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Jacobs University Bremen
(27 results)-
White Papers
Spreadsheet Interaction With Frames: Exploring a Mathematical Practice
May 22, 2009, 12:00am PDT
Since Mathematics really is about what mathematicians do, this paper will look at the mathematical practice of framing, in which an object of interest is viewed in terms of well-understood...
Provided by Jacobs University Bremen
-
White Papers
Design of Learning Based MIMO Cognitive Radio Systems
May 10, 2009, 12:00am PDT
This paper addresses the design issues of the multi-antenna-based Cognitive Radio (CR) system that is able to operate concurrently with the licensed Primary Radio (PR) system. The authors propose...
Provided by Jacobs University Bremen
-
Whitepapers
A General Framework for Optimizing AF Based Multi-Relay OFDM Systems
May 24, 2012, 12:00am PDT
In this paper, the authors study the joint resource allocation problem in multi-carrier multi-relay aided dual hop single-user communication. They adopt Orthogonal Frequency Division Multiplexing...
Provided by Jacobs University Bremen
-
Whitepapers
Improved Error Localization in DSL Systems Based on the Common Mode
May 24, 2012, 12:00am PDT
The authors propose a scheme to improve system performance in Discrete MultiTone systems, which combines the joint differential and common mode processing at the receiver side with erasure...
Provided by Jacobs University Bremen
-
White Papers
Power Control and Interference Awareness Using Busy Bursts
June 9, 2009, 12:00am PDT
This paper presents the integration of power control and the Busy Burst (BB) technique for a TDD OFDMA (Time Division Duplex Orthogonal Frequency Division Multiple Access) system in an urban...
Provided by Jacobs University Bremen
-
White Papers
Local Information Busy Burst Thresholding
February 27, 2009, 12:00am PST
This paper presents a novel approach for setting the thresholds for Busy Burst (BB) enabled interference avoidance in TDD (Time Division Duplex) systems. One of the key issues in the BB concept is...
Provided by Jacobs University Bremen
-
White Papers
Spatial Reuse and Random Data Hopping in Multihop Ad Hoc Networks
October 15, 2007, 12:00am PDT
Spatial reuse TDMA (Time Division Multiple Access) in multihop ad hoc network is a subject of intense research interest for next generation wireless systems. In this paper, the selection of...
Provided by Jacobs University Bremen
-
White Papers
Analysis of Fusion and Combining for wireless Source Detection
February 2, 2009, 12:00am PST
In wireless detection scenarios such as sensor networks or cognitive radio, "Hidden nodes" can occur due to channel fading, which can be overcome by collaborative sensing. This paper considers the...
Provided by Jacobs University Bremen
-
White Papers
A Novel Correlation Sum Method for Cognitive Radio Spectrum Sensing
February 14, 2008, 12:00am PST
Cognitive radio is a promising concept for coping with the spectrum scarcity in future generation wireless communication networks. This idea, including Software-Defined Radio (SDR) as the enabling...
Provided by Jacobs University Bremen
-
White Papers
The Accuracy of Tensor and Directional Methods for MIMO Channel Modeling
July 22, 2007, 12:00am PDT
The goal of this paper is to identify MIMO modeling strategies with high accuracy and relatively few parameters. Candidates are existing correlation tensor models (Kronecker, Weichselberger, and...
Provided by Jacobs University Bremen
-
White Papers
Green's Function Models and Measurements for Body Area Network (BAN) Channels
April 2, 2010, 12:00am PDT
In wireless Body Area Networks (BANs), communicating nodes are present near, directly on, or inside the body. Designing high-performance BAN systems is challenging due to competing goals of high...
Provided by Jacobs University Bremen
-
White Papers
Measured Statistics of Reciprocal Channel Key Generation of Indoor MIMO Channels
January 15, 2010, 12:00am PST
There is growing interest in physical-layer security methods that exploit the random nature of the physical propagation channel to strengthen existing crypto-systems. In Reciprocal Channel Key...
Provided by Jacobs University Bremen
-
White Papers
Investigation of Complexity-Constrained Peformance of Planar REConfigurable APerture Antennas (RECAPs)
January 16, 2010, 12:00am PST
A REConfigurable APerture (RECAP) antenna is a regular array of reconfigurable elements whose state can be changed dynamically. RECAPs have shown the potential to support many antenna operations...
Provided by Jacobs University Bremen
-
White Papers
Experimental Investigation of MIMO Reciprocal Channel Key Generation
February 10, 2010, 12:00am PST
There is growing interest in physical-layer key generation schemes that provide very strong or even perfect security in wireless communication systems. One such scheme is reciprocal channel key...
Provided by Jacobs University Bremen
-
White Papers
Exploring Beamforming Performance Versus Complexity in Reconfigurable Aperture Antennas
February 3, 2010, 12:00am PST
REConfigurable APerture (RECAP) antennas consist of a regular array of reconfigurable elements confined to an aperture, representing a generalization of the reconfigurable antenna concept. RECAPs...
Provided by Jacobs University Bremen
-
White Papers
Improved Autocorrelation-Based Sensing Using Correlation Distribution Information
February 2, 2010, 12:00am PST
Accurate and efficient spectrum sensing is a critical component of cognitive radio, which is a technology poised to improve dynamic resource management in future wireless networks. Autocorrelation...
Provided by Jacobs University Bremen
-
White Papers
Secure Physical Layer Key Generation Schemes: Performance and Information Theoretic Limits
October 31, 2008, 12:00am PDT
There is growing interest in wireless security methods that provide strong or even perfect secrecy by taking advantage of features of the physical propagation channel. In advantage-based methods,...
Provided by Jacobs University Bremen
-
White Papers
Indoor Shadowing Correlation Measurements for Cognitive Radio Studies
January 30, 2009, 12:00am PST
Cognitive radio is a potential technology for increasing spectral efficiency in wireless communications systems, where in a hypothetical future overlay policy, secondary cognitive radios...
Provided by Jacobs University Bremen
-
White Papers
Ultra-Wideband Sensing of Speech Production
January 29, 2009, 12:00am PST
Ultra-WideBand (UWB) technology has been identified as an attractive solution for certain biomedical sensing applications due to its safety, no requirement of physical contact, real-time...
Provided by Jacobs University Bremen
-
White Papers
Improved Spectrum Sensing by Utilizing Signal Autocorrelation
January 22, 2009, 12:00am PST
A method that exploits the autocorrelation of transmission signals for primary user detection in cognitive radio is proposed. A closed-form analysis of the method is presented and compared with...
Provided by Jacobs University Bremen
-
White Papers
Key Generation Exploiting MIMO Channel Evolution: Algorithms and Theoretical Limits
January 2, 2009, 12:00am PST
An emerging area of research in wireless communications is the generation of secret encryption keys based on the shared (or common) randomness of the wireless channel between two legitimate nodes...
Provided by Jacobs University Bremen
-
White Papers
Experimental Characterization of Indoor Multiuser Shadowing for Collaborative Cognitive Radio
January 12, 2009, 12:00am PST
Cross-correlation of multiuser shadowing in an indoor environment at 2.55 GHz is presented, indicating that shadowing is mostly uncorrelated after 2-4 m in the indoor environment. Similar...
Provided by Jacobs University Bremen
-
White Papers
Non-Separable Directional Channel Model and Observations for Future Mobile Air Interfaces
February 1, 2008, 12:00am PST
Communication nodes with multiple antennas are likely candidates for 4th Generation (4G) wireless systems and beyond, providing increased spectral efficiency as well as improved spectrum reuse....
Provided by Jacobs University Bremen
-
White Papers
Directional Channel Modeling With Sparse Power Azimuth Spectrum Estimation
February 1, 2008, 12:00am PST
For directional wireless channel modeling, a number of techniques exist to estimate the Power Azimuth Spectrum (PAS) from multiple-antenna measurements. Beamforming is a typical method to estimate...
Provided by Jacobs University Bremen
-
White Papers
A Joint Resource Allocation Scheme for Multiuser Two-Way Relay Networks
May 23, 2011, 12:00am PDT
In this paper, the authors study the problem of resource allocation in Amplify-and-Forward (AF) based multiuser two-way relay network that is operated under Orthogonal Frequency Division Multiple...
Provided by Jacobs University Bremen
-
White Papers
Dimensions of Formality: A Case Study for MKM in Software Engineering
April 29, 2010, 12:00am PDT
The authors study the formalization of a collection of documents created for a Software Engineering project from an MKM perspective. They analyze how document and collection markup formats can...
Provided by Jacobs University Bremen
-
White Papers
A Comparative Analysis of Array Models for Databases
March 1, 2012, 12:00am PST
While the database collection types set, list, and record have received in-depth attention, the fourth type, array, is still far from being integrated into database modeling. Due to this lack of...
Provided by Jacobs University Bremen
-
Whitepapers
Improved Error Localization in DSL Systems Based on the Common Mode
May 24, 2012, 12:00am PDT
The authors propose a scheme to improve system performance in Discrete MultiTone systems, which combines the joint differential and common mode processing at the receiver side with erasure...
Provided by Jacobs University Bremen
-
Whitepapers
A General Framework for Optimizing AF Based Multi-Relay OFDM Systems
May 24, 2012, 12:00am PDT
In this paper, the authors study the joint resource allocation problem in multi-carrier multi-relay aided dual hop single-user communication. They adopt Orthogonal Frequency Division Multiplexing...
Provided by Jacobs University Bremen
-
White Papers
A Comparative Analysis of Array Models for Databases
March 1, 2012, 12:00am PST
While the database collection types set, list, and record have received in-depth attention, the fourth type, array, is still far from being integrated into database modeling. Due to this lack of...
Provided by Jacobs University Bremen
-
White Papers
Dimensions of Formality: A Case Study for MKM in Software Engineering
April 29, 2010, 12:00am PDT
The authors study the formalization of a collection of documents created for a Software Engineering project from an MKM perspective. They analyze how document and collection markup formats can...
Provided by Jacobs University Bremen
-
White Papers
A Joint Resource Allocation Scheme for Multiuser Two-Way Relay Networks
May 23, 2011, 12:00am PDT
In this paper, the authors study the problem of resource allocation in Amplify-and-Forward (AF) based multiuser two-way relay network that is operated under Orthogonal Frequency Division Multiple...
Provided by Jacobs University Bremen
-
White Papers
Directional Channel Modeling With Sparse Power Azimuth Spectrum Estimation
February 1, 2008, 12:00am PST
For directional wireless channel modeling, a number of techniques exist to estimate the Power Azimuth Spectrum (PAS) from multiple-antenna measurements. Beamforming is a typical method to estimate...
Provided by Jacobs University Bremen
-
White Papers
Non-Separable Directional Channel Model and Observations for Future Mobile Air Interfaces
February 1, 2008, 12:00am PST
Communication nodes with multiple antennas are likely candidates for 4th Generation (4G) wireless systems and beyond, providing increased spectral efficiency as well as improved spectrum reuse....
Provided by Jacobs University Bremen
-
White Papers
Experimental Characterization of Indoor Multiuser Shadowing for Collaborative Cognitive Radio
January 12, 2009, 12:00am PST
Cross-correlation of multiuser shadowing in an indoor environment at 2.55 GHz is presented, indicating that shadowing is mostly uncorrelated after 2-4 m in the indoor environment. Similar...
Provided by Jacobs University Bremen
-
White Papers
Key Generation Exploiting MIMO Channel Evolution: Algorithms and Theoretical Limits
January 2, 2009, 12:00am PST
An emerging area of research in wireless communications is the generation of secret encryption keys based on the shared (or common) randomness of the wireless channel between two legitimate nodes...
Provided by Jacobs University Bremen
-
White Papers
Improved Spectrum Sensing by Utilizing Signal Autocorrelation
January 22, 2009, 12:00am PST
A method that exploits the autocorrelation of transmission signals for primary user detection in cognitive radio is proposed. A closed-form analysis of the method is presented and compared with...
Provided by Jacobs University Bremen
-
White Papers
Ultra-Wideband Sensing of Speech Production
January 29, 2009, 12:00am PST
Ultra-WideBand (UWB) technology has been identified as an attractive solution for certain biomedical sensing applications due to its safety, no requirement of physical contact, real-time...
Provided by Jacobs University Bremen
-
White Papers
Indoor Shadowing Correlation Measurements for Cognitive Radio Studies
January 30, 2009, 12:00am PST
Cognitive radio is a potential technology for increasing spectral efficiency in wireless communications systems, where in a hypothetical future overlay policy, secondary cognitive radios...
Provided by Jacobs University Bremen
-
White Papers
Secure Physical Layer Key Generation Schemes: Performance and Information Theoretic Limits
October 31, 2008, 12:00am PDT
There is growing interest in wireless security methods that provide strong or even perfect secrecy by taking advantage of features of the physical propagation channel. In advantage-based methods,...
Provided by Jacobs University Bremen
-
White Papers
Improved Autocorrelation-Based Sensing Using Correlation Distribution Information
February 2, 2010, 12:00am PST
Accurate and efficient spectrum sensing is a critical component of cognitive radio, which is a technology poised to improve dynamic resource management in future wireless networks. Autocorrelation...
Provided by Jacobs University Bremen
-
White Papers
Exploring Beamforming Performance Versus Complexity in Reconfigurable Aperture Antennas
February 3, 2010, 12:00am PST
REConfigurable APerture (RECAP) antennas consist of a regular array of reconfigurable elements confined to an aperture, representing a generalization of the reconfigurable antenna concept. RECAPs...
Provided by Jacobs University Bremen
-
White Papers
Experimental Investigation of MIMO Reciprocal Channel Key Generation
February 10, 2010, 12:00am PST
There is growing interest in physical-layer key generation schemes that provide very strong or even perfect security in wireless communication systems. One such scheme is reciprocal channel key...
Provided by Jacobs University Bremen
-
White Papers
Investigation of Complexity-Constrained Peformance of Planar REConfigurable APerture Antennas (RECAPs)
January 16, 2010, 12:00am PST
A REConfigurable APerture (RECAP) antenna is a regular array of reconfigurable elements whose state can be changed dynamically. RECAPs have shown the potential to support many antenna operations...
Provided by Jacobs University Bremen
-
White Papers
Measured Statistics of Reciprocal Channel Key Generation of Indoor MIMO Channels
January 15, 2010, 12:00am PST
There is growing interest in physical-layer security methods that exploit the random nature of the physical propagation channel to strengthen existing crypto-systems. In Reciprocal Channel Key...
Provided by Jacobs University Bremen
-
White Papers
Green's Function Models and Measurements for Body Area Network (BAN) Channels
April 2, 2010, 12:00am PDT
In wireless Body Area Networks (BANs), communicating nodes are present near, directly on, or inside the body. Designing high-performance BAN systems is challenging due to competing goals of high...
Provided by Jacobs University Bremen
-
White Papers
The Accuracy of Tensor and Directional Methods for MIMO Channel Modeling
July 22, 2007, 12:00am PDT
The goal of this paper is to identify MIMO modeling strategies with high accuracy and relatively few parameters. Candidates are existing correlation tensor models (Kronecker, Weichselberger, and...
Provided by Jacobs University Bremen
-
White Papers
A Novel Correlation Sum Method for Cognitive Radio Spectrum Sensing
February 14, 2008, 12:00am PST
Cognitive radio is a promising concept for coping with the spectrum scarcity in future generation wireless communication networks. This idea, including Software-Defined Radio (SDR) as the enabling...
Provided by Jacobs University Bremen
-
White Papers
Analysis of Fusion and Combining for wireless Source Detection
February 2, 2009, 12:00am PST
In wireless detection scenarios such as sensor networks or cognitive radio, "Hidden nodes" can occur due to channel fading, which can be overcome by collaborative sensing. This paper considers the...
Provided by Jacobs University Bremen
-
White Papers
Spatial Reuse and Random Data Hopping in Multihop Ad Hoc Networks
October 15, 2007, 12:00am PDT
Spatial reuse TDMA (Time Division Multiple Access) in multihop ad hoc network is a subject of intense research interest for next generation wireless systems. In this paper, the selection of...
Provided by Jacobs University Bremen
-
White Papers
Local Information Busy Burst Thresholding
February 27, 2009, 12:00am PST
This paper presents a novel approach for setting the thresholds for Busy Burst (BB) enabled interference avoidance in TDD (Time Division Duplex) systems. One of the key issues in the BB concept is...
Provided by Jacobs University Bremen
-
White Papers
Power Control and Interference Awareness Using Busy Bursts
June 9, 2009, 12:00am PDT
This paper presents the integration of power control and the Busy Burst (BB) technique for a TDD OFDMA (Time Division Duplex Orthogonal Frequency Division Multiple Access) system in an urban...
Provided by Jacobs University Bremen
-
White Papers
Design of Learning Based MIMO Cognitive Radio Systems
May 10, 2009, 12:00am PDT
This paper addresses the design issues of the multi-antenna-based Cognitive Radio (CR) system that is able to operate concurrently with the licensed Primary Radio (PR) system. The authors propose...
Provided by Jacobs University Bremen
-
White Papers
Spreadsheet Interaction With Frames: Exploring a Mathematical Practice
May 22, 2009, 12:00am PDT
Since Mathematics really is about what mathematicians do, this paper will look at the mathematical practice of framing, in which an object of interest is viewed in terms of well-understood...
Provided by Jacobs University Bremen
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