Research Interests

• General Signal and Information Processing: Sampling and efficient signal representation, Oversampled A/D conversion, design and application of wavelet filter banks, frames, robust signal classification, statistical inference and data mining.
  

• Distributed Signal Processing and Communications for Networks: Wireless sensor networks (WSNs), distributed source-channel coding for wireless networks, decentralized routing and MAC algorithms, network correlated data-gathering, co-operative processing and in-network inference under communication constraints, MIMO systems, heterogeneous networks, Game theory in networks, complexity analysis and approximation algorithms in network problems, Implementation of WSN Testbeds.

• Information Theory and General Communications: Lattices and its applications (Rate-Distortion and channel coding), joint source-channel coding, information science of complex dynamic systems, co-operative diversity in communications, Cognitive radios, network capacity related issues, iterative message-passing based coding systems, Computation over channels.

Research Projects and Funding

• Ministry of Science and Innovation of Spain - CONSOLIDER Project
  
• Foundations and Methodologies for Future Communication and Sensor Networks (COMONSENS)
• Institutions involved: UPC, UVEG, UPF, UPM, UC3M, UC, UDC, UVigo, US, UNavarra
• Ministry of Science and Innovation of Spain
  
• Collaborative processing and Self-organized communications for Wireless Sensor Networks (SOFIWORKS)
• Wireless Sensor Networks for Cognitive Radios: Fundamental Theory and Design of Algorithms (SENSECOGNITIVE)
  
• Thematic Network: Information & Communication Theory and Technologies (INFOCOM)
• Cooperative and Cognitive Interference Management Strategies for Wireless Communication Networks (COSIMA)
  
• European Commission, FP7-PEOPLE-2009-IEF
• Wireless Sensor Networks for Cognitive Software Radios (WISERNETS)
  
• European Commission, FP6 D2002-Mobility-3
• Collaborative Signal Processing for Efficient Wireless Networks (ASPIRE)
  
• European Commission, FP6 NoE-IST-4-027738
• Creating Ubiquitous Intelligent Sensing Applications (CRUISE)
  
• European Commission, FP7-ICT-2007-1-1.1 (Network of the Future)
• Sensor Network for Dynamic and Cognitive Radio Access (SENDORA)
  
• Deutsche Telekom
• In-network distributed processing under communication constraints
  
• Ministry of Work and Social Affairs
• Intelligent and Accessible Environments (EINA), in cooperation with AVAPACE.
  
• Ministry of Industry, Turism and Commerce (Plan Avanza I+D)
  
• Environmental Surveillance through dense Wireless Sensor Networks I (VARIMOS I)
• Environmental Surveillance through dense Wireless Sensor Networks II (VARIMOS II)
• Ministry of Public Works
• Intelligent System for Traffic Signalling and Information (CABINTEC)
• Regional Government of Valencia (Regional Ministry of Enterprise, University & Science)
• Novel research directions in Telecommunications within Comunidad Valenciana

Publications

• Ph.D. Thesis:

• B. Beferull-Lozano. Quantization Design for Structured Overcomplete Expansions, Ph.D. Thesis, Department of Electrical Engineering, University of Southern California (USC), October 2002 (Best PhD Thesis paper Award at USC).
  

• Journal Papers

• B. Beferull-Lozano and A. Ortega, Efficient Quantization for Overcomplete Expansions in R^N, IEEE Transactions on  Information Theory, Vol. 49, No. 1, pp. 129-150, January, 2003.

• N.J.A. Sloane and B. Beferull-Lozano, Quantizing using lattice intersections, Discrete and Computational Geometry, Vol. 25, pp. 799-824, June 2003.

• R. Cristescu, B. Beferull-Lozano and M. Vetterli, Networked Slepian-Wolf: Theory, Algorithms and Scaling Laws, IEEE Transactions on Information Theory, Vol. 51, no. 12, pp. 4057-4073, December 2005.

• R. Cristescu, B. Beferull-Lozano, M. Vetterli and R. Wattenhofer, Network Correlated Data Gathering with Explicit Communication: NP-Completeness and Algorithms, IEEE/ACM Transactions on Networking, Vol. 14, no. 1, February 2006.

• I. Jovanovic and B. Beferull-Lozano, Oversampled A/D Conversion and Error-Rate Dependence of Non-Bandlimited Signals with Finite Rate of Innovation. IEEE Transactions on Signal Processing, Vol. 54, no. 5, May 2006.

• G. Barrenechea, B. Beferull-Lozano and M. Vetterli, Lattice Networks: Capacity Limits, Optimal Routing and Queueing behavior. IEEE/ACM Transactions on Networking, Vol. 14, no. 3, June 2006.

• D. Ganesan, R. Cristescu and B. Beferull-Lozano, Power-Efficient Sensor Placement and Transmission Structure for Data Gathering under Distortion Constraints. ACM Transactions on Sensor Networks, Vol. 2, no. 2, May 2006.

• V. Velisavljevic, B. Beferull-Lozano, M. Vetterli and P.L. Dragotti, Directionlets: Anisotropic Multidirectional Representation with Separable Filtering, IEEE Transactions on Image Processing, Vol. 15, no. 7, July 2006.

• G. Tzagkarakis, B. Beferull-Lozano and P. Tsakalides, Rotation-Invariant Texture retrieval with gaussianized steerable pyramids, IEEE Transactions on Image Processing, Vol. 15, no. 9, September 2006.

• R. Cristescu and B. Beferull-Lozano, Lossy Network Correlated Data Gathering with High-Resolution Coding, IEEE Transactions on Information Theory, Vol. 52, no. 6, June 2006.

• V. Velisavljevic, B. Beferull-Lozano, M. Vetterli, Space-Frequency Quantization for Image Compression with Directionlets, IEEE Transactions on Image Processing, Vol. 16, no. 7, July 2007.

• G. Tzagkarakis, B. Beferull-Lozano and P. Tsakalides, Rotation-Invariant Texture retrieval via Signature Alignment based on Steerable Sub-gaussian modelling, IEEE Transactions on Image Processing, Vol. 17, no. 7, July 2008.

• B. Beferull-Lozano, R. Konsbruck, On Multiterminal source coding for temperature sensing in shift-invariant geometries, IEEE Transactions on Communications, February 2011.
  

• C. Asensio, B. Beferull-Lozano, Accelerating average consensus by sparsifying the connectivity in wireless sensor network, Submitted to IEEE Transactions on Signal Processing.

• I. Khalife, B. Beferull-Lozano, Joint Power-Aware Routing and Cooperative Detection in Cognitive Radios, Submitted to IEEE/ACM Transactions on Networking.

• X. Huang, B. Beferull-Lozano, Non-cooperative Power Allocation Games for OFDM-based Games based on Sensing Information, Submitted to IEEE Transactions on Signal Processing.
  

• Book Chapters and Edited Volumes
  

• V. Velisavljevic, M. Vetterli, B. Beferull, P.L. Dragotti, Sparse Image Representation by Directionlets. Elsevier Advances in Imaging and Electron Physics, editor Peter Hawkes, vol. 161-04, chapter 4, pp. 147-209, March 2010.

• R. Cristescu, B. Beferull-Lozano and M. Vetterli, Networked Slepian-Wolf: Theory and Algorithms, Edited Volume in Springer Verlag, Lecture Notes in Computer Science, Vol. 2920, Eds. H. Karl, A. Willig, A. Wolisz, January 2004.

• N.J.A. Sloane and B. Beferull-Lozano, Quantizing using lattice intersections, Discrete and Computational Geometry - The Goodman-Pollack Festschrift, Vol. 25, B. Aronov, S. Basu, J. Pach, M. Sharir, pp. 799-824, June 2003.

• Conference Papers

• X. Huang, B. Beferull-Lozano, Non-cooperative Power Allocation Game with Imperfect Sensing Information for Cognitive Radios, IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Prague, 2011.

• I. Khalife, B. Beferull-Lozano, Closed-form Approximations for Cooperative LLR-based Energy Detection in Cognitive Radios, IEEE International Conference on Communications, Kyoto, 2011.

• A. Erdozain, P. M. Crespo, B. Beferull-Lozano, Analog Joint Source-Channel Multiple Description Coding Scheme over AWGN Parallel Channels, IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Prague, 2011.

• C. Asensio, B. Beferull-Lozano, Accelerating consensus gossip algorithms: sparsifying networks can be good for you, IEEE International Conference on Communications, 2010.

• E. Portu-Repollés, B. Beferull-Lozano, “Joint sensor selection and Routing for Distributed Estimation in Wireless Sensor Networks”, Eusipco 2009, Glasgow, Scotland, August 2009.
  

• K. Flouri, B. Beferull-Lozano and P. Tsakalides, Optimal Gossip Algorithm for Distributed Consensus SVM Training in Wireless Sensor Networks, IEEE International Conference on Digital Signal Processing, Greece, 2009.

• K. Flouri, B. Beferull-Lozano and P. Tsakalides, Distributed Consensus Algorithms for SVM Training in Wireless Sensor Networks, EUSIPCO, Lausanne, 2008.

• V. Velisavljevic, B. Beferull-Lozano, M. Vetterli, Space-Frequency Quantization using Directionlets, IEEE International Conference on Image Processing, 2007.

• V. Velisavljevic, B. Beferull-Lozano, M. Vetterli, P.L. Dragotti, Low-Rate Reduced Complexity Image Compression using Directionlets, IEEE International Conference on Image Processing, Atlanta 2006.

• K. Flouri, B. Beferull-Lozano and P. Tsakalides. Training a SVM-based Classifier in Distributed Sensor Networks, EUSIPCO 2006, Florence, 2006.

• K. Flouri, B. Beferull-Lozano and P. Tsakalides. Power-efficient distributed Support Vector Machines for Wireless Sensor Networks, European Workshop on Sensor Networks (EWSN), 2006.

• J. Acimovic, B. Beferull-Lozano and R. Cristescu. Adaptive distributed algorithms for power-efficient data gathering in sensor networks, IEEE International Symposium on Wireless Sensor Networks, WirelessCom 2005, Hawai.

• V. Velisavljevic, B. Beferull-Lozano, M. Vetterli and P.L. Dragotti. Approximation power of Directionlets, in Proc. of IEEE International Conference on Image Processing (ICIP), Genova, September 2005.

• G. Barrenetxea, B. Beferull-Lozano and M. Vetterli. Efficient routing with small buffers in dense networks, in Proc. of IEEE and ACM International Symposium on Information Processing in Sensor networks (IPSN), April 2005, Los Angeles, CA.

• R. Cristescu, B. Beferull-Lozano. Lossy network correlated data gathering with high-resolution coding, in Proc. of IEEE and ACM International Symposium on Information Processing in Sensor networks (IPSN), April 2005, Los Angeles, CA.

• R. Cristescu, B. Beferull-Lozano, M. Vetterli, D. Ganesan and J. Acimovic.On the interaction of data representation and routing in sensor networks, in Proc. of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Pennsylvania, 2005.

• E. Baccaglini, G. Barrenechea and B. Beferull-Lozano.Interaction between multiple description coding and sensor networks with finite buffers, in Proc. of IEEE International Conference on Multimedia & Expo (ICME), 2005.

• J. Acimovic, R. Cristescu and B. Beferull-Lozano. Efficient Distributed Multiresolution processing for data gathering in sensor networks, in Proc. of  IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Pennsylvania, 2005.

• G. Tzagkarakis, B. Beferull-Lozano and P. Tsakalides, Rotation-Invariant Texture retrieval with gaussianized steerable pyramids,  in Proc. of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2005.

• G. Tzagkarakis, B. Beferull-Lozano and P. Tsakalides, Sub-gaussian rotation-invariant features for steerable wavelet-based image retrieval, in Proc. of the International Asilomar Conference, November 2004.

• Baltasar Beferull-Lozano, Robert L. Konsbruck and M. Vetterli, Rate-Distortion Problem for Physics Based Distributed Sensing, in Proc. of IEEE and ACM International Symposium on Information Processing in Sensor Networks (IPSN), April 2004, Berkeley, CA.

• I. Jovanovic and B. Beferull-Lozano, Error-Rate Dependence of Non-Bandlimited Signals with Finite Rate of Innovation, in Proc. of IEEE International Symposium on Information Theory (ISIT), 2004.
  

• I. Jovanovic and B. Beferull-Lozano. Oversampled A/D Conversion of Non-Bandlimited Signals with Finite Rate of Innovation, in Proc. of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Montreal, 2004.

• G. Barrenechea, B. Beferull-Lozano and M. Vetterli, Lattice Sensor Networks: Capacity Limits, Optimal Routing and Robustness to Failures, in Proc. of IEEE and ACM International Symposium on Information Processing in Sensor Networks (IPSN), April 2004, Berkeley, CA.

• R. Cristescu, B. Beferull-Lozano and M. Vetterli, On Network Correlated Data Gathering, in Proc. of  INFOCOM, 2004, Hong Kong.

• R. Cristescu, B. Beferull-Lozano and M. Vetterli, Networked Slepian-Wolf: Theory and Algorithms, in Proc. of European Workshop in Sensor Networks (EWSN), Berlin, Germany, 2004, also as Edited Volume in Springer-Verlag Lecture Notes in Computer Science, Vol. 2920.

• R. Cristescu, B. Beferull-Lozano and M. Vetterli, Scaling Laws for Correlated Data Gathering, in Proc. of IEEE International Symposium on Information Theory (ISIT), 2004.

• D. Ganesan, R. Cristescu and B. Beferull-Lozano, Power-Efficient Sensor Placement and Transmission Structure for Data Gathering under Distortion Constraints, in Proc. of IEEE and ACM International Symposium on Information Processing in Sensor Networks (IPSN), 2004, Berkeley, CA.

• B. Beferull-Lozano, R. L. Konsbruck and M. Vetterli, Rate-Distortion Problem for Physics Based Distributed Sensing, IEEE Conference on Acoustics, Speech and Signal Processing (IPSN), Invited paper, Special Session on Distributed signal processing for sensor networks, May 2004, Montreal, Canada.

• V. Velisavljevic, B. Beferull-Lozano, M. Vetterli and P. L. Dragotti, Discrete Multi-directional Wavelet Bases, in Proc. of IEEE International Conference on Image Processing (ICIP), Barcelona, Spain, September 2003.

• B. Beferull-Lozano, H. Xie and A. Ortega. Rotation-Invariant Features based on Steerable Transforms with an application to distributed image classification. In Proc. of IEEE International Conference on Image Processing (ICIP), Barcelona, September, 2003.

• B. Beferull-Lozano, S. Diggavi. Nested trellis codes and shaping for the transmitter side-information problem, in Proc. of International Symposium on Information Theory (ISIT), 2003.

• G. Barrenechea, B. Beferull-Lozano, A. Verma, P. L. Dragotti and M. Vetterli, Multiple Description Source Coding and Diversity Routing: A Joint Source Channel Coding Approach to Real-Time Services over Dense Networks, Proc. 13th International Packet Video Workshop, April 2003, Nantes, France.

• Z. Cvetkovic, B.Beferull-Lozano and A. Buja. Robust phoneme discrimination using acoustic waveforms,  in Proc. of IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2002.

• B. Beferull-Lozano and A. Ortega. Construction of Low Complexity Regular Quantizers for Overcomplete Expansions in R^N, in Proc. of  IEEE Data Compression Conference (DCC), Snowbird, Utah, 2001.
  

• B. Beferull-Lozano and A. Ortega. Efficient Quantization for Overcomplete Expansions in R^N, in Proc. of  IEEE International Conference on Acoustics, Speech and Signal Processing, Salt Lake City, Utah, 2001.

• A. Ortega, B. Beferull-Lozano, N. Srinivasamurthy, H. Xie. Compression for Recognition and Content-based Retrieval, in Proc. of Eusipco International Conference, Tampere, Finland, 2000.

• B. Beferull-Lozano and A. Ortega. Coding Techniques for Oversampled Steerable Transforms, in Proc. of thirty-third International Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, October 1999.

• S. Felici, B. Beferull-Lozano, J. Martinez, G. Martin. "An Adaptative Video Compression algorithm based on Wavelet Filter Banks for Best Effort Networks", in Proc. of SoftCOM98, International Conference on Software in Telecommunications and Computer Networks, Bari, Italy, 1998.

• B. Beferull-Lozano, E. Bonet, V. Sos, F. Toledo. "An approach to an Orange Classifier based on the Discrete Gabor Wavelet Transform", in Proc. of VII National Symposium on Pattern Recognition and Image Analysis, Barcelona, Spain, April 1997.

• Technical Reports

• B. Beferull-Lozano. Subband Image Coding and Multiscale Perceptual Models, Department of Electronics and Computer Science, University of Valencia, Valencia, Spain, 1997.

• B. Beferull-Lozano and Z. Cvetkovic. Geometric studies of speech and separability of phonemes, AT&T Shannon Laboratory, Information Science Center, January 2002.