo
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