2012
Bilinear modelling via Augmented Lagrange Multipliers (BALM)
A. del Bue, J. Xavier, L. Agapito and M. Stosic
IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 34, no.8, pp. 1496-1508, 2012
Distributed basis pursuit
J. Mota, J. Xavier, P. Aguiar and M. Püschel
IEEE Transactions on Signal Processing, vol. 60, no.4, pp. 1942-1956, 2012
Large deviations performance of consensus+innovations distributed detection with non-Gaussian observations
D. Bajovic, D. Jakovetic, J. M. F. Moura, J. Xavier and B. Sinopoli
IEEE Transactions on Signal Processing, vol. 60, no. 11, pp. 5987-6002, 2012
Distributed detection over noisy networks: large deviations analysis
D. Jakovetic, J. M. F. Moura and J. Xavier
IEEE Transactions on Signal Processing, vol. 60, no. 8, pp. 4306-4320, 2012
Optimal metric projections for deformable and articulated structure-from-motion
M. Paladini, A. del Bue, J. Xavier, L. Agapito, M. Stosic and M. Dodig
International Journal of Computer Vision, vol. 96, no. 2, 2012
ADMM for consensus on colored networks
J. Mota, J. Xavier, P. Aguiar and M. Püschel
51th IEEE Conference on Decision and Control - CDC'12, Hawaii, USA, December 2012
Distributed ADMM for model predictive control and congestion control
J. Mota, J. Xavier, P. Aguiar and M. Püschel
51th IEEE Conference on Decision and Control - CDC'12, Hawaii, USA, December 2012
Distributed Nesterov-like gradient algorithms
D. Jakovetic, J. M. F. Moura and J. Xavier
51th IEEE Conference on Decision and Control - CDC'12, Hawaii, USA, December 2012
Exact rate for convergence in probability of averaging processes via generalized min-cut
D. Bajovic, J. Xavier, J. M. F. Moura and B. Sinopoli
51th IEEE Conference on Decision and Control - CDC'12, Hawaii, USA, December 2012
Consensus+innovations detection: phase transition under communication noise
D. Jakovetic, J. M. F. Moura and J. Xavier
50th Allerton Conference on Communication, Control, and Computing, Illinois, USA, October 2012
Products of stochastic matrices: large deviation rate for markov chain temporal dependencies
D. Bajovic, J. Xavier and B. Sinopoli
50th Allerton Conference on Communication, Control, and Computing, Illinois, USA, October 2012
D-ADMM: a distributed algorithm for compressed sensing and other separable optimization problems
J. Mota, J. Xavier, P. Aguiar and M. Püschel
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'12, Kyoto, Japan March 2012
Fast cooperative distributed learning
D. Jakovetic, J. M. F. Moura and J. Xavier
Asilomar Conference on Signals, Systems and Computers, California, USA, November 2012
Distributed learning in large-scale multi-agent games: a modified fictitious play approach
B. Swenson, S. Kar and J. Xavier
Asilomar Conference on Signals, Systems and Computers, California, USA, November 2012
6D pose estimation of textureless shiny objects using random ferns for bin-picking
J. Rodrigues, J-S Kim, M. Furukawa, J. Xavier, P. Aguiar and T. Kanade
IEEE/RSJ International Conference on Intelligent Robots and Systems - IROS'12, Vilamoura, Portugal, October 2012
Filter design with secrecy constraints: zero-forcing constraint at the legitimate receiver
H. Reboredo, M. Rodrigues and J. Xavier
IEEE International Workshop on Signal Processing Advances for Wireless Communications - SPAWC'12, Turkey, June 2012
Convergence rate analysis of distributed gradient methods for smooth optimization
D. Jakovetic, J. Xavier and J. M. F. Moura
20th Telecommunications Forum - TELFOR'12, Belgrade, Serbia, November 2012
Products of stochastic matrices: exact rate of convergence in probability for directed networks
D. Bajovic, J. Xavier and B. Sinopoli
20th Telecommunications Forum - TELFOR'12, Belgrade, Serbia, November 2012
2011
Distributed detection via Gaussian running consensus: large deviations asymptotic analysis
D. Bajovic, D. Jakovetic, J. Xavier, B. Sinopoli and J. M. F. Moura
IEEE Transactions on Signal Processing, vol. 59, no.9, pp. 4381-4396, 2011
Sensor selection for event detection in wireless sensor networks
D. Bajovic, B. Sinopoli and J. Xavier
IEEE Transactions on Signal Processing, vol. 59, no. 10, pp. 4938-4953, 2011
Cooperative convex optimization in networked systems: augmented Lagrangian algorithms with directed gossip communication
D. Jakovetic, J. Xavier and J. M. F. Moura
IEEE Transactions on Signal Processing, vol. 59, no.8, pp. 3889-3902, 2011
Robust localization of nodes and time-recursive tracking in sensor networks using noisy range measurements
P. Oguz, J. Gomes, J. Xavier and P. Oliveira
IEEE Transactions on Signal Processing, vol. 59, no.8, pp. 3930-3942, 2011
Large deviations analysis of consensus+innovations detection in random networks
D. Bajovic, D. Jakovetic, J. M. F. Moura, J. Xavier and B. Sinopoli
49th Allerton Conference on Communication, Control, and Computing, Illinois, USA, September 2011
Asymptotic performance of distributed detection over random networks
D. Bajovic, D. Jakovetic, J. Xavier, B. Sinopoli and J. M. F. Moura
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'11, Prague, Czech Republic, May 2011
Basis pursuit in sensor networks
J. Mota, J. Xavier, P. Aguiar and M. Püschel
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'11, Prague, Czech Republic, May 2011
Filter design with secrecy constraints: the MIMO Gaussian wiretap channel with zero-forcing receive filters
H. Reboredo, V. Prabhu, M. Rodrigues and J. Xavier
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'11, Prague, Czech Republic, May 2011
Filter design with secrecy constraints: the degraded MIMO Gaussian wiretap channel
H. Reboredo, M. Rodrigues, M. Ara and J. Xavier
IEEE 73rd Vehicular Technology Conference - VTC'11, Budapest, Hungary, May 2011
Design of filters for reliable and secure communications: conditional mean estimation at the eavesdropper
H. Reboredo, M. Rodrigues and J. Xavier
IEEE EUROCON International Conference on Computer as a Tool -- EUROCON 2011, 2001
Applications of Riemannian geometry in signal processing
J. Xavier
3rd International Conference on "Geometry, Dynamics and Integrable Systems", GDIS'11, Lisbon, Portugal, September 2011
Convergence analysis of BALM
J. Xavier, A. del Bue, L. Agapito and M. Paladini
Technical report, Signal and Image Processing Group (SPIG), Institute for Systems and Robotics (ISR), October 2011
2010
Weight optimization for consensus algorithms with correlated switching topology
D. Jakovetic, J. Xavier and J. M. F. Moura
IEEE Transactions on Signal Processing, vol. 58, no.7, pp. 3788-3801, 2010
Distributed detection over random networks: a large deviations analysis
D. Bajovic, D. Jakovetic, J. Xavier, B. Sinopoli and J. M. F. Moura
48th Allerton Conference on Communication, Control, and Computing, Illinois, USA, October 2010
Bilinear factorization via augmented Lagrange multipliers
A. del Bue, J. Xavier, L. Agapito and M. Paladini
11th European Conference on Computer Vision - ECCV'10, Crete, Greece, September 2010
Consensus in correlated random topologies: weights for finite time horizon
D. Jakovetic, J. Xavier and J. M. F. Moura
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'10, Dallas, Texas, USA, March 2010
A convex relaxation for approximate maximum-likelihood 2D source localization from range measurements
P. Ekim, J. Gomes, J. Xavier and P. Oliveira
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'10, Dallas, Texas, USA, March 2010
2009
Robust linear dimensionality reduction for hypothesis testing with application to sensor selection
D. Bajovic, B. Sinopoli and J. Xavier
47th Allerton Conference on Communication, Control, and Computing, Illinois, USA, October 2009
Sensor selection for hypothesis testing in wireless sensor networks: a Kullback-Leibler based approach
D. Bajovic, B. Sinopoli and J. Xavier
48th IEEE Conference on Decision and Control - CDC'09, Shangai, China, December 2009
Distributed algorithms for basis pursuit
J. Mota, J. Xavier, P. Aguiar and M. Püschel
2nd International Workshop on Signal Processing with Adaptive Sparse Structured Representations, Saint-Malo, France, April 2009
Factorization for non-rigid and articulated structure using metric projections
M. Paladini, A. del Bue, M. Stosic, M. Dodig, J. Xavier and L. Agapito
IEEE Computer Society Conference on Computer Vision and Pattern Recoginition - CVPR'09, Miami, Florida, USA, June 2009
Reconstruction of isometrically deformable flat surfaces in 3D from multiple camera images
R. Ferreira, J. Xavier and J. P. Costeira
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'09, Taipei, Taiwan, April 2009
Shape from motion of nonrigid objects: the case of isometrically deformable flat surfaces
R. Ferreira, J. Xavier and J. P. Costeira
British Machine Vision Conference - BMVC'09, London, England, September 2009
Codebook design for communication in spread and nonspread space-time block codes-based systems
M. Beko, J. Xavier and V. Barroso
6th IEEE International Symposium on Wireless Communication Systems - ISWCS'09, Siena-Tuscany, Italy, September 2009
ML based sensor network localization and tracking: batch and time-recursive approaches
P. Ekim, J. Gomes, J. Xavier and P. Oliveira
17th European Signal Processing Conference - EUSIPCO'09, Glasgow, Scotland, August 2009
2D-3D registration of deformable shapes with manifold projection
A. del Bue, M. Stosic, M. Dodig and J. Xavier
IEEE International Conference on Image Processing - ICIP'09, Cairo, Egypt, November 2009
On minimizing a quadratic function on Stiefel manifolds
M. Dodig, M. Stosic and J. Xavier
Technical report, Signal and Image Processing Group (SPIG), Institute for Systems and Robotics (ISR), April 2009
2008
On singular values of partially prescribed matrices
P. Aguiar, M. Stosic and J. Xavier
Linear Algebra and Its Applications, vol. 429, no.8-9, pp. 2136-2145, October 2008
Further results on the capacity and error probability analysis of non-coherent MIMO systems in the low SNR regime
M. Beko, J. Xavier and V. Barroso
IEEE Transactions on Signal Processing, vol. 56, no.7, pp. 2915-2930, 2008
Spectrally optimal factorization of incomplete matrices
P. Aguiar, J. Xavier and M. Stosic
IEEE Computer Society Conference on Computer Vision and Pattern Recoginition - CVPR'08, Anchorage, Alaska, USA, June 2008
ANSIG: an analytic signature for permutation-invariant two-dimensional shape representation
J. Rodrigues, J. Xavier and P. Aguiar
IEEE Computer Society Conference on Computer Vision and Pattern Recoginition - CVPR'08, Anchorage, Alaska, USA, June 2008
Low SNR analysis of the non-coherent MIMO channel under arbitrary channel and noise correlation structures
M. Beko, J. Xavier and V. Barroso
IEEE International Workshop on Signal Processing Advances for Wireless Communications - SPAWC'08, Recife, Brazil, July 2008
Classification of unlabeled point sets using ANSIG
J. Rodrigues, J. Xavier and P. Aguiar
IEEE International Conference on Image Processing - ICIP'08, San Diego, California, USA, October 2008
Globally optimal solution to exploit rigidity when recovering structure from motion under occlusion
P. Aguiar, J. Xavier and M. Stosic
IEEE International Conference on Image Processing - ICIP'08, San Diego, California, USA, October 2008
DoCoMo USA Labs Innovative Paper Award
LASIC: a model invariant framework for correspondence
B. Pires, J. M. F. Moura and J. Xavier
IEEE International Conference on Image Processing - ICIP'08, San Diego, California, USA, October 2008
Detection of statistical periodicities in DNA by conflict and entropy minimization methods
N. Monteiro, J. Gomes and J. Xavier
16th European Signal Processing Conference - EUSIPCO'08, Lausanne, Switzerland, August 2008
Convex ultrasound image reconstruction with log-Euclidean priors
J. Seabra, J. Xavier and J. Sanches
30th conference of the IEEE Engineering in Medicine and Biology Society - EMBS'08, Vancouver, Canada, August 2008
Fluorescence confocal microscopy imaging denoising with photobleaching
I. Rodrigues, J. Xavier and J. Sanches
30th conference of the IEEE Engineering in Medicine and Biology Society - EMBS'08, Vancouver, Canada, August 2008
Newton algorithms for Riemannian distance related problems on connected locally symmetric manifolds
R. Ferreira, J. Xavier, J. Costeira and V. Barroso
Technical report, Signal and Image Processing Group (SPIG), Institute for Systems and Robotics (ISR), November 2008
2007
Non-coherent communication in multiple-antenna systems: receiver design and codebook construction
M. Beko, J. Xavier and V. Barroso
IEEE Transactions on Signal Processing, vol. 55, no. 12, pp. 5703-5715, December 2007
Multi-view correspondence by enforcement of rigidity constraints
R. Oliveira, J. Xavier and J. Costeira
Image and Vision Computing, vol. 25, no. 6, pp. 1008-1020, 2007
Capacity and error probability analysis of non-coherent MIMO systems in the low SNR regime
M. Beko, J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'07, Honolulu, Hawai, USA, April 2007
2006
On the generalization of AR processes to Riemannian manifolds
J. Xavier and J. Manton
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'06, Toulouse, France, May 2006
Codebook design for non-coherent communication in multiple-antenna systems
M. Beko, J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'06, Toulouse, France, May 2006
Newton method for Riemannian centroid computation in naturally reductive homogeneous spaces
R. Ferreira, J. Xavier, J. P. Costeira and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'06, Toulouse, France, May 2006
Maximum likelihood attitude and position estimation from pseudo-range measurements using geometric descent optimization
A. Alcocer, P. Oliveira, A. Pascoal and J. Xavier
IEEE Conference on Decision and Control - CDC'06, San Diego, CA, USA, December 2006
Codebook design for the non-coherent GLRT receiver and low SNR MIMO block fading channel
M. Beko, J. Xavier and V. Barroso
IEEE International Workshop on Signal Processing Advances for Wireless Communications - SPAWC'06, Cannes, France, July 2006
Estimation of attitude and position from range only measurements using geometric descent optimization on the special Euclidean group
A. Alcocer, P. Oliveira, A. Pascoal and J. Xavier
9th International Conference on Information Fusion - FUSION'06, Florence, Italy, July 2006
Hessian of the Riemannian squared-distance function on connected locally symmetric spaces with applications
R. Ferreira and J. Xavier
7th Portuguese Conference on Automatic Control, special session on Control, Optimization and Computation, CONTROLO'06, Lisbon, Portugal, September 2006
2005
Intrinsic variance lower bound (IVLB): an extension of the Cramer-Rao bound to Riemannian manifolds
J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'05, Philadelphia, USA, May 2005
Optimal point correspondence through the use of rank constraints
R. Oliveira, J. Costeira and J. Xavier
IEEE Computer Society Conference on Computer Vision and Pattern Recoginition - CVPR'05, San Diego, USA, June 2005
Contour point tracking by enforcement of rigidity constraints
R. Oliveira, J. Costeira and J. Xavier
IEEE International Conference on 3D Digital Imaging and Modeling - 3DIM'05, Ottawa, Canada, June 2005
2004
The Riemannian geometry of certain parameter estimation problems with singular Fisher information matrices
J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'04, Montreal, Canada, May 2004
New Statistical bound for inference problems on Riemannian manifolds
J. Xavier and V. Barroso
IEEE International Workshop on Signal Processing Advances for Wireless Communications - SPAWC'04, Lisbon, Portugal, July 2004
Special plenary session on Differential Geometric Methods in Signal Processing, sponsored by the US NSF
Geodesic lower bound for parametric estimation with constraints
J. Xavier and V. Barroso
IEEE International Workshop on Signal Processing Advances for Wireless Communications - SPAWC'04, Lisbon, Portugal, July 2004
2003
Exploiting 2nd order statistics in Bayesian signal reconstruction problems
P. Lopes, J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'03, Hong-Kong, April 2003
Blind symbol detection and channel acquisition in fast-fading wireless systems with space diversity
T. Patrao, J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'03, Hong-Kong, April 2003
An interior point algorithm for joint symbol detection and multichannel acquisition in fast-fading narrowband channels
J. Xavier and V. Barroso
IEEE International Workshop on Signal Processing Advances for Wireless Communications - SPAWC'03, Rome, Italy, June 2003
2002
Blind Identification of MIMO Channels Based on 2nd Order Statistics and Colored Inputs: The Riemannian Geometry of Algorithms, Performance Analysis and Bounds over the Quotient Manifold of Identifiable Channel Classes
J. Xavier
PhD Thesis, Instituto Superior Técnico, Lisbon, Portugal, December 2002
Intrinsic distance lower bound for unbiased estimators on Riemannian manifolds
J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'02, Orlando, USA, May 2002
Prewhitening of mixing matrices: impact on the contraction of their probability mass priors
J. Xavier, V. Barroso, P. Lopes and T. Patrao
IEEE International Symposium on Information Theory - ISIT'02, Lausanne, Switzerland, 2002
Blind source separation and channel identification: exploiting 2nd-order statistics in Bayesian frameworks
J. Xavier, V. Barroso and P. Lopes
International Telecommunications Symposium - ITS'02, Natal, Brazil, September 2002
Joint symbol detection and multi-channel acquisition in fast-fading narrowband wireless environments
J. Xavier, V. Barroso and T. Patrao
International Telecommunications Symposium - ITS'02, Natal, Brazil, September 2002
2001
Closed-form correlative coding (CFC2) blind identification of MIMO Channels: isometry fitting to second order statistics
J. Xavier, V. Barroso and J. M. F. Moura
IEEE Transactions on Signal Processing, vol. 49, no. 5, pp. 1073-1086, 2001
Blind Channel Identification and Source Separation in SDMA Systems
V. Barroso, J. Xavier and J. M. F. Moura
Book chapter, Spatial Diversity and Source Estimation, in Antennas Wireless Communications Handbook, Ed. Lal C. Godara, CRC Press, 2001
Performance analysis of a second order statistics based solution for the MIMO channel identification problem
J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'01, Salt Lake City, USA, May 2001
Second-order blind MIMO channel identification based on correlative coding: asymptotic performance analysis
J. Xavier and V. Barroso
IEEE International Symposium on Information Theory - ISIT'01, Washington, USA, 2001
Blind identification of MIMO channels based on correlative coding: performance analysis
J. Xavier and V. Barroso
IEEE International Workshop on Signal Processing Advances for Wireless Communications - SPAWC'01, Taiwan, March 2001
2000
A semi-blind maximum likelihood approach for resolving linear convolutive mixtures
J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'00, Istambul, Turkey, June 2000
Blind identification on MIMO systems based on source correlative filtering
J. Xavier and V. Barroso
IEEE International Symposium on Information Theory - ISIT'00, Sorrento, Italy, July 2000
Semi-blind maximum likelihood separation of linear convolutive mixtures
J. Xavier and V. Barroso
IEEE Workshop on Statistical Signal and Array Processing - SSAP'00, Pennsylvania, USA, August 2000
1999
A channel order independent method for blind equalization of MIMO systems
J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'99, Phoenix, USA, March 1999
Correlative coding approach for blind identification of MIMO Systems
J. Xavier and V. Barroso
IEEE International Workshop on Signal Processing Advances for Wireless Communications - SPAWC'99, Annapolis, USA, May 1999
Blind identification of MIMO channels: a closed form solution based on second-order statistics
V. Barroso and J. Xavier
Asilomar Conference on Signals, Systems and Computers, California, USA, October 1999
Polyhedral concepts for deterministic blind separation of binary sources
J. Xavier and V. Barroso
Asilomar Conference on Signals, Systems and Computers, California, USA, October 1999
Joint symbol detection and multi-channel acquisition in fast-fading narrowband wireless environments
J. Xavier and V. Barroso
IEEE Global Telecommunications Conference - GLOBECOM'99, Rio de Janeiro, Brazil, December 1999
1998
Blind array channel division multiple access (AChDMA) for mobile communications
V. Barroso, J. M. F. Moura and J. Xavier
IEEE Transactions on Signal Processing, vol. 46, no. 3, pp. 737-752, 1998
Closed-form blind channel identification and source separation in SDMA systems through correlative coding
J. Xavier, V. Barroso and J. M. F. Moura
IEEE Journal on Selected Areas in Communications, vol. 16, no. 8, pp. 1506-1517, 1998
Blind source separation, ISI Cancellation and carrier phase recovey in SDMA Systems for mobile communications
J. Xavier and V. Barroso
Wireless Personal Communications, special issue on Wireless Broadband Communications, vol. 10, pp. 53-76, Kluwer Academic Publishers, 1998
Closed-form blind identification of MIMO systems
J. Xavier, V. Barroso and J. M. F. Moura
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'98, Seattle, USA, May 1998
Low complexity blind minimum variance zero forcing equalization of MIMO systems
J. Xavier and V. Barroso
IEEE International Symposium on Information Theory - ISIT'98, Boston, USA, August 1998
1997
Blind SDMA with a signal space geometry matched algorithm
J. Xavier and V. Barroso
IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP'97, Germany, April 1997