[{"type":"conference","publication":"Proc.\\ Asilomar Conf.\\ Signals Syst.\\ Computers","abstract":[{"text":"We derive an estimator of the cycle period of a univariate cyclostationary process based on an information- theoretic criterion. Transforming the univariate cyclostationary process into a vector-valued wide-sense stationary process allows us to obtain the structure of the covariance matrix, which is block-Toeplitz, and its block size depends on the unknown cycle period. Therefore, we sweep the block size and obtain the ML estimate of the covariance matrix, required for the information- theoretic criterion. Since there are no closed-form ML estimates of block-Toeplitz matrices, we asymptotically approximate them as block-circulant. Finally, some numerical examples show the good performance of the proposed estimator.","lang":"eng"}],"status":"public","_id":"40759","user_id":"43497","department":[{"_id":"263"}],"year":"2014","place":"Pacific Grove, USA","citation":{"apa":"Ramírez, D., Schreier, P. J., Vía, J., Santamaría, I., &#38; Scharf, L. L. (2014). A Regularized Maximum Likelihood Estimator for the Period of a Cyclostationary Process. <i>Proc.\\ Asilomar Conf.\\ Signals Syst.\\ Computers</i>.","mla":"Ramírez, D., et al. “A Regularized Maximum Likelihood Estimator for the Period of a Cyclostationary Process.” <i>Proc.\\ Asilomar Conf.\\ Signals Syst.\\ Computers</i>, 2014.","short":"D. Ramírez, P.J. Schreier, J. Vía, I. Santamaría, L.L. Scharf, in: Proc.\\ Asilomar Conf.\\ Signals Syst.\\ Computers, Pacific Grove, USA, 2014.","bibtex":"@inproceedings{Ramírez_Schreier_Vía_Santamaría_Scharf_2014, place={Pacific Grove, USA}, title={A Regularized Maximum Likelihood Estimator for the Period of a Cyclostationary Process}, booktitle={Proc.\\ Asilomar Conf.\\ Signals Syst.\\ Computers}, author={Ramírez, D. and Schreier, P. J. and Vía, J. and Santamaría, I. and Scharf, L. L.}, year={2014} }","chicago":"Ramírez, D., P. J. Schreier, J. Vía, I. Santamaría, and L. L. Scharf. “A Regularized Maximum Likelihood Estimator for the Period of a Cyclostationary Process.” In <i>Proc.\\ Asilomar Conf.\\ Signals Syst.\\ Computers</i>. Pacific Grove, USA, 2014.","ieee":"D. Ramírez, P. J. Schreier, J. Vía, I. Santamaría, and L. L. Scharf, “A Regularized Maximum Likelihood Estimator for the Period of a Cyclostationary Process,” 2014.","ama":"Ramírez D, Schreier PJ, Vía J, Santamaría I, Scharf LL. A Regularized Maximum Likelihood Estimator for the Period of a Cyclostationary Process. In: <i>Proc.\\ Asilomar Conf.\\ Signals Syst.\\ Computers</i>. ; 2014."},"date_updated":"2023-01-30T12:00:37Z","date_created":"2023-01-30T11:51:48Z","author":[{"last_name":"Ramírez","full_name":"Ramírez, D.","first_name":"D."},{"last_name":"Schreier","full_name":"Schreier, P. J.","first_name":"P. J."},{"first_name":"J.","full_name":"Vía, J.","last_name":"Vía"},{"first_name":"I.","full_name":"Santamaría, I.","last_name":"Santamaría"},{"first_name":"L. L.","full_name":"Scharf, L. L.","last_name":"Scharf"}],"title":"A Regularized Maximum Likelihood Estimator for the Period of a Cyclostationary Process"},{"type":"journal_article","publication":"IEEE Signal Processing Magazine","status":"public","abstract":[{"text":"Complex-valued signals occur in many areas of science and engineering and are thus of fundamental interest. When developing signal processing methods in the complex domain, there are two key issues: making use of the full statistical information and optimization. In this article, we review the necessary tools to address these two key issues and provide examples in filtering and blind source separation (BSS) that utilize these tools.","lang":"eng"}],"user_id":"43497","department":[{"_id":"263"}],"_id":"40763","issue":"5","citation":{"bibtex":"@article{Adali_Schreier_2014, title={Optimization and estimation of complex-valued signals}, volume={31}, DOI={<a href=\"https://doi.org/10.1109/MSP.2013.2287951\">10.1109/MSP.2013.2287951</a>}, number={5}, journal={IEEE Signal Processing Magazine}, author={Adali, Tulay and Schreier, Peter J.}, year={2014}, pages={112–128} }","short":"T. Adali, P.J. Schreier, IEEE Signal Processing Magazine 31 (2014) 112–128.","mla":"Adali, Tulay, and Peter J. Schreier. “Optimization and Estimation of Complex-Valued Signals.” <i>IEEE Signal Processing Magazine</i>, vol. 31, no. 5, 2014, pp. 112–128, doi:<a href=\"https://doi.org/10.1109/MSP.2013.2287951\">10.1109/MSP.2013.2287951</a>.","apa":"Adali, T., &#38; Schreier, P. J. (2014). Optimization and estimation of complex-valued signals. <i>IEEE Signal Processing Magazine</i>, <i>31</i>(5), 112–128. <a href=\"https://doi.org/10.1109/MSP.2013.2287951\">https://doi.org/10.1109/MSP.2013.2287951</a>","ama":"Adali T, Schreier PJ. Optimization and estimation of complex-valued signals. <i>IEEE Signal Processing Magazine</i>. 2014;31(5):112–128. doi:<a href=\"https://doi.org/10.1109/MSP.2013.2287951\">10.1109/MSP.2013.2287951</a>","ieee":"T. Adali and P. J. Schreier, “Optimization and estimation of complex-valued signals,” <i>IEEE Signal Processing Magazine</i>, vol. 31, no. 5, pp. 112–128, 2014, doi: <a href=\"https://doi.org/10.1109/MSP.2013.2287951\">10.1109/MSP.2013.2287951</a>.","chicago":"Adali, Tulay, and Peter J. Schreier. “Optimization and Estimation of Complex-Valued Signals.” <i>IEEE Signal Processing Magazine</i> 31, no. 5 (2014): 112–128. <a href=\"https://doi.org/10.1109/MSP.2013.2287951\">https://doi.org/10.1109/MSP.2013.2287951</a>."},"intvolume":"        31","page":"112–128","year":"2014","date_created":"2023-01-30T11:51:48Z","author":[{"first_name":"Tulay","last_name":"Adali","full_name":"Adali, Tulay"},{"first_name":"Peter J.","full_name":"Schreier, Peter J.","last_name":"Schreier"}],"volume":31,"date_updated":"2023-01-30T12:00:30Z","doi":"10.1109/MSP.2013.2287951","title":"Optimization and estimation of complex-valued signals"},{"department":[{"_id":"263"}],"user_id":"43497","_id":"40769","status":"public","publication":"Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.","type":"conference","doi":"10.1109/ICASSP.2014.6855020","title":"Interference Shaping Constraints for Underlay MIMO Interference Channels","author":[{"first_name":"Christian","full_name":"Lameiro, Christian","last_name":"Lameiro"},{"first_name":"Ignacio","last_name":"Santamaría","full_name":"Santamaría, Ignacio"},{"last_name":"Utschick","full_name":"Utschick, Wolfgang","first_name":"Wolfgang"}],"date_created":"2023-01-30T11:51:49Z","date_updated":"2023-01-30T12:00:46Z","citation":{"ieee":"C. Lameiro, I. Santamaría, and W. Utschick, “Interference Shaping Constraints for Underlay MIMO Interference Channels,” 2014, doi: <a href=\"https://doi.org/10.1109/ICASSP.2014.6855020\">10.1109/ICASSP.2014.6855020</a>.","chicago":"Lameiro, Christian, Ignacio Santamaría, and Wolfgang Utschick. “Interference Shaping Constraints for Underlay MIMO Interference Channels.” In <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> Florence, Italy, 2014. <a href=\"https://doi.org/10.1109/ICASSP.2014.6855020\">https://doi.org/10.1109/ICASSP.2014.6855020</a>.","ama":"Lameiro C, Santamaría I, Utschick W. Interference Shaping Constraints for Underlay MIMO Interference Channels. In: <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> ; 2014. doi:<a href=\"https://doi.org/10.1109/ICASSP.2014.6855020\">10.1109/ICASSP.2014.6855020</a>","bibtex":"@inproceedings{Lameiro_Santamaría_Utschick_2014, place={Florence, Italy}, title={Interference Shaping Constraints for Underlay MIMO Interference Channels}, DOI={<a href=\"https://doi.org/10.1109/ICASSP.2014.6855020\">10.1109/ICASSP.2014.6855020</a>}, booktitle={Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.}, author={Lameiro, Christian and Santamaría, Ignacio and Utschick, Wolfgang}, year={2014} }","short":"C. Lameiro, I. Santamaría, W. Utschick, in: Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process., Florence, Italy, 2014.","mla":"Lameiro, Christian, et al. “Interference Shaping Constraints for Underlay MIMO Interference Channels.” <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i>, 2014, doi:<a href=\"https://doi.org/10.1109/ICASSP.2014.6855020\">10.1109/ICASSP.2014.6855020</a>.","apa":"Lameiro, C., Santamaría, I., &#38; Utschick, W. (2014). Interference Shaping Constraints for Underlay MIMO Interference Channels. <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> <a href=\"https://doi.org/10.1109/ICASSP.2014.6855020\">https://doi.org/10.1109/ICASSP.2014.6855020</a>"},"year":"2014","place":"Florence, Italy"},{"type":"journal_article","publication":"IEEE Signal Process.\\ Lett.","status":"public","_id":"40765","user_id":"43497","department":[{"_id":"263"}],"issue":"7","year":"2014","citation":{"apa":"Stein, M., Mezghani, A., &#38; Nossek, J. A. (2014). A lower bound for the Fisher information measure. <i>IEEE Signal Process.\\ Lett.</i>, <i>21</i>(7), 796–799. <a href=\"https://doi.org/10.1109/LSP.2014.2316008\">https://doi.org/10.1109/LSP.2014.2316008</a>","mla":"Stein, Manuel, et al. “A Lower Bound for the Fisher Information Measure.” <i>IEEE Signal Process.\\ Lett.</i>, vol. 21, no. 7, 2014, pp. 796–799, doi:<a href=\"https://doi.org/10.1109/LSP.2014.2316008\">10.1109/LSP.2014.2316008</a>.","bibtex":"@article{Stein_Mezghani_Nossek_2014, title={A lower bound for the Fisher information measure}, volume={21}, DOI={<a href=\"https://doi.org/10.1109/LSP.2014.2316008\">10.1109/LSP.2014.2316008</a>}, number={7}, journal={IEEE Signal Process.\\ Lett.}, author={Stein, Manuel and Mezghani, Amine and Nossek, Josef A.}, year={2014}, pages={796–799} }","short":"M. Stein, A. Mezghani, J.A. Nossek, IEEE Signal Process.\\ Lett. 21 (2014) 796–799.","ama":"Stein M, Mezghani A, Nossek JA. A lower bound for the Fisher information measure. <i>IEEE Signal Process\\ Lett</i>. 2014;21(7):796–799. doi:<a href=\"https://doi.org/10.1109/LSP.2014.2316008\">10.1109/LSP.2014.2316008</a>","chicago":"Stein, Manuel, Amine Mezghani, and Josef A. Nossek. “A Lower Bound for the Fisher Information Measure.” <i>IEEE Signal Process.\\ Lett.</i> 21, no. 7 (2014): 796–799. <a href=\"https://doi.org/10.1109/LSP.2014.2316008\">https://doi.org/10.1109/LSP.2014.2316008</a>.","ieee":"M. Stein, A. Mezghani, and J. A. Nossek, “A lower bound for the Fisher information measure,” <i>IEEE Signal Process.\\ Lett.</i>, vol. 21, no. 7, pp. 796–799, 2014, doi: <a href=\"https://doi.org/10.1109/LSP.2014.2316008\">10.1109/LSP.2014.2316008</a>."},"intvolume":"        21","page":"796–799","date_updated":"2023-01-30T12:00:44Z","date_created":"2023-01-30T11:51:49Z","author":[{"first_name":"Manuel","last_name":"Stein","full_name":"Stein, Manuel"},{"first_name":"Amine","last_name":"Mezghani","full_name":"Mezghani, Amine"},{"first_name":"Josef A.","full_name":"Nossek, Josef A.","last_name":"Nossek"}],"volume":21,"title":"A lower bound for the Fisher information measure","doi":"10.1109/LSP.2014.2316008"},{"place":"Darmstadt, Germany","year":"2013","citation":{"ama":"Lameiro C, Santamaría I. An Interference Alignment Algorithm for Structured Channels. In: <i>Proc. IEEE Work. Signal Process. Advances in Wireless Comm.</i> ; 2013. doi:<a href=\"https://doi.org/10.1109/SPAWC.2013.6612059\">10.1109/SPAWC.2013.6612059</a>","chicago":"Lameiro, Christian, and Ignacio Santamaría. “An Interference Alignment Algorithm for Structured Channels.” In <i>Proc. IEEE Work. Signal Process. Advances in Wireless Comm.</i> Darmstadt, Germany, 2013. <a href=\"https://doi.org/10.1109/SPAWC.2013.6612059\">https://doi.org/10.1109/SPAWC.2013.6612059</a>.","ieee":"C. Lameiro and I. Santamaría, “An Interference Alignment Algorithm for Structured Channels,” 2013, doi: <a href=\"https://doi.org/10.1109/SPAWC.2013.6612059\">10.1109/SPAWC.2013.6612059</a>.","apa":"Lameiro, C., &#38; Santamaría, I. (2013). An Interference Alignment Algorithm for Structured Channels. <i>Proc. IEEE Work. Signal Process. Advances in Wireless Comm.</i> <a href=\"https://doi.org/10.1109/SPAWC.2013.6612059\">https://doi.org/10.1109/SPAWC.2013.6612059</a>","short":"C. Lameiro, I. Santamaría, in: Proc. IEEE Work. Signal Process. Advances in Wireless Comm., Darmstadt, Germany, 2013.","bibtex":"@inproceedings{Lameiro_Santamaría_2013, place={Darmstadt, Germany}, title={An Interference Alignment Algorithm for Structured Channels}, DOI={<a href=\"https://doi.org/10.1109/SPAWC.2013.6612059\">10.1109/SPAWC.2013.6612059</a>}, booktitle={Proc. IEEE Work. Signal Process. Advances in Wireless Comm.}, author={Lameiro, Christian and Santamaría, Ignacio}, year={2013} }","mla":"Lameiro, Christian, and Ignacio Santamaría. “An Interference Alignment Algorithm for Structured Channels.” <i>Proc. IEEE Work. Signal Process. Advances in Wireless Comm.</i>, 2013, doi:<a href=\"https://doi.org/10.1109/SPAWC.2013.6612059\">10.1109/SPAWC.2013.6612059</a>."},"title":"An Interference Alignment Algorithm for Structured Channels","doi":"10.1109/SPAWC.2013.6612059","date_updated":"2023-01-30T11:57:58Z","author":[{"first_name":"Christian","full_name":"Lameiro, Christian","last_name":"Lameiro"},{"last_name":"Santamaría","full_name":"Santamaría, Ignacio","first_name":"Ignacio"}],"date_created":"2023-01-30T11:51:52Z","abstract":[{"lang":"eng","text":"In this paper we propose a new interference alignment (IA) algorithm specifically designed to work with structured channels (e.g., diagonal or block-diagonal). Multiple-input multiple-output (MIMO) structured channels arise when symbol extensions -either in time or frequency- are employed jointly with the spatial dimension in the design of the precoders. In this case, the rank constraint in the direct channels must explicitly be taken into account into the optimization problem to ensure that there is no degrees-of-freedom (DoF) loss. To this end, we propose an algorithm that minimizes the interference leakage while ensuring that the direct links are full rank and the transmitters satisfy a power constraint. The algorithm is based upon an alternating optimization procedure, which solves a generalized eigenvalue problem at each step. We show through simulations the advantages of the proposed algorithm in several scenarios that use symbols extensions or improper (a.k.a. asymmetric) signalling."}],"status":"public","publication":"Proc. IEEE Work. Signal Process. Advances in Wireless Comm.","type":"conference","_id":"40788","department":[{"_id":"263"}],"user_id":"43497"},{"publication":"Proc.\\ IEEE Int.\\ Conf.\\ Comm.","type":"conference","status":"public","abstract":[{"text":"It has been recently shown that for the 3-user single-input single-output (SISO) interference channel with constant channel coefficients, a maximum of 1.2 degrees-of-freedom (DoF) are achievable using linear interference alignment schemes when improper (a.k.a. asymmetric) Gaussian signaling is applied. In this paper, we study the 4-user SISO interference channel and provide inner and outer bounds for the total number of DoF achievable for this channel. We prove that at least 4/3 DoF are achievable for the 4-user channel using also linear interference alignment techniques and improper signaling. A simple converse proof shows that no more than 8/5 DoF are achievable for this scheme. Simulation results seem to indicate that the inner bound is in fact tight for this channel, and serve to illustrate the sum-rate improvement with respect to time division multiple access (TDMA) techniques.","lang":"eng"}],"department":[{"_id":"263"}],"user_id":"43497","_id":"40789","citation":{"apa":"Lameiro, C., &#38; Santamaría, I. (2013). Degrees-of-Freedom for the 4-User SISO Interference Channel with Improper Signaling. <i>Proc.\\ IEEE Int.\\ Conf.\\ Comm.</i> <a href=\"https://doi.org/10.1109/ICC.2013.6655009\">https://doi.org/10.1109/ICC.2013.6655009</a>","bibtex":"@inproceedings{Lameiro_Santamaría_2013, place={Budapest, Hungary}, title={Degrees-of-Freedom for the 4-User SISO Interference Channel with Improper Signaling}, DOI={<a href=\"https://doi.org/10.1109/ICC.2013.6655009\">10.1109/ICC.2013.6655009</a>}, booktitle={Proc.\\ IEEE Int.\\ Conf.\\ Comm.}, author={Lameiro, Christian and Santamaría, Ignacio}, year={2013} }","short":"C. Lameiro, I. Santamaría, in: Proc.\\ IEEE Int.\\ Conf.\\ Comm., Budapest, Hungary, 2013.","mla":"Lameiro, Christian, and Ignacio Santamaría. “Degrees-of-Freedom for the 4-User SISO Interference Channel with Improper Signaling.” <i>Proc.\\ IEEE Int.\\ Conf.\\ Comm.</i>, 2013, doi:<a href=\"https://doi.org/10.1109/ICC.2013.6655009\">10.1109/ICC.2013.6655009</a>.","ama":"Lameiro C, Santamaría I. Degrees-of-Freedom for the 4-User SISO Interference Channel with Improper Signaling. In: <i>Proc.\\ IEEE Int.\\ Conf.\\ Comm.</i> ; 2013. doi:<a href=\"https://doi.org/10.1109/ICC.2013.6655009\">10.1109/ICC.2013.6655009</a>","chicago":"Lameiro, Christian, and Ignacio Santamaría. “Degrees-of-Freedom for the 4-User SISO Interference Channel with Improper Signaling.” In <i>Proc.\\ IEEE Int.\\ Conf.\\ Comm.</i> Budapest, Hungary, 2013. <a href=\"https://doi.org/10.1109/ICC.2013.6655009\">https://doi.org/10.1109/ICC.2013.6655009</a>.","ieee":"C. Lameiro and I. Santamaría, “Degrees-of-Freedom for the 4-User SISO Interference Channel with Improper Signaling,” 2013, doi: <a href=\"https://doi.org/10.1109/ICC.2013.6655009\">10.1109/ICC.2013.6655009</a>."},"place":"Budapest, Hungary","year":"2013","date_created":"2023-01-30T11:51:52Z","author":[{"first_name":"Christian","last_name":"Lameiro","full_name":"Lameiro, Christian"},{"full_name":"Santamaría, Ignacio","last_name":"Santamaría","first_name":"Ignacio"}],"date_updated":"2023-01-30T11:57:55Z","doi":"10.1109/ICC.2013.6655009","title":"Degrees-of-Freedom for the 4-User SISO Interference Channel with Improper Signaling"},{"citation":{"chicago":"Real, Eusebio, Alma Eguizabal, Alejandro Ponton, J. Fernando Val-Bernal, Marta Mayorga, Jose Revuelta, Jose Lopez-Higuera, and Olga Conde. “Optical Coherence Tomography Assessment of Vessel Wall Degradation in Aneurysmatic Thoracic Aortas.” In <i>European Conferences on Biomedical Optics</i>. Munich, Germany, 2013.","ieee":"E. Real <i>et al.</i>, “Optical Coherence Tomography Assessment of Vessel Wall Degradation in Aneurysmatic Thoracic Aortas,” 2013.","ama":"Real E, Eguizabal A, Ponton A, et al. Optical Coherence Tomography Assessment of Vessel Wall Degradation in Aneurysmatic Thoracic Aortas. In: <i>European Conferences on Biomedical Optics</i>. ; 2013.","mla":"Real, Eusebio, et al. “Optical Coherence Tomography Assessment of Vessel Wall Degradation in Aneurysmatic Thoracic Aortas.” <i>European Conferences on Biomedical Optics</i>, 2013.","short":"E. Real, A. Eguizabal, A. Ponton, J.F. Val-Bernal, M. Mayorga, J. Revuelta, J. Lopez-Higuera, O. Conde, in: European Conferences on Biomedical Optics, Munich, Germany, 2013.","bibtex":"@inproceedings{Real_Eguizabal_Ponton_Val-Bernal_Mayorga_Revuelta_Lopez-Higuera_Conde_2013, place={Munich, Germany}, title={Optical Coherence Tomography Assessment of Vessel Wall Degradation in Aneurysmatic Thoracic Aortas}, booktitle={European Conferences on Biomedical Optics}, author={Real, Eusebio and Eguizabal, Alma and Ponton, Alejandro and Val-Bernal, J. Fernando and Mayorga, Marta and Revuelta, Jose and Lopez-Higuera, Jose and Conde, Olga}, year={2013} }","apa":"Real, E., Eguizabal, A., Ponton, A., Val-Bernal, J. F., Mayorga, M., Revuelta, J., Lopez-Higuera, J., &#38; Conde, O. (2013). Optical Coherence Tomography Assessment of Vessel Wall Degradation in Aneurysmatic Thoracic Aortas. <i>European Conferences on Biomedical Optics</i>."},"place":"Munich, Germany","year":"2013","date_created":"2023-01-30T11:51:53Z","author":[{"last_name":"Real","full_name":"Real, Eusebio","first_name":"Eusebio"},{"full_name":"Eguizabal, Alma","last_name":"Eguizabal","first_name":"Alma"},{"last_name":"Ponton","full_name":"Ponton, Alejandro","first_name":"Alejandro"},{"first_name":"J. Fernando","last_name":"Val-Bernal","full_name":"Val-Bernal, J. Fernando"},{"first_name":"Marta","last_name":"Mayorga","full_name":"Mayorga, Marta"},{"last_name":"Revuelta","full_name":"Revuelta, Jose","first_name":"Jose"},{"first_name":"Jose","full_name":"Lopez-Higuera, Jose","last_name":"Lopez-Higuera"},{"first_name":"Olga","last_name":"Conde","full_name":"Conde, Olga"}],"date_updated":"2023-01-30T11:58:02Z","title":"Optical Coherence Tomography Assessment of Vessel Wall Degradation in Aneurysmatic Thoracic Aortas","type":"conference","publication":"European Conferences on Biomedical Optics","status":"public","abstract":[{"text":"OCT images of human aorta from aneurysms reveals elastin disorder and smooth muscle cell alteration when visualizing the intima and media layers of the aortic wall. Results correlate with pathologist diagnosis in aneurysmatic and control aortas.","lang":"eng"}],"user_id":"43497","department":[{"_id":"263"}],"_id":"40792"},{"_id":"40795","user_id":"43497","department":[{"_id":"263"}],"type":"conference","publication":"Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.","status":"public","date_updated":"2023-01-30T11:58:00Z","author":[{"full_name":"Stein, Manuel","last_name":"Stein","first_name":"Manuel"},{"first_name":"Friederike","last_name":"Wendler","full_name":"Wendler, Friederike"},{"last_name":"Mezghani","full_name":"Mezghani, Amine","first_name":"Amine"},{"first_name":"Josef A.","full_name":"Nossek, Josef A.","last_name":"Nossek"}],"date_created":"2023-01-30T11:51:53Z","title":"Quantization-loss reduction for signal parameter estimation","year":"2013","place":"Vancouver, Canada","citation":{"ieee":"M. Stein, F. Wendler, A. Mezghani, and J. A. Nossek, “Quantization-loss reduction for signal parameter estimation,” 2013.","chicago":"Stein, Manuel, Friederike Wendler, Amine Mezghani, and Josef A. Nossek. “Quantization-Loss Reduction for Signal Parameter Estimation.” In <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> Vancouver, Canada, 2013.","ama":"Stein M, Wendler F, Mezghani A, Nossek JA. Quantization-loss reduction for signal parameter estimation. In: <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> ; 2013.","apa":"Stein, M., Wendler, F., Mezghani, A., &#38; Nossek, J. A. (2013). Quantization-loss reduction for signal parameter estimation. <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i>","bibtex":"@inproceedings{Stein_Wendler_Mezghani_Nossek_2013, place={Vancouver, Canada}, title={Quantization-loss reduction for signal parameter estimation}, booktitle={Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.}, author={Stein, Manuel and Wendler, Friederike and Mezghani, Amine and Nossek, Josef A.}, year={2013} }","short":"M. Stein, F. Wendler, A. Mezghani, J.A. Nossek, in: Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process., Vancouver, Canada, 2013.","mla":"Stein, Manuel, et al. “Quantization-Loss Reduction for Signal Parameter Estimation.” <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i>, 2013."}},{"status":"public","abstract":[{"text":"Texture analysis of light scattering in tissue is proposed to obtain diagnostic information from breast cancer specimens. Light scattering measurements are minimally invasive, and allow the estimation of tissue morphology to guide the surgeon in resection surgeries. The usability of scatter signatures acquired with a micro-sampling reflectance spectral imaging system was improved utilizing an empirical approximation to the Mie theory to estimate the scattering power on a per-pixel basis. Co-occurrence analysis is then applied to the scattering power images to extract the textural features. A statistical analysis of the features demonstrated the suitability of the autocorrelation for the classification of notmalignant (normal epithelia and stroma, benign epithelia and stroma, inflammation), malignant (DCIS, IDC, ILC) and adipose tissue, since it reveals morphological information of tissue. Non-malignant tissue shows higher autocorrelation values while adipose tissue presents a very low autocorrelation on its scatter texture, being malignant the middle ground. Consequently, a fast linear classifier based on the consideration of just one straightforward feature is enough for providing relevant diagnostic information. A leave-one-out validation of the linear classifier on 29 samples with 48 regions of interest showed classification accuracies of 98.74% on adipose tissue, 82.67% on non-malignant tissue and 72.37% on malignant tissue, in comparison with the biopsy H and E gold standard. This demonstrates that autocorrelation analysis of scatter signatures is a very computationally efficient and automated approach to provide pathological information in real-time to guide surgeon during tissue resection.","lang":"eng"}],"publication":"SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering","type":"conference","department":[{"_id":"263"}],"user_id":"43497","_id":"40798","citation":{"chicago":"Eguizabal, Alma, Ashley M. Laughney, P. Beatriz Garcia-Allende, Venkataramanan Krishnaswamy, Wendy A. Wells, Keith D. Paulsen, Brian W. Pogue, Jose Lopez-Higuera, and Olga M. Conde. “Linear Classifier and Textural Analysis of Optical Scattering Images for Tumor Classification during Breast Cancer Extraction.” In <i>SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering</i>. San Francisco, USA, 2013.","ieee":"A. Eguizabal <i>et al.</i>, “Linear classifier and textural analysis of optical scattering images for tumor classification during breast cancer extraction,” 2013.","ama":"Eguizabal A, Laughney AM, Garcia-Allende PB, et al. Linear classifier and textural analysis of optical scattering images for tumor classification during breast cancer extraction. In: <i>SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering</i>. ; 2013.","mla":"Eguizabal, Alma, et al. “Linear Classifier and Textural Analysis of Optical Scattering Images for Tumor Classification during Breast Cancer Extraction.” <i>SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering</i>, 2013.","bibtex":"@inproceedings{Eguizabal_Laughney_Garcia-Allende_Krishnaswamy_Wells_Paulsen_Pogue_Lopez-Higuera_Conde_2013, place={San Francisco, USA}, title={Linear classifier and textural analysis of optical scattering images for tumor classification during breast cancer extraction}, booktitle={SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering}, author={Eguizabal, Alma and Laughney, Ashley M. and Garcia-Allende, P. Beatriz and Krishnaswamy, Venkataramanan and Wells, Wendy A. and Paulsen, Keith D. and Pogue, Brian W. and Lopez-Higuera, Jose and Conde, Olga M.}, year={2013} }","short":"A. Eguizabal, A.M. Laughney, P.B. Garcia-Allende, V. Krishnaswamy, W.A. Wells, K.D. Paulsen, B.W. Pogue, J. Lopez-Higuera, O.M. Conde, in: SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering, San Francisco, USA, 2013.","apa":"Eguizabal, A., Laughney, A. M., Garcia-Allende, P. B., Krishnaswamy, V., Wells, W. A., Paulsen, K. D., Pogue, B. W., Lopez-Higuera, J., &#38; Conde, O. M. (2013). Linear classifier and textural analysis of optical scattering images for tumor classification during breast cancer extraction. <i>SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering</i>."},"year":"2013","place":"San Francisco, USA","title":"Linear classifier and textural analysis of optical scattering images for tumor classification during breast cancer extraction","date_created":"2023-01-30T11:51:54Z","author":[{"first_name":"Alma","last_name":"Eguizabal","full_name":"Eguizabal, Alma"},{"full_name":"Laughney, Ashley M.","last_name":"Laughney","first_name":"Ashley M."},{"last_name":"Garcia-Allende","full_name":"Garcia-Allende, P. Beatriz","first_name":"P. Beatriz"},{"first_name":"Venkataramanan","last_name":"Krishnaswamy","full_name":"Krishnaswamy, Venkataramanan"},{"last_name":"Wells","full_name":"Wells, Wendy A.","first_name":"Wendy A."},{"full_name":"Paulsen, Keith D.","last_name":"Paulsen","first_name":"Keith D."},{"first_name":"Brian W.","full_name":"Pogue, Brian W.","last_name":"Pogue"},{"last_name":"Lopez-Higuera","full_name":"Lopez-Higuera, Jose","first_name":"Jose"},{"first_name":"Olga M.","full_name":"Conde, Olga M.","last_name":"Conde"}],"date_updated":"2023-01-30T11:58:27Z"},{"title":"Fractal analysis of scatter imaging signatures to distinguish breast pathologies","date_created":"2023-01-30T11:51:54Z","author":[{"first_name":"Alma","last_name":"Eguizabal","full_name":"Eguizabal, Alma"},{"first_name":"Ashley M.","last_name":"Laughney","full_name":"Laughney, Ashley M."},{"last_name":"Krishnaswamy","full_name":"Krishnaswamy, Venkataramanan","first_name":"Venkataramanan"},{"full_name":"Wells, Wendy A.","last_name":"Wells","first_name":"Wendy A."},{"last_name":"Paulsen","full_name":"Paulsen, Keith D.","first_name":"Keith D."},{"first_name":"Brian W.","full_name":"Pogue, Brian W.","last_name":"Pogue"},{"first_name":"Jose","full_name":"Lopez-Higuera, Jose","last_name":"Lopez-Higuera"},{"full_name":"Conde, Olga M.","last_name":"Conde","first_name":"Olga M."}],"date_updated":"2023-01-30T11:58:25Z","citation":{"mla":"Eguizabal, Alma, et al. “Fractal Analysis of Scatter Imaging Signatures to Distinguish Breast Pathologies.” <i>SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering</i>, 2013.","bibtex":"@inproceedings{Eguizabal_Laughney_Krishnaswamy_Wells_Paulsen_Pogue_Lopez-Higuera_Conde_2013, place={San Francisco, USA}, title={Fractal analysis of scatter imaging signatures to distinguish breast pathologies}, booktitle={SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering}, author={Eguizabal, Alma and Laughney, Ashley M. and Krishnaswamy, Venkataramanan and Wells, Wendy A. and Paulsen, Keith D. and Pogue, Brian W. and Lopez-Higuera, Jose and Conde, Olga M.}, year={2013} }","short":"A. Eguizabal, A.M. Laughney, V. Krishnaswamy, W.A. Wells, K.D. Paulsen, B.W. Pogue, J. Lopez-Higuera, O.M. Conde, in: SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering, San Francisco, USA, 2013.","apa":"Eguizabal, A., Laughney, A. M., Krishnaswamy, V., Wells, W. A., Paulsen, K. D., Pogue, B. W., Lopez-Higuera, J., &#38; Conde, O. M. (2013). Fractal analysis of scatter imaging signatures to distinguish breast pathologies. <i>SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering</i>.","ieee":"A. Eguizabal <i>et al.</i>, “Fractal analysis of scatter imaging signatures to distinguish breast pathologies,” 2013.","chicago":"Eguizabal, Alma, Ashley M. Laughney, Venkataramanan Krishnaswamy, Wendy A. Wells, Keith D. Paulsen, Brian W. Pogue, Jose Lopez-Higuera, and Olga M. Conde. “Fractal Analysis of Scatter Imaging Signatures to Distinguish Breast Pathologies.” In <i>SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering</i>. San Francisco, USA, 2013.","ama":"Eguizabal A, Laughney AM, Krishnaswamy V, et al. Fractal analysis of scatter imaging signatures to distinguish breast pathologies. In: <i>SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering</i>. ; 2013."},"place":"San Francisco, USA","year":"2013","user_id":"43497","department":[{"_id":"263"}],"_id":"40799","status":"public","abstract":[{"lang":"eng","text":"Fractal analysis combined with a label-free scattering technique is proposed for describing the pathological architecture of tumors. Clinicians and pathologists are conventionally trained to classify abnormal features such as structural irregularities or high indices of mitosis. The potential of fractal analysis lies in the fact of being a morphometric measure of the irregular structures providing a measure of the object’s complexity and self-similarity. As cancer is characterized by disorder and irregularity in tissues, this measure could be related to tumor growth. Fractal analysis has been probed in the understanding of the tumor vasculature network. This work addresses the feasibility of applying fractal analysis to the scattering power map (as a physical modeling) and principal components (as a statistical modeling) provided by a localized reflectance spectroscopic system. Disorder, irregularity and cell size variation in tissue samples is translated into the scattering power and principal components magnitude and its fractal dimension is correlated with the pathologist assessment of the samples. The fractal dimension is computed applying the box-counting technique. Results show that fractal analysis of ex-vivo fresh tissue samples exhibits separated ranges of fractal dimension that could help classifier combining the fractal results with other morphological features. This contrast trend would help in the discrimination of tissues in the intraoperative context and may serve as a useful adjunct to surgeons."}],"type":"conference","publication":"SPIE Photonics West BIOS, VIII Biomedical Applications of Light Scattering"},{"publication":"European Conferences on Biomedical Optics","type":"conference","status":"public","abstract":[{"text":"Endogenous tissue contrast such as decreased hemoglobin saturation aids in cancer localization. Principal component analysis is proposed for blindly oxygenation extraction from total diffuse reflectance spectra obtained by the diffusion approximation.","lang":"eng"}],"department":[{"_id":"263"}],"user_id":"43497","_id":"40790","citation":{"ieee":"A. Eguizabal <i>et al.</i>, “Principal Component Analysis to extract blood oxygenation from theoretical modeling of total diffuse reflectance spectra,” 2013.","chicago":"Eguizabal, Alma, Pilar Garcia-Allende, Karin Jentoft, Panagiotis Symvoulidis, Jose Lopez-Higuera, Vasilis Ntziachristos, and Olga M. Conde. “Principal Component Analysis to Extract Blood Oxygenation from Theoretical Modeling of Total Diffuse Reflectance Spectra.” In <i>European Conferences on Biomedical Optics</i>. Munich, Germany, 2013.","ama":"Eguizabal A, Garcia-Allende P, Jentoft K, et al. Principal Component Analysis to extract blood oxygenation from theoretical modeling of total diffuse reflectance spectra. In: <i>European Conferences on Biomedical Optics</i>. ; 2013.","short":"A. Eguizabal, P. Garcia-Allende, K. Jentoft, P. Symvoulidis, J. Lopez-Higuera, V. Ntziachristos, O.M. Conde, in: European Conferences on Biomedical Optics, Munich, Germany, 2013.","mla":"Eguizabal, Alma, et al. “Principal Component Analysis to Extract Blood Oxygenation from Theoretical Modeling of Total Diffuse Reflectance Spectra.” <i>European Conferences on Biomedical Optics</i>, 2013.","bibtex":"@inproceedings{Eguizabal_Garcia-Allende_Jentoft_Symvoulidis_Lopez-Higuera_Ntziachristos_Conde_2013, place={Munich, Germany}, title={Principal Component Analysis to extract blood oxygenation from theoretical modeling of total diffuse reflectance spectra}, booktitle={European Conferences on Biomedical Optics}, author={Eguizabal, Alma and Garcia-Allende, Pilar and Jentoft, Karin and Symvoulidis, Panagiotis and Lopez-Higuera, Jose and Ntziachristos, Vasilis and Conde, Olga M.}, year={2013} }","apa":"Eguizabal, A., Garcia-Allende, P., Jentoft, K., Symvoulidis, P., Lopez-Higuera, J., Ntziachristos, V., &#38; Conde, O. M. (2013). Principal Component Analysis to extract blood oxygenation from theoretical modeling of total diffuse reflectance spectra. <i>European Conferences on Biomedical Optics</i>."},"place":"Munich, Germany","year":"2013","author":[{"first_name":"Alma","full_name":"Eguizabal, Alma","last_name":"Eguizabal"},{"full_name":"Garcia-Allende, Pilar","last_name":"Garcia-Allende","first_name":"Pilar"},{"full_name":"Jentoft, Karin","last_name":"Jentoft","first_name":"Karin"},{"first_name":"Panagiotis","last_name":"Symvoulidis","full_name":"Symvoulidis, Panagiotis"},{"full_name":"Lopez-Higuera, Jose","last_name":"Lopez-Higuera","first_name":"Jose"},{"first_name":"Vasilis","last_name":"Ntziachristos","full_name":"Ntziachristos, Vasilis"},{"last_name":"Conde","full_name":"Conde, Olga M.","first_name":"Olga M."}],"date_created":"2023-01-30T11:51:52Z","date_updated":"2023-01-30T11:58:56Z","title":"Principal Component Analysis to extract blood oxygenation from theoretical modeling of total diffuse reflectance spectra"},{"year":"2013","citation":{"apa":"Yu. Pogromsky, A., Matveev, A. S., Chaillet, A., &#38; Rüffer, B. S. (2013). Input-dependent stability analysis of systems with saturation in feedback. <i>Proc. 52nd IEEE Conf. Decis. Control</i>, 5903–5908.","mla":"Yu. Pogromsky, Alexander, et al. “Input-Dependent Stability Analysis of Systems with Saturation in Feedback.” <i>Proc. 52nd IEEE Conf. Decis. Control</i>, 2013, pp. 5903–5908.","short":"A. Yu. Pogromsky, A.S. Matveev, A. Chaillet, B.S. Rüffer, in: Proc. 52nd IEEE Conf. Decis. Control, 2013, pp. 5903–5908.","bibtex":"@inproceedings{Yu. Pogromsky_Matveev_Chaillet_Rüffer_2013, title={Input-dependent stability analysis of systems with saturation in feedback}, booktitle={Proc. 52nd IEEE Conf. Decis. Control}, author={Yu. Pogromsky, Alexander and Matveev, Alexey S. and Chaillet, Antoine and Rüffer, Björn S.}, year={2013}, pages={5903–5908} }","ieee":"A. Yu. Pogromsky, A. S. Matveev, A. Chaillet, and B. S. Rüffer, “Input-dependent stability analysis of systems with saturation in feedback,” in <i>Proc. 52nd IEEE Conf. Decis. Control</i>, 2013, pp. 5903–5908.","chicago":"Yu. Pogromsky, Alexander, Alexey S. Matveev, Antoine Chaillet, and Björn S. Rüffer. “Input-Dependent Stability Analysis of Systems with Saturation in Feedback.” In <i>Proc. 52nd IEEE Conf. Decis. Control</i>, 5903–5908, 2013.","ama":"Yu. Pogromsky A, Matveev AS, Chaillet A, Rüffer BS. Input-dependent stability analysis of systems with saturation in feedback. In: <i>Proc. 52nd IEEE Conf. Decis. Control</i>. ; 2013:5903–5908."},"page":"5903–5908","title":"Input-dependent stability analysis of systems with saturation in feedback","date_updated":"2023-01-30T11:59:03Z","author":[{"full_name":"Yu. Pogromsky, Alexander","last_name":"Yu. Pogromsky","first_name":"Alexander"},{"full_name":"Matveev, Alexey S.","last_name":"Matveev","first_name":"Alexey S."},{"first_name":"Antoine","full_name":"Chaillet, Antoine","last_name":"Chaillet"},{"last_name":"Rüffer","full_name":"Rüffer, Björn S.","first_name":"Björn S."}],"date_created":"2023-01-30T11:51:50Z","abstract":[{"text":"The paper deals with global stability analysis of linear control systems with saturation in feedback driven by an external input. Various new criteria based on non-quadratic Lyapunov functions are proposed, that unlike many previous results, offer better account for the role of the external excitation by providing input-dependent conditions for stability of solutions. For example, it is shown that even if the system fails to satisfy the incremental version of the circle criterion, the stability is guaranteed whenever the uniform root mean square value of the input signal is less than a computable threshold. The general theoretical results are illustrated in the case of the double integrator closed by a saturated linear feedback with an external excitation.","lang":"eng"}],"status":"public","type":"conference","publication":"Proc. 52nd IEEE Conf. Decis. Control","_id":"40777","user_id":"43497","department":[{"_id":"263"}]},{"title":"Linear equalization in communications with mismatched modeling using Krylov subspace expansion","_id":"40783","date_updated":"2023-01-30T11:59:42Z","department":[{"_id":"263"}],"date_created":"2023-01-30T11:51:51Z","user_id":"43497","author":[{"first_name":"Jun","last_name":"Tong","full_name":"Tong, Jun"},{"first_name":"Peter J.","last_name":"Schreier","full_name":"Schreier, Peter J."}],"year":"2013","status":"public","citation":{"chicago":"Tong, Jun, and Peter J. Schreier. “Linear Equalization in Communications with Mismatched Modeling Using Krylov Subspace Expansion.” In <i>Proc. IEEE Wireless Comm. Networking Conf. (WCNC)</i>, 2013.","ieee":"J. Tong and P. J. Schreier, “Linear equalization in communications with mismatched modeling using Krylov subspace expansion,” 2013.","ama":"Tong J, Schreier PJ. Linear equalization in communications with mismatched modeling using Krylov subspace expansion. In: <i>Proc. IEEE Wireless Comm. Networking Conf. (WCNC)</i>. ; 2013.","mla":"Tong, Jun, and Peter J. Schreier. “Linear Equalization in Communications with Mismatched Modeling Using Krylov Subspace Expansion.” <i>Proc. IEEE Wireless Comm. Networking Conf. (WCNC)</i>, 2013.","short":"J. Tong, P.J. Schreier, in: Proc. IEEE Wireless Comm. Networking Conf. (WCNC), 2013.","bibtex":"@inproceedings{Tong_Schreier_2013, title={Linear equalization in communications with mismatched modeling using Krylov subspace expansion}, booktitle={Proc. IEEE Wireless Comm. Networking Conf. (WCNC)}, author={Tong, Jun and Schreier, Peter J.}, year={2013} }","apa":"Tong, J., &#38; Schreier, P. J. (2013). Linear equalization in communications with mismatched modeling using Krylov subspace expansion. <i>Proc. IEEE Wireless Comm. Networking Conf. (WCNC)</i>."},"publication":"Proc. IEEE Wireless Comm. Networking Conf. (WCNC)","type":"conference"},{"_id":"40796","user_id":"43497","department":[{"_id":"263"}],"type":"journal_article","publication":"IEEE Trans.\\ Inform.\\ Theory","abstract":[{"lang":"eng","text":"In this paper we study the existence of locally most powerful invariant tests (LMPIT) for the problem of testing the covariance structure of a set of Gaussian random vectors. The LMPIT is the optimal test for the case of close hypotheses, among those satisfying the invariances of the problem, and in practical scenarios can provide better performance than the typically used generalized likelihood ratio test (GLRT). The derivation of the LMPIT usually requires one to find the maximal invariant statistic for the detection problem and then derive its distribution under both hypotheses, which in general is a rather involved procedure. As an alternative, Wijsman’s theorem provides the ratio of the maximal invariant densities without even finding an explicit expression for the maximal invariant. We first consider the problem of testing whether a set of N-dimensional Gaussian random vectors are uncorrelated or not, and show that the LMPIT is given by the Frobenius norm of the sample coherence matrix. Second, we study the case in which the vectors under the null hypothesis are uncorrelated and identically distributed, that is, the sphericity test for Gaussian vectors, for which we show that the LMPIT is given by the Frobenius norm of a normalized version of the sample covariance matrix. Finally, some numerical examples illustrate the performance of the proposed tests, which provide better results than their GLRT counterparts."}],"status":"public","date_updated":"2023-01-30T11:58:10Z","author":[{"last_name":"Ramírez","full_name":"Ramírez, D.","first_name":"D."},{"first_name":"J.","full_name":"Vía, J.","last_name":"Vía"},{"first_name":"I.","last_name":"Santamaría","full_name":"Santamaría, I."},{"last_name":"Scharf","full_name":"Scharf, L. L.","first_name":"L. L."}],"date_created":"2023-01-30T11:51:53Z","volume":59,"title":"Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors","doi":"10.1109/TIT.2012.2232705","issue":"4","year":"2013","citation":{"ama":"Ramírez D, Vía J, Santamaría I, Scharf LL. Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors. <i>IEEE Trans\\ Inform\\ Theory</i>. 2013;59(4):2128–2141. doi:<a href=\"https://doi.org/10.1109/TIT.2012.2232705\">10.1109/TIT.2012.2232705</a>","ieee":"D. Ramírez, J. Vía, I. Santamaría, and L. L. Scharf, “Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors,” <i>IEEE Trans.\\ Inform.\\ Theory</i>, vol. 59, no. 4, pp. 2128–2141, 2013, doi: <a href=\"https://doi.org/10.1109/TIT.2012.2232705\">10.1109/TIT.2012.2232705</a>.","chicago":"Ramírez, D., J. Vía, I. Santamaría, and L. L. Scharf. “Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors.” <i>IEEE Trans.\\ Inform.\\ Theory</i> 59, no. 4 (2013): 2128–2141. <a href=\"https://doi.org/10.1109/TIT.2012.2232705\">https://doi.org/10.1109/TIT.2012.2232705</a>.","bibtex":"@article{Ramírez_Vía_Santamaría_Scharf_2013, title={Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors}, volume={59}, DOI={<a href=\"https://doi.org/10.1109/TIT.2012.2232705\">10.1109/TIT.2012.2232705</a>}, number={4}, journal={IEEE Trans.\\ Inform.\\ Theory}, author={Ramírez, D. and Vía, J. and Santamaría, I. and Scharf, L. L.}, year={2013}, pages={2128–2141} }","mla":"Ramírez, D., et al. “Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors.” <i>IEEE Trans.\\ Inform.\\ Theory</i>, vol. 59, no. 4, 2013, pp. 2128–2141, doi:<a href=\"https://doi.org/10.1109/TIT.2012.2232705\">10.1109/TIT.2012.2232705</a>.","short":"D. Ramírez, J. Vía, I. Santamaría, L.L. Scharf, IEEE Trans.\\ Inform.\\ Theory 59 (2013) 2128–2141.","apa":"Ramírez, D., Vía, J., Santamaría, I., &#38; Scharf, L. L. (2013). Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors. <i>IEEE Trans.\\ Inform.\\ Theory</i>, <i>59</i>(4), 2128–2141. <a href=\"https://doi.org/10.1109/TIT.2012.2232705\">https://doi.org/10.1109/TIT.2012.2232705</a>"},"page":"2128–2141","intvolume":"        59"},{"citation":{"ieee":"C. Lameiro, J. Vía, and I. Santamaría, “Amplify-and-Forward Strategies in the Two-Way Relay Channel with Analog Tx-Rx Beamforming,” <i>IEEE Trans. Veh. Techn.</i>, vol. 62, pp. 642–654, 2013, doi: <a href=\"https://doi.org/10.1109/TVT.2012.2226612\">10.1109/TVT.2012.2226612</a>.","chicago":"Lameiro, Christian, Javier Vía, and Ignacio Santamaría. “Amplify-and-Forward Strategies in the Two-Way Relay Channel with Analog Tx-Rx Beamforming.” <i>IEEE Trans. Veh. Techn.</i> 62 (2013): 642–654. <a href=\"https://doi.org/10.1109/TVT.2012.2226612\">https://doi.org/10.1109/TVT.2012.2226612</a>.","ama":"Lameiro C, Vía J, Santamaría I. Amplify-and-Forward Strategies in the Two-Way Relay Channel with Analog Tx-Rx Beamforming. <i>IEEE Trans Veh Techn</i>. 2013;62:642–654. doi:<a href=\"https://doi.org/10.1109/TVT.2012.2226612\">10.1109/TVT.2012.2226612</a>","mla":"Lameiro, Christian, et al. “Amplify-and-Forward Strategies in the Two-Way Relay Channel with Analog Tx-Rx Beamforming.” <i>IEEE Trans. Veh. Techn.</i>, vol. 62, 2013, pp. 642–654, doi:<a href=\"https://doi.org/10.1109/TVT.2012.2226612\">10.1109/TVT.2012.2226612</a>.","short":"C. Lameiro, J. Vía, I. Santamaría, IEEE Trans. Veh. Techn. 62 (2013) 642–654.","bibtex":"@article{Lameiro_Vía_Santamaría_2013, title={Amplify-and-Forward Strategies in the Two-Way Relay Channel with Analog Tx-Rx Beamforming}, volume={62}, DOI={<a href=\"https://doi.org/10.1109/TVT.2012.2226612\">10.1109/TVT.2012.2226612</a>}, journal={IEEE Trans. Veh. Techn.}, author={Lameiro, Christian and Vía, Javier and Santamaría, Ignacio}, year={2013}, pages={642–654} }","apa":"Lameiro, C., Vía, J., &#38; Santamaría, I. (2013). Amplify-and-Forward Strategies in the Two-Way Relay Channel with Analog Tx-Rx Beamforming. <i>IEEE Trans. Veh. Techn.</i>, <i>62</i>, 642–654. <a href=\"https://doi.org/10.1109/TVT.2012.2226612\">https://doi.org/10.1109/TVT.2012.2226612</a>"},"intvolume":"        62","page":"642–654","year":"2013","date_created":"2023-01-30T11:51:54Z","author":[{"last_name":"Lameiro","full_name":"Lameiro, Christian","first_name":"Christian"},{"first_name":"Javier","last_name":"Vía","full_name":"Vía, Javier"},{"first_name":"Ignacio","last_name":"Santamaría","full_name":"Santamaría, Ignacio"}],"volume":62,"date_updated":"2023-01-30T11:58:21Z","doi":"10.1109/TVT.2012.2226612","title":"Amplify-and-Forward Strategies in the Two-Way Relay Channel with Analog Tx-Rx Beamforming","type":"journal_article","publication":"IEEE Trans. Veh. Techn.","status":"public","abstract":[{"lang":"eng","text":"In this paper, we study the multiple-input multiple-output two-way relay channel (MIMO-TWRC) when the nodes and relay use analog beamforming. Following the amplify-andforward (AF) strategy, the problem consists of finding the transmit and receive beamformers of the nodes and relay (as well as the power allocated to each one) that achieve the boundary of the optimal rate region. To solve it, we first express the optimal node beamformers in terms of relay beamformers and then show that the optimal rate region can efficiently be characterized using convex optimization techniques. We also extend our study to the multiple-relay scenario when the source nodes are single antenna and propose a distributed algorithm to compute the relay beamforming matrices. The proposed algorithm consists of solving two different subproblems. First, each individual TWRC is optimized independently. Next, a distributed beamforming is applied to make the signals from the relays add up coherently at the source nodes. Numerical examples are provided to illustrate the performance of the proposed techniques and to compare the performance of analog beamforming architectures against conventional MIMO schemes that operate at the baseband."}],"user_id":"43497","department":[{"_id":"263"}],"_id":"40800"},{"abstract":[{"text":"In this paper we provide an efficient procedure to compute the total number of degrees of freedom (DoF), achievable by linear beamforming, of the $K$-user multiple-input multiple-output (MIMO) interference channel with an arbitrary number of Tx-Rx antennas at each link. Firstly, we derive an analytical outer bound that generalizes the results that exist for the symmetric $K$-user $M\\timesN$ interference channel. Secondly, we obtain a tighter bound by solving a convex optimization problem that includes as constraints the DoF characterizations for point-to-point MIMO links and for 2-user interference channels. The solution to this convex problem admits an interesting waterfilling interpretation. Finally, exploiting this outer bound and using a recently proposed feasibility test, we show that it is possible to obtain the DoF for any interference channel in an efficient way. Some simulations results are included to illustrate the tightness of the derived bounds, as well as to study the DoF achievable for the 4-user channel when we distribute the total number of antennas among users and between transmitters and receivers in different ways.","lang":"eng"}],"status":"public","type":"conference","publication":"Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.","_id":"40793","user_id":"43497","department":[{"_id":"263"}],"place":"Vancouver, Canada","year":"2013","citation":{"ama":"Lameiro C, Vía J, Beltrán C, Santamaría I. Computing the Degrees of Freedom for Arbitrary MIMO Interference Channels. In: <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> ; 2013. doi:<a href=\"https://doi.org/10.1109/ICASSP.2013.6638491\">10.1109/ICASSP.2013.6638491</a>","chicago":"Lameiro, Christian, Javier Vía, Carlos Beltrán, and Ignacio Santamaría. “Computing the Degrees of Freedom for Arbitrary MIMO Interference Channels.” In <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> Vancouver, Canada, 2013. <a href=\"https://doi.org/10.1109/ICASSP.2013.6638491\">https://doi.org/10.1109/ICASSP.2013.6638491</a>.","ieee":"C. Lameiro, J. Vía, C. Beltrán, and I. Santamaría, “Computing the Degrees of Freedom for Arbitrary MIMO Interference Channels,” 2013, doi: <a href=\"https://doi.org/10.1109/ICASSP.2013.6638491\">10.1109/ICASSP.2013.6638491</a>.","mla":"Lameiro, Christian, et al. “Computing the Degrees of Freedom for Arbitrary MIMO Interference Channels.” <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i>, 2013, doi:<a href=\"https://doi.org/10.1109/ICASSP.2013.6638491\">10.1109/ICASSP.2013.6638491</a>.","short":"C. Lameiro, J. Vía, C. Beltrán, I. Santamaría, in: Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process., Vancouver, Canada, 2013.","bibtex":"@inproceedings{Lameiro_Vía_Beltrán_Santamaría_2013, place={Vancouver, Canada}, title={Computing the Degrees of Freedom for Arbitrary MIMO Interference Channels}, DOI={<a href=\"https://doi.org/10.1109/ICASSP.2013.6638491\">10.1109/ICASSP.2013.6638491</a>}, booktitle={Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.}, author={Lameiro, Christian and Vía, Javier and Beltrán, Carlos and Santamaría, Ignacio}, year={2013} }","apa":"Lameiro, C., Vía, J., Beltrán, C., &#38; Santamaría, I. (2013). Computing the Degrees of Freedom for Arbitrary MIMO Interference Channels. <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> <a href=\"https://doi.org/10.1109/ICASSP.2013.6638491\">https://doi.org/10.1109/ICASSP.2013.6638491</a>"},"title":"Computing the Degrees of Freedom for Arbitrary MIMO Interference Channels","doi":"10.1109/ICASSP.2013.6638491","date_updated":"2023-01-30T11:58:08Z","author":[{"full_name":"Lameiro, Christian","last_name":"Lameiro","first_name":"Christian"},{"full_name":"Vía, Javier","last_name":"Vía","first_name":"Javier"},{"last_name":"Beltrán","full_name":"Beltrán, Carlos","first_name":"Carlos"},{"first_name":"Ignacio","full_name":"Santamaría, Ignacio","last_name":"Santamaría"}],"date_created":"2023-01-30T11:51:53Z"},{"_id":"40794","department":[{"_id":"263"}],"user_id":"43497","abstract":[{"lang":"eng","text":"This paper gives a solution to the problem of verifying stability of networks consisting of integral input-to-state stable (iISS) subsystems. The iISS small-gain theorem developed recently has been restricted to interconnections of two subsystems. For large-scale systems, stability criteria relying only on gain-type information that were previously developed address only input-to-state stable (ISS) subsystems. To address the stability problem involving iISS subsystems interconnected in general structure, this paper shows how to construct Lyapunov functions of the network by means of a sum of nonlinearly rescaled individual Lyapunov functions of subsystems under an appropriate small-gain condition."}],"status":"public","publication":"{IEEE} Trans. Autom. Control","type":"journal_article","title":"Robust stability of networks of iISS systems: Construction of sum-type Lyapunov functions","doi":"10.1109/TAC.2012.2231552","date_updated":"2023-01-30T11:58:04Z","volume":58,"author":[{"first_name":"Hiroshi","full_name":"Ito, Hiroshi","last_name":"Ito"},{"full_name":"Jiang, Zhong-Ping","last_name":"Jiang","first_name":"Zhong-Ping"},{"first_name":"Sergey","full_name":"Dashkovskiy, Sergey","last_name":"Dashkovskiy"},{"last_name":"Rüffer","full_name":"Rüffer, Björn S.","first_name":"Björn S."}],"date_created":"2023-01-30T11:51:53Z","year":"2013","page":"1192–1207","intvolume":"        58","citation":{"bibtex":"@article{Ito_Jiang_Dashkovskiy_Rüffer_2013, title={Robust stability of networks of iISS systems: Construction of sum-type Lyapunov functions}, volume={58}, DOI={<a href=\"https://doi.org/10.1109/TAC.2012.2231552\">10.1109/TAC.2012.2231552</a>}, number={5}, journal={{IEEE} Trans. Autom. Control}, author={Ito, Hiroshi and Jiang, Zhong-Ping and Dashkovskiy, Sergey and Rüffer, Björn S.}, year={2013}, pages={1192–1207} }","short":"H. Ito, Z.-P. Jiang, S. Dashkovskiy, B.S. Rüffer, {IEEE} Trans. Autom. Control 58 (2013) 1192–1207.","mla":"Ito, Hiroshi, et al. “Robust Stability of Networks of IISS Systems: Construction of Sum-Type Lyapunov Functions.” <i>{IEEE} Trans. Autom. Control</i>, vol. 58, no. 5, 2013, pp. 1192–1207, doi:<a href=\"https://doi.org/10.1109/TAC.2012.2231552\">10.1109/TAC.2012.2231552</a>.","apa":"Ito, H., Jiang, Z.-P., Dashkovskiy, S., &#38; Rüffer, B. S. (2013). Robust stability of networks of iISS systems: Construction of sum-type Lyapunov functions. <i>{IEEE} Trans. Autom. Control</i>, <i>58</i>(5), 1192–1207. <a href=\"https://doi.org/10.1109/TAC.2012.2231552\">https://doi.org/10.1109/TAC.2012.2231552</a>","ieee":"H. Ito, Z.-P. Jiang, S. Dashkovskiy, and B. S. Rüffer, “Robust stability of networks of iISS systems: Construction of sum-type Lyapunov functions,” <i>{IEEE} Trans. Autom. Control</i>, vol. 58, no. 5, pp. 1192–1207, 2013, doi: <a href=\"https://doi.org/10.1109/TAC.2012.2231552\">10.1109/TAC.2012.2231552</a>.","chicago":"Ito, Hiroshi, Zhong-Ping Jiang, Sergey Dashkovskiy, and Björn S. Rüffer. “Robust Stability of Networks of IISS Systems: Construction of Sum-Type Lyapunov Functions.” <i>{IEEE} Trans. Autom. Control</i> 58, no. 5 (2013): 1192–1207. <a href=\"https://doi.org/10.1109/TAC.2012.2231552\">https://doi.org/10.1109/TAC.2012.2231552</a>.","ama":"Ito H, Jiang Z-P, Dashkovskiy S, Rüffer BS. Robust stability of networks of iISS systems: Construction of sum-type Lyapunov functions. <i>{IEEE} Trans Autom Control</i>. 2013;58(5):1192–1207. doi:<a href=\"https://doi.org/10.1109/TAC.2012.2231552\">10.1109/TAC.2012.2231552</a>"},"issue":"5"},{"year":"2013","place":"Vancouver, Canada","citation":{"bibtex":"@inproceedings{Ramírez_Schreier_Vía_Nikulin_2013, place={Vancouver, Canada}, title={Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections}, DOI={<a href=\"https://doi.org/10.1109/ICASSP.2013.6638864\">10.1109/ICASSP.2013.6638864</a>}, booktitle={Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.}, author={Ramírez, D. and Schreier, P. J. and Vía, J. and Nikulin, V. V.}, year={2013} }","mla":"Ramírez, D., et al. “Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections.” <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i>, 2013, doi:<a href=\"https://doi.org/10.1109/ICASSP.2013.6638864\">10.1109/ICASSP.2013.6638864</a>.","short":"D. Ramírez, P.J. Schreier, J. Vía, V.V. Nikulin, in: Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process., Vancouver, Canada, 2013.","apa":"Ramírez, D., Schreier, P. J., Vía, J., &#38; Nikulin, V. V. (2013). Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections. <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> <a href=\"https://doi.org/10.1109/ICASSP.2013.6638864\">https://doi.org/10.1109/ICASSP.2013.6638864</a>","ama":"Ramírez D, Schreier PJ, Vía J, Nikulin VV. Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections. In: <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> ; 2013. doi:<a href=\"https://doi.org/10.1109/ICASSP.2013.6638864\">10.1109/ICASSP.2013.6638864</a>","chicago":"Ramírez, D., P. J. Schreier, J. Vía, and V. V. Nikulin. “Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections.” In <i>Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.</i> Vancouver, Canada, 2013. <a href=\"https://doi.org/10.1109/ICASSP.2013.6638864\">https://doi.org/10.1109/ICASSP.2013.6638864</a>.","ieee":"D. Ramírez, P. J. Schreier, J. Vía, and V. V. Nikulin, “Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections,” 2013, doi: <a href=\"https://doi.org/10.1109/ICASSP.2013.6638864\">10.1109/ICASSP.2013.6638864</a>."},"date_updated":"2023-01-30T11:58:06Z","author":[{"first_name":"D.","last_name":"Ramírez","full_name":"Ramírez, D."},{"last_name":"Schreier","full_name":"Schreier, P. J.","first_name":"P. J."},{"last_name":"Vía","full_name":"Vía, J.","first_name":"J."},{"full_name":"Nikulin, V. V.","last_name":"Nikulin","first_name":"V. V."}],"date_created":"2023-01-30T11:51:53Z","title":"Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections","doi":"10.1109/ICASSP.2013.6638864","publication":"Proc.\\ IEEE Int.\\ Conf.\\ Acoustics, Speech and Signal Process.","type":"conference","abstract":[{"text":"This work presents a variation of canonical correlation analysis (CCA), where the correlation coefficient between the instantaneous power of the projections is maximized, rather than between the projections themselves. The resulting optimization problem is not convex, and we have to resort to a sub-optimal approach. Concretely, we propose a two-step solution consisting of the singular value decomposition (SVD) of a \"coherence\" matrix followed by a rank-one matrix approximation. This technique is applied to blindly recovering signals in a model that is motivated by the study of neuronal dynamics in humans using electroencephalography (EEG) and magnetoencephalography (MEG). A distinctive feature of this model is that it allows recovery of amplitude-amplitude coupling between neuronal processes.","lang":"eng"}],"status":"public","_id":"40791","department":[{"_id":"263"}],"user_id":"43497"},{"department":[{"_id":"263"}],"user_id":"43497","_id":"40797","status":"public","publication":"Proc.\\ ITG Int.\\ Work. Smart Ant.","type":"conference","title":"Quantization-loss analysis for array signal-source localization","date_created":"2023-01-30T11:51:54Z","author":[{"last_name":"Stein","full_name":"Stein, Manuel","first_name":"Manuel"},{"first_name":"Amine","last_name":"Mezghani","full_name":"Mezghani, Amine"},{"first_name":"Josef A.","full_name":"Nossek, Josef A.","last_name":"Nossek"}],"date_updated":"2023-01-30T11:58:18Z","citation":{"ama":"Stein M, Mezghani A, Nossek JA. Quantization-loss analysis for array signal-source localization. In: <i>Proc.\\ ITG Int.\\ Work. Smart Ant.</i> ; 2013.","chicago":"Stein, Manuel, Amine Mezghani, and Josef A. Nossek. “Quantization-Loss Analysis for Array Signal-Source Localization.” In <i>Proc.\\ ITG Int.\\ Work. Smart Ant.</i> Stuttgart, Germany, 2013.","ieee":"M. Stein, A. Mezghani, and J. A. Nossek, “Quantization-loss analysis for array signal-source localization,” 2013.","bibtex":"@inproceedings{Stein_Mezghani_Nossek_2013, place={Stuttgart, Germany}, title={Quantization-loss analysis for array signal-source localization}, booktitle={Proc.\\ ITG Int.\\ Work. Smart Ant.}, author={Stein, Manuel and Mezghani, Amine and Nossek, Josef A.}, year={2013} }","mla":"Stein, Manuel, et al. “Quantization-Loss Analysis for Array Signal-Source Localization.” <i>Proc.\\ ITG Int.\\ Work. Smart Ant.</i>, 2013.","short":"M. Stein, A. Mezghani, J.A. Nossek, in: Proc.\\ ITG Int.\\ Work. Smart Ant., Stuttgart, Germany, 2013.","apa":"Stein, M., Mezghani, A., &#38; Nossek, J. A. (2013). Quantization-loss analysis for array signal-source localization. <i>Proc.\\ ITG Int.\\ Work. Smart Ant.</i>"},"year":"2013","place":"Stuttgart, Germany"},{"publication":"ION Int.\\ Tech. Meet.","type":"conference","status":"public","_id":"40801","department":[{"_id":"263"}],"user_id":"43497","place":"San Diego, USA","year":"2013","citation":{"ama":"Wendler F, Stein M, Mezghani A, Nossek JA. Quantization-loss reduction for 1-bit BOC positioning. In: <i>ION Int.\\ Tech. Meet.</i> ; 2013.","chicago":"Wendler, Friederike, Manuel Stein, Amine Mezghani, and Josef A. Nossek. “Quantization-Loss Reduction for 1-Bit BOC Positioning.” In <i>ION Int.\\ Tech. Meet.</i> San Diego, USA, 2013.","ieee":"F. Wendler, M. Stein, A. Mezghani, and J. A. Nossek, “Quantization-loss reduction for 1-bit BOC positioning,” 2013.","apa":"Wendler, F., Stein, M., Mezghani, A., &#38; Nossek, J. A. (2013). Quantization-loss reduction for 1-bit BOC positioning. <i>ION Int.\\ Tech. Meet.</i>","short":"F. Wendler, M. Stein, A. Mezghani, J.A. Nossek, in: ION Int.\\ Tech. Meet., San Diego, USA, 2013.","mla":"Wendler, Friederike, et al. “Quantization-Loss Reduction for 1-Bit BOC Positioning.” <i>ION Int.\\ Tech. Meet.</i>, 2013.","bibtex":"@inproceedings{Wendler_Stein_Mezghani_Nossek_2013, place={San Diego, USA}, title={Quantization-loss reduction for 1-bit BOC positioning}, booktitle={ION Int.\\ Tech. Meet.}, author={Wendler, Friederike and Stein, Manuel and Mezghani, Amine and Nossek, Josef A.}, year={2013} }"},"date_updated":"2023-01-30T11:58:16Z","date_created":"2023-01-30T11:51:54Z","author":[{"first_name":"Friederike","last_name":"Wendler","full_name":"Wendler, Friederike"},{"first_name":"Manuel","full_name":"Stein, Manuel","last_name":"Stein"},{"first_name":"Amine","last_name":"Mezghani","full_name":"Mezghani, Amine"},{"first_name":"Josef A.","full_name":"Nossek, Josef A.","last_name":"Nossek"}],"title":"Quantization-loss reduction for 1-bit BOC positioning"}]