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Alias-Free Periodic Signal Analysis using Efficient Rate Nonuniform Sampling Sets

Alias-Free Periodic Signal Analysis using Efficient Rate Non...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Frank Papenfuss Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

In many applications such as signal integrity checking of hardware prototypes or determining dynamic behavior of wideband amplifiers etc. analysis of periodic radio signals with high accuracy is desired. The straight forward approach is to sample the signal to be analyzed with twice its highest harmonic content. But as fundamental frequencies are often far into the MHz range its harmonics may well span into the upper MHz or even GHz range. This leaves two possibilities: first, obey the sampling theorem and sample at that rate. But ADCs able to sample in the GHz range are expensive, power hungry and offer 6 to 8 bits maximum. Sometimes, this is not an option at all. Second, try to live with under sampling accepting alias frequencies in baseband. As long as aliased harmonics do not overlap this presents an acceptable solution. If they overlap, however, nothing can be done once the signal is sampled. But there is one more option presented in this paper, namely the possibility of deliberate nonuniform sampling. If the sampling set is chosen in a convenient way, mostly offered by an additive random sampling (ARS) scheme, this opens up promising possibilities to extend the alias-free processing range into the far MHz or even GHz region.

关键词： Signal analysis Nonuniform sampling Frequency Sampling methods Signal sampling Hardware Prototypes Broadband amplifiers Harmonic analysis Baseband

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Service-Oriented Architectures for Embedded Systems Using Devices Profile for Web Services

Service-Oriented Architectures for Embedded Systems Using De...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Elmar Zeeb Andreas Bobek Hendrik Bohn Frank Golatowski Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

A movement from distributed systems controlled by users to automatic, autonomous and self-configuring distributed systems is noticeable. Web services is one approach but lacking the secure integration of resource-constraint devices. This paper describes the devices profile for Web services (DPWS), underlying protocols and a DPWS toolkit implementation based on C and gSOAP and discuss its current state. It has enormous relevance for embedded systems and industrial automation since DPWS targets resource-constraint devices explicitly, and has the potential to shift the industrial landscape which is characterized of heterogeneous devices.

关键词： Service oriented architecture Embedded system Web services Simple object access protocol Java Multicast protocols Distributed control Automatic control Control systems microelectronics

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Lessons learned from implementing the Devices Profile for Web Services

Lessons learned from implementing the Devices Profile for We...

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Inaugural IEEE-IES Digital EcoSystems and Technologies Conference, DEST

作者： Elmar Zeeb Andreas Bobek Hendrik Bohn Frank Golatowski Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

In recent years a movement from distributed systems controlled by users to automatic, autonomous and self-configuring distributed systems is noticeable. Web services is one approach but lacking the secure integration of resource-constrained devices. This paper describes the devices profile for web services (DPWS), underlying protocols and a DPWS toolkit implementation based on C and gSOAP and discusses its current state. It has enormous relevance for embedded systems and industrial automation since DPWS targets resource-constraint devices explicitly, and has the potential to shift the industrial landscape which is characterized of heterogeneous devices.

关键词： Web services Service oriented architecture Protocols Java Embedded system Distributed control Automatic control Control systems Electrical equipment industry Automation

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2-MASCLE - A Coverage Aware Clustering Algorithm with Self Healing Abilities

2-MASCLE - A Coverage Aware Clustering Algorithm with Self H...

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Intelligent Sensors, Sensor Networks and Information Processing Conference (ISSNIP)

作者： Jakob Salzmann Ralf Behnke Dominik Lieckfeldt Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

This paper investigates organization problems of large wireless sensor networks. In spite of their random deployment, nodes have to organize themselves as energy efficient as possible to avoid redundant sensor and transceiver tasks. In addition to energy awareness, the network has to guarantee complete sensor coverage and connectivity as long as possible. This paper presents a novel clustering algorithm which combines the advantages of horizontal and vertical network fragmentation by introducing a network division in a dual phase cell system. The assisting ability of adjacent cells is exploited to switch-off half of the network cells and allows implementing a self healing algorithm. We compared our developed algorithm to former covering and clustering algorithms and achieved an increased network lifetime compared with them of approximately 80%.

关键词： Clustering algorithms Wireless sensor networks Sensor phenomena and characterization Sensor systems computer networks Energy efficiency Wireless communication Surveillance Synchronization Clocks

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A Structural Architecture for HW Packet Processing

A Structural Architecture for HW Packet Processing

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IEEE Pacific Rim Conference on Communications, computers and Signal Processing

作者： Harald Widiger Stephan Kubisch Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

ISBN: (纸本)1424411890

In modern network applications and especially in Access Networks, the demands towards functionality and throughput are rising permanently. Furthermore, telecommunication carriers have different and changing requirements towards Access Network equipment. They are thus demanding a great deal of flexibility in IP-DSLAMS. To satisfy these various needs, highly flexible and particularly high performing packet processors are required. We propose an architecture for hardware modules, which joins the advantages of software and hardware solutions targeting packet processing. Our architecture provides a powerful and fast solution due to hardware implementation. Furthermore, it enables flexible and adaptive packet processors for different needs and configurations comparable to a software solution based on a network processor. This is accomplished without any overhead of unnecessary functionality and without the difficulties, which occur when it comes to adjusting pure ASIC packet processors to different tasks. Our architectural approach thus provides a good solution for packet processing.

关键词： Hardware Field programmable gate arrays Application specific integrated circuits computer architecture Throughput Ethernet networks computer networks Application software Costs microelectronics

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Energy and Coverage Aware Routing Algorithm in Self Organized Sensor Networks

Energy and Coverage Aware Routing Algorithm in Self Organize...

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International Conference on Networked Sensing Systems (INSS)

作者： Jakob Salzmann Stephan Kubisch Frank Reichenbach Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

This paper investigates the energy problem in sensor networks. After random deployment, nodes have to observe a region and transmit their sensor data to a central station. By checking redundancies in coverage and transmission with our XGAF algorithm presented here it is possible to shutdown the majority of nodes into sleep mode. Computation reduction in sleeping nodes and reduced communication results in increased network lifetime. This paper presents a novel routing algorithm which takes into account information concerning coverage and energy and using the advantages of scale free networks. Additionally, the algorithm allows nodes to work self organized. Thence, communication with the central station is reduced.

关键词： Routing computer networks Surveillance Sensor systems Robustness microelectronics Power engineering and energy Social network services IP networks Humans

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On Improving the Precision of Localization with Minimum Resource Allocation

On Improving the Precision of Localization with Minimum Reso...

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International Conference on computer Communications and Networks (ICCCN)

作者： Frank Reichenbach Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

Autonomous localization of nodes in wireless sensor networks is essential to minimize the complex self organization task and consequently enhancing the overall network lifetime. Recently, precise localization algorithms are impeded by multi path propagation of signals originated by reflections at walls or other objects in the environment. However, the localization error can be reduced by applying statistical methods that consider the mass of input information provided in large WSNs. In this paper we present the "Iterative DLS"-algorithm (iDLS), a new localization method that reduces the error of the initial position estimate by more than 46% and finally allows a precision of 3 m (fieldsize: 100 mtimes100 m) at noisy input. This is achieved by extending the known "distributed least squares"-algorithm by a refinement-phase, where sensor nodes provide their initial position to neighbors. This algorithm places an absolute minimum of computational requirement on the resource constrained sensor nodes.

关键词： Resource management Wireless sensor networks computer networks Iterative algorithms Least squares methods Global Positioning System Least squares approximation microelectronics Impedance Reflection

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Mapping a Pipelined Data Path onto a Network-on-Chip

Mapping a Pipelined Data Path onto a Network-on-Chip

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International Symposium on Industrial Embedded Systems

作者： Stephan Kubisch Claas Cornelius Ronald Hecht Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

During the last years, networks-on-chip (NoCs) have become a true alternative for the design of complex integrated systems-on-chip (SoC). Much effort has been spent for research on functionalities, mechanisms, and quality-of-service (QoS) features in NoCs. Hence, a broad and multi-faceted design space exists but leaves open, which mechanisms and design paradigms actually tip the scales for the chosen application domain. In this paper, we discuss the level of QoS needed in a specific NoC for a packet processing application. This is done in the light of preliminary investigations for the redesign of an existing packet processing system because that system's current architecture exhibits drawbacks regarding performance and further scalability. Therefore, we considered to take advantage of an NoC communication architecture. A simple NoC was developed, which knowingly omits sophisticated QoS mechanisms. Relying on the lessons, which have learned from the history and development of the Internet, we argue that a simple and plain NoC suffices for applications as the one discussed.

关键词： Network-on-a-chip Internet Scalability Field programmable gate arrays Network topology IP networks microelectronics computer networks Data engineering Design engineering

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Deep Submicron Technology: Opportunity or Dead End for Dynamic Circuit Techniques

Deep Submicron Technology: Opportunity or Dead End for Dynam...

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International Conference on VLSI Design

作者： Claas Cornelius Frank Grassert Siegmar Koppe Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany Advanced Systems and Circuits Infineon Technologies Germany

ISBN: (纸本)9780769527628;0769527620

Dynamic circuit techniques offer potential advantages over static CMOS, especially if more complex logic is to be implemented. Therefore, they are extensively used in high performance designs to speed up critical subsystems. However, the speed benefit is traded off for increased power consumption, area overhead, design effort, and reduced noise margins. The continuing process of technology scaling raises further concerns of reliability and limits the wide use of dynamic logic. This paper presents evaluations in terms of area, power dissipation, and propagation delay for several dynamic logic styles as well as for static CMOS in a 90 nm technology. The intention is to assess if dynamic circuit techniques are still an option to boost performance against the background of the issues of nanotechnology. Moreover, issues of reliability and signal integrity, gained from practical experience for different testbenches, and possible solutions are discussed. Finally, an automated design flow for dynamic logic, derived from a standard CMOS flow, is presented

关键词： CMOS logic circuits CMOS technology Energy consumption Noise reduction Circuit noise Power dissipation Propagation delay Nanotechnology Circuit testing Logic design

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DLS: A Resource-Aware Localization Algorithm with High Precision in Large Wireless Sensor Networks

DLS: A Resource-Aware Localization Algorithm with High Preci...

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Workshop on Positioning, Navigation and Communication, WPNC

作者： Frank Reichenbach Jakob Salzmann Dirk Timmermann Alexander Born Ralf Bill Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany Institute for Management of Rural Areas Chair of Geodesy and Geoinformatics University of Rostock Germany

One of the key issues in large wireless sensor networks is a precise position determination of every node with minimal hardware requirements and lowest energy consumption. Exact localization techniques, which are prone to input errors, are resource-intensive and not feasible on simple sensor nodes without adaptations. The key mechanism is to effectively split the complex computation and distribute the communication load across all nodes. Therefore, we present the "distributed least squares" (DLS)-algorithm. DLS is a resource-aware localization method that achieves 47% computation savings and 86% energy savings compared to the reference method, a "fully distributed multilateration" on every sensor node.

关键词： Wireless sensor networks computer networks Hardware Navigation Distributed computing Least squares methods Global Positioning System Least squares approximation microelectronics Geophysics computing

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