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 -