Visa Koivunen

Sachin Chaudhari, Jarmo Lundén, Visa Koivunen, H. Vincent Poor: BEP walls for cooperative sensing in cognitive radios using K-out-of-N fusion rules. Signal Processing 93(7): 1900-1908 (2013)

Jan Oksanen, Jarmo Lundén, Visa Koivunen: Reinforcement learning based sensing policy optimization for energy efficient cognitive radio networks. Neurocomputing 80: 102-110 (2012)

Pekka Jänis, Cássio B. Ribeiro, Visa Koivunen: Flexible UL-DL Switching Point in TDD Cellular Local Area Wireless Networks. MONET 17(5): 695-707 (2012)

Esa Ollila, David E. Tyler, Visa Koivunen, H. Vincent Poor: Compound-Gaussian Clutter Modeling With an Inverse Gaussian Texture Distribution. IEEE Signal Process. Lett. 19(12): 876-879 (2012)

Abdelhak M. Zoubir, Visa Koivunen, Yacine Chakhchoukh, Michael Muma: Robust Estimation in Signal Processing: A Tutorial-Style Treatment of Fundamental Concepts. IEEE Signal Process. Mag. 29(4): 61-80 (2012)

Sachin Chaudhari, Jarmo Lundén, Visa Koivunen, H. Vincent Poor: Cooperative Sensing With Imperfect Reporting Channels: Hard Decisions or Soft Decisions? IEEE Transactions on Signal Processing 60(1): 18-28 (2012)

Mário Costa, Andreas Richter, Visa Koivunen: DoA and Polarization Estimation for Arbitrary Array Configurations. IEEE Transactions on Signal Processing 60(5): 2330-2343 (2012)

Dzevdan Kapetanovic, Fredrik Rusek, Traian E. Abrudan, Visa Koivunen: Construction of Minimum Euclidean Distance MIMO Precoders and Their Lattice Classifications. IEEE Transactions on Signal Processing 60(8): 4470-4474 (2012)

Esa Ollila, David E. Tyler, Visa Koivunen, H. Vincent Poor: Complex Elliptically Symmetric Distributions: Survey, New Results and Applications. IEEE Transactions on Signal Processing 60(11): 5597-5625 (2012)

Alexandra Oborina, Martti Moisio, Visa Koivunen: Performance of Mobile MIMO OFDM Systems With Application to UTRAN LTE Downlink. IEEE Transactions on Wireless Communications 11(8): 2696-2706 (2012)

Tommi Koivisto, Visa Koivunen: Diversity Transmission of Synchronization Sequences in MIMO Systems. IEEE Transactions on Wireless Communications 11(11): 4048-4057 (2012)

Sachin Chaudhari, Jarmo Lundén, Visa Koivunen: Effects of quantization and channel errors on sequential detection in cognitive radios. CISS 2012: 1-6

Jarmo Lundén, Visa Koivunen: Locally optimum and suboptimum detection of complex-valued cyclostationary signals. CISS 2012: 1-5

Alexandra Oborina, Tero Henttonen, Visa Koivunen, Martti Moisio: Efficient computation of effective SINR. CISS 2012: 1-6

Jan Oksanen, Jarmo Lundén, Visa Koivunen: Design of spectrum sensing policy for multi-user multi-band cognitive radio network. CISS 2012: 1-6

Jan Oksanen, Jarmo Lundén, Visa Koivunen: Resource minimization driven spectrum sensing policy. ICASSP 2012: 3657-3660

Tuomas Aittomäki, Visa Koivunen: TArget velocity estimation with distributed MIMO radar using multiple pulse repetition frequencies. ICASSP 2012: 5201-5204

Sachin Chaudhari, Jarmo Lundén, Visa Koivunen: BEP walls for cooperative Bayesian detection with reporting channel errors. PIMRC 2012: 2166-2172

Jan Oksanen, Jarmo Lundén, Visa Koivunen: Design of Spectrum Sensing Policy for Multi-user Multi-band Cognitive Radio Network. CoRR abs/1209.1739 (2012)

Jan Oksanen, Visa Koivunen, H. Vincent Poor: A Sensing Policy Based on Confidence Bounds and a Restless Multi-Armed Bandit Model. CoRR abs/1211.4384 (2012)

Pekka Jänis, Visa Koivunen, Cássio B. Ribeiro: Interference-Aware Radio Resource Management for Local Area Wireless Networks. EURASIP J. Wireless Comm. and Networking 2011 (2011)

Man-On Pun, Visa Koivunen, H. Vincent Poor: Performance Analysis of Joint Opportunistic Scheduling and Receiver Design for MIMO-SDMA Downlink Systems. IEEE Transactions on Communications 59(1): 268-280 (2011)

Esa Ollila, Jan Eriksson, Visa Koivunen: Complex Elliptically Symmetric Random Variables - Generation, Characterization, and Circularity Tests. IEEE Transactions on Signal Processing 59(1): 58-69 (2011)

Pekka Jänis, Visa Koivunen, Cássio B. Ribeiro: On the performance of flexible UL-DL switching point in TDD wireless networks. GLOBECOM Workshops 2011: 225-230

Tuomas Aittomäki, Visa Koivunen: Widely distributed MIMO radar beamforming for detecting targets with slow RCS fluctuations. ICASSP 2011: 2792-2795

Sachin Chaudhari, Jarmo Lundén, Visa Koivunen: BEP walls for collaborative spectrum sensing. ICASSP 2011: 2984-2987

Esa Ollila, Visa Koivunen, H. Vincent Poor: A robust estimator and detector of circularity of complex signals. ICASSP 2011: 3620-3623

Esa Ollila, Visa Koivunen, H. Vincent Poor: Complex-valued signal processing - essential models, tools and statistics. ITA 2011: 296-305

Sachin Chaudhari, Jarmo Lundén, Visa Koivunen: Performance limitations for cooperative spectrum sensing with reporting channel errors. PIMRC 2011: 337-342

Jayaprakash Rajasekharan, Jan Eriksson, Visa Koivunen: Cooperative game theory and auctioning for spectrum allocation in cognitive radios. PIMRC 2011: 656-660

Keijo Pölönen, Visa Koivunen: Reduced complexity space-time coding in single-frequency networks. WCNC 2011: 1523-1528

Jan Oksanen, Jarmo Lundén, Visa Koivunen: Reinforcement learning based sensing policy optimization for energy efficient cognitive radio networks. CoRR abs/1106.1770 (2011)

Jayaprakash Rajasekharan, Jan Eriksson, Visa Koivunen: Cooperative Game-Theoretic Approach to Spectrum Sharing in Cognitive Radios. CoRR abs/1112.1520 (2011)

Xin Liu, Athina P. Petropulu, H. Vincent Poor, Visa Koivunen: Blind Separation of Two Users Based on User Delays and Optimal Pulse-Shape Design. EURASIP J. Wireless Comm. and Networking 2010 (2010)

Tuomas Aittomäki, Visa Koivunen: Performance of MIMO Radar With Angular Diversity Under Swerling Scattering Models. J. Sel. Topics Signal Processing 4(1): 101-114 (2010)

Jarmo Lundén, Saleem A. Kassam, Visa Koivunen: Robust nonparametric cyclic correlation-based spectrum sensing for cognitive radio. IEEE Transactions on Signal Processing 58(1): 38-52 (2010)

Mário Costa, Andreas Richter, Visa Koivunen: Unified array manifold decomposition based on spherical harmonics and 2-D Fourier basis. IEEE Transactions on Signal Processing 58(9): 4634-4645 (2010)

Jan Eriksson, Esa Ollila, Visa Koivunen: Essential statistics and tools for complex random variables. IEEE Transactions on Signal Processing 58(10): 5400-5408 (2010)

Jan Oksanen, Visa Koivunen, Jarmo Lundén, Anu Huttunen: Diversity-based spectrum sensing policy for detecting primary signals over multiple frequency bands. ICASSP 2010: 3130-3133

Alexandra Oborina, Martti Moisio, Visa Koivunen: Ergodic system capacity of mobile MIMO systems using adaptive modulation. PIMRC 2010: 2375-2380

Pekka Jänis, Chia-Hao Yu, Klaus Doppler, Cássio B. Ribeiro, Carl Wijting, Klaus Hugl, Olav Tirkkonen, Visa Koivunen: Device-to-Device Communication Underlaying Cellular Communications Systems. IJCNS 2(3): 169-178 (2009)

Esa Ollila, Visa Koivunen: Complex ICA using generalized uncorrelating transform. Signal Processing 89(4): 365-377 (2009)

Traian E. Abrudan, Jan Eriksson, Visa Koivunen: Conjugate gradient algorithm for optimization under unitary matrix constraint. Signal Processing 89(9): 1704-1714 (2009)

Esa Ollila, Visa Koivunen: Influence Function and Asymptotic Efficiency of Scatter Matrix Based Array Processors: Case MVDR Beamformer. IEEE Transactions on Signal Processing 57(1): 247-259 (2009)

Jussi Salmi, Andreas Richter, Visa Koivunen: Detection and Tracking of MIMO Propagation Path Parameters Using State-Space Approach. IEEE Transactions on Signal Processing 57(4): 1538-1550 (2009)

Sachin Chaudhari, Visa Koivunen, H. Vincent Poor: Autocorrelation-based decentralized sequential detection of OFDM signals in cognitive radios. IEEE Transactions on Signal Processing 57(7): 2690-2700 (2009)

Jarmo Lundén, Visa Koivunen, Anu Huttunen, H. Vincent Poor: Collaborative cyclostationary spectrum sensing for cognitive radio systems. IEEE Transactions on Signal Processing 57(11): 4182-4195 (2009)

Jussi Salmi, Andreas Richter, Visa Koivunen: Sequential unfolding SVD for tensors with applications in array signal processing. IEEE Transactions on Signal Processing 57(12): 4719-4733 (2009)

Mário Costa, Visa Koivunen, Andreas Richter: Low complexity azimuth and elevation estimation for arbitrary array configurations. ICASSP 2009: 2185-2188

Stefan Werner, Yih-Fang Huang, Marcello L. R. de Campos, Visa Koivunen: Distributed parameter estimation with selective cooperation. ICASSP 2009: 2849-2852

Jan Eriksson, Esa Ollila, Visa Koivunen: Statistics for complex random variables revisited. ICASSP 2009: 3565-3568

Pekka Jänis, Visa Koivunen, Markus Nentwig: Optimizing spectral shape under general spectrum emission mask constraints. PIMRC 2009: 107-111

Pekka Jänis, Visa Koivunen, Cássio B. Ribeiro, Klaus Doppler, Klaus Hugl: Interference-avoiding MIMO schemes for device-to-device radio underlaying cellular networks. PIMRC 2009: 2385-2389

Tommi Koivisto, Visa Koivunen: Impact of time and frequency offsets on cooperative multi-user MIMO-OFDM systems. PIMRC 2009: 3119-3123

Pekka Jänis, Visa Koivunen, Cássio B. Ribeiro, Juha Korhonen, Klaus Doppler, Klaus Hugl: Interference-Aware Resource Allocation for Device-to- Device Radio Underlaying Cellular Networks. VTC Spring 2009

Pekka Jänis, Visa Koivunen, Olav Tirkkonen, Klaus Hugl: Adjacent Channel Interference Between Asynchronous TDD Cellular Networks. VTC Spring 2009

Tommi Koivisto, Visa Koivunen: Diversity Transmission for Correlation-Based Slot Synchronization with Noncoherent Combining. VTC Spring 2009

Esa Ollila, Hannu Oja, Visa Koivunen: Complex-valued ICA based on a pair of generalized covariance matrices. Computational Statistics & Data Analysis 52(7): 3789-3805 (2008)

Traian E. Abrudan, Jan Eriksson, Visa Koivunen: Steepest Descent Algorithms for Optimization Under Unitary Matrix Constraint. IEEE Transactions on Signal Processing 56(3): 1134-1147 (2008)

Esa Ollila, Hyon-Jung Kim, Visa Koivunen: Compact Cramér-Rao Bound Expression for Independent Component Analysis. IEEE Transactions on Signal Processing 56(4): 1421-1428 (2008)

Sachin Chaudhari, Jarmo Lundén, Visa Koivunen: Collaborative autocorrelation-based spectrum Sensing of OFDM signals in cognitive radios. CISS 2008: 191-196

Alexandra Oborina, Martti Moisio, Tero Henttonen, Esa Pernila, Visa Koivunen: MIMO performance evaluation in UTRAN Long Term Evolution downlink. CISS 2008: 1179-1183

Andreas Richter, Jussi Salmi, Visa Koivunen: ML estimation of covariance matrix for tensor valued signals in noise. ICASSP 2008: 2349-2352

Traian E. Abrudan, Jan Eriksson, Visa Koivunen: Efficient Riemannian algorithms for optimization under unitary matrix constraint. ICASSP 2008: 2353-2356

Stefan Werner, Mobien Mohammed, Yih-Fang Huang, Visa Koivunen: Decentralized set-membership adaptive estimation for clustered sensor networks. ICASSP 2008: 3573-3576

Man-On Pun, Visa Koivunen, H. Vincent Poor: SINR Analysis of Opportunistic MIMO-SDMA Downlink Systems with Linear Combining. ICC 2008: 3720-3724

Vahid Tarokh, Siavash M. Alamouti, Visa Koivunen, KiHo Kim: MIMO-OFDM and its application. Journal of Communications and Networks 9(2): 109-111 (2007)

Mihai Enescu, Timo Roman, Visa Koivunen: State-space approach to spatially correlated MIMO OFDM channel estimation. Signal Processing 87(9): 2272-2279 (2007)

Tommi Koivisto, Visa Koivunen: Blind despreading of short-code DS-CDMA signals in asynchronous multi-user systems. Signal Processing 87(11): 2560-2568 (2007)

Cássio B. Ribeiro, Esa Ollila, Visa Koivunen: Stochastic Maximum-Likelihood Method for MIMO Propagation Parameter Estimation. IEEE Transactions on Signal Processing 55(1): 46-55 (2007)

Cássio B. Ribeiro, Andreas Richter, Visa Koivunen: Joint Angular- and Delay-Domain MIMO Propagation Parameter Estimation Using Approximate ML Method. IEEE Transactions on Signal Processing 55(10): 4775-4790 (2007)

Fabio Belloni, Andreas Richter, Visa Koivunen: DoA Estimation Via Manifold Separation for Arbitrary Array Structures. IEEE Transactions on Signal Processing 55(10): 4800-4810 (2007)

Traian E. Abrudan, Visa Koivunen: Blind equalization in spatial multiplexing MIMO-OFDM systems based on vector CMA and decorrelation criteria. Wireless Personal Communications 43(4): 1151-1172 (2007)

Timo Roman, Visa Koivunen: Carrier frequency synchronization for mobile television receivers. ISCAS 2007: 261-264

Man-On Pun, Visa Koivunen, H. Vincent Poor: Opportunistic Scheduling and Beamforming for MIMO-SDMA Downlink Systems with Linear Combining. CoRR abs/0706.3846 (2007)

Yuanning Yu, Athina P. Petropulu, H. Vincent Poor, Visa Koivunen: Blind Estimation of Multiple Carrier Frequency Offsets. CoRR abs/0707.0463 (2007)

Jarmo Lundén, Visa Koivunen, Anu Huttunen, H. Vincent Poor: Spectrum Sensing in Cognitive Radios Based on Multiple Cyclic Frequencies. CoRR abs/0707.0909 (2007)

Jan Eriksson, Visa Koivunen: Complex random vectors and ICA models: identifiability, uniqueness, and separability. IEEE Transactions on Information Theory 52(3): 1017-1029 (2006)

Fabio Belloni, Visa Koivunen: Beamspace Transform for UCA: Error Analysis and Bias Reduction. IEEE Transactions on Signal Processing 54(8): 3078-3089 (2006)

Timo Roman, Samuli Visuri, Visa Koivunen: Blind Frequency Synchronization in OFDM via Diagonality Criterion. IEEE Transactions on Signal Processing 54(8): 3125-3135 (2006)

Scott C. Douglas, Jan Eriksson, Visa Koivunen: Equivariant Algorithms for Estimating the Strong-Uncorrelating Transform in Complex Independent Component Analysis. ICA 2006: 57-65

Scott C. Douglas, Jan Eriksson, Visa Koivunen: Fixed-Point Complex ICA Algorithms for the Blind Separation of Sources Using Their Real or Imaginary Components. ICA 2006: 343-351

Jari Salo, Jan Eriksson, Visa Koivunen, Pertti Vainikainen: Empirical Characteristic Function Based Estimation of Multiple Scattering Channel Parameters. PIMRC 2006: 1-5

Maarit Melvasalo, Pekka Jänis, Visa Koivunen: MMSE equalizer and chip level inter-antenna interference canceler for HSDPA MIMO systems. VTC Spring 2006: 2008-2012

Jussi Salmi, Andreas Richter, Mihai Enescu, Pertti Vainikainen, Visa Koivunen: Propagation Parameter Tracking using Variable State Dimension Kalman Filter. VTC Spring 2006: 2757-2761

Mikko Valkama, Markku Renfors, Visa Koivunen: Blind I/Q Signal Separation-Based Solutions for Receiver Signal Processing. EURASIP J. Adv. Sig. Proc. 2005(16): 2708-2718 (2005)

Mihai Enescu, Marius Sirbu, Visa Koivunen: Adaptive equalization of time-varying MIMO channels. Signal Processing 85(1): 81-93 (2005)

Mikko Valkama, Markku Renfors, Visa Koivunen: Blind I/Q imbalance compensation in OFDM receivers based on adaptive I/Q signal decorrelation. ISCAS (3) 2005: 2611-2614

Jan Eriksson, Visa Koivunen: Blind separation of a class of nonlinear ICA models. ISCAS (6) 2005: 5890-5893

Visa Koivunen, Mihai Enescu: Estimating the fading coefficient in mobile OFDM systems using state-space model. ISCAS (6) 2005: 6094-6097

Jan Eriksson, Visa Koivunen: Complex Random Vectors and ICA Models: Identifiability, Uniqueness and Separability. CoRR abs/cs/0512063 (2005)

Maarit Melvasalo, Visa Koivunen: Blind Channel Estimation in Multicode CDMA Using Multiantenna Receiver. Wireless Personal Communications 28(3): 163-178 (2004)

Timo Roman, Mihai Enescu, Visa Koivunen: Joint Time-Domain Tracking of Channel and Frequency Offsets for MIMO OFDM Systems. Wireless Personal Communications 31(3-4): 181-200 (2004)

Cássio B. Ribeiro, Esa Ollila, Visa Koivunen: Stochastic maximum likelihood method for propagation parameter estimation. PIMRC 2004: 1839-1843

Jan Eriksson, Visa Koivunen: Characteristic-function-based independent component analysis. Signal Processing 83(10): 2195-2208 (2003)

Marius Sirbu, Visa Koivunen: Multichannel Estimation and Equalization Algorithm for Asynchronous Uplink DS/CDMA. Wireless Personal Communications 26(1): 33-52 (2003)

Timo Roman, Mihai Enescu, Visa Koivunen: Time-domain method for tracking dispersive channels in MIMO OFDM systems. ICME 2003: 609-612

Juha Karvanen, Visa Koivunen: Blind separation methods based on Pearson system and its extensions. Signal Processing 82(4): 663-673 (2002)

Juha Karvanen, Jan Eriksson, Visa Koivunen: Adaptive Score Functions for Maximum Likelihood ICA. VLSI Signal Processing 32(1-2): 83-92 (2002)

Mihai Enescu, Visa Koivunen: Time-varying channel tracking for space-time block coding. VTC Spring 2002: 294-297

Visa Koivunen, Mihai Enescu, Erkki Oja: Adaptive Algorithm for Blind Separation from Noisy Time-Varying Mixtures. Neural Computation 13(10): 2339-2357 (2001)

Jukka Mannerkoski, Visa Koivunen, Desmond P. Taylor: Performance bounds for multistep prediction-based blind equalization. IEEE Transactions on Communications 49(1): 84-93 (2001)

Samuli Visuri, Hannu Oja, Visa Koivunen: Subspace-based direction-of-arrival estimation using nonparametric statistics. IEEE Transactions on Signal Processing 49(9): 2060-2073 (2001)

Mikko Valkama, Markku Renfors, Visa Koivunen: Advanced methods for I/Q imbalance compensation in communication receivers. IEEE Transactions on Signal Processing 49(10): 2335-2344 (2001)

Jukka Mannerkoski, Visa Koivunen: Autocorrelation properties of channel encoded sequences-applicability to blind equalization. IEEE Transactions on Signal Processing 48(12): 3501-3507 (2000)

Jukka Mannerkoski, Visa Koivunen: Error analysis of a multi-step prediction based blind equalizer. ISCAS (3) 1999: 86-89

Samuli Visuri, Hannu Oja, Visa Koivunen: Multichannel signal processing using spatial rank covariance matrices. NSIP 1999: 75-79

Visa Koivunen, Nageen Himayat, Saleem A. Kassam: Nonlinear filtering techniques for multivariate images - Design and robustness characterization. Signal Processing 57(1): 81-91 (1997)

Visa Koivunen, Jean-Marc Vézien: Machine Vision Tools for CAGD. IJPRAI 10(2): 165-182 (1996)

Visa Koivunen: Nonlinear filtering of multivariate images under robust error criterion. IEEE Transactions on Image Processing 5(6): 1054-1060 (1996)

Visa Koivunen, Pauli Kuosmanen, Jaakko Astola: Orthogonal spline fitting in range data. ICIP (2) 1996: 385-388

Visa Koivunen, Saleem A. Kassam: Covariance estimation in multivariate OS-filtering. ICIP (1) 1996: 981-984

Visa Koivunen: A robust nonlinear filter for image restoration. IEEE Transactions on Image Processing 4(5): 569-578 (1995)

Visa Koivunen, Nageen Himayat, Saleem A. Kassam: Multivariate MTM filters-analysis and design options. ICIP 1995: 354-357

Visa Koivunen: A Robust Approach to Enhancement of Multivariate Images. ICIP (2) 1994: 462-466

Visa Koivunen, Nageen Himayat, Saleem A. Kassam: Median and Robust Polynomial Filters for Multivariate Image Data. ICIP (2) 1994: 487-491

Visa Koivunen, Ruzena Bajcsy: Spline Representations in 3-D Vision. Object Representation in Computer Vision 1994: 177-190

Visa Koivunen, Jean-Marc Vézien, Ruzena Bajcsy: Procedural CAD Models from Range Data. Towards World Class Manufacturing 1993: 87-100