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A FPGA-based Dewavefront Array Prototype Implementing the Quadrant Interlocking Factorization Method

A FPGA-based Dewavefront Array Prototype Implementing the Qu...

引用

International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA

作者： M.Ch. Karra M.P. Bekakos Laboratory of Digital Systems Department of Electrical and Computer Engineering School of Engineering Democritus University of Thrace Xanthi Greece

The systolic processing offers the possibility of solving a large number of standard problems on multicellular computing devices with autonomous cells (processing elements - PEs). The resulting systolic arrays exploit the underlying parallelism of many computationally intensive problems and offer a vital and effective way of handling them. Advances in technology and especially in VLSI and FPGA have an ongoing contribution to the evolution of systolic and wavefront arrays. The concept of wavefront arrays differentiates from that of the systolic arrays in the following: the wavefront arrays consist of PEs with varying computation time allowed and the overall control is achieved by handshaking signals amongst the cells (instead of a common clock). Herein, a FPGA-based de(double ended) wavefront array prototype implementing the factorization stage of the quadrant interlocking factorization - QIF (Butterfly) method is presented and the corresponding time-complexities achieved are discussed

关键词： Prototypes Signal processing algorithms Systolic arrays Iterative algorithms Design engineering Parallel processing Concurrent computing Clocks Pipelines Laboratories

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Experimental Multipath Component Results from MIMO Measurements in a Microcell Urban Environment

Experimental Multipath Component Results from MIMO Measureme...

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12th European Wireless Conference 2006 - Enabling Technologies for Wireless Multimedia Communications

作者： Nikolaos D. Skentos Athanasios G. Kanatas Philip Constantinou Mobile Radio Communications Laboratory School of Electrical & Computer Engineering National Technical University of Athens Greece Department of Technology Education & Digital Systems University of Piraeus Greece

This paper presents results on the parameters of multipath components extracted from wideband measured MIMO channel matrices. Experimental data were collected with wideband channel sounding measurements at 5.2 GHz in a microcell urban environment, under line of sight propagation conditions. The double directional and propagation delay parameter values of the dominant multipaths were estimated using the multidimensional parameter estimation algorithm. The results presented provide information in the context of parametric MIMO channel characterization and refer to the number of identified waves, and focus on the path weights characteristics. Additionally, the extracted multipath estimates are used to synthesize MIMO matrices that are compared to the directly measured data.

关键词： Educational institutions

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Java-based simulator for wireless multi-hop networks using directional antennas 12

Java-based simulator for wireless multi-hop networks using d...

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12th European Wireless Conference on Enabling Technologies for Wireless Multimedia Communications, European Wireless 2006

作者： Rayess, Ghadi Tsirilakis, Ioannis Kakogiannis, Constantine G. Kalis, Antonis Kanatas, Athanassios G. Constantinou, Philip Athens Information Technology 19.5Km Markopoulo Ave. Athens19002 Greece Mobile Radio Communications Laboratory School of Electrical and Computer Engineering National Technical University of Athens 9 Iroon Polytechniou St. ZografosGR-157 73 Greece Wireless Communications Laboratory Dept. of Technology Education and Digital Systems University of Piraeus 80 Karaoli and Dimitriou St. PiraeusGR-185 34 Greece

ISBN: (纸本)9783800729616

In this work, we present an event-based simulator for wireless networks using the Java programming language. Special focus has been placed on scalability and modularity of the implementation. Indeed, the new test-bed can support easily up to 10000 nodes;at the same time the different components interact with each other with well-defined interfaces permitting separate and independent modification. Even though the simulator can be used for any ad hoc wireless network, we have concentrated on the more energy-limited and constrained sensor networks. The supported physical model includes the use of directional antennas, enabling the switching of the antennas' lobe at will and the finding of direction of arrival (DoA) of the signal. Two variants of Aloha and one CSMA are the major MAC protocols implemented. At the network layer, emphasis was given on SPEED [1] and its enhancements. Finally, the user is provided with a configuration file to set its inputs, an excel output file holding all the statistics of the simulation and an interactive GUI showing the flow of information across the sensor nodes. Finally, the simulator was tested in terms of speed and memory demands, and the results of our simulations were compared against those of other research groups.

关键词： Simulators

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MIMO channel characterization for short range fixed wireless oropagation environments

MIMO channel characterization for short range fixed wireless...

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作者： Skentos, Nikolaos D. Kanatas, Athanasios G. Dallas, Panagiotis I. Constantinou, Philip Mobile Radio Communications Laboratory School of Electrical and Computer Engineering National Technical University of Athens 9 Heroon Polytechniou St. Zografou GR 15773 Athens Greece Department of Technology Education and Digital Systems University of Piraeus 80 Karaoli and Dimitriou St. 18534 Piraeus Greece Emerging Technologies and Markets INTRACOM Hellenic Telecommunications and Electronics Industry S.A. Markopoulo Avenue 19002 Peania Attica Greece Mobile Radio Communications Laboratory NTUA IST STINGRAY Project National Technical Chamber of Greece Department of Technology Education and Digital Systems University of Piraeus IEEE Technical Chamber of Greece INTRACOM Advanced Communications Technologies Branch Emerging Technologies and Markets Department National Technical University of Athens Mobile Radio Communications Laboratory

This paper reports results from wideband MIMO measurements performed in short range fixed wireless environments at 5.2 GHz. The objective is to provide MIMO channel characterization results for the measured environments and contribute to the limited available similar studies. Two kinds of propagation scenarios are investigated, rooftop to rooftop and street to rooftop, at three different sites always under LOS propagation conditions. The analysis of measurement data is performed in the context of non physical modeling, providing insight into the statistics of the measured channels. In particular, the slow time varying nature of the channel is studied and the narrow Doppler spectrum shape is approximated. Furthermore, frequency correlation results are obtained and the typical delay dispersion measures are extracted. Then, the antenna correlation is studied and the error of the Kronecker product approximation is evaluated. Finally, capacity results are provided and the channel measurements are characterized in terms of spatial multiplexing quality and multipath richness through condition number analysis. © Springer 2006.

关键词： Wireless telecommunication systems

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Java-based simulator for wireless multi-hop networks using directional antennas

Java-based simulator for wireless multi-hop networks using d...

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12th European Wireless Conference 2006 - Enabling Technologies for Wireless Multimedia Communications

作者： Ghadi Rayess Ioannis Tsirilakis Constantine G. Kakogiannis Antonis Kalis Athanassios G. Kanatas Philip Constantinou Athens Information Technology 19.5Km Markopoulo Ave. 19002 Greece Mobile Radio Communications Laboratory School of Electrical and Computer Engineering National Technical University of Athens 9 Iroon Polytechniou St. Zografos GR-157 73 Greece. Wireless Communications Laboratory Dept. of Technology Education & Digital Systems University of Piraeus 80 Karaoli & Dimitriou St. Piraeus GR-185 34 Greece

In this work, we present an event-based simulator for wireless networks using the Java programming language. Special focus has been placed on scalability and modularity of the implementation. Indeed, the new test-bed can support easily up to 10000 nodes; at the same time the different components interact with each other with well-defined interfaces permitting separate and independent modification. Even though the simulator can be used for any ad hoc wireless network, we have concentrated on the more energy-limited and constrained sensor networks. The supported physical model includes the use of directional antennas, enabling the switching of the antennas' lobe at will and the finding of direction of arrival (DoA) of the signal. Two variants of Aloha and one CSMA are the major MAC protocols implemented. At the network layer, emphasis was given on SPEED and its enhancements. Finally, the user is provided with a configuration file to set its inputs, an excel output file holding all the statistics of the simulation and an interactive GUI showing the flow of information across the sensor nodes. Finally, the simulator was tested in terms of speed and memory demands, and the results of our simulations were compared against those of other research groups.

关键词： Topology Baseband

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Low power design of multipliers using a full-adder isolation technique

Low power design of multipliers using a full-adder isolation...

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12th IEEE International Conference on Electronics, Circuits and systems, ICECS 2005

作者： Anagnostopoulos, K. Economakos, G. National Technical University of Athens School of Electrical and Computer Engineering Microprocessors and Digital Systems Laboratory Iroon Polytexneiou 9 15780 Zografou Greece

ISBN: (纸本)9789972611001

In this paper a new technique for the design of combinational circuits for low power is introduced. According to this technique, we bypass blocks of logic when their function is not required, using low delay and area overhead components (transmission gates). The internal state of these blocks is kept unchanged, so the switching activity of the circuit is minimized, resulting to low power consumption. The proposed idea is applied in the design of a carry-save array multiplier with significant power saving.

关键词： Design

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Lowpower design of multipliers using a full-adder isolation technique

Lowpower design of multipliers using a full-adder isolation ...

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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： K. Anagnostopoulos G. Economakos School of Electrical and Computer Engineering Microprocessors and Digital Systems Laboratory National and Technical University of Athens Zografou Greece

关键词： Arrays computer architecture Radiation detectors Logic gates microprocessors Adders Power demand

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Verification of computer display pre-compensation for visual aberrations in an artificial eye

Verification of computer display pre-compensation for visual...

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ASSETS 2005 - The Seventh International ACM SIGACCESS Conference on computers and Accessibility

作者： Alonso Jr., Miguel Barreto, Armando Jacko, Julie A. Adjouadi, Malek Digital Signal Processing Laboratory Florida International University Miami FL 33174 United States Electrical and Computer Engineering Florida International University Miami FL 33174 United States School of Industrial and Systems Engineering Georgia Institute of Technology Atlanta GA 30332 United States

ISBN: (纸本)1595931597

The possibility of pre-compensating images in a computer display according to the visual aberrations previously assessed in an optical system (e.g., the computer user's eye) has been confirmed for a simple "artificial eye". This device has been constructed from optical components, which include a plano-convex lens, an adjustable aperture, and a Charged-Couple Device (CCD) array that mimics the retina of a real eye. While the CCD array allows for the inspection of the image as it would form on the retina of a real eye, its specular reflection does not allow the resulting "artificial eye" to be measured appropriately in a wavefront analyzer (a necessary pre-requisite for the image precompensation process). Therefore, an alternative, interchangeable CCD array covered with gray paint (i.e., disabled) was also created to provide the diffuse reflectivity that is presumed in the operation of the wavefront analyzer. Experiments with this system show that the visual aberrations in a properly characterized optical system can, in fact, be precompensated by the methods proposed by Alonso et al., [1]. These same experiments, however, reveal the need to adjust the precompensation method according to the effective pupil diameter in the system during viewing.

关键词： computer graphics

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VLab: An environment for teaching behavioral modeling 5th

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5th International Conference on Intelligent Tutoring systems, ITS 2000

作者： Tzafestas, Elpida S. Prokopiou, Platon A. Institute for Communication and Computer Systems Electrical and Computer Engineering Department National Technical University of Athens Zographou Campus Athens15773 Greece Digital Art Laboratory Athens School of Fine Arts Peiraios 256 Agios Ioannis Rentis18233 Greece

ISBN: (纸本)3540676554

Within the framework of a master in digital art, we have developed a set of educational tools for artificial life and the complexity sciences. These software tools constitute a laboratory curriculum that is used to supplement the theoretical courses on the subject and contain, among other things, an educational tool for behavioral modeling (VLab).

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COMPETITIVE LEARNING IN ASYNCHRONOUS PULSE DENSITY INTEGRATED-CIRCUITS

COMPETITIVE LEARNING IN ASYNCHRONOUS PULSE DENSITY INTEGRATE...

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INTERNATIONAL SYMP ON CIRCUITS AND systems ( ISCAS 92 )

作者： WATOLA, D GEMBALA, D MEADOR, J School of Electrical Engineering and Computer Science Washington State University Pullman 99164-2752 WA United States Digital Systems Research Group Jet Propulsion Laboratory M/S 238-420 4800 Oak Grove Drive Pasadena 91109-8099 CA United States

ISBN: (纸本)0780305930

This paper introduces a MOS circuit for the integrated implementation of pulse-coded comptetitive learning. The specific focus is upon an adaptive synapse cell which combines a capacitive analog storage element with subthreshold adaptation circuitry. The adaptation circuitry is designed to compensate for nonlinear device transconductance in the subthreshold operating region. The simulations presented verify circuit operation in a 2-input-3-output competitive network. Accurate clustering of random training data is demonstrated. © 1992 IEEE.

关键词： Analog storage

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