@misc{10648, author = {{Döhre, Sven}}, publisher = {{Paderborn University}}, title = {{{Entwurf und Implementierung einer RocketIO-basierten Kommunikationsschnittstelle für Multi-FPGA Systeme}}}, year = {{2007}}, } @inproceedings{10689, author = {{Kaufmann, Paul and Platzner, Marco}}, booktitle = {{Architecture of Computing Systems (ARCS)}}, pages = {{199--208}}, publisher = {{Springer}}, title = {{{Toward Self-adaptive Embedded Systems: Multi-objective Hardware Evolution}}}, volume = {{4415}}, year = {{2007}}, } @misc{10709, author = {{Meiche, Robert}}, publisher = {{Paderborn University}}, title = {{{VHDL-Implementierung eines Clustering-Verfahrens für multikriterielle Optimierungsalgorithmen}}}, year = {{2007}}, } @misc{10728, author = {{Reisch, Waldemar}}, publisher = {{Paderborn University}}, title = {{{Bildverarbeitungs-Architekturen und -Bibliotheken für das rekonfigurierbare Betriebssystem ReconOS}}}, year = {{2007}}, } @misc{10729, author = {{Rethmeier, Eike}}, publisher = {{Paderborn University}}, title = {{{Konzeption und Implementierung einer Microsoft Windows CE 5.0 Plattform für ein ARM-basiertes eingebettetes Rechnersystem}}}, year = {{2007}}, } @inproceedings{10735, author = {{Schumacher, Tobias and Lübbers, Enno and Kaufmann, Paul and Platzner, Marco}}, booktitle = {{Proceedings of the ParaFPGA Symposium, International Conference on Parallel Computing: Architectures, Algorithms and Applications (PARCO)}}, pages = {{749--756}}, publisher = {{IOS Press}}, title = {{{Accelerating the Cube Cut Problem with an FPGA-Augmented Compute Cluster}}}, volume = {{15}}, year = {{2007}}, } @inproceedings{11720, author = {{Bevermeier, Maik and Ebel, Tobias and Haeb-Umbach, Reinhold}}, booktitle = {{Multi-Carrier Spread Spectrum 2007}}, title = {{{Channel Estimation by Exploiting Sublayer Information in OFDM Systems}}}, year = {{2007}}, } @inproceedings{11722, author = {{Bevermeier, Maik and Haeb-Umbach, Reinhold}}, booktitle = {{Multi-Carrier Spread Spectrum 2007}}, title = {{{Combined Time and Frequency Domain OFDM Channel Estimation}}}, year = {{2007}}, } @inproceedings{11785, abstract = {{In this paper we present a novel channel impulse response estimation technique for block-oriented OFDM transmission based on combining estimators: the estimates provided by a Kalman filter operating in the time domain and a Wiener filter in the frequency domain are optimally combined by taking into account their estimated error covariances. The resulting estimator turns out to be identical to the MAP estimator of correlated jointly Gaussian mean vectors. Different variants of the proposed scheme are experimentally investigated in an EEEE 802.11a-like system setup. They compare favourably with known approaches from the literature resulting in reduced mean square estimation error and bit error rate. Further, robustness and complexity issues are discussed}}, author = {{Haeb-Umbach, Reinhold and Bevermeier, Maik}}, booktitle = {{IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2007)}}, keywords = {{bit error rate, block-oriented OFDM transmission, channel estimation, channel impulse response estimation, combining estimators, error statistics, frequency domain estimation, Gaussian mean vectors, Gaussian processes, Kalman filter, Kalman filters, MAP estimator, maximum likelihood estimation, OFDM channel estimation, OFDM modulation, time domain estimation, time-frequency analysis, Wiener filter, Wiener filters}}, pages = {{III--277--III--280}}, title = {{{OFDM Channel Estimation Based on Combined Estimation in Time and Frequency Domain}}}, doi = {{10.1109/ICASSP.2007.366526}}, volume = {{3}}, year = {{2007}}, } @article{11799, abstract = {{In this paper, we propose a novel similarity measure to be used for localizing mobile terminals by comparing measured signal power levels with a database of predictions. The proposed measure provides the possibility to incorporate inherent information about signal power level measurements requested by the serving base station but not reported by the mobile terminal. Increased positioning accuracy was observed both in simulations and with real field data}}, author = {{Haeb-Umbach, Reinhold and Peschke, Sven}}, journal = {{IEEE Transactions on Vehicular Technology}}, keywords = {{cellular phone positioning, cellular radio, measured signal power levels, mobile handsets, mobility management (mobile radio)}}, number = {{1}}, pages = {{368--372}}, title = {{{A Novel Similarity Measure for Positioning Cellular Phones by a Comparison With a Database of Signal Power Levels}}}, doi = {{10.1109/TVT.2006.889563}}, volume = {{56}}, year = {{2007}}, } @inproceedings{11822, author = {{Ion, Valentin and Haeb-Umbach, Reinhold}}, booktitle = {{Interspeech 2007}}, title = {{{Multi-Resolution Soft Features for Channel-Robust Distributed Speech Recognition}}}, year = {{2007}}, } @inproceedings{11883, abstract = {{In this paper, we experimentally evaluate algorithms for velocity estimation of a GSM 900 mobile terminal which are based on the analysis of the statistical properties of the fast fading process. It is shown how theses statistics can be obtained from the training sequences present in downlink transmission bursts without establishing an active connection. Realistic simulations of a GSM channel according to the COST 207 channel models have been conducted. These models incorporate effects like multipath propagation, fading, cochannel interference and additive noise. It is shown that velocity estimation by searching for the maximum slope of the power density spectrum of the fast fading performs best.}}, author = {{Peschke, Sven and Haeb-Umbach, Reinhold}}, booktitle = {{4th Workshop on Positioning Navigation and Communication (WPNC 2007)}}, keywords = {{additive noise, cellular radio, channel estimation, cochannel interference, COST 207 channel models, downlink transmission bursts, fading channels, fading process, GSM downlink signalling, mobile terminals, multipath channels, multipath propagation, power density spectrum, statistical analysis, statistical properties, telecommunication links, telecommunication terminals, velocity estimation}}, pages = {{217--222}}, title = {{{Velocity Estimation of Mobile Terminals by Exploiting GSM Downlink Signalling}}}, doi = {{10.1109/WPNC.2007.353637}}, year = {{2007}}, } @article{11927, abstract = {{Maximizing the output signal-to-noise ratio (SNR) of a sensor array in the presence of spatially colored noise leads to a generalized eigenvalue problem. While this approach has extensively been employed in narrowband (antenna) array beamforming, it is typically not used for broadband (microphone) array beamforming due to the uncontrolled amount of speech distortion introduced by a narrowband SNR criterion. In this paper, we show how the distortion of the desired signal can be controlled by a single-channel post-filter, resulting in a performance comparable to the generalized minimum variance distortionless response beamformer, where arbitrary transfer functions relate the source and the microphones. Results are given both for directional and diffuse noise. A novel gradient ascent adaptation algorithm is presented, and its good convergence properties are experimentally revealed by comparison with alternatives from the literature. A key feature of the proposed beamformer is that it operates blindly, i.e., it neither requires knowledge about the array geometry nor an explicit estimation of the transfer functions from source to sensors or the direction-of-arrival.}}, author = {{Warsitz, Ernst and Haeb-Umbach, Reinhold}}, journal = {{IEEE Transactions on Audio, Speech, and Language Processing}}, keywords = {{acoustic signal processing, arbitrary transfer function, array signal processing, blind acoustic beamforming, direction-of-arrival, direction-of-arrival estimation, eigenvalues and eigenfunctions, generalized eigenvalue decomposition, gradient ascent adaptation algorithm, microphone arrays, microphones, narrowband array beamforming, sensor array, single-channel post-filter, spatially colored noise, transfer functions}}, number = {{5}}, pages = {{1529--1539}}, title = {{{Blind Acoustic Beamforming Based on Generalized Eigenvalue Decomposition}}}, doi = {{10.1109/TASL.2007.898454}}, volume = {{15}}, year = {{2007}}, } @inproceedings{11934, author = {{Warsitz, Ernst and Haeb-Umbach, Reinhold and Tran Vu, Dang Hai}}, booktitle = {{Interspeech 2007}}, title = {{{Blind Adaptive Principal Eigenvector Beamforming for Acoustical Source Separation}}}, year = {{2007}}, } @inproceedings{11941, author = {{Windmann, Stefan and Haeb-Umbach, Reinhold}}, booktitle = {{Interspeech 2007}}, title = {{{An Approach to Iterative Speech Feature Enhancement and Recognition}}}, year = {{2007}}, } @inproceedings{12051, author = {{Sommer, Christoph and Dressler, Falko}}, booktitle = {{2007 IEEE 66th Vehicular Technology Conference}}, isbn = {{9781424402632}}, title = {{{The DYMO Routing Protocol in VANET Scenarios}}}, doi = {{10.1109/vetecf.2007.20}}, year = {{2007}}, } @article{12941, author = {{Kepper, Johannes and Röwenstrunk, Daniel}}, journal = {{Forum Musikbibliothek}}, keywords = {{Edirom, ViFE}}, number = {{1}}, pages = {{36--49}}, title = {{{Das Edirom-Projekt. Werkzeuge für digitale Formen wissenschaftlich-kritischer Musikeditionen}}}, volume = {{28}}, year = {{2007}}, } @misc{15335, author = {{Henning, Bernd}}, title = {{{Liquid analysis using acoustical sensors}}}, year = {{2007}}, } @misc{15336, abstract = {{Ultraschallsensoren werden heute in der industriellen Messtechnik vielfach eingesetzt, zum Beispiel für die Durchflussmessung, Füllstandmessung, Konzentrationsanalyse, zerstörungsfreie Werkstoffdiagnostik und anderes mehr. Dabei wachsen die Anforderungen hinsichtlich der zu gewährleistenden Messunsicherheit, der Zuverlässigkeit sowie einer erweiterter Funktionalität ständig. Erreichen lassen sich diese Ziele natürlich nur mit Hilfe verbesserter Ultraschallsensoren und optimal gestalteter Messanordnungen. Die permanente Forderung, die Produktentwicklungszeiten sowie die Produktherstellungskosten deutlich zu minimieren, macht den Einsatz moderner Entwicklungswerkzeuge für das Sensordesign unumgänglich. }}, author = {{Henning, Bernd}}, pages = {{40--42}}, title = {{{Schallfeldsimulation für die Ultraschallmesstechnik}}}, year = {{2007}}, } @inproceedings{15337, abstract = {{The continuous measurement of rheological properties (density and viscosity) or material properties (concentration of selected substances) of liquid mixtures in the chemical industry or in the food industry is a great challenge to this day. Standard chemical sensors are often not suitable for industrial processes because of their slow sensor response and their limited robustness due to the direct contact to process media. Ultrasonic sensor systems meet the practical requirements of a chemical sensor quite well. Current ultrasonic sensor systems are already widely used as acoustic chemical sensors to measure concentration of selected substances or to monitor the course of polymerization, crystallization or fermentation processes. Useable acoustic properties for the characterization of liquid mixtures are sound velocity, sound absorption and acoustic impedance in consideration of temperature. This contribution will give a short overview of the state of the art and several trends for the use of ultrasonic sensor systems in process applications. Currently there are many activities to use acoustic waveguides for above mentioned sensor applications. By means of two selected examples (density measurement and determination of acoustic properties of highly absorbing synthetic polymers) it will presented new developed measurement principles using acoustic waveguides.}}, author = {{Henning, Bernd and Rautenberg, Jens}}, location = {{Wien}}, title = {{{Acoustical waveguides for sensor applications}}}, year = {{2007}}, }