TY - JOUR
AU - Krotzky, T.
AU - Fober, T.
AU - Hüllermeier, Eyke
AU - Klebe, G.
ID - 10317
IS - 5
JF - IEEE/ACM Trans. Comput. Biology Bioinform.
TI - Extended Graph-Based Models for Enhanced Similarity Search in Cavbase
VL - 11
ER -
TY - JOUR
AU - Stock, M.
AU - Fober, T.
AU - Hüllermeier, Eyke
AU - Glinca, S,
AU - Klebe, G.
AU - Pahikkala, T.
AU - Airola, A.
AU - De Baets, B.
AU - Wageman, W.
ID - 10318
IS - 6
JF - IEEE/ACM Trans. Comput. Biology Bioinform.
TI - Identification of Functionally Releated Enzymes by Learning to Rank Methods
VL - 11
ER -
TY - JOUR
AU - Beister, Frederic
AU - Dräxler, Martin
AU - Aelken, Jörg
AU - Karl, Holger
ID - 1375
JF - Computer Communications
SN - 0140-3664
TI - Power model design for ICT systems – A generic approach
VL - 50
ER -
TY - CONF
AU - Wessel, Jan
AU - Schmalz, Klaus
AU - Cahill, Brian
AU - Scheytt, Christoph
ID - 24300
T2 - Elektrotechnisches Kolloquium
TI - Design of an Electrical Interferometer at 120 GHz for Contactless Permittivity Characterization
ER -
TY - CONF
AB - Energy efficiency drives the development of more and more complex low-power designs. Based on dynamic power management techniques, multiple voltage islands as well as a huge amount of power states are specified that have to be tested carefully. In this context, low-power design should start at an early stage using state-of-the-art system-level modeling and simulation techniques. However, there is neither a programming language nor any modeling standard that reflects variable power together with its functional side effects in a well-suited abstract manner. To overcome this limitation, we present a modeling approach on top of SystemC TLM to capture low-power design characteristics at electronic system-level. We demonstrate the usability by means of an existing open-source low-power design. The experimental results show that appropriate TLM instrumentation cause only minimal simulation overhead, but offer sufficient details to identify common low-power design errors.
AU - Mischkalla, Fabian
AU - Müller, Wolfgang
ID - 24305
T2 - Embedded Computer Systems: Architectures, Modeling, and Simulation (SAMOS XIV)
TI - Architectural Low-Power Design Using Transaction-Based System Modeling and Simulation
ER -
TY - CONF
AB - A 115 GHz slow wave transmission line intended for phase detection based integrated biosensors is presented. The structure was fabricated in a 130 nm SiGe process. It achieved the targeted overall phase shift of 1° at 115 GHz. Moreover, the phase can be adjusted by 16 switches using Heterojunction Bipolar (HBT) transistors leading to a phase resolution of 0.125°. The change in input and output matching over all configurations of the switches is not higher than 0.8 dB and the transmission S 21 varies with less than 0.7 dB. To the authors knowledge, it is the first switchable slow wave structure using microstrip transmission lines along with a bipolar switch circuitry. Moreover, the presented structure provides a very powerful solution for real-time digital read-outs in integrated biosensors, without need of additional signal processing steps.
AU - Wessel, Jan
AU - Schmalz, Klaus
AU - Scheytt, Christoph
AU - Meliani, Chafik
ID - 24308
T2 - Microwave Symposium (IMS), 2014 IEEE MTT-S International
TI - Switchable slow wave transmission line in 130 nm SiGe technology at 115 GHz for phase detection based biosensors
ER -
TY - CONF
AB - A calibration technique as well as measurement results for a 7 GHz Biosensor are presented. It is shown that the applied sensor structure can be calibrated by adjusting the phase of a sensing element's transmission S21. This is realized by slowing down the wave traveling a microstrip line serving as a reference in the differential sensor structure. The dielectric properties along with certain physical boundaries of an obstacle covering parts of the microstrip line evoke that effect. Measurements with an ethanol serious along with simulation results showed that sensitivity can be increased substantially with this calibration technique. A change of the real part of the sample's permittivity of 48 leads to a 18 MHz frequency shift.
AU - Wessel, Jan
AU - Schmalz, Klaus
AU - Scheytt, Christoph
AU - Meliani, Chafik
AU - Cahill, Brian
ID - 24303
T2 - European Microwave Conference (EuMC)
TI - A 7 GHz biosensor for permittivity change with enhanced sensitivity through phase compensation
VL - 44th
ER -
TY - CONF
AB - There is a continuous increase of bandwidth-demanding services such as ultra HDTV, 3D TV, etc. which will require data rates up to 100-400 Gb/s for short range wireless communication. This paper introduces a novel mixed-mode design where both analog and digital domain design is considered, which helps in the reduction of power consumption. Parallel Sequence Spread Spectrum (PSSS) is used for physical layer (PHY) baseband technology, which considerably alleviates both transmitter and receiver design.
AU - Kraemer, Rolf
AU - Wolf, Andreas
AU - Scheytt, Christoph
AU - Kallfass, Ingmar
AU - KrishneGowda, Karthik
ID - 24307
T2 - 2014 IEEE 15th Annual IEEE Wireless and Microwave Technology Conference (WAMICON)
TI - Wireless 100 Gb/s: PHY layer Overview and Challenges in THz freqency band
ER -
TY - JOUR
AB - In this paper, we present an efficient approach to virtual platform modeling for TriCore-based SoCs by combining fast and open software emulation with IEEE-1666 Standard SystemC simulation. For evaluation we consider Infineon's recently introduced AURIX processor family as a target platform, which utilizes multiple CPU cores operating in lockstep mode, memories, hierarchical buses, and a rich set of peripherals. For SoC prototyping, we integrate the fast and open instruction accurate QEMU software emulator with the TLMu library for SystemC co-verification. This article reports our most recent efforts of the implementation of the TriCore instruction set for QEMU. The experimental results demonstrate the functional correctness and performance of our TriCore implementation.
AU - Koppelmann, Bastian
AU - Messidat, Bernd
AU - Becker, Markus
AU - Kuznik, Christoph
AU - Müller, Wolfgang
AU - Scheytt, Christoph
ID - 24302
JF - Design and Verification Conference (DVCON EUROPE)
TI - Fast and Open Virtual Platforms for TriCore-based SoCs Using QEMU
ER -
TY - JOUR
AB - Verific-MM is an approach to systematize and accelerate the coverage plan engineering as well as the verification environment’s (functional) metric code generation -- usually a time-consuming and error-prone task -- in particular by (i) improving automation via assisted model-based approaches, utilizing recent industry standards such as UCIS and (ii) a supporting methodology suitable for various target (functional coverage) languages (IEEE-1800 SystemVerilog, IEEE-1647 e, IEEE-1666 SystemC).
AU - Kuznik, Christoph
AU - Müller, Wolfgang
ID - 24309
JF - Design, Automation and Test in Europe DATE, University Booth, Dresden
TI - Verific-MM: Systematized Verification Metrics Generation with UCIS for Improved Automation on Verification Closure
ER -
TY - CONF
AU - Scheytt, Christoph
ID - 24304
T2 - Analog 2014,14. Fachtagung der Gesellschaft für Mikroelektronik, Mikrosystemtechnik und Feinwerktechnik des VDE und VDI
TI - System-on-Chip Design für Funkfrequenzen oberhalb von 100 GHz-Herausforderungen und potenzielle Anwendungen
ER -
TY - JOUR
AU - Elkhouly, Mohamed
AU - Mao, Yanfei
AU - Meliani, Chafik
AU - Scheytt, Christoph
AU - Ellinger, Frank
ID - 24306
IS - 9
JF - IEEE JOURNAL OF SOLID-STATE CIRCUITS
TI - A -Band Four-Element Butler Matrix in 0.13 µm SiGe BiCMOS Technology
VL - 49
ER -
TY - CONF
AB - Intelligent automotive electronics significantly improved driving safety in the last decades. With the increasing complexity of automotive systems, dependability of the electronic components themselves and of their interaction must be assured to avoid any risk to driving safety due to unexpected failures caused by internal or external faults. Additionally, Virtual Prototypes (VPs) have been accepted in many areas of system development processes in the automotive industry as platforms for SW development, verification, and design space exploration. We believe that VPs will significantly contribute to the analysis of safety conditions for automotive electronics. This paper shows the advantages of such a methodology based on today's industrial needs, presents the current state of the art in this field, and outlines upcoming research challenges that need to be addressed to make this vision a reality.
AU - Oetjens, Jan-Hendrik
AU - Becker, Markus
AU - Kuznik, Christoph
AU - Müller, Wolfgang
AU - Bannow, Nico
AU - Brinkmann, Oliver
AU - Burger, Andreas
AU - Chaari, Moomen
AU - Chakraborty, Samarjit
AU - Drechsler, R.
AU - Ecker, Wolfgang
AU - Grüttner, Kim
AU - Kruse, Thomas
AU - Le, Hoang M
AU - Mauderer, M.
AU - Mueller-Gritschneider, Daniel
AU - Poppen, Frank
AU - Post, Hendrik
AU - Reiter, SEbastian
AU - Rosenstiel, Wolfgang
AU - Roth, S.
AU - Schlichtmann, Ulf
AU - Von Schwerin, Andreas
AU - Tabacaru, Bogdan Andrei
AU - Viehl, Alexander
ID - 24311
T2 - Design Automation Conference (DAC)
TI - Safety Evaluation of Automotive Electronics Using Virtual Prototypes: State of the Art and Research Challenges
ER -
TY - CONF
AU - Wallscheid, Oliver
AU - Huber, Tobias
AU - Peters, Wilhelm
AU - Böcker, Joachim
ID - 29605
T2 - IECON 2014-40th Annual Conference of the IEEE Industrial Electronics Society
TI - Real-time capable methods to determine the magnet temperature of permanent magnet synchronous motors—A review
ER -
TY - CONF
AU - Specht, Andreas
AU - Wallscheid, Oliver
AU - Böcker, Joachim
ID - 29602
T2 - 2014 International Power Electronics Conference (IPEC-Hiroshima 2014-ECCE ASIA)
TI - Determination of rotor temperature for an interior permanent magnet synchronous machine using a precise flux observer
ER -
TY - CONF
AU - Schafmeister, Frank
AU - Ide, Peter
AU - Richter, Jörg
ID - 30327
T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM)
TI - Adaptable AC Input Phase Switching for Optimum Utilization of Various Grid Configurations supplying Power Electronic Converters and EV/HEV On Board Chargers
ER -
TY - CONF
AU - Li, Ronggyuan
AU - Njiende, Hugues
AU - Schafmeister, Frank
AU - Ide, Peter
ID - 30329
T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM)
TI - A Soft-Switching Interleaved DC-DC Converter with Integrated Magnetics for High Voltage Battery Charger
ER -
TY - CONF
AU - Schafmeister, Frank
AU - Hufnagel, Michael
AU - Ide, Peter
ID - 30328
T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM)
TI - Resistorless Precharging of Boost PFCs by Phase Angle Control of Thyristors
ER -
TY - CONF
AU - Henke, Christian
AU - Trächtler, Ansgar
ID - 30498
T2 - 2013 International Conference on Connected Vehicles and Expo (ICCVE)
TI - Autonomously driven railway cabin convoys — Communication, control design and experimentation
ER -
TY - CONF
AU - Peters, Wilhelm
AU - Böcker, Joachim
ID - 30569
T2 - IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society
TI - Discrete-time design of adaptive current controller for interior permanent magnet synchronous motors (IPMSM) with high magnetic saturation
ER -
TY - CONF
AU - Buchholz, Oleg
AU - Böcker, Joachim
ID - 30568
T2 - IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society
TI - FPGA-based dynamically reconfigurable control of induction motor drives
ER -
TY - CONF
AU - Huber, Tobias
AU - Peters, Wilhelm
AU - Böcker, Joachim
ID - 30579
T2 - 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)
TI - Monitoring critical temperatures in permanent magnet synchronous motors using low-order thermal models
ER -
TY - CONF
AU - Leuer, Michael
AU - Böcker, Joachim
ID - 30577
T2 - 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)
TI - Real-time implementation of an online Model Predictive Control for IPMSM using parallel computing on FPGA
ER -
TY - CONF
AU - Leuer, Michael
AU - Ruting, Arne
AU - Böcker, Joachim
ID - 30580
T2 - 2014 IEEE International Energy Conference (ENERGYCON)
TI - Efficiency-optimized Model Predictive Torque Control for IPMSM
ER -
TY - CONF
AU - Buchholz, Oleg
AU - Böcker, Joachim
ID - 30567
T2 - IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society
TI - FPGA-based dynamically reconfigurable control of induction motor drives
ER -
TY - CONF
AU - Vogt, T.
AU - Peters, A.
AU - Fröhleke, N.
AU - Böcker, Joachim
AU - Kempen, S.
ID - 30578
T2 - 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)
TI - Power profile based selection and operation optimization of parallel-connected power converter combinations
ER -
TY - CONF
AU - Solanki, Jitendra
AU - Fröhleke, Norbert
AU - Böcker, Joachim
AU - Duppe, Gregor
AU - Averberg, Andreas
AU - Wallmeier, Peter
ID - 30581
T2 - 2014 IEEE Energy Conversion Congress and Exposition (ECCE)
TI - Voltage sequence control based high-current rectifier system
ER -
TY - CONF
AU - Solanki, Jitendra
AU - Fröhleke, Norbert
AU - Böcker, Joachim
ID - 30566
T2 - IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society
TI - A completely modular power converter for high-power high-current DC applications
ER -
TY - THES
AU - Specht, A.
ID - 30588
TI - Ermittlung der Rotortemperatur einer Synchronmaschine mit eingebetteten Permanentmagneten für einen automobilen Traktionsantrieb mittels Beobachter basierend auf elektrischen Größen
ER -
TY - THES
AU - Cao, Z.
ID - 30574
SN - 978-3-8440-2785-3
TI - Model-Based Development of DC-DC Converters with Wide Operation Range and High Dynamics
ER -
TY - THES
AU - Hu, M.
ID - 30572
TI - Modeling Optimization and Control Design for LCC Resonant Converter Applied in Very Low Frequency High Voltage Generator
ER -
TY - THES
AU - Pohlenz, Daniel
ID - 30548
TI - Wirkungsgradoptimale Regelung eines elektrischen Fahrantriebes mit variabler Zwischenkreisspannung
ER -
TY - THES
AU - Grote, T.
ID - 30576
TI - Digital Control for Interleaved Boost Power Factor Correction (PFC) Rectifiers
ER -
TY - THES
AU - Leuer, M.
ID - 30575
SN - 978-3-8440-2776-1
TI - Modellprädiktive Regelung permanent erregter Synchronmotoren im Antriebsstrang von Automobilen
ER -
TY - THES
AU - Uebener, S.
ID - 30587
TI - Evaluierung und Anwendung eines Emulators für elektrische Maschinen in der Entwicklung von Elektro- und Hybridfahrzeugen
ER -
TY - THES
AU - Schneider, T.
ID - 30573
TI - Traktionsantrieb mit linearem geschalteten Reluktanzmotor für ein autonomes Bahnfahrzeug
ER -
TY - CONF
AU - Wendlandt, Stefan
AU - Krause, Melanie
AU - Berendes, Sarah
AU - Hanusch, Matthias
AU - Drobisch, Alexander
AU - Berghold, Juliane
AU - Schoppa, Michael
AU - Grunow, Paul
AU - Krauter, Stefan
ID - 6941
T2 - Proceedings of the 29th European Photovoltaic Solar Energy Conference and Exhibition, Amsterdam (The Netherlands), September 22-16, 2014
TI - Comparison of Hot Spot Investigations under Laboratory and Field Conditions at Photovoltaic Modules
ER -
TY - CONF
AU - Ober-Blöbaum, Sina
AU - Lindhorst, H.
ID - 29440
T2 - 21st International Symposium on Mathematical Theory of Networks and Systems
TI - Variational formulation and structure-preserving discretization of nonlinear electric circuits
ER -
TY - CONF
AU - Gail, T.
AU - Leyendecker, S.
AU - Ober-Blöbaum, Sina
ID - 29438
T2 - 3rd Joint Interntaional Conference on Multibody System Dynamics
TI - On the role of quadrature rules and system dimensions in variational multirate integrators
ER -
TY - CHAP
AU - Trächtler, Ansgar
AU - Kleinjohann, Bernd
AU - Heinzemann, Christian
AU - Rasche, Christoph
AU - Priesterjahn, Claudia
AU - Steenken, Dominik
AU - Wehrheim, Heike
AU - Gausemeier, Jürgen
AU - Flaßkamp, Kathrin
AU - Kleinjohann, Lisa
AU - Krüger, Martin
AU - Iwanek, Peter
AU - Hartmann, Philip
AU - Dorociak, Rafal
AU - Groesbrink, Stefan
AU - Ziegert, Steffen
AU - Meyer, Tobias
AU - Sextro, Walter
AU - Schäfer, Wilhelm
ED - Gausemeier, Jürgen
ED - Josef Rammig, Franz
ED - Schäfer, Wilhelm
ED - Sextro, Walter
ID - 20085
SN - 978-3-642-53741-7
T2 - Dependability of Self-Optimizing Mechatronic Systems
TI - Case Study
ER -
TY - JOUR
AU - Ober-Blöbaum, Sina
AU - Saake, N.
ID - 29404
JF - Advances in Computational Mathematics
TI - Construction and analysis of higher order Galerkin variational integrators
ER -
TY - CHAP
AU - Anacker, H.
AU - Dellnitz, M.
AU - Flaßkamp, K.
AU - Grocsbrink, S.
AU - Hartmann, P.
AU - Heinzemann, C.
AU - Horenkamp, C.
AU - Kleinjohann, B.
AU - Korf, S.
AU - Krüger, M.
AU - Müller, W.
AU - Ober-Blöbaum, Sina
AU - Oberthür, S.
AU - Porrmann, M.
AU - Priesterjahn, C.
AU - Radkowski, R.
AU - Rasche, C.
AU - Rieke, J.
AU - Ringkamp, M.
AU - Stahl, K.
AU - Steenken, D.
AU - Stöcklein, J.
AU - Timmermann, R.
AU - Trächtler, A.
AU - Witting, K.
AU - Xie, T.
AU - Ziegert, S.
ID - 20080
SN - 978-3-642-45434-9
T2 - Jürgen Gausemeier, Franz Josef Rammig, and Wilhelm Schäfer, editors, Design Methodology for Intelligent Technical Systems
TI - Methods for the Design and Development
ER -
TY - CHAP
AU - Dangelmeier, W.
AU - Dellnitz, M.
AU - Dorociak, R.
AU - Flaßkamp, K.
AU - Gausemeier, J.
AU - Groesbrink, S.
AU - Hartmann, P.
AU - Heinzemann, C.
AU - Hölscher, C.
AU - Iwanek, P.
AU - Keßler, J.H.
AU - Kleinjohann, B.
AU - Kleinjohann, L.
AU - Korf, S.
AU - Krüger, M.
AU - Meyer, T.
AU - Müller, W.
AU - Ober-Blöbaum, Sina
AU - Porrmann, M.
AU - Priesterjahn, C.
AU - Rammig, F.J.
AU - Rasche, C.
AU - Reinold, P.
AU - Schäfer, W.
AU - Seifried, A.
AU - Sextro, W.
AU - Sondermann-Woelke, C.
AU - Stahl, K.
AU - Steenken, D.
AU - Timmermann, R.
AU - Trächtler, A.
AU - Vaßholz, M.
AU - Wehrheim, H.
AU - Witting, K.
AU - Xie, T.
AU - Zhao, Y.
AU - Ziegert, S.
AU - Zimmer, D.
ID - 29417
T2 - Lecture Notes in Mechanical Engineering
TI - Dependability of Self-optimizing Mechatronic Systems
ER -
TY - CHAP
AU - Dellnitz, M.
AU - Dumitrescu, R.
AU - Flaßkamp, K.
AU - Gausemeier, J.
AU - Hartmann, P.
AU - Iwanek, P.
AU - Korf, S.
AU - Krüger, M.
AU - Ober-Blöbaum, Sina
AU - Porrmann, M.
AU - Priesterjahn, C.
AU - Stahl, K.
AU - Trächtler, A.
AU - Vaßholz, M.
ID - 29416
T2 - Jürgen Gausemeier, Franz Josef Rammig, and Wilhelm Schäfer, editors, Design Methodology for Intelligent Technical Systems
TI - The paradigm of self-optimization
ER -
TY - CHAP
AU - Leitz, T.
AU - Ober-Blöbaum, Sina
AU - Leyendecker, S.
ID - 29414
T2 - Zdravko Terze, Multibody Dynamics
TI - Variational Lie group formulation of geometrically exact beam dynamics: Synchronous and asynchronous integration
VL - 35
ER -
TY - JOUR
AU - Weich, Tobias
ID - 31294
IS - 10
JF - Journal of Mathematical Physics
KW - Mathematical Physics
KW - Statistical and Nonlinear Physics
SN - 0022-2488
TI - Equivariant spectral asymptotics forh-pseudodifferential operators
VL - 55
ER -
TY - JOUR
AU - Vogt, T.
AU - Böcker, Joachim
AU - Kempen, S.
ID - 33029
JF - BWK – Das Energie-Fachmagazin – Springer VDI Verlag, Ausgabe 12-2014
TI - Die Rolle von Batteriespeichern in KMU-Microgrids
ER -
TY - CONF
AU - Vogt, T.
AU - Fröhleke, N.
AU - Böcker, Joachim
AU - Kempen, S.
ID - 33107
T2 - 6th World Conference on Photovoltaic Energy Conversion (WCPEC)
TI - Design Considerations on Peak Power Clipping Thresholds in Microgrids
ER -
TY - JOUR
AB - Following Bertoin who considered the ergodicity and exponential decay of Lévy processes in a finite domain, we consider general Lévy processes and their ergodicity and exponential decay in a finite interval. More precisely, given Ta=inf{t>0:Xt∉. Under general conditions, e.g. absolute continuity of the transition semigroup of the unkilled Lévy process, we prove that the killed semigroup is a compact operator. Thus, we prove stronger results in view of the exponential ergodicity and estimates of the speed of convergence. Our results are presented in a Lévy processes setting but are well applicable for Markov processes in a finite interval under information about Lebesgue irreducibility of the killed semigroup and that the killed process is a double Feller process. For example, this scheme is applicable to a work of Pistorius.
AU - Kolb, Martin
AU - Savov, Mladen
ID - 33361
IS - 31
JF - Electronic Communications in Probability
TI - Exponential ergodicity of killed Lévy processes in a finite interval
VL - 19
ER -
TY - JOUR
AB - We study the influence of the intrinsic curvature on the large time behaviour of the heat equation in a tubular neighbourhood of an unbounded geodesic in a two-dimensional Riemannian manifold. Since we consider killing boundary conditions, there is always an exponential-type decay for the heat semigroup. We show that this exponential-type decay is slower for positively curved manifolds comparing to the flat case. As the main result, we establish a sharp extra polynomial-type decay for the heat semigroup on negatively curved manifolds comparing to the flat case. The proof employs the existence of Hardy-type inequalities for the Dirichlet Laplacian in the tubular neighbourhoods on negatively curved manifolds and the method of self-similar variables and weighted Sobolev spaces for the heat equation.
AU - Kolb, Martin
AU - Krejčiřík, David
ID - 33362
IS - 2
JF - Journal of Spectral Theory
TI - The Brownian traveller on manifolds
VL - 4
ER -
TY - CONF
AU - Scheytt, Christoph
ID - 24301
T2 - Fakultätskolloquium der Fakultät für Elektrotechnik und Informationstechnik
TI - mm-Wellen- und Electronic-Photonic System-on-Chip Design
ER -
TY - CONF
AU - Mischkalla, Fabian
AU - Müller, Wolfgang
ID - 25120
T2 - Embedded Computer Systems: Architectures, Modeling, and Simulation (SAMOS XIV)
TI - Architectural Low-Power Design Using Transaction-Based System Simulation
ER -
TY - CONF
AU - Joy, M. tech. Mabel Mary
AU - Müller, Wolfgang
AU - Rammig, Franz-Josef
ID - 25146
T2 - 12th IEEE International conference on Embedded Computing
TI - Source code annotated memory leak detection for soft real time embedded systems with resource constraints
ER -
TY - CONF
AU - Mischkalla, Fabian
AU - Müller, Wolfgang
ID - 25144
T2 - PATMOS 2014
TI - Advanced SoC Virtual Prototyping for System-Level Power Planning and Validation
ER -
TY - CONF
AB - This paper presents an advanced eight levels spanning SystemC based virtual platform methodology and framework - referred to as HeroeS 3 - providing smooth application to platform mapping and continuous co-refinement of a virtual prototype with its physical environment model. For heterogeneity support, various SystemC extensions are combined covering continuous/discrete models of computation and different communication abstractions, such as analog mixed-signal models, abstract RTOS/HAL/middleware models, TLM bus models, and QEMU wrappers. We enable dependability assessment by Fault Effect Modeling (FEM) at the virtual prototype in order to avoid risking physical injury or damage. Also, simulation results are deterministic and can be evaluated interactively or offline. We apply FEM to both the physical environment model and the different abstractions of the virtual prototype. Currently, we focus on sensor failures and application control flow errors.
AU - Becker, Markus
AU - Kuznik, Christoph
AU - Müller, Wolfgang
ID - 36918
KW - Computational modeling
KW - Finite element analysis
KW - Prototypes
KW - Abstracts
KW - Software
KW - Fault tolerance
KW - Fault tolerant systems
TI - Fault Effect Modeling in a Heterogeneous SystemC Based Virtual Platform Framework for Cyber Physical Systems
ER -
TY - CONF
AB - The ever-increasing complexity of heterogeneous electronic systems demand for intensified abstraction and automation efforts to improve design, verification and validation productivity, especially in earlier phases of system engineering. Within the verification activity various metrics can be applied to determine functional correctness or the overall progress. Here, a supporting verification methodology defining high-level verification planning down to the actual metric code development is essential. Moreover, an advanced assistance for the designer, such as a tooling infrastructure to automatize and accelerate the metric code implementation, is needed to minimize the influence of errorprone manual coding. In this article we present a single-source verification metric code-generation methodology for improved coverage automation. We determine (i) a suitable metric model for model-based capture of verification metrics as well as (ii) an assisted model-based processing and generation flow of the verification environment and metric skeletons. We apply our method to a SystemC case-study, in doing so, targeting metric code implementation productivity and consistency enhancement.
AU - Kuznik, Christoph
AU - Müller, Wolfgang
AU - Defo, Gilles Bertrand
ID - 36917
KW - System Design
KW - Verification
TI - An Assisted Single Source Verification Metric Model Code Generation Methodology
ER -
TY - CONF
AB - Zur Sicherstellung hoher Zuverlässigkeits- und Fehlertoleranzwerte von Schaltungen und ganzen Systemen finden vermehrt Test- und Verifikationsmethoden Anwendung die einen virtuellen Prototypen (VP) des Systems bereits frühzeitig im Entwurfsablauf einem Stresstest unterziehen. Hierbei werden speziell für die Domäne relevante Fehlerinjektoren verwendet (Digital, Mixed-Signal, Mechanik) die anhand von Fehlermodellen geeignete Testfälle erzeugen und in das System über Stimuli bzw. direkt injizieren. Jede effektive Anwendung einer Methode bedingt jedoch auch das Vorhandensein einer zugrundeliegenden Methodik. In diesem Beitrag wird die System Verification Methodology (SVM) vorgestellt werden, eine universell einsetzbare und erweiterbare Infrastruktur zur Beschreibung von Testumgebungen auf Basis der SystemC Sprache und Simulationskernels.
AU - Kuznik, Christoph
AU - Müller, Wolfgang
ID - 25166
T2 - 26. ITG / GI / GMM Workshop Testmethoden und Zuverlässigkeit von Schaltungen und Systemen
TI - Modellierung effizienter Stresstest-Umgebungen für virtuelle Prototypen mit SVM
ER -
TY - CONF
AU - Kuznik, Christoph
AU - Defo, Bertrand Gilles
AU - Müller, Wolfgang
ID - 25163
T2 - 17. Workshop Methoden und Beschreibungssprachen zur Modellierung und Verifikation von Schaltungen und Systemen (MBMV 2014)
TI - Semi-automatische Generierung von Überdeckungsmetriken mittels methodischer Verikationsplan Verarbeitung
ER -
TY - JOUR
AU - Kuznik, Christoph
AU - Defo, Bertrand Gilles
AU - Müller, Wolfgang
ID - 25151
JF - Electronic System Level Synthesis Conference (ESLSyn)
TI - An Assisted Single Source Verification Metric Model Code Generation Methodology
ER -
TY - CONF
AU - Temmen, Katrin
AU - Nofen, Barbara
AU - Wehebrink, Markus
ID - 35714
T2 - 2014 IEEE Global Engineering Education Conference (EDUCON)
TI - Lecture meets laboratory experimental experiences for large audiences: Concept and implementation
ER -
TY - JOUR
AU - Barkhofen, Sonja
AU - Faure, F
AU - Weich, Tobias
ID - 31296
IS - 8
JF - Nonlinearity
KW - Applied Mathematics
KW - General Physics and Astronomy
KW - Mathematical Physics
KW - Statistical and Nonlinear Physics
SN - 0951-7715
TI - Resonance chains in open systems, generalized zeta functions and clustering of the length spectrum
VL - 27
ER -
TY - JOUR
AU - Weich, Tobias
AU - Barkhofen, Sonja
AU - Kuhl, U
AU - Poli, C
AU - Schomerus, H
ID - 31297
IS - 3
JF - New Journal of Physics
KW - General Physics and Astronomy
SN - 1367-2630
TI - Formation and interaction of resonance chains in the open three-disk system
VL - 16
ER -
TY - CONF
AU - Panhwar, M. F.
AU - Sandel, D.
AU - Woerdehoff, C.
AU - Puntsri, K.
AU - Hussin, S.
AU - Noé, Reinhold
ID - 38470
SN - 978-1-922107-21-3
T2 - 2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)
TI - PU-CMA-QAM BASED MIMO EQUALIZATION IN DSP-ENABLED PDM-16-QAM RECEIVERS
ER -
TY - CONF
AU - Hussin, S.
AU - Noé, Reinhold
ID - 38474
SN - 2374-0140
T2 - 2014 IEEE PHOTONICS CONFERENCE (IPC)
TI - Fiber nonlinearity Mitigation in CO-OFDM Systems using Dual Compensators
ER -
TY - CONF
AU - Noé, Reinhold
AU - Panhwar, M. F.
AU - Woerdehoff, C.
AU - Sandel, D.
ID - 38465
SN - 2076-1465
T2 - 2014 PROCEEDINGS OF THE 22ND EUROPEAN SIGNAL PROCESSING CONFERENCE (EUSIPCO)
TI - REALTIME DIGITAL SIGNAL PROCESSING IN COHERENT OPTICAL PDM-QPSK AND PDM-16-QAM TRANSMISSION
ER -
TY - CONF
AU - Koch, B.
AU - Noé, Reinhold
AU - Mirvoda, V.
AU - Sandel, D.
AU - Panhwar, M. F.
ID - 38405
SN - 978-1-922107-21-3
T2 - 2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)
TI - SIMPLE POLARIZATION-DEPENDENT LOSS MEASUREMENT BASED ON POLARIZATION SCRAMBLING
ER -
TY - JOUR
AU - Koch, Benjamin
AU - Noé, Reinhold
AU - Sandel, David
AU - Mirvoda, Vitali
ID - 38401
IS - 7
JF - OPTICS EXPRESS
SN - 1094-4087
TI - Versatile endless optical polarization controller/tracker/demultiplexer
VL - 22
ER -
TY - CONF
AU - Hussin, S.
AU - Noé, Reinhold
AU - Panhwar, M. F.
ID - 38392
SN - 978-1-922107-21-3
T2 - 2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)
TI - IMPROVEMENT OF RF-PILOT PHASE NOISE COMPENSATION FOR CO-OFDM TRANSMISSION SYSTEMS VIA COMMON PHASE ERROR EQUALIZER
ER -
TY - CONF
AU - Koch, B.
AU - Noé, Reinhold
AU - Mirvoda, V.
AU - Sandel, D.
AU - Panhwar, M. F.
ID - 38362
SN - 978-1-922107-21-3
T2 - 2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)
TI - 40 dB CROSSTALK SUPPRESSION IN HIGH-PRECISION ENDLESS POLARIZATION CONTROL
ER -
TY - CONF
AU - Koch, B.
AU - Noé, Reinhold
AU - Mirvoda, V.
AU - Sandel, D.
AU - Panhwar, M. F.
ID - 38360
SN - 978-1-922107-21-3
T2 - 2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)
TI - APD-BASED INTERFERENCE DETECTORS YIELD 7-dB DYNAMIC RANGE OF 70-krad/s PDM-DPSK ENDLESS POLARIZATION DEMULTIPLEXER
ER -
TY - CONF
AU - Koch, Benjamin
AU - Noé, Reinhold
AU - Mirvoda, Vitali
AU - Sandel, David
ID - 38323
SN - 978-1-55752-993-0
T2 - 2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
TI - 1-THz Bandwidth of 70-krad/s Endless Optical Polarization Control
ER -
TY - CONF
AU - Koch, B.
AU - Noé, Reinhold
AU - Mirvoda, V.
AU - Sandel, D.
AU - Panhwar, M. F.
ID - 38310
SN - 978-1-922107-21-3
T2 - 2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)
TI - APD-BASED INTERFERENCE DETECTORS YIELD 7-dB DYNAMIC RANGE OF 70-krad/s PDM-DPSK ENDLESS POLARIZATION DEMULTIPLEXER
ER -
TY - CONF
AU - Koch, B.
AU - Noé, Reinhold
AU - Mirvoda, V.
AU - Sandel, D.
AU - Panhwar, M. F.
ID - 38312
SN - 978-1-922107-21-3
T2 - 2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)
TI - 40 dB CROSSTALK SUPPRESSION IN HIGH-PRECISION ENDLESS POLARIZATION CONTROL
ER -
TY - CONF
AU - Koch, Benjamin
AU - Noé, Reinhold
AU - Mirvoda, Vitali
AU - Sandel, David
ID - 38240
T2 - OFC 2014
TI - 1-THz bandwidth of 70-krad/s endless optical polarization control
ER -
TY - JOUR
AU - Rösler, Margit
AU - Remling, Heiko
ID - 37667
JF - Journal of Approximation Theory
KW - Applied Mathematics
KW - General Mathematics
KW - Numerical Analysis
KW - Analysis
SN - 0021-9045
TI - Convolution algebras for Heckman–Opdam polynomials derived from compact Grassmannians
VL - 197
ER -
TY - JOUR
AB - A millimeter wave frequency mixed-signal design of a 1-tap half-rate look-ahead decision feedback equalizer for 80 Gb/s short-reach optical communication systems is presented. On-wafer tests are developed to determine the maximum operating bit rate of the equalizer. Results are also presented for intersymbol interference mitigation at 80 Gb/s for a 20 GHz bandwidth-limited channel. Further improvements on the architecture of the 80 Gb/s equalizer are discussed and used in the design and on-wafer measurement of a 110 Gb/s equalizer. The equalizers are designed in a 0.13 μm SiGe:C BiCMOS technology. The 80 and 110 Gb/s versions dissipate 4 and 5.75 W, respectively and occupy 2 and 2.56 mm 2 , respectively.
AU - Awny, Ahmed
AU - Möller, Lothar
AU - Junio, Josef
AU - Scheytt, Christoph
AU - Thiede, Andreas
ID - 24310
IS - No.2
JF - IEEE JOURNAL OF SOLID-STATE CIRCUITS
TI - Design and Measurement Techniques for an 80 Gb/s 1-Tap Decision Feedback Equalizer
VL - Vol.49
ER -
TY - CONF
AU - Hussin, S.
AU - Noé, Reinhold
AU - Panhwar, M. F.
ID - 38416
SN - 978-1-922107-21-3
T2 - 2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014)
TI - FIBER NONLINEARITY TOLERANCE OF PARTIAL PILOT FILLING IN CO-OFDM TRANSMISSION SYSTEMS
ER -
TY - CONF
AU - Koch, Benjamin
AU - Noé, Reinhold
AU - Mirvoda, Vitali
AU - Sandel, David
ID - 38373
SN - 978-1-55752-993-0
T2 - 2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
TI - 1-THz Bandwidth of 70-krad/s Endless Optical Polarization Control
ER -
TY - CONF
AB - Amplitude-to-amplitude interactions between neural oscillations are of a special interest as they show how the strength of spatial synchronization in different neuronal populations relates to each other during a given task. While, previously, amplitude-to-amplitude correlations were studied primarily on the sensor level, we present a source separation approach using spatial filters which maximize the correlation between the envelopes of brain oscillations recorded with electro-/magnetencephalography (EEG/MEG) or intracranial multichannel recordings. Our approach, which is called canonical source power correlation analysis (cSPoC), is thereby capable of extracting genuine brain oscillations solely based on their assumed coupling behavior even when the signal-to-noise ratio of the signals is low.
AU - Dähne, S.
AU - Nikulin, V. V.
AU - Ramírez, D.
AU - Schreier, P. J.
AU - Müller, K.-R.
AU - Haufe, S.
ID - 40766
T2 - Proc. Int. Work. Pattern Recognition In Neuroimaging
TI - Optimizing spatial filters for the extraction of envelope-coupled neural oscillations
ER -
TY - JOUR
AB - The separation of a complex mixture based solely on second-order statistics can be achieved using the Strong Uncorrelating Transform (SUT) if and only if all sources have distinct circularity coefficients. However, in most problems we do not know the circularity coefficients, and they must be estimated from observed data. In this work, we propose a detector, based on the generalized likelihood ratio test (GLRT), to test the separability of a complex Gaussian mixture using the SUT. For the separable case (distinct circularity coefficients), the maximum likelihood (ML) estimates are straightforward. On the other hand, for the non-separable case (at least one circularity coefficient has multiplicity greater than one), the ML estimates are much more difficult to obtain. To set the threshold, we exploit Wilks’ theorem, which gives the asymptotic distribution of the GLRT under the null hypothesis. Finally, numerical simulations show the good performance of the proposed detector and the accuracy of Wilks’ approximation.
AU - Ramírez, D.
AU - Schreier, P. J.
AU - Vía, J.
AU - Santamaría, I.
ID - 40775
JF - Signal Process.
TI - Testing blind separability of complex Gaussian mixtures
VL - 95
ER -
TY - JOUR
AU - Manco-Vásquez, J.
AU - Lázaro-Gredilla, M.
AU - Ramírez, D.
AU - Vía, J.
AU - Santamaría, I.
ID - 40771
JF - Signal Process.
TI - A Bayesian approach for adaptive multiantenna sensing in cognitive radio networks
VL - 96, Part B
ER -
TY - CONF
AU - Stein, Manuel
AU - Lenz, Andreas
AU - Mezghani, Amine
AU - Nossek, Josef A.
ID - 40770
T2 - Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
TI - Optimum analog receive filters for detection and inference under a sampling rate constraint
ER -
TY - CONF
AU - Lameiro, Christian
AU - Utschick, Wolfgang
AU - Santamaría, Ignacio
ID - 40772
T2 - Proc. Int. ITG Work. Smart Antennas
TI - Spatial Shaping and Precoding Design for Underlay MIMO Interference Channels
ER -
TY - CONF
AU - Stein, Manuel
AU - Castañeda, Mario
AU - Nossek, Josef A.
ID - 40773
T2 - Proc.\ ITG Int.\ Work. Smart Ant.
TI - Information-preserving spatial filtering for direction-of-arrival estimation
ER -
TY - JOUR
AU - Schreier, Peter J.
ID - 40776
JF - ForschungsForum Paderborn
TI - Neue Anwendungsgebiete für Computer Assisted Surgery (CAS)
VL - 17
ER -
TY - CONF
AU - Stein, Manuel
AU - Nossek, Josef A.
ID - 40774
T2 - Proc. of IEEE/ION PLANS 2014
TI - Will the 1-bit GNSS receiver prevail?
ER -
TY - CONF
AB - We derive the generalized likelihood ratio test (GLRT) for detecting cyclostationarity in scalar-valued time series. The main idea behind our approach is Gladyshev’s relationship, which states that when the scalar-valued cyclostationary sig- nal is blocked at the known cycle period it produces a vector- valued wide-sense stationary process. This result amounts to saying that the covariance matrix of the vector obtained by stacking all observations of the time series is block-Toeplitz if the signal is cyclostationary, and Toeplitz if the signal is wide- sense stationary. The derivation of the GLRT requires the maximum likelihood estimates of Toeplitz and block-Toeplitz matrices. This can be managed asymptotically (for large num- berofsamples)exploitingSzego ̈’stheoremanditsgeneraliza- tion for vector-valued processes. Simulation results show the good performance of the proposed GLRT.
AU - Ramírez, D.
AU - Scharf, L. L.
AU - Vía, J.
AU - Santamaría, I.
AU - Schreier, P. J.
ID - 40768
T2 - Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.
TI - An asymptotic GLRT for the detection of cyclostationary signals
ER -
TY - CONF
AB - Successive interference cancellation (SIC) has been extensively applied to estimate transmit signals in communication systems. When the channel state information (CSI) and noise statistics are imperfectly estimated, the standard SIC estimators that ignore the model mismatch may perform poorly. This paper introduces regularized SIC estimation to provide robustness against the model mismatch. Suboptimal, low-complexity implementations using (sorted) QR decomposition and approximate choice of regularization parameters are also introduced. Simulation examples demonstrate that the regularized SIC estimators can significantly outperform the standard version.
AU - Tong, Jun
AU - Guo, Qinghua
AU - Schreier, Peter J.
AU - Xi, Jiangtao
ID - 40767
T2 - Proc.\ IEEE Work.\ Stat.\ Signal Process.
TI - Regularized successive interference cancellation (SIC) under mismatched modeling
ER -
TY - JOUR
AU - Stein, Manuel
AU - Castañeda, Mario
AU - Mezghani, Amine
AU - Nossek, Josef A.
ID - 40764
IS - 7
JF - IEEE Signal Process.\ Lett.
TI - Information-preserving transformations for signal parameter estimation
VL - 21
ER -
TY - CONF
AB - In this paper, we present an efficient approach to virtual platform modeling for TriCore-based SoCs by combining fast and open software emulation with IEEE-1666 Standard SystemC simulation. For evaluation we consider Infineon's recently introduced AURIX processor family as a target platform, which utilizes multiple CPU cores operating in lockstep mode, memories, hierarchical buses, and a rich set of peripherals. For SoC prototyping, we integrate the fast and open instruction accurate QEMU software emulator with the TLMu library for SystemC co-verification. This article reports our most recent efforts of the implementation of the TriCore instruction set for QEMU. The experimental results demonstrate the functional correctness and performance of our TriCore implementation.
AU - Koppelmann, Bastian
AU - Messidat, Bernd
AU - Becker, Markus
AU - Müller, Wolfgang
AU - Scheytt, J. Christoph
ID - 34585
KW - System Design
KW - Verification
T2 - Proceedings of the Design and Verification Conference Europe (DVCON Europe)
TI - Fast and Open Virtual Platforms for TriCore-based SoCs Using QEMU
ER -
TY - JOUR
AU - Bogdan, Krzysztof
AU - Dyda, Bartłomiej
AU - Luks, Tomasz
ID - 40068
IS - 2
JF - Hiroshima Mathematical Journal
SN - 0018-2079
TI - On Hardy spaces of local and nonlocal operators
VL - 44
ER -
TY - JOUR
AB - In this paper, we propose a novel mechanism for spectrum sensing that leads us to exploit the spatio-temporal correlation present in the received signal at a multi-antenna receiver. For the proposed mechanism, we formulate the spectrum sensing scheme by adopting the generalized likelihood ratio test (GLRT). However, the GLRT degenerates in the case of limited sample support. To circumvent this problem, several extensions are proposed that bring robustness to the GLRT in the case of high dimensionality and small sample size. In order to achieve these sample-efficient detection schemes, we modify the GLRT-based detector by exploiting the covariance structure and factoring the large spatio-temporal covariance matrix into spatial and temporal covariance matrices. The performance of the proposed detectors is evaluated by means of numerical simulations, showing important advantages over existing detectors.
AU - Ali, S.
AU - Ramírez, D.
AU - Jansson, M.
AU - Seco-Granados, G.
AU - López-Salcedo, J. A.
ID - 40757
JF - Eurasip\ J.\ Applied Signal Process.
TI - Multi-antenna spectrum sensing by exploiting spatio-temporal correlation
VL - 160
ER -
TY - JOUR
AU - Draper, Bruce
AU - Kirby, Michael
AU - Marks, Justin
AU - Marrinan, Tim
AU - Peterson, Chris
ID - 40754
JF - Lin.\ Alg.\ Appl.
TI - A flag representation for finite collections of subspaces of mixed dimensions
VL - 451
ER -
TY - CONF
AB - It is well known that input-to-state stability admits an astonishing number of equivalent characterizations. Here it is shown that for monotone systems on $\Rnp$ there are some additional characterizations that are useful for network stability analysis. These characterizations include system theoretic properties, algebraic properties, as well as the problem of finding simultaneous bounds on solutions to a collection of inequalities.
AU - Rüffer, Björn S.
AU - Sailer, Rudolf
ID - 40753
T2 - Proc. 21st Int. Symp. Mathematical Theory of Networks and Systems (MTNS)
TI - Input-to-State Stability for Discrete-Time Monotone Systems
ER -
TY - JOUR
AU - Huang, L.
AU - Xiao, Y-.H.
AU - So, H. C.
AU - Fang, J.
ID - 40755
IS - 2
JF - IEEE Transactions on Wireless Communications
TI - Accurate Performance Analysis of Hadamard Ratio Test for Robust Spectrum Sensing
VL - 14
ER -
TY - CONF
AU - Marrinan, Tim
AU - Draper, Bruce
AU - Beveridge, J. Ross
AU - Kirby, Michael
AU - Peterson, Chris
ID - 40756
T2 - CVPR
TI - Finding the Subspace Mean or Median to Fit Your Need
ER -
TY - JOUR
AB - Phase synchronization among neuronal oscillations within the same frequency band has been hypothesized to be a major mechanism for communication between different brain areas. On the other hand, cross-frequency com- munications are more flexible allowing interactions between oscillations with different frequencies. Among such cross-frequency interactions amplitude-to-amplitude interactions are of a special interest as they show how the strength of spatial synchronization in different neuronal populations relates to each other during a given task. While, previously, amplitude-to-amplitude correlations were studied primarily on the sensor level, we present a source separation approach using spatial filters which maximize the correlation between the envelopes of brain oscillations recorded with electro-/magnetoencephalography (EEG/MEG) or intracranial multichannel re- cordings. Our approach, which is called canonical source power correlation analysis (cSPoC), is thereby capable of extracting genuine brain oscillations solely based on their assumed coupling behavior even when the signal-to- noise ratio of the signals is low. In addition to using cSPoC for the analysis of cross-frequency interactions in the same subject, we show that it can also be utilized for studying amplitude dynamics of neuronal oscillations across subjects. We assess the performance of cSPoC in simulations as well as in three distinctively different analysis sce- narios of real EEG data, each involving several subjects. In the simulations, cSPoC outperforms unsupervised state-of-the-art approaches. In the analysis of real EEG recordings, we demonstrate excellent unsupervised dis- covery of meaningful power-to-power couplings, within as well as across subjects and frequency bands.
AU - Dähne, S.
AU - Nikulin, V. V.
AU - Ramírez, D.
AU - Schreier, P. J.
AU - Müller, K.-R.
AU - Haufe, S.
ID - 40758
JF - NeuroImage
TI - Finding brain oscillations with power dependencies in neuroimaging data
VL - 96
ER -
TY - JOUR
AB - Detecting and analyzing directional structures in images is important in many applications since one-dimensional patterns often correspond to important features such as object contours or trajectories. Classifying a structure as directional or non-directional requires a measure to quantify the degree of directionality and a threshold, which needs to be chosen based on the statistics of the image. In order to do this, we model the image as a random field. So far, little research has been performed on analyzing directionality in random fields. In this paper, we propose a measure to quantify the degree of directionality based on the random monogenic signal, which enables a unique decomposition of a 2D signal into local amplitude, local orientation, and local phase. We investigate the second-order statistical properties of the monogenic signal for isotropic, anisotropic, and unidirectional random fields. We analyze our measure of directionality for finite-size sample images, and determine a threshold to distinguish between unidirectional and non-unidirectional random fields, which allows the automatic classification of images.
AU - Olhede, S. C.
AU - Ramírez, D.
AU - Schreier, P. J.
ID - 40762
IS - 10
JF - IEEE Trans.\ Inform.\ Theory
TI - Detecting Directionality in Random Fields Using the Monogenic Signal
VL - 60
ER -
TY - JOUR
AB - Alternating minimization and steepest descent are commonly used strategies to obtain interference alignment (IA) solutions in the $K$-user multiple-input multiple-output (MIMO) interference channel (IC). Although these algorithms are shown to converge monotonically, they experience a poor convergence rate, requiring an enormous amount of iterations which substantially increases with the size of the scenario. To alleviate this drawback, in this letter we resort to the Gauss-Newton (GN) method, which is well-known to experience quadratic convergence when the iterates are sufficiently close to the optimum. We discuss the convergence properties of the proposed GN algorithm and provide several numerical examples showing that it always converges to the optimum with quadratic rate, reducing dramatically the required computation time in comparison to other algorithms, hence paving a new way for the design of IA algorithms.
AU - Lameiro, Christian
AU - Santamaría, Ignacio
ID - 40760
JF - IEEE Signal Process. Lett.
TI - A Quadratically Convergent Method for Interference Alignment in MIMO Interference Channels
VL - 21
ER -
TY - CONF
AB - This paper derives the interference-temperature (IT) limit for a multi-antenna primary user (PU) with a rate constraint. While in the case of a single-antenna PU there is a one-to-one mapping between IT and achievable rate, this correspondence does not hold anymore when a multiple-input multiple-output (MIMO) system is considered. In such cases, the spatial distribution of the interference must be taken into account, since it strongly affects the PU performance. To this end, we derive a closed-form expression for the maximum IT that can be tolerated by identifying the worst-case interference covariance matrix, which results in a multilevel waterfilling problem.
AU - Lameiro, Christian
AU - Utschick, Wolfgang
AU - Santamaría, Ignacio
ID - 40761
T2 - Proc.\ Asilomar Conf.\ Signals Syst.\ Computers
TI - Interference-Temperature Limit for Cognitive Radio Networks with MIMO Primary Users
ER -