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David Ramírez

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Thesis
Ramírez, D., Detection and Estimation of Time Series using a Multi-sensor Array: University of Cantabria, 2011. PDF icon PDF Version (3.59 MB)
Journal Article
Pichler, V., M. Homolák, W. Skierucha, M. Pichlerová, D. Ramírez, J. Gregor, and P. Jaloviar, "Variability of moisture in coarse woody debris from several ecologically important tree species of the Temperate Zone of Europe", Ecohydrology, vol. 5, issue 4, pp. 424–434, July, 2012.
Ramírez, D., D. Romero, J. Vía, R. López-Valcarce, and I. Santamaría, "Testing Equality of Multiple Power Spectral Densities", IEEE Transactions on Signal Processing, vol. 66, issue 23, pp. 6268-6280, December, 2018. PDF icon PDF Version (2.89 MB)
Ramírez, D., P. J. Schreier, J. Vía, and I. Santamaría, "Testing blind separability of complex Gaussian mixtures", Signal Processing, vol. 95, issue 2, pp. 49–57, February, 2014. PDF icon PDF Version (524.56 KB)
Garg, V., I. Santamaría, D. Ramírez, and L. L. Scharf, "Subspace Averaging and Order Determination for Source Enumeration", IEEE Transactions on Signal Processing, vol. 67, issue 11, pp. 3028-3041, June, 2019. PDF icon PDF Version (660.41 KB)
Santamaría, I., L. L. Scharf, and D. Ramírez, "Scale-Invariant Subspace Detectors based on First and Second-Order Statistical Models", IEEE Transactions on Signal Processing, vol. 68, pp. 6432-6443, 2020. PDF icon PDF Version (2.64 MB)
Ramírez, D., and I. Santamaría, "Regularised approach to detection of constant modulus signals in MIMO channels", Electronic Letters, vol. 42, no. 3, pp. 184–186, February, 2006. PDF icon PDF Version (81.58 KB)
Vía, J., D. Ramírez, and I. Santamaría, "Properness and Widely Linear Processing of Quaternion Random Vectors", IEEE Transactions on Information Theory, vol. 56, no. 7, pp. 3502–3515, July, 2010. PDF icon PDF Version (440.87 KB)
Pérez, J., J. Vía, L. Vielva, and D. Ramírez, "Online detection and SNR estimation in cooperative spectrum sensing", IEEE Transactions on Wireless Communications, vol. 21, issue 4, pp. 2521-2533, April, 2022. PDF icon PDF Version (3.44 MB)
Ramírez, D., I. Santamaría, L. L. Scharf, and S. Van Vaerenbergh, "Multi-Channel Factor Analysis with Common and Unique Factors", IEEE Transactions on Signal Processing, vol. 68, issue 1, pp. 113-126, 2020. PDF icon PDF Version (2.53 MB)
Ramírez, D., J. Vía, I. Santamaría, and L. L. Scharf, "Locally Most Powerful Invariant Tests for Correlation and Sphericity of Gaussian Vectors", IEEE Transactions on Information Theory, vol. 59, pp. 2128–2141, April, 2013. PDF icon PDF Version (2.56 MB)
Gutiérrez, J., Ó. González, J. Pérez, D. Ramírez, L. Vielva, J. Ibáñez, and I. Santamaría, "Frequency-Domain Methodology for Measuring MIMO Channels Using a Generic Test Bed", IEEE Transactions on Instrumentation and Measurement, vol. 60, no. 3, pp. 827–838, March, 2011. PDF icon PDF Version (1.14 MB)
Ramírez, D., J. Vía, I. Santamaría, and L. L. Scharf, "Detection of Spatially Correlated Gaussian Time Series", IEEE Transactions on Signal Processing, vol. 58, no. 10, pp. 5006–5015, October, 2010. PDF icon PDF Version (830.05 KB)
Ramírez, D., G. Vazquez-Vilar, R. López-Valcarce, J. Vía, and I. Santamaría, "Detection of Rank-P signals in Cognitive Radio Networks with Uncalibrated Multiple Antennas", IEEE Transactions on Signal Processing, vol. 59, no. 8, pp. 3764–3774, August, 2011. PDF icon PDF Version (974.03 KB)
Ramírez, D., P. J. Schreier, J. Vía, I. Santamaría, and L. L. Scharf, "Detection of Multivariate Cyclostationarity", IEEE Transactions on Signal Processing, vol. 63, issue 20, pp. 5395-5408, October, 2015. PDF icon PDF Version (2.61 MB)
Ramírez, D., I. Santamaría, J. Pérez, J. Vía, J. A. García-Naya, T. M. Fernández-Caramés, H. J. Pérez Iglesias, M. González López, L. Castedo, and J. M. Torres-Royo, "A comparative study of STBC transmissions at 2.4 GHz over indoor channels using a 2 × 2 MIMO testbed", Wireless Communications and Mobile Computing, vol. 8, no. 9, pp. 1149–1164, November, 2008. PDF icon PDF Version (444.92 KB)
Manco-Vásquez, J., M. Lázaro-Gredilla, D. Ramírez, J. Vía, and I. Santamaría, "A Bayesian Approach for Adaptive Multiantenna Sensing in Cognitive Radio Networks", Signal Processing, vol. 96, pp. 240, March, 2014. PDF icon PDF Version (1.05 MB)
Conference Paper
Vía, J., D. Ramírez, I. Santamaría, and L. Vielva, "Widely and semi-widely linear processing of quaternion vectors", IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010), Dallas, USA, March, 2010. PDF icon PDF Version (149.23 KB)
Santamaría, I., L. L. Scharf, V. Garg, and D. Ramírez, "Subspace Averaging in Multi-Sensor Array Processing", SIAM Conference on Applied Algebraic Geometry, Bern, Switzerland, July, 2019. PDF icon PDF Version (1.24 MB)
Santamaría, I., D. Ramírez, and L. L. Scharf, "Subspace Averaging for Source Enumeration in Large Arrays", IEEE Statistical Signal Processing Workshop (SSP), Freiburg, Germany, June, 2018. PDF icon PDF Version (253.86 KB)
Vazquez-Vilar, G., D. Ramírez, R. López-Valcarce, J. Vía, and I. Santamaría, "Spatial rank estimation in Cognitive Radio Networks with uncalibrated multiple antennas", 4th International Conference on Cognitive Radio and Advanced Spectrum Management, Barcelona, Spain, October, 2011. PDF icon PDF Version (140.69 KB)
Garg, V., D. Ramírez, and I. Santamaría, "Sparse subspace averaging for order estimation", IEEE Statistical Signal Processing Workshop, July, 2021. PDF icon PDF Version (256.93 KB)
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", Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, USA, November, 2014. PDF icon PDF Version (192.68 KB)
Ramírez, D., P. J. Schreier, J. Vía, and V. V. Nikulin, "Power-CCA: Maximizing the Correlation Coefficient between the Power of Projections", IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013), Vancouver, Canada, May, 2013. PDF icon PDF Version (216.43 KB)
García-Naya, J. A., T. M. Fernández-Caramés, H. J. Pérez Iglesias, M. González López, L. Castedo, D. Ramírez, I. Santamaría, J. Pérez, J. Vía, and J. M. Torres-Royo, "Performance of STBC transmissions with real data", 16th IST Mobile & Wireless Communications Summit, Budapest, Hungary, July, 2007. PDF icon PDF Version (307.49 KB)
Ramírez, D., I. Santamaría, and L. L. Scharf, "Passive Detection of Rank-one Gaussian Signals for Known Channel Subspaces and Arbitrary Noise", IEEE International Conference on Acoustics Speech and Signal Processing, Rhodes, Greece, June, 2023. PDF icon PDF Version (236.7 KB)
Santamaría, I., V. Elvira, J. Vía, D. Ramírez, J. Pérez, J. Ibáñez, R. Eickhoff, and F. Ellinger, "Optimal MIMO transmission schemes with adaptive antenna combining in the RF path", 16th European Signal Processing Conference (EUSIPCO 2008), Lausanne, Switzerland, August, 2008. PDF icon PDF Version (200.02 KB)
Ramírez, D., J. Vía, I. Santamaría, and L. L. Scharf, "Multi-Sensor Beamsteering Based on the Asymptotic Likelihood for Colored Signals", IEEE Workshop on Statistical Signal Processing (SSP 2011), Nice, France, June, 2011. PDF icon PDF Version (448.28 KB)
Ramírez, D., J. Vía, and I. Santamaría, "Multiple-Channel Signal Detection using the Generalized Coherence spectrum", 1st IAPR Workshop on Cognitive Information Processing (CIP 2008), Santorini, Greece, June, 2008. PDF icon PDF Version (152.19 KB)
Ramírez, D., J. Vía, I. Santamaría, and L. L. Scharf, "Multiple-Channel Detection of a Gaussian Time Series over Frequency-Flat Channels", IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2011), Prague, Czech Republic, May, 2011. PDF icon PDF Version (147.71 KB)
Ramírez, D., J. Vía, and I. Santamaría, "Multiantenna spectrum sensing: The case of wideband rank-one primary signals", 6th IEEE Sensor Array and Multichannel Signal Processing Workshop, Israel, October, 2010. PDF icon PDF Version (243.67 KB)
Ramírez, D., J. Vía, I. Santamaría, R. López-Valcarce, and L. L. Scharf, "Multiantenna Spectrum Sensing: Detection of Spatial Correlation Among Time-Series With Unknown Spectra", IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2010), Dallas, USA, March, 2010. PDF icon PDF Version (225.59 KB)
Ramírez, D., G. Vazquez-Vilar, R. López-Valcarce, J. Vía, and I. Santamaría, "Multiantenna Detection under Noise Uncertainty and Primary Users Spatial Structure", IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2011), Prague, Czech Republic, May, 2011. PDF icon PDF Version (105.83 KB)
Ramírez, D., D. Romero, J. Vía, R. López-Valcarce, and I. Santamaría, "Locally Optimal Invariant Detector for Testing Equality of Two Power Spectral Densities", IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Calgary, Canada, IEEE, April, 2018. PDF icon PDF Version (264.58 KB)
Ramírez, D., J. Vía, and I. Santamaría, "The Locally Most Powerful Test For Multiantenna Spectrum Sensing With Uncalibrated Receivers", IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2012), Kyoto, Japan, March, 2012. PDF icon PDF Version (99.96 KB)
Ramírez, D., J. Iscar, J. Vía, I. Santamaría, and L. L. Scharf, "The Locally Most Powerful Invariant Test for Detecting a Rank-P Gaussian Signal in White Noise", 7th IEEE Sensor Array and Multichannel Signal Processing Workshop, Hoboken, NJ, USA, June, 2012. PDF icon PDF Version (378.62 KB)
Vía, J., D. Ramírez, I. Santamaría, and L. Vielva, "Improperness Measures for Quaternion Random Vectors", IEEE International Workshop on Machine Learning for Signal Processing (MLSP 2010), Kittilä, Finland, August, 2010. PDF icon PDF Version (370.95 KB)
Stanton, G., D. Ramírez, I. Santamaría, L. L. Scharf, and H. Wang, "Identifiability in Multi-Channel Factor Analysis", Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, USA, November, 2023. PDF icon PDF Version (305.28 KB)
Ramírez, D., P. J. Schreier, J. Vía, and I. Santamaría, "GLRT For Testing Separability Of A Complex-Valued Mixture Based On The Strong Uncorrelating Transform", 2012 IEEE International Workshop on Machine Learning for Signal Processing, Santander, Spain, September, 2012. PDF icon PDF Version (274.68 KB)
Ramírez, D., J. Vía, and I. Santamaría, "A generalization of the magnitude squared coherence spectrum for more than two signals: definition, properties and estimation", IEEE Int. Conf. on Acoust., Speech, and Signal Processing (ICASSP 2008), Las Vegas, USA, April, 2008. PDF icon PDF Version (250.67 KB)
Ramírez, D., I. Santamaría, J. Pérez, J. Vía, A. Tazón, J. A. Garcia-Naya, T. M. Fernández-Caramés, M. González López, H. J. Pérez Iglesias, and L. Castedo, "A flexible testbed for the rapid prototyping of MIMO baseband modules", 3rd International Symposium on Wireless Communication Systems (ISWCS 2006), Valencia, Spain, September, 2006. PDF icon PDF Version (908.74 KB)
González, Ó., D. Ramírez, I. Santamaría, J. A. García-Naya, and L. Castedo, "Experimental Validation of Interference Alignment Techniques using a Multiuser MIMO Testbed", International ITG Workshop on Smart Antennas (WSA 2011), Aachen, Germany, February, 2011. PDF icon PDF Version (1.39 MB)
García-Naya, J. A., L. Castedo, Ó. González, D. Ramírez, and I. Santamaría, "Experimental Evaluation of Interference Alignment Under Imperfect Channel State Information", 19th European Signal Processing Conference (EUSIPCO 2011), Barcelona, Spain, August, 2011. PDF icon PDF Version (398.93 KB)
Ramírez, D., J. Vía, I. Santamaría, and P. Crespo, "Entropy and Kullback-Leibler divergence estimation based on Szegö´s Theorem", 17th European Signal Processing Conference (EUSIPCO 2009), Glasgow, Scotland, August, 2009. PDF icon PDF Version (278.85 KB)
Ramírez, D., J. Vía, and I. Santamaría, "Coherent Fusion of Information for Optimal Detection in Sensor Networks", IEEE Workshop on Statistical Signal Processing (SSP 09), Cardiff, UK, September, 2009. PDF icon PDF Version (426.64 KB)
Vía, J., I. Santamaría, J. Pérez, and D. Ramírez, "Blind decoding of MISO-OSTBC systems based on principal component analysis", IEEE Int. Conf. on Acoust., Speech, and Signal Processing (ICASSP 2006), Toulouse, France, May, 2006. PDF icon PDF Version (185.62 KB)
Manco-Vásquez, J., M. Lázaro-Gredilla, D. Ramírez, J. Vía, and I. Santamaría, "Bayesian Multiantenna Sensing for Cognitive Radio", 7th IEEE Sensor Array and Multichannel Signal Processing Workshop, Hoboken, NJ, USA, June, 2012. PDF icon PDF Version (296.83 KB)
Ramírez, D., P. J. Schreier, J. Vía, I. Santamaría, and L. L. Scharf, "An asymptotic LMPI test for cyclostationarity detection with application to cognitive radio", IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Brisbane, Australia, April, 2015. PDF icon PDF Version (259.68 KB)
Ramírez, D., L. L. Scharf, J. Vía, I. Santamaría, and P. J. Schreier, "An asymptotic GLRT for the detection of cyclostationary signals", International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Florence, Italy, May, 2014. PDF icon PDF Version (292.46 KB)
Ramírez, D., I. Santamaría, S. Van Vaerenbergh, and L. L. Scharf, "An alternating optimization algorithm for two-channel factor analysis with common and uncommon factors", 52nd Asilomar Conference on Signals, Systems and Computers, Pacific Grove (CA), USA, IEEE, October, 2018. PDF icon PDF Version (206.51 KB)

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