Post-doctoral research fellow at the Digital Signal Processing and Image Analysis Group, University of Oslo.

Visiting address:
Ole-Johan Dahls Hus (Informatics building), 4th floor.

Journal Publications:
1) C.-I. C. Nilsen and S. Holm, "Distortion-free delta-sigma beamforming", IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2008
2) C.-I. C. Nilsen and I. Hafizovic, "Beamspace adaptive beamforming for ultrasound imaging", IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2009
3) C.-I.C. Nilsen and S. Holm, "Wiener beamforming and the coherence factor in ultrasound imaging", IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2010
4) I. Hafizovic, C.-I. C. Nilsen, M. Kjølerbakken, and V. Jahr, "Design and Implementation of a MEMS Microphone Array System for Real-Time Speech Acquisition", Applied Acoustics 2012
5) I. Hafizovic, C.-I. C. Nilsen, and S. Holm, "Transformation Between Uniform Linear and Spherical Microphone Arrays with Symmetric Responses", IEEE Transactions on Acoustics, Speech, and Language Processing 2012
6) A.E.A. Blomberg, C.-I.C. Nilsen, A. Austeng, and R.E. Hansen, "Adaptive Sonar Imaging Using Aperture Coherence", IEEE Journal of Oceanic Engineering 2012
7) A.C. Jensen, S.P.Näsholm, C.-I.C. Nilsen, A. Austeng, and S. Holm, "Applying Thomson's Multitaper Approach to Reduce Speckle in Medical Ultrasound Imaging", IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2012
8) J. P. Åsen, J.I. Buskenes, C.-I.C. Nilsen, A. Austeng, and S. Holm, "Implementing Capon Beamforming on a GPU for Real-Time Cardiac Ultrasound Imaging", IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014
9) J.I. Buskenes, J.P. Åsen, C.-I.C. Nilsen, A. Austeng, and S. Holm, "An Optimized GPU Implementation of the MVDR Beamformer for Active Sonar Imaging", IEEE Journal of Oceanic Engineering 2014

Conference publications:
1) C. I. C. Nilsen and S. Holm: "A Generic Acoustic Beamformer for Ultrasound, Sonar, and Microphone Arrays", Norwegian Symposium on Signal Processing, 2005
2) C.-I. C. Nilsen and S. Holm, "Distortion-free delta-sigma beamforming with dynamic delays", IEEE Ultrasonics Symposium 2006
3) J.-F. Synnevåg, C.-I. C. Nilsen, and S. Holm, "Speckle Statistics in Adaptive Beamforming", IEEE Ultrasonics Symposium 2007
4) C.-I. C. Nilsen, "Delta-Sigma Beamforming with Parallel Modulation", IEEE Ultrasonics Symposium 2007
5) C.-I. C. Nilsen and I. Hafizovic, "Digital beamforming using a GPU", ICASSP 2009
6) I. Hafizovic, C.-I. C. Nilsen, and M. Kjølerbakken, "Tracking of aircraft using a circular microphone array sensor", IEEE Phased Array Symposium 2010
7) S. Holm and C.-I. C. Nilsen, "Robust ultrasonic indoor positioning using transmitter arrays", IPIN 2010
8) I. Hafizovic and C.-I. C. Nilsen, "Speech Enhancement Based on a Simplified Generalized Sidelobe Canceller Structure", IWSSIP 2011
9) J. I. Buskenes, A. Austeng, and C.-I. C. Nilsen, "A Low-Complexity Adaptive Beamformer for Active Sonar Imaging", UAM 2011
10) I. Hafizovic, C.-I. C. Nilsen, and S. Holm, "Decorrelation for Adaptive Beamforming Applied to Arbitrarily Sampled Spherical Arrays", WASPAA 2011
11) A. Austeng, C.-I. C. Nilsen, A. C. Jensen, S. P. Näsholm, and S. Holm, "Coherent Plane-Wave Compounding and Minimum Variance Beamforming", IEEE Ultrasonics Symposium 2011
12) A. C. Jensen, C.-I. C. Nilsen, A. Austeng, S. P. Näsholm,, and S. Holm, "A Multitaper Approach to Speckle Reduction for Medical Ultrasound Imaging", IEEE Ultrasonics Symposium 2011
13) S. P. Näsholm, A. Austeng, A. C. Jensen, C.-I. C. Nilsen, and S. Holm, "Capon Beamforming Applied to Second-Harmonic Ultrasound Experimental Data", IEEE Ultrasonics Symposium 2011
14) A. Austeng, A. C. Jensen, C.-I. C. Nilsen, H. J. Callow, and R. E. Hansen, "Use of the Minimum Variance Beamformer in SAS Imaging", Proceedings of the 11th ECUA, 2012
15) A. E. A. Blomberg, C.-I. C. Nilsen, R. E. Hansen, and A. Austeng, "Detecting and Localizing Gas Seeps at the Seafloor Using an Interferometric Sidescan Sonar", Proceedings of the 11th ECUA, 2012
16) K. Landmark, A.H.S. Solberg, C.-I. C. Nilsen, A. Austeng, and R. E. Hansen, "Bayesian Seabed Classification Using Angle-Dependent Backscatter Data From Multibeam Sonar", Proceedings of the 11th ECUA, 2012
17) J. I. Buskenes, J. P. Åsen, C.-I. C. Nilsen, A. Austeng, "A GPU Implementation of Capon for an Active Ultrasound System", 11th ECUA, 2012
18) J. P. Åsen, J.I. Buskenes, C.-I.C Nilsen, A. Austeng, and S. Holm, "Implementing Capon Adaptive Beamforming on the GPU for Real Time Cardiac Ultrasound Imaging", IEEE Ultrasonics Symposium 2012
19) C.-I.C. Nilsen, I. Hafizovic, and S. Holm, "Robust 3D Sound Source Localization Using Spherical Microphone Arrays", AES 134th Convention, 2013
20) J.I. Buskenes, J.P. Åsen, C.-I.C. Nilsen, and A. Austeng, "Adapting the minimum variance beamformer to a graphics processing unit for active sonar imaging systems", Proceedings of Meetings on Acoustics, 2013