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Karlsruhe Institute of Technology (KIT)
(143 results)-
Whitepapers
Increasing the One-Hop Progress of Nearest Neighbor Forwarding
May 21, 2012, 12:00am PDT
Wireless networks have recently gained much attraction due to several reasons: research on hardware has achieved considerable advances in the development of small and inexpensive communications...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Lowering Outage Probability in Ad Hoc Networks by Nearest Neighbor FDMA Scheduling
January 10, 2011, 12:00am PST
This paper investigates the performance of a wireless ad hoc network capable of dynamically coordinating a set of orthogonal frequency channels such that every receiver and its nearest interferer...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Components for Software Radio Wideband Receivers: A Space Segment Survey
October 1, 2010, 12:00am PDT
Many interesting scenarios are emerging on the horizon of satellite communication: communication system flexibility is a keyword for revenue enhancement and Software Defined Radio (SDR) is a means...
Provided by Karlsruhe Institute of Technology
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Whitepapers
A Note on Local Receive Channel Scheduling versus Transmit Channel Scheduling in Wireless Multi-Channel Ad Hoc Networks
October 27, 2010, 12:00am PDT
A wireless ad hoc network consists of a collection of nodes communicating without a-priori known traffic pattern. In contrast to cellular networks, nodes in an ad hoc network must organize network...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Combination of Centralized & Decentralized Database and Terminal-Based Spectrum Sensing for Secondary Spectrum Access
April 28, 2010, 12:00am PDT
Since, the original Cognitive Radio (CR) concept had emerged, the opportunistic usage of selected frequency bands has become one of the most promising application scenarios from the perspective of...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Incremental Relaying With Imperfect Feedback in Wireless Cooperative Networks
February 26, 2010, 12:00am PST
The authors present the â?¬-outage capacity in the low Signal-to-Noise Ratio (SNR) regime of an incremental relaying network. The network consists of one source, one destination, and two...
Provided by Karlsruhe Institute of Technology
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Whitepapers
On the Frame Design for Joint OFDM Radar and Communications
July 16, 2010, 12:00am PDT
The authors discuss how to design OFDM signals which are suitable for both radar and communications using high-bandwidth OFDM signals. A list of constraints which the signal configuration must...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Signal Design and Coding for High-Bandwidth OFDM in Car-to-Car Communication
June 1, 2010, 12:00am PDT
The authors analyze mobile propagation channels which occur in the context of car-to-car communications in the 24 GHz ISM band. From the information gathered, they design robust frame designs for...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Wireless Networks In-the-Loop: Software Radio as the Enabler
October 16, 2009, 12:00am PDT
A software architecture to rapidly develop and test radio networks in real and physical environments is proposed. Radio network terminals are developed in software and run on generic hardware to...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Maximum Likelihood Speed and Distance Estimation for OFDM Radar
January 27, 2010, 12:00am PST
A distance and speed estimation algorithm for OFDM based radar is analyzed statistically. The maximum likelihood estimator is derived and compared to previous results. A connection to spectral...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Wideband Receiver for a Spaceborne Software Radio Application
February 1, 2010, 12:00am PST
Software Defined Radio (SDR), thanks to the recent technological advancements, has become one of the valuable solutions to achieve flexibility in a regenerative communication payload on board the...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Wireless Networks In-the-Loop: Emulating an RF Front-End in GNU
May 6, 2010, 12:00am PDT
The objective of this paper is to emulate the behavior of the Universal Software Radio Peripheral as an example of an RF front-end hardware for software radios. The model includes digital and...
Provided by Karlsruhe Institute of Technology
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Whitepapers
A Simple Stochastic Channel Simulator for Car-to-Car Communication at 24 GHz
March 1, 2010, 12:00am PST
A channel model, based on stochastics and Ray tracing, is described for a communication system, in which moving participants communicate in the 24 GHz band. A realistic behaviour of propagation...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Software Defined Radio in Public and Governmental Security Systems
November 3, 2009, 12:00am PST
Radio communication is crucial for Public and Governmental Security (P&GS) systems. No matter if a police officer waits for a radio message to get to his next scene or a firefighter needs to...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Outage Regions and Optimal Power Allocation for Wireless Relay Networks
August 7, 2009, 12:00am PDT
The authors study outage regions for energy-constrained multi-hop and adaptive multi-route networks with an arbitrary number of relay nodes. Optimal power allocation strategies in the sense that...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Outage Capacity of Incremental Relaying for Low Signal-to-Noise Ratios
August 6, 2009, 12:00am PDT
The authors present the Ç«-outage capacity of incremental relaying at low Signal-to-Noise Ratios (SNR) in a wireless cooperative network with slow Rayleigh fading channels. The relay performs...
Provided by Karlsruhe Institute of Technology
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Whitepapers
A Novel Combining Receiver for a Dual-Diversity Wireless Relay Network
July 17, 2009, 12:00am PDT
The authors present a simple combining receiver for a dual-diversity wireless relay network. The main concern of the paper is to face the trade-off between performance and complexity. The receiver...
Provided by Karlsruhe Institute of Technology
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Whitepapers
On Linearly Precompressed Non-Parametric Spectrum Estimation
September 9, 2009, 12:00am PDT
Extending the derivation of a maximum likelihood spectrum estimator by Stoica and Sundin, non-parametric spectrum estimation with linear pre-compression is introduced. For real-time applications,...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Parametrization of Joint OFDM-Based Radar and Communication Systems for Vehicular Applications
August 4, 2009, 12:00am PDT
The design process of a joint radar and communication system employing OFDM is analyzed. In particular, the question on how to choose OFDM modulation parameters such as carrier distance, guard...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Compressed Spectrum Estimation for Cognitive Radios
April 20, 2009, 12:00am PDT
Cognitive Radios observe the spectral environment through spectrum estimation. In particular, reconfigurable Software Defined Radio architectures generate large amounts of sample data, which can...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Centralized Modeling of the Communication Space for Spectral Awareness in Cognitive Radio Networks
September 25, 2009, 12:00am PDT
The communication space is five dimensional: its degrees of freedom are frequency, time and space. The use of the electromagnetic spectrum depends on these parameters. With future applications...
Provided by Karlsruhe Institute of Technology
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Whitepapers
A Low Complex and Efficient Coexistence Approach for Non-Coherent Multiband Impulse Radio UWB
February 18, 2009, 12:00am PST
When bringing a high data rate multiband impulse radio UWB system to the market it has to coexist with other already existing UWB technologies such as multiband OFDM UWB. This paper analyzes the...
Provided by Karlsruhe Institute of Technology
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Whitepapers
Upper and Lower Bound on Signal-to-Noise Ratio Gains for Cooperative Relay Networks
March 23, 2009, 12:00am PDT
The randomness of the wireless channel leads to time-variant fluctuations of the received signal amplitude. This adverse effect of fading can be mitigated by diversity techniques. The creation of...
Provided by Karlsruhe Institute of Technology
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White Papers
Considering Capacities in Application-Layer Multicast Over Shared Access Networks
June 11, 2010, 12:00am PDT
A huge number of application scenarios would greatly benefit from a group communication service in the Internet, but the existing IP Multicast solution still lacks global availability due to...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Energy-Efficient Management of Wireless Sensor Networks
December 7, 2009, 12:00am PST
Managing wireless sensor networks in an energy-efficient manner is no mean feat. Management requests and responses create additional traffic in addition to the data issuing from the network's...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
DFN@100G : A Field Trial of 100G Technologies Related to Real World Research Scenarios
April 15, 2011, 12:00am PDT
In general, it can be summarized that the 100G trial infrastructure showed a very stable behaviour during the whole duration of the test. Even high interface load did not show an increased error...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Development and Application of GPS-Based Time Synchronization in Power Line Channel Time Characterization
September 23, 2011, 12:00am PDT
Research activities in PLC area such as measurements of time-varying channel features and evaluations of communication synchronization methodologies require a precise and stable global time...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Formal Semantics for the Java Modeling Language
January 13, 2011, 12:00am PST
A common critique of formal methods in software development practise is, that they are not readily understandable and thus not widely used. The Java Modeling Language (JML) was created in an...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
QPME a Performance Modeling Tool Based on Queueing Petri Nets
November 11, 2008, 12:00am PST
Queueing Petri nets are a powerful formalism that can be exploited for modeling distributed systems and analyzing their performance and scalability. By combining the modeling power and...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Challenges and Opportunities of Cloud Computing
October 21, 2010, 12:00am PDT
In recent years, Cloud Computing has become an emerging technology that gains wide influence on IT systems. Cloud Computing is a distributed computing model for enabling service-oriented,...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
On the Accuracy of Software-Based Energy Estimation Techniques
December 12, 2010, 12:00am PST
This paper examines the accuracy of software-based on-line energy estimation techniques. It evaluates today's most widespread energy estimation model in order to investigate whether the current...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Analysis of the Performance-Influencing Factors of Virtualization Platforms
January 12, 2011, 12:00am PST
Nowadays, virtualization solutions are gaining increasing importance. By enabling the sharing of physical resources, thus making resource usage more efficient, they promise energy and cost...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Evaluating and Modeling Virtualization Performance Overhead for Cloud Environments
February 7, 2011, 12:00am PST
Due to trends like Cloud Computing and Green IT, virtualization technologies are gaining increasing importance. They promise energy and cost savings by sharing physical resources, thus making...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Cloud Computing: New Business Opportunities for Telecommunications Companies?
September 1, 2010, 12:00am PDT
Cloud computing has recently shifted into the center of attention of Telecommunications Companies. Deutsche Telekom, for example, just announced the importance of cloud computing as one of their...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
On the Transmission Capacity of Wireless Multi-Channel Ad Hoc Networks With Local FDMA Scheduling
October 27, 2010, 12:00am PDT
The problem of the capacity of multi-channel interference-limited ad hoc networks with local frequency planning is examined in the transmission capacity framework. Bounds on outage and...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Energy Efficient Scheduling With Power Control for Wireless Networks
July 1, 2010, 12:00am PDT
Scheduling of transmissions is one of the most fundamental problems in the context of wireless networks. In this paper, the authors consider the problem of computing power efficient schedules with...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Cloud Services From a Consumer Perspective
August 15, 2010, 12:00am PDT
Although there is an increased attention on Cloud Computing in the academic literature in the recent years, most research work focus on technical aspects of cloud computing. Research on consumers'...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
A Generative Model for 3D Urban Scene Understanding From Movable Platforms
April 4, 2011, 12:00am PDT
3D scene understanding is key for the success of applications such as autonomous driving and robot navigation. However, existing approaches produce a mild level of understanding, e.g.,...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Scalable Distributed-Memory External Sorting
October 14, 2009, 12:00am PDT
The authors engineer algorithms for sorting huge data sets on massively parallel machines. The algorithms are based on the multiway merging paradigm. They first outline an algorithm whose I/O...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Completeness Theorems With Constructive Proofs for Finite Deterministic 2-Party Functions (full Version)
April 4, 2011, 12:00am PDT
In this paper the authors present simple but comprehensive combinatorial criteria for completeness of finite deterministic 2-party functions with respect to information-theoretic security. They...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Engineering Multilevel Graph Partitioning Algorithms
April 4, 2011, 12:00am PDT
The authors present a multi-level graph partitioning algorithm using novel local improvement algorithms and global search strategies transferred from multigrid linear solvers. Local improvement...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Combined Data Structure for Previous-And Next-Smaller-Values
February 2, 2011, 12:00am PST
The authors consider the situation where a static array A[1, n] can be preprocessed such that the following three queries can be answered in constant time: previous- and...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Studienarbeit Parallel Highway-Node Routing
January 15, 2008, 12:00am PST
Highway-Node Routing is a scheme for solving the shortest path problem showing excellent speedups over Dijkstra's algorithm. There also is a dynamic variant that allows changes to the cost...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Grid Virtualization Engine: Design, Implementation and Evaluation
October 14, 2009, 12:00am PDT
Virtual machines offer various advantages such as easy configuration, management, development and deployment of computing resources for cyberinfrastructures. Recent advances of employing virtual...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
Technical Report: Secure Cloud Computing Through a Separation of Duties
May 18, 2010, 12:00am PDT
Cloud Computing offers many opportunities but also introduces new risks. A user who outsources a database into the Cloud loses control over his data. While the data can be secured against external...
Provided by Karlsruhe Institute of Technology (KIT)
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White Papers
The Ricommander - Rating Recommendations for Corporate Community Portals
March 10, 2010, 12:00am PST
This paper points at the large potentials that corporate community portals can have to support the business model of companies. In particular corporate community portals of the next generation are...
Provided by Karlsruhe Institute of Technology (KIT)
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