@inproceedings{40888, abstract = {{A complex random vector is called improper if it is correlated with its complex conjugate. In this paper, we present a generalized likelihood ratio test (GLRT) for impropriety. This test is compelling because it displays the right invariances: The proposed GLR is invariant to linear transformations on the data, including rotation and scaling, just as propriety is preserved by linear transformations. Because canonical correlations make up a complete, or maximal, set of invariants for the Hermitian and complementary covariance matrices under linear transformations, the GLR can be shown to be a function of the squared canonical correlations between the data and its complex conjugate. This validates our intuition that the internal coordinate system should not matter for this hypothesis test}}, author = {{Schreier, Peter J. and Scharf, Louis L. and Hanssen, Alfred}}, booktitle = {{Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}}, pages = {{796–799}}, title = {{{A Statistical Test for Impropriety of Complex Random Signals}}}, doi = {{10.1109/ICASSP.2006.1660774}}, volume = {{3}}, year = {{2006}}, } @article{40890, abstract = {{A new suboptimal algorithm for detection of constant modulus signals in multiple-input multiple-output (MIMO) channels is presented. The deviation of the solution from the desired constant modulus property is used as a penalty or regularization term in the conventional least squares cost function, and an iterative reweighted least squares (IRWLS) procedure is used to minimize the regularized functional.}}, author = {{Ramírez, D. and Santamaría, I.}}, journal = {{Electr. Lett.}}, number = {{3}}, pages = {{184–186}}, title = {{{Regularised approach to detection of constant modulus signals in MIMO channels}}}, doi = {{10.1049/el:20063870}}, volume = {{42}}, year = {{2006}}, } @inproceedings{40889, abstract = {{Clipping is applied to superposition coding systems to reduce the peak-to-average power ratio (PAPR) of the transmitted signal. The performance limit is investigated through evaluating the mutual information driven by the induced peak-power-limited input signals. It is shown that the channel capacity can be approached by clipped superposition coding systems. To alleviate the performance degradation due to clipping noises, we develop a soft compensation algorithm that is combined with soft-input-soft-output (SISO) decoding algorithms in an iterative manner. Simulation results show that with the proposed algorithm, most performance loss can be recovered.}}, author = {{Tong, Jun and Ping, Li}}, booktitle = {{6th\ Int.\ Symp.\ Turbo Codes & Rel.\ Top.}}, pages = {{1–6}}, title = {{{Iterative decoding of superposition coding}}}, year = {{2006}}, } @article{40376, author = {{Haller, Melanie}}, journal = {{In: Robert Gugutzer (ed.): Body Turn, Bielefeld, S. 233-249 (zusammen mit Gabriele Klein)}}, title = {{{Präsenzeffekte. Zum Verhältnis von Bewegung und Sprache am Beispiel lateinamerikanischer Tänze}}}, year = {{2006}}, } @article{14952, author = {{Sureth-Sloane, Caren and Halberstadt, Alexander}}, journal = {{FinanzBetrieb}}, number = {{11}}, pages = {{677--685}}, title = {{{Mitarbeiterbeteiligungen durch Genussrechte und stille Beteiligungen - steuerliche und finanzwirtschaftliche Aspekte}}}, volume = {{8}}, year = {{2006}}, } @article{14950, author = {{Maiterth, Ralf and Sureth-Sloane, Caren}}, journal = {{Betriebswirtschaftliche Forschung und Praxis}}, number = {{3}}, pages = {{225--245}}, title = {{{Unternehmensfinanzierung, Unternehmensrechtsform und Besteuerung}}}, volume = {{58}}, year = {{2006}}, } @article{41286, author = {{Bauer, Matthias and Gastl, Christoph and Köppl, Christoph and Kickelbick, Guido and Bertagnolli, Helmut}}, issn = {{0026-9247}}, journal = {{Monatshefte für Chemie - Chemical Monthly}}, keywords = {{General Chemistry}}, number = {{5}}, pages = {{567--581}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{EXAFS Spectroscopy of the Alkoxide Precursor Zr(OnBu)4 and its Modification in Solution}}}, doi = {{10.1007/s00706-006-0450-z}}, volume = {{137}}, year = {{2006}}, } @inbook{20232, author = {{Rohlfing, Katharina and Fritsch, Jannik and Wrede, Britta and Jungmann, Tanja}}, booktitle = {{Advanced Robotics}}, pages = {{1183--1199}}, title = {{{How can multimodal cues from child-directed interaction reduce learning complexity in robots?}}}, doi = {{10.1163/156855306778522532}}, volume = {{20}}, year = {{2006}}, } @article{17290, abstract = {{Forty Polish children aged between 1;8 and 2;3 were trained over two training sessions In the comprehension of the preposition POD [UNDER]. In the experiment, two variables were manipulated: a within Subjects variable of SITUATION and a between subjects variable of LINGUISTIC INPUT. The effect of situation could be found in all trained groups, showing that children's understanding in familiar and transfer Situations differed significantly from the performance of the control group in the post-test. The results further Suggest that depending on the type of a situation, the linguistic task requires different word learning abilities from a child.}}, author = {{Rohlfing, Katharina}}, issn = {{1469-7602}}, journal = {{Journal of Child Language}}, number = {{01}}, pages = {{51--69}}, publisher = {{CAMBRIDGE UNIV PRESS}}, title = {{{Facilitating the acquisition of UNDER by means of IN and ON - a training study in Polish}}}, doi = {{10.1017/S0305000905007257}}, volume = {{33}}, year = {{2006}}, } @inbook{40449, author = {{Grotjahn, Rebecca and Heitmann, Christin}}, booktitle = {{Louise Farrenc und die Klassik-Rezeption in Frankreich}}, editor = {{Grotjahn, Rebecca and Heitmann, Christin}}, isbn = {{9783814209647}}, pages = {{5–11}}, publisher = {{BIS-Verlag}}, title = {{{Einleitung}}}, volume = {{2}}, year = {{2006}}, } @inproceedings{40883, abstract = {{We develop a causal filter bank implementation of the cyclic Wiener filter for periodically correlated (PC, or cyclostationary) time series. By converting the PC time series into a vector-valued wide-sense stationary (WSS) time series, we may utilize the existing literature on factorization of spectral density matrices. However, because PC analytic and equivalent baseband signals are generally improper, spectral factorization algorithms must be modified for the improper case. Then, given the spectral density matrix for the equivalent WSS vector process, a causal cyclic Wiener filter can be implemented as a multirate filter bank or an equivalent polyphase structure.}}, author = {{Spurbeck, Mark S. and Schreier, Peter J. and Scharf, Louis L.}}, booktitle = {{Proc. 40th\ Asilomar Conf.\ Signals Syst.\ Computers}}, pages = {{1425–1429}}, title = {{{Causal cyclic Wiener filtering}}}, doi = {{10.1109/ACSSC.2006.354993}}, year = {{2006}}, } @inproceedings{40884, abstract = {{Hardware platforms and testbeds are an essential tool to evaluate, in realistic scenarios, the performance of Multiple-Input-Multiple-Ouput (MIMO) systems. In this work we present a simple and easily reconfigurable $2 \times 2$ MIMO testbed for the rapid prototyping of the signal processing baseband functions. The signal generation module consists of a host PC equipped with a board that contains two high performance 100 MHz DACs and a 1 GB memory module that allows the transmission of extremely large frames of data. At the receiver side, we use another host PC equipped with two 105 MHz ADCs, another 1 GB memory module and a trigger that starts the acquisition process when the presence of signal is detected. The platform has been designed to operate at the ISM band of 2.4 GHz with a RF bandwidth of 20 MHz. In order to minimize the number of DAC and ADC circuits, signals are generated and acquired at an IF of 15 MHz. Upconversion to RF is performed with two RF vectorial signal generators (Agilent E4438C) and downconversion with two specific circuits designed from commercial components. Transmitter and receiver signal processing functions are implemented off-line in Matlab. To illustrate the performance and capabilities of the platform, we present the results of two experiments of a $2 \times 2$ MIMO transmission with Alamouti coding.}}, author = {{Ramírez, D. and Santamaría, I. and Pérez, J. and Vía, J. and Tazón, A. and Garcia-Naya, J. A. and Fernandez-Carames, T. M. and Lopez, M. Gonzalez and Iglesias, H. J. Pérez and Castedo, L.}}, booktitle = {{Proc. Int. Symp. on Wireless Comm. Systems}}, title = {{{A flexible testbed for the rapid prototyping of MIMO baseband modules}}}, doi = {{10.1109/ISWCS.2006.4362407}}, year = {{2006}}, } @article{40882, abstract = {{Even though higher-order spectral analysis is by now a mature field, complex signals are still not routinely used, as they are in second-order analysis. The reason is the complexity of the complex case: nth order moment functions of a complex signal can be defined in 2 n different ways, depending on the placement of complex conjugate operators. It is demonstrated that only a few of these different moments are required for a complete nth order description. Properties of nth order moments and spectra with different conjugation patterns are investigated. For the special case of analytic signals, it is shown how spectra with different conjugation patterns provide different information about the signal. Both energy and power signals and deterministic and stochastic signals are discussed. A major focus lies on extending results from continuous-time signals to their sampled versions. Such an extension is not straightforward due to a phenomenon called higher-order or dimension-reduction aliasing. It is demonstrated why spectra of sampled nonstationary signals may suffer from dimension-reduction aliasing unless they are sufficiently oversampled.}}, author = {{Schreier, Peter J. and Scharf, Louis L.}}, journal = {{Signal Process.}}, number = {{11}}, pages = {{3321–3333}}, title = {{{Higher-order spectral analysis of complex signals}}}, doi = {{10.1016/j.sigpro.2006.02.027}}, volume = {{86}}, year = {{2006}}, } @article{40885, abstract = {{A complex random vector is called improper if it is correlated with its complex conjugate. We present a hypothesis test for impropriety based on a generalized likelihood ratio (GLR). This GLR is invariant to linear transformations on the data, including rotation and scaling, because propriety is preserved by linear transformations. More specifically, we show that the GLR is a function of the squared canonical correlations between the data and their complex conjugate. These canonical correlations make up a complete, or maximal, set of invariants for the Hermitian and complementary covariance matrices under linear, but not widely linear, transformation}}, author = {{Schreier, Peter J. and Scharf, Louis L. and Hanssen, Alfred}}, journal = {{IEEE Signal Process.\ Lett.}}, number = {{7}}, pages = {{433–436}}, title = {{{A generalized likelihood ratio test for impropriety of complex signals}}}, doi = {{10.1109/LSP.2006.871858}}, volume = {{13}}, year = {{2006}}, } @inproceedings{40886, abstract = {{This paper presents a peak-power-limited superposition coding scheme based on clipping. A low-complexity soft compensation algorithm (SCA) for combating the clipping effect is investigated. It can be easily combined with soft-input soft-output (SISO) decoding algorithms in an iterative manner. Various numerical results show that the SCA can effectively mitigate the performance loss due to clipping.}}, author = {{Tong, Jun and Ping, Li and Ma, Xiao}}, booktitle = {{Proc.\ IEEE Int.\ Conf.\ Comm.}}, pages = {{1718–1723}}, title = {{{Superposition coding with peak-power limitation}}}, doi = {{10.1109/ICC.2006.254967}}, volume = {{4}}, year = {{2006}}, } @article{40378, author = {{Haller, Melanie and Bischoff, Margrit and Feest, Claudia and Rosiny (Hg.), Claudia}}, journal = {{e_motion in motion. Jahrbuch Tanzforschung, Bd. 16), Münster 2006, S. 157-173 (zusammen mit Gabriele Klein)}}, title = {{{Bewegung, Bewegtheit und Beweglichkeit. Subjektivität im Tango Argentino}}}, year = {{2006}}, } @article{41285, author = {{Supplit, R. and Hüsing, N. and Bertagnolli, H. and Bauer, Matthias and Kessler, V. and Seisenbaeva, G. A. and Bernstorff, S. and Gross, S.}}, issn = {{0959-9428}}, journal = {{J. Mater. Chem.}}, keywords = {{Materials Chemistry, General Chemistry}}, number = {{45}}, pages = {{4443--4453}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{Synthesis and characterization of orthorhombic, 2d-centered rectangular and lamellar iron oxide doped silica films}}}, doi = {{10.1039/b606386a}}, volume = {{16}}, year = {{2006}}, } @article{41284, author = {{Liu, Xiong and Bauer, Matthias and Bertagnolli, Helmut and Roduner, Emil and van Slageren, Joris and Phillipp, Fritz}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{General Physics and Astronomy}}, number = {{25}}, publisher = {{American Physical Society (APS)}}, title = {{{Structure and Magnetization of Small Monodisperse Platinum Clusters}}}, doi = {{10.1103/physrevlett.97.253401}}, volume = {{97}}, year = {{2006}}, } @article{17289, abstract = {{Robots have to deal with an enormous amount of sensory stimuli. One solution in making sense of them is to enable a robot system to actively search for cues that help structuring the information. Studies with infants reveal that parents support the learning-process by modifying their interaction style, dependent on their child's developmental age. In our study, in which parents demonstrated everyday actions to their preverbal children (8-11 months old), our aim was to identify objective parameters for multimodal action modification. Our results reveal two action parameters being modified in adult-child interaction: roundness and pace. Furthermore, we found that language has the power to help children structuring actions sequences by synchrony and emphasis. These insights are discussed with respect to the built-in attention architecture of a socially interactive robot, which enables it to understand demonstrated actions. Our algorithmic approach towards automatically detecting the task structure in child-designed input demonstrates the potential impact of insights from developmental learning on robotics. The presented findings pave the way to automatically detect when to imitate in a demonstration}}, author = {{Rohlfing, Katharina and Fritsch, Jannik and Wrede, Britta and Jungmann, Tanja}}, issn = {{1568-5535}}, journal = {{Advanced Robotics}}, keywords = {{multi-modal motherese, child-directed input, motionese, learning mechanisms}}, number = {{10}}, pages = {{1183--1199}}, publisher = {{VSP BV}}, title = {{{How can multimodal cues from child-directed interaction reduce learning complexity in robots?}}}, doi = {{10.1163/156855306778522532}}, volume = {{20}}, year = {{2006}}, } @inproceedings{17286, author = {{Wrede, Britta and Rohlfing, Katharina and Nagai, Yukie}}, booktitle = {{5th Biennial International Conference on Infant Studies (ICIS 2006)}}, title = {{{How to make sense of environmental interaction and dynamics. Symposium: Models of infant development: Are we really serious about environmental interaction and dynamics?}}}, year = {{2006}}, }