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RWTH Aachen University
(84 results)-
White Papers
Can Cloud Computing Reach the TOP500?
March 5, 2009, 12:00am PST
Computing as a utility has reached the mainstream. Scientists can now rent time on large commercial clusters through several vendors. The cloud computing model provides flexible support for "Pay...
Provided by RWTH Aachen University
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White Papers
Enhancing IEEE 802.11a/n With Dynamic Single-User OFDM Adaptation
May 21, 2008, 12:00am PDT
Earlier paper have demonstrated that the achievable throughput of OFDM systems can benefit significantly from individual modulation/transmit power selection on a per sub-carrier basis according to...
Provided by RWTH Aachen University
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White Papers
Flexible Multi-Dimensional Visualization of Process Enactment Data
July 10, 2009, 12:00am PDT
The management of development processes is a challenging task and needs adequate tool support. In the course of a development project, many different engineering and management processes are...
Provided by RWTH Aachen University
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White Papers
Secure Roaming and Handover Procedures in Wireless Access Networks
January 1, 2010, 12:00am PST
A growing number of wireless technologies and providers, as well as users increasing need and desire to be connected and reachable at all times, call for solutions that enable interoperation...
Provided by RWTH Aachen University
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White Papers
Quantitative Design Space Exploration of Routing-Switches for Network-on-Chip
May 26, 2008, 12:00am PDT
Future Systems-on-Chip (SoC) will consist of many embedded functional units like e.g. embedded processor cores, memories or FPGA like structures. These SoCs will have huge communication demands,...
Provided by RWTH Aachen University
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White Papers
Demo Abstract: Spectrum Agile Medium Access Control Protocol for Wireless Sensor Networks
June 12, 2009, 12:00am PDT
In this demonstration paper the authors describe a low-power spectrum agile medium access control protocol for wireless sensor networks. The protocol allows sensor nodes to dynamically select an...
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White Papers
Poster Abstract: Traffic Aware Medium Access Control Protocol for Wireless Sensor Networks
February 15, 2008, 12:00am PST
Wireless Sensor Networks (WSNs) are characterized by various traffic loads of unicast, broadcast and multicast transmissions. The energy consumption behaviour relies heavily both on the load and...
Provided by RWTH Aachen University
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White Papers
Cross-Layer Design for Distributed Source Coding in Wireless Sensor Networks
May 21, 2008, 12:00am PDT
In this paper, the authors investigate the cross-layer design of Medium Access Control (MAC) protocols and Distributed Source Coding (DSC). They closely model the interaction between the source...
Provided by RWTH Aachen University
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White Papers
Parallel Processing of Data From Very Large-Scale Wireless Sensor Networks
July 1, 2010, 12:00am PDT
In this paper the authors explore the problems of storing and reasoning about data collected from very large-scale Wireless Sensor Networks (WSNs). Potential worldwide deployment of WSNs for,...
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White Papers
Optimizing Component-Oriented Systems: A Case Study in Wireless Sensor Networks
July 17, 2008, 12:00am PDT
In this demonstration the authors describe a systematic design process and a corresponding software system for automated planning, optimization and configuration of wireless net-works according to...
Provided by RWTH Aachen University
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White Papers
WSIM: A Software Platform to Simulate All-Optical Security Operations
October 18, 2008, 12:00am PDT
Network throughput rates increase every day in contrast to electronic chip processing speed and electronic I/O. Today's firewalls operate by using traditional electronic circuits just like any...
Provided by RWTH Aachen University
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White Papers
QMetric - A Metric Tool Suite for the Evaluation of Software Process Data
July 21, 2009, 12:00am PDT
Configuration and change request management systems offer valuable information for the assessment of process quality characteristics. The definition of appropriate metrics that address the...
Provided by RWTH Aachen University
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White Papers
Fair and Privacy-Preserving Multi-Party Protocols for Reconciling Ordered Input Sets
April 20, 2011, 12:00am PDT
In this paper, the authors introduce the first protocols for multi-party, privacy-preserving, fair reconciliation of ordered sets. The contributions are twofold. First, they show that it is...
Provided by RWTH Aachen University
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White Papers
Distributed Storage and Parallel Processing in Large-Scale Wireless Sensor Networks
July 1, 2010, 12:00am PDT
In this paper, the authors explore the problems of storing and reasoning about data collected from very large-scale Wireless Sensor Networks (WSNs). Potential worldwide deployment of WSNs for,...
Provided by RWTH Aachen University
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White Papers
Using Cognitive Radio Principles for Wireless Resource Management in Home Networking
October 1, 2010, 12:00am PDT
The demand for higher data rates, capacity and better quality-of-service is constantly growing for home networks. Therefore, there is a pressing need for efficient use of wireless network...
Provided by RWTH Aachen University
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White Papers
Spatial Statistics of Spectrum Usage: From Measurements to Spectrum Models
February 9, 2009, 12:00am PST
Several measurement studies have found a large amount of underutilized radio spectrum. More flexible regulation employing Dynamic Spectrum Access (DSA) has been proposed as solution to this...
Provided by RWTH Aachen University
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White Papers
Enabling Secondary Access Through Robust Primary User Channel Assignment
September 2, 2010, 12:00am PDT
A common concept to mitigate the effects of spectrum scarcity is to allow opportunistic Dynamic Spectrum Access (DSA) to licensed frequency bands. In this paper, the license holder may experience...
Provided by RWTH Aachen University
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White Papers
An Implementation of Cognitive Resource Management on LTE Platform
September 16, 2010, 12:00am PDT
In this paper, the authors describe an LTE based demonstrator of the Universal Link Layer API (ULLA) and Cognitive Resource Manager (CRM) modules that are developed in ARAGORN project. The...
Provided by RWTH Aachen University
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White Papers
Exploring Simulated Annealing and Graphical Models for Optimization in Cognitive Wireless Networks
August 14, 2009, 12:00am PDT
In this paper, the authors discuss the design of optimization algorithms for Cognitive Wireless Networks (CWNs). Maximizing the perceived network performance towards applications by selecting...
Provided by RWTH Aachen University
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White Papers
Modelling Primary System Activity in Dynamic Spectrum Access Networks by Aggregated ON/OFF-Processes
May 8, 2009, 12:00am PDT
Accurate modeling of primary system activity is key to reliable performance evaluation of Dynamic Spectrum Access (DSA) technologies. Measurements on spectrum use show that in some cases the...
Provided by RWTH Aachen University
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White Papers
A Common Application Requirement Interface for Cognitive Wireless Networks
June 18, 2009, 12:00am PDT
The authors discuss the design of a Common APplication Requirement Interface (CAPRI) for cognitive wireless networks. Applications can use CAPRI to express optimization goals and policies they...
Provided by RWTH Aachen University
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White Papers
Lessons Learned From an Extensive Spectrum Occupancy Measurement Campaign and a Stochastic Duty Cycle Model
January 29, 2009, 12:00am PST
Several measurement campaigns have shown that numerous spectrum bands are vacant although licenses have been issued by the regulatory agencies. Dynamic Spectrum Access (DSA) has been proposed in...
Provided by RWTH Aachen University
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White Papers
Measuring Complexity and Predictability in Networks With Multiscale Entropy Analysis
January 17, 2009, 12:00am PST
The authors propose to use multiscale entropy analysis in characterisation of network traffic and spectrum usage. They show that with such analysis one can quantify complexity and predictability...
Provided by RWTH Aachen University
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White Papers
Decomposition for Low-Complexity Near-Optimal Routing in Multi-Hop Wireless Networks
March 23, 2009, 12:00am PDT
Network flow models serve as a popular mathematical framework for the analysis and optimization of multi-hop wireless networks. They also serve to provide the understanding necessary to derive...
Provided by RWTH Aachen University
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White Papers
Evaluation of Cooperative Spectrum Sensing Based on Large Scale Measurements
August 19, 2008, 12:00am PDT
Dynamic spectrum access to unused licensed spectrum has been proposed as solution to the spectrum scarcity problem. Reliable detection of any primary user signal is crucial for the required...
Provided by RWTH Aachen University
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White Papers
Load Balancing for Dynamic Spectrum Assignment With Local Information for Secondary Users
August 22, 2008, 12:00am PDT
In this paper, the authors study an idealized model of load balancing for Dynamic Spectrum Allocation (DSA) for secondary users using only local information. In the model, each agent is assigned...
Provided by RWTH Aachen University
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White Papers
Characterization and Modelling of Spectrum for Dynamic Spectrum Access With Spatial Statistics and Random Fields
June 23, 2008, 12:00am PDT
There is a need to develop better models and characterization methods for spectrum usage and radio environments of cognitive radios. Currently, different theoretical and simulation based...
Provided by RWTH Aachen University
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White Papers
Effects of Topology on Local Throughput-Capacity of Ad Hoc Networks
June 23, 2008, 12:00am PDT
Most publications on the capacity and performance of wireless ad hoc networks share the underlying assumption of a uniform random distribution of nodes. In this paper, the authors study the...
Provided by RWTH Aachen University
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White Papers
Evaluation of Spectrum Occupancy Using Approximate and Multiscale Entropy Metrics
May 9, 2008, 12:00am PDT
In this paper, the authors apply approximate and multiscale entropy metrics to spectrum occupancy data gathered during an extensive measurement campaign. They show that the presented methods can...
Provided by RWTH Aachen University
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White Papers
Exploiting Spatial Statistics of Primary and Secondary Users Towards Improved Cognitive Radio Networks
March 23, 2008, 12:00am PDT
The authors show how locations of primary and secondary users of spectrum can be characterized quantitatively using modern spatial statistics techniques. They argue that several interesting...
Provided by RWTH Aachen University
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White Papers
Mobile Cloud Computing: A Comparison of Application Models
July 25, 2011, 12:00am PDT
Cloud computing is an emerging concept combining many fields of computing. The foundation of cloud computing is the delivery of services, software and processing capacity over the Internet,...
Provided by RWTH Aachen University
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Whitepapers
A Rendezvous Protocol with the Heterogeneous Spectrum Availability Analysis for Cognitive Radio Ad Hoc Networks
August 11, 2012, 12:00am PDT
In Cognitive Radio Ad Hoc Networks (CRANs) a frequently changing environment, licensed holders channel occupancy and heterogeneous spectrum availability result in a need of on-demand searching for...
Provided by RWTH Aachen University
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Whitepapers
Quorum Systems Towards an Asynchronous Communication in Cognitive Radio Networks
July 26, 2012, 12:00am PDT
This paper studies Quorum Systems (QS) and relevant properties, originally and widely used in the scope of operating systems and currently being applied in wireless communications. The objective...
Provided by RWTH Aachen University
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White Papers
Green Communications by Demand Shaping and User-in-the-Loop Tariff-Based Control
July 13, 2011, 12:00am PDT
The new field of green communications can be divided into energy-efficient communications equipment or using information and communication technology to improve the world to become more energy...
Provided by RWTH Aachen University
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White Papers
A Multi-Objective Approach for Data Collection in Wireless Sensor Networks
June 14, 2011, 12:00am PDT
Wireless Sensors Networks (WSNs) are deployed to collect huge amounts of data from the environment. This produced data has to be delivered through sensor's wireless interface using multi-hop...
Provided by RWTH Aachen University
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White Papers
Enabling Resource-Oriented Mobile Web Server for Short-Lived Services
December 13, 2009, 12:00am PST
Mobile Web Services (MobWSs) are a promising technology for the integration of Information Technology (IT) and TeleCommunication (TelCo) domains. The advancements in mobile communication and...
Provided by RWTH Aachen University
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White Papers
Multihop Wireless Channel Models Suitable for Stochastic Petri Nets and Markov State Analysis
February 10, 2011, 12:00am PST
In this paper the system analysis of modern wireless systems is simplified by providing simple yet powerful models for the wireless channel in the environment of higher layer abstract system...
Provided by RWTH Aachen University
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White Papers
Dynamic Multipath Onion Routing in Anonymous Peer-to-Peer Overlay Networks
August 8, 2007, 12:00am PDT
Although recent years provided many protocols for anonymous routing in overlay networks, they commonly rely on the same communication paradigm: onion routing. In Onion Routing a static tunnel...
Provided by RWTH Aachen University
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White Papers
Horizon - Exploiting Timing Information for Parallel Network Simulation
June 15, 2009, 12:00am PDT
Network simulation faces an increasing demand for highly detailed simulation models which in turn require efficient handling of their inherent computational complexity. This demand for detailed...
Provided by RWTH Aachen University
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White Papers
Expanding the Event Horizon in Parallelized Network Simulations
June 16, 2010, 12:00am PDT
The simulation models of wireless networks rapidly increase in complexity to accurately model wireless channel characteristics and the properties of advanced transmission technologies. Such...
Provided by RWTH Aachen University
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Whitepapers
Quorum Systems Towards an Asynchronous Communication in Cognitive Radio Networks
July 26, 2012, 12:00am PDT
This paper studies Quorum Systems (QS) and relevant properties, originally and widely used in the scope of operating systems and currently being applied in wireless communications. The objective...
Provided by RWTH Aachen University
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Whitepapers
A Rendezvous Protocol with the Heterogeneous Spectrum Availability Analysis for Cognitive Radio Ad Hoc Networks
August 11, 2012, 12:00am PDT
In Cognitive Radio Ad Hoc Networks (CRANs) a frequently changing environment, licensed holders channel occupancy and heterogeneous spectrum availability result in a need of on-demand searching for...
Provided by RWTH Aachen University
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Whitepapers
Torus Quorum System and Difference Set-Based Rendezvous in Cognitive Radio Ad Hoc Networks
June 20, 2012, 12:00am PDT
In Cognitive Radio Ad Hoc Networks (CRANs) a frequently changing environment and Primary Users channel occupancy result in a need of the searching for a common control channel by Secondary Users...
Provided by RWTH Aachen University
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Whitepapers
Dynamic TinyOS: Modular and Transparent Incremental Code-Updates for Sensor Networks
February 8, 2010, 12:00am PST
Long-term deployments of sensor networks in physically inaccessible environments make remote re-programmability of sensor nodes a necessity. Ranging from full image replacement to virtual...
Provided by RWTH Aachen University
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Whitepapers
Secure Resolution of End-Host Identifiers for Mobile Clients
April 5, 2011, 12:00am PDT
Many efforts of the network research community focus on the introduction of a new identifier to relieve the IP address from its dual role of end-host identifier and routable locator. This...
Provided by RWTH Aachen University
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Whitepapers
Performance of Scheduling Algorithms for HSDPA
July 18, 2007, 12:00am PDT
The High Speed Downlink Packet Access (HSDPA) is one of the newest extensions to the Universal Mobile Telecommunications System (UMTS). HSDPA allows for higher data rates due to new Adaptive...
Provided by RWTH Aachen University
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Whitepapers
Evaluation of Quality of Experience for Video Streaming Over Dynamic Spectrum Access Systems
April 20, 2010, 12:00am PDT
In this paper, the authors study the problem of quantifying the value of spectrum opportunities to secondary users in Dynamic Spectrum Access (DSA) systems. They especially focus on estimating the...
Provided by RWTH Aachen University
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Whitepapers
Low-Latency Linux Drivers for Ethernet Over High-Speed Networks
November 13, 2009, 12:00am PST
Now-a-days, high computing demands are often tackled by clusters of single computers, each of which is basically an assembly of a growing number of CPU cores and main memory, also called a node;...
Provided by RWTH Aachen University
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Whitepapers
A Case for Generic Interfaces in Cognitive Radio Networks
March 31, 2009, 12:00am PDT
Cognitive wireless networks are envisioned as a solution for intelligent ubiquitous networks that are capable of adapting to the dynamic environment through programmable radio devices. Each...
Provided by RWTH Aachen University
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Whitepapers
Enhancing Cognitive Radios With Spatial Statistics: From Radio Environment Maps to Topology Engine
May 10, 2009, 12:00am PDT
Radio environment maps are a promising architectural concept for storing environmental information for use in cognitive wireless networks. However, if not applied carefully their use can lead to...
Provided by RWTH Aachen University
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Whitepapers
Hackers in Your Pocket: A Survey of Smartphone Security Across Platforms
May 1, 2012, 12:00am PDT
In the past research on smart phone operating system security has been scattered over blog posts and other non-archival publications. Over the last 5 years with advent of Android, iOS and Windows...
Provided by RWTH Aachen University
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Whitepapers
The EIFFEL Approach Towards Visions for a Future Networked Society
July 6, 2009, 12:00am PDT
The Internet was not designed to be a critical part of the economy - but it has become exactly that. In fact, it has become a critical infrastructure for the overall society in developed...
Provided by RWTH Aachen University
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White Papers
Placing Regenerators in Optical Networks to Satisfy Multiple Sets of Requests
April 22, 2010, 12:00am PDT
The placement of regenerators in optical networks has become an active area of research during the last years. Given a set of light-paths in a network G and a positive integer d, regenerators must...
Provided by RWTH Aachen University
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White Papers
Dynamic Packet Scheduling in Wireless Networks
March 7, 2012, 12:00am PST
The authors consider protocols that serve communication requests arising over time in a wireless network that is subject to interference. Unlike previous approaches, they take the geometry of the...
Provided by RWTH Aachen University
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White Papers
Polytool: Polynomial Interpretations as a Basis for Termination Analysis of Logic Programs
December 22, 2009, 12:00am PST
The authors' goal is to study the feasibility of porting termination analysis techniques developed for one programming paradigm to another paradigm. In this paper, they show how to adapt...
Provided by RWTH Aachen University
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White Papers
Generalised Link-Layer Optimisation: Application and Performance Evaluation
January 4, 2012, 12:00am PST
A wireless communication system work more efficiently if link-layer parameters such as modulation order, symbol rate and packet size are (adaptively) optimised. A common criterion is to maximise...
Provided by RWTH Aachen University
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White Papers
Resource Allocation and Scheduling in FDD Multihop Cellular Systems
February 25, 2009, 12:00am PST
Cellular radio systems of the next generation aim to make the most out of the available radio resources in the dimensions bandwidth, time and space. The division of time into slots, frames and...
Provided by RWTH Aachen University
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White Papers
Security and Privacy Implications of URL Shortening Services
May 13, 2011, 12:00am PDT
URL shortening services replace long URLs with shorter ones and subsequently redirect all requests for the shortened URL to the original long URL. In this paper, the authors discuss and...
Provided by RWTH Aachen University
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White Papers
Towards Practical Attacker Classification for Risk Analysis in Anonymous Communication
November 16, 2009, 12:00am PST
There are a number of attacker models in the area of anonymous communication. Most of them are either very simplified or pretty abstract - therefore difficult to generalize or even identify in...
Provided by RWTH Aachen University
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White Papers
Using Trust to Resist Censorship in the Presence of Collusion
November 16, 2009, 12:00am PST
Censorship resistance deals with an attempt to prevent censors from the acquaintance and thus blocking of distribution of a particular content through the network. Providing resistance against...
Provided by RWTH Aachen University
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White Papers
Practical Anonymous Communication on the Mobile Internet Using Tor
September 11, 2007, 12:00am PDT
This paper proposes and evaluates several architectural designs for enabling anonymous browsing on the mobile Internet. These architectural designs make use of the Tor network in a mobile setting...
Provided by RWTH Aachen University
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White Papers
Crowds Revisited: Practically Effective Predecessor Attack
November 11, 2009, 12:00am PST
Crowds is a peer-to-peer system for protecting users' anonymity for web transactions. One of the more serious disadvantages of it is the degree of anonymity provided with respect to the colluding...
Provided by RWTH Aachen University
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White Papers
Performance Analysis of Anonymous Communication Channels Provided by Tor
December 28, 2007, 12:00am PST
Providing anonymity for end-users on the Internet is a very challenging and difficult task. There are currently only a few systems that are of practical relevance for the provision of low-latency...
Provided by RWTH Aachen University
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White Papers
A Kademlia-Based Node Lookup System for Anonymization Networks
February 1, 2009, 12:00am PST
Node lookup mechanisms constitute an integral part of any overlay network, and hence also of anonymous communication networks. Today, most anonymizers use centralized directories, which leads to...
Provided by RWTH Aachen University
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White Papers
Path Selection Metrics for Performance-Improved Onion Routing
April 30, 2009, 12:00am PDT
Providing anonymity for users on the Internet is a very challenging and difficult task. Currently there are only a few systems that are of practical relevance for the provision of low-latency...
Provided by RWTH Aachen University
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White Papers
SHALON: Lightweight Anonymization Based on Open Standards
March 6, 2009, 12:00am PST
In this paper, the authors introduce a novel lightweight anonymization technique called Shalon. It is based on onion routing, aims to reduce complexity, and delivers high bandwidth. They have,...
Provided by RWTH Aachen University
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White Papers
Privacy-Friendly Smart Environments
May 4, 2009, 12:00am PDT
In this paper, the authors describe their approach on protecting user privacy in smart environments, particularly smart homes, which they call eHomes. These are environments with devices such as...
Provided by RWTH Aachen University
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White Papers
Lightweight Hidden Services
September 28, 2011, 12:00am PDT
Hidden Services (HS) are mechanisms designed to provide network services while preserving anonymity for the identity of the server. Besides protecting the identity of the server, hidden services...
Provided by RWTH Aachen University
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White Papers
Introducing SOR: SSH-Based Onion Routing
January 5, 2012, 12:00am PST
Traditional low-latency anonymization techniques apply non-standardized, complex, and often even proprietary protocols. Apart from poor performance, the high development effort leads to the...
Provided by RWTH Aachen University
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White Papers
Clustering Players for Load Balancing in Virtual Worlds
February 16, 2008, 12:00am PST
Massively Multiplayer Online Games (MMOGs) have become increasingly popular in the last years. So far the distribution of load, caused by the players in these games, is not distributed...
Provided by RWTH Aachen University
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White Papers
Transfer Function Synthesis Without Quantifier Elimination
January 3, 2011, 12:00am PST
Recently it has been shown how transfer functions for linear template constraints can be derived for bit-vector programs by operating over propositional Boolean formulae. The drawback of this...
Provided by RWTH Aachen University
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White Papers
Impact of Primary User Activity Patterns on Spatial Spectrum Reuse Opportunities
February 28, 2010, 12:00am PST
Activity patterns of primary users have significant influence on the opportunities for secondary use of spectrum. In this paper, the authors explore this impact in terms of spatial spectrum reuse...
Provided by RWTH Aachen University
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White Papers
Transmit Power Control for Secondary Use in Environments With Correlated Shadowing
July 21, 2011, 12:00am PDT
In this paper, the authors propose a general model to estimate the maximum allowed transmit power of a secondary node based on the measured signal from the primary transmitter that is willing to...
Provided by RWTH Aachen University
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White Papers
Enabling Run-Time Utility-Based Optimization Through Generic Interfaces in Wireless Networks
September 4, 2011, 12:00am PDT
In this paper, the authors address the use of utility-based optimization in wireless networks. Their optimization approach is enabled by well-defined, technology- and platform-independent generic...
Provided by RWTH Aachen University
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White Papers
Femtocell Downlink Power Control Based on Radio Environment Maps
December 9, 2011, 12:00am PST
The paper investigates the use of Radio Environment Maps (REMs) as a tool for Interference Management (IM) in two-tier cellular networks comprising macro- and femto-cells. The REMs are databases...
Provided by RWTH Aachen University
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White Papers
Promoting Power to a First Class Metric in Network Simulations
January 19, 2010, 12:00am PST
Accurate prediction of energy consumption early in the design process is essential to efficiently optimize algorithms and protocols. However, despite energy efficiency gathering significant...
Provided by RWTH Aachen University
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White Papers
Implementing Frequency Selective Fading for OPNET's Wireless LAN Modules
June 22, 2008, 12:00am PDT
In OFDM-based IEEE 802.11 Wireless LANs, adapting the modulation type per sub-carrier to the frequency selectivity of the wireless channel leads to significant performance improvements. To...
Provided by RWTH Aachen University
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White Papers
Cognitive Radio for Home Networking
February 2, 2010, 12:00am PST
Cognitive Radios have emerged as one of the most promising methods to increase wireless system efficiency through dynamic spectrum access combined with cross-layer optimization methods. Most of...
Provided by RWTH Aachen University
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White Papers
Location-Based Adaptive Detection Threshold for Dynamic Spectrum Access
February 1, 2010, 12:00am PST
In this paper, the authors propose a heuristic algorithm that exploits additional information, such as related to geo-location and frequency allocation, that can be in general known by a secondary...
Provided by RWTH Aachen University
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White Papers
Practical Distributed Channel Selection Protocol for Single-Hop Transmissions in Cognitive Radio Ad Hoc Networks
June 30, 2009, 12:00am PDT
In this paper, the authors propose a practical distributed channel selection protocol for cognitive radio ad hoc networks considering single hop transmission. The proposed protocol uses the...
Provided by RWTH Aachen University
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