@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}}, } @misc{34780, author = {{Süßmann, Johannes}}, booktitle = {{sehepunkte}}, keywords = {{Karl V., Historiographiegeschichte, Gedenken}}, number = {{4}}, title = {{{[Rez. v.] C. Scott Dixon/Martina Fuchs (Hg.): The Histories of Emperor Charles V [...]. Münster. Aschendorff 2005}}}, volume = {{7}}, year = {{2007}}, } @article{6087, abstract = {{Visual backward masking is frequently used to study the temporal dynamics of visual perception. These dynamics may include the temporal features of conscious percepts, as suggested, for instance, by the asynchronous-updating model (Neumann, 1982) and perceptual-retouch theory (Bachmann, 1994). These models predict that the perceptual latency of a visual backward mask is shorter than that of a like reference stimulus that was not preceded by a masked stimulus. The prediction has been confirmed by studies using temporal-order judgments: For certain asynchronies between mask and reference stimulus, temporal-order reversals are quite frequent (e.g. Scharlau, & Neumann, 2003a). However, it may be argued that these reversals were due to a response bias in favour of the mask rather than true temporal-perceptual effects. I introduce two measures for assessing latency effects that (1) are not prone to such a response bias, (2) allow to quantify the latency gain, and (3) extend the perceptual e}}, author = {{Scharlau, Ingrid}}, issn = {{1895-1171}}, journal = {{Advances in Cognitive Psychology}}, keywords = {{temporal processes, prime mask interaction, perceptual consequences, masked information, visual backward masking, visual perception, Temporal Lobe, Visual Masking, Visual Perception, Consequence}}, number = {{1-2}}, pages = {{241 -- 255}}, title = {{{Temporal processes in prime-mask interaction: Assessing perceptual consequences of masked information.}}}, volume = {{3}}, year = {{2007}}, } @article{6070, abstract = {{The Fehrer-Raab effect (simple reaction time is unaffected by metacontrast masking of the test stimulus) seems to imply that a stimulus can trigger a voluntary reaction without reaching a conscious representation. However, it is also possible that the mask triggers the reaction, and that the masked test stimulus causes a focussing of attention from which processing of the mask profits, thus reaching conscious representation earlier. This is predicted by the Weather Station Model of visual masking. Three experiments tested this explanation. Experiment 1 showed that the masked test stimulus caused a temporal shift of the mask. Experiment 2 showed that the reaction in the Fehrer-Raab effect was not exclusively triggered by a conscious representation of the test stimulus: the mask was involved in evoking the reaction. Experiment 3 again revealed a temporal shift of the mask. However, the shift was only about half as large as the Fehrer-Raab effect. The psychometric functions suggested tha}}, author = {{Neumann, Odmar and Scharlau, Ingrid}}, issn = {{0340-0727}}, journal = {{Psychological Research}}, keywords = {{Fehrer-Raab effect, Weather Station Model, visual backward masking, reaction time, metacontrast masking, conscious representation, Cognition, Humans, Perceptual Masking, Pilot Projects, Psychology, Experimental, Psychometrics, Reaction Time, Visual Perception, Models, Reaction Time, Visual Contrast, Visual Masking}}, number = {{6}}, pages = {{667 -- 677}}, title = {{{Experiments on the Fehrer-Raab effect and the 'Weather Station Model' of visual backward masking.}}}, volume = {{71}}, year = {{2007}}, } @article{6093, abstract = {{The U-shaped metacontrast function may result from the superimposition of two monotonic components which reflect the effects of mechanisms similar to the peripheral and central processes suggested for backward pattern masking by Turvey (Psychol Rev 80:1-52, 1973). In an experiment using the disc-ring paradigm, it was demonstrated that the decreasing and increasing branches of the metacontrast function are differently affected by the exposure duration of the mask and a task-irrelevant stimulus (distractor) appearing in the contralateral visual hemifield. The phenomenal representation of masking is different for the two parts of the curve. It is suggested that masking in the second part of the masking function, but not in the first, is related to the control of visual attention. (PsycINFO Database Record (c) 2016 APA, all rights reserved)}}, author = {{Neumann, Odmar and Scharlau, Ingrid}}, issn = {{0340-0727}}, journal = {{Psychological Research}}, keywords = {{visual attention, metacontrast, backward pattern masking, monotonic components superimposition, Attention, Contrast Sensitivity, Humans, Judgment, Perceptual Masking, Visual Perception, Metacognition, Visual Contrast, Visual Attention, Visual Masking}}, number = {{6}}, pages = {{626 -- 633}}, title = {{{Visual attention and the mechanism of metacontrast.}}}, volume = {{71}}, year = {{2007}}, } @article{6079, abstract = {{The present paper reviews recent research on perceptual latency priming (PLP). PLP is the relative latency advantage--earlier perception--of a visual stimulus that is preceded by another, masked stimulus at its location. The first stimulus attracts attention which accelerates perception of the second stimulus. This facilitation arises even if the first stimulus is visually backward-masked by the second one. The paper summarises research on temporal and spatial properties of PLP and the question whether intentions mediate shifts of attention to external events. Possible sources of PLP besides visuo-spatial attention are discussed. Finally, I give a review of feedforward and reentrant models of PLP and compare them to the empirical evidence. (PsycINFO Database Record (c) 2016 APA, all rights reserved)}}, author = {{Scharlau, Ingrid}}, issn = {{0340-0727}}, journal = {{Psychological Research}}, keywords = {{perceptual latency priming, attentional facilitation, visuospatial attention, visual backward masking, prior entry, Attention, Humans, Judgment, Reaction Time, Space Perception, Attention, Priming, Response Latency, Visual Masking, Visuospatial Ability}}, number = {{6}}, pages = {{678 -- 686}}, title = {{{Perceptual latency priming: A measure of attentional facilitation.}}}, volume = {{71}}, year = {{2007}}, } @article{32514, abstract = {{The fact that there is a specific age marking the emergence of adulthood in the United States has been well documented. The starting point for the studies included in this special issue is the assumption that the same can be said for European countries. Thus, a comparison of characteristics of emerging adulthood between different European countries was performed. In this special issue, contributions of scholars from five different European countries are taken as representative of different regions: Spain, Italy, Finland, Germany, and the Czech Republic. The efforts of the research are twofold. The first is to look at how the traditional markers of adulthood have changed and how the concept of adulthood is seen in the different countries. The second is to highlight the influence that the entrance into the working world and romantic partnership have on emerging adults and to detect the impact of the timing of entering adulthood on identity achievement. The results are presented here as different pathways that emerging adults follow to reach the same goal of mature adulthood.}}, author = {{Buhl, Heike M. and Lanz, Margherita}}, journal = {{Journal of Adolescent Research}}, number = {{5}}, pages = {{439 -- 443}}, title = {{{Emerging adulthood in Europe. Common traits and variability across five European countries}}}, doi = {{https://doi.org/10.1177/0743558407306345}}, volume = {{22}}, year = {{2007}}, } @article{48826, author = {{Hartung, Olaf}}, issn = {{2366-2700}}, journal = {{Zeitgeschichte-online}}, publisher = {{Clio-online - Historisches Fachinformationssystem e.V.}}, title = {{{Dingwelten zwischen Ästhetik und Erkenntnis. Zur Dauerausstellung des Deutschen Historischen Museums}}}, volume = {{2007-7-1}}, year = {{2007}}, } @misc{47687, author = {{Brieden, Benedikt}}, keywords = {{Diplomarbeit}}, title = {{{Analyse von verallgemeinerten RSA Polynomen mit Hilfe der Coppersmithschen Methode}}}, year = {{2007}}, } @misc{47689, author = {{Kuntze, Daniel}}, keywords = {{Diplomarbeit}}, title = {{{Untersuchung von Clusteringalgorithmen für die Kullback-Leibler Divergenz}}}, year = {{2007}}, } @misc{47686, author = {{Borghoff, Julia}}, keywords = {{Diplomarbeit}}, title = {{{Vergleich multivariater Varianten der Methode von Coppersmith}}}, year = {{2007}}, } @misc{2887, author = {{Landwehr, Andreas Cord}}, title = {{{Untersuchungen zur Sicherheit einzelner RSA Bits}}}, year = {{2007}}, }