Torbjörn Ekman
About
Nils Torbjörn Ekman (1969) is a Professor at the Department of Electronics and Telecommunications. He is performing research, supervision and teaching within the fields of radio communications, communication theory and signal processing. He is currently responsible for the national infrastructure project Reconfigurable Radio Network Plattform (ReRaNP) for massive MIMO research. Professor Ekman has a MSc in Engineering Physics, as well as a Licentiate of Philosophy and Doctor of Philosophy degree both in Signal Processing from the University of Uppsala.
He has supervised 7 PhD students to completion and cosupervised several others. In addition Ekman supervises about 2 MSc students a year.
Fields of expertise
- Statistical channel modeling for dynamic wireless radio channels
- Prediction of radio channels for applications in adaptive modulation
- Sensor networks
- Subspace descriptions of MIMO channels
- High resolution spectral estimation
- Satelite radio interference
Work Experience
- 2022 Guest researcher at USC, Los Angeles, USA
- 2014- Professor at IET/NTNU
- 2011-2012 Guest researcher at NYU Poly, New York, USA
- 2005-2014 Associate Professor at IET/NTNU
- 2002-2005 Postdoc at Unik, Kjeller Norway
- 1999-2002 Located at the DSB group at University of Oslo (UiO)
- 1997-1998 Marie Curie scholarship at Institut für Nachrichtentechnik und Hochfrequenztechnik, Technisce Universität Wien, Austria
- 1995-2002 PhD student, Signals and Systems Group, Uppsala University, Sweden
Research project experience
- ReRaNP, NFR Infrastructure project 2015
- CAMOS, NTNU/IME project 2013
Project leader
Communications and Sensor Networks for Coastal and Arctic Maritime Operations and Surveillance - WILATI+, Nordite project, 2006
Primary investigator and manager of the Norwegian part
Cooperation with TKK, Finland, LTH, Sweden.
Wireless interference-limited high-throughput access technologies and applications - SENDORA, EU FP7 STREP project, 2008
Primary investigator and manager for the Norwegian part
Project on sensor network aided cognitive radio
WP leader for Cognitive Actuation. - MoPSAR, NFR funded project, 2004
Modeling and Prediction of mm Wavelength Channels, Scheduling and Adaptive Data Rate for Wireless Access Systems
Publications
2024
-
Ekman, Torbjörn.
(2024)
Fading Distribution Model for the Maritime Radio Channel.
IEEE (Institute of Electrical and Electronics Engineers)
Academic chapter/article/Conference paper
-
Li, Xin;
Ekman, Torbjörn;
Yang, Kun.
(2024)
Multi-Cluster Approaches to Radio Sensor Array Channel Modeling and Simulation.
Sensors
Academic article
2023
-
Quintana Diaz, Gara;
Ekman, Torbjörn;
Camanzo, Alejandro;
Birkeland, Roger;
Lago, José Miguel;
Muíño, Alberto González.
(2023)
Satellite uplink interference measurements in the 437 MHz UHF amateur radio band onboard LUME-1.
Acta Astronautica
Academic article
2022
-
Birkeland, Roger;
Quintana DÃaz, Gara;
Honoré-Livermore, Evelyn;
Ekman, Torbjörn;
Agelet, Fernando Aguado;
Johansen, Tor Arne.
(2022)
Development of a multi-purpose SDR payload for the
HYPSO-2 satellite.
IEEE Aerospace Conference. Proceedings
Academic article
-
Quintana DÃaz, Gara;
Birkeland, Roger;
Løge, Lars;
Andersen, Even;
Bolstad, Anton;
Ekman, Torbjörn.
(2022)
In-orbit Interference Measurements and Analysis in the
VDES-band with the NorSat-2 Satellite.
IEEE Aerospace Conference. Proceedings
Academic article
-
Abraham, Jens;
Ramírez-Espinosa, Pablo;
Ekman, Torbjörn.
(2022)
Statistics of the Effective Massive MIMO Channel in Correlated Rician Fading.
IEEE Open Journal of Antennas and Propagation
Academic article
2021
-
Quintana-Diaz, Gara;
Nodar-López, Diego;
González Muíño, Alberto;
Aguado Agelet, Fernando;
Cappelletti, Chantal;
Ekman, Torbjörn.
(2021)
Detection of radio interference in the UHF amateur radio band with the Serpens satellite.
Advances in Space Research
Academic article
-
Quintana Díaz, Gara;
Ekman, Torbjörn;
Lago Agra, José Miguel;
Hurtado de Mendoza, Diego;
González Muíño, Alberto;
Agelet, Fernando Aguado.
(2021)
In-orbit measurements and analysis of radio interference in the UHF amateur radio band from the LUME-1 satellite.
Remote Sensing
Academic article
2019
-
Yang, Kun;
Molisch, Andreas F.;
Ekman, Torbjörn;
Røste, Terje;
Berbineau, Marion.
(2019)
A Round Earth Loss Model and Small-Scale Channel Properties for Open-Sea Radio Propagation.
IEEE Transactions on Vehicular Technology
Academic article
-
Ghiaasi , Golsa;
Abraham, Jens;
Eide, Egil;
Ekman, Torbjörn.
(2019)
Effective Channel Hardening in an Indoor Multiband Scenario.
International Journal of Wireless Information Networks
Academic article
-
Yang, Kun;
Zhou, Ning;
Røste, Terje;
Yu, Junyi;
Li, Fang;
Chen, Wei.
(2019)
High-speed Vehicle-to-Vehicle Radio Channel Characteristics for Suburban and Municipal Lake Region at 5.9 GHz.
IEEE (Institute of Electrical and Electronics Engineers)
Academic chapter/article/Conference paper
2016
-
Salvo Rossi, Pierluigi;
Ciuonzo, Domenico;
Kansanen, Kimmo Juhani;
Ekman, Torbjörn.
(2016)
Performance Analysis of Energy Detection for MIMO Decision Fusion in Wireless Sensor Networks over Arbitrary Fading Channels.
IEEE Transactions on Wireless Communications
Academic article
-
Lundheim, Lars Magne;
Ekman, Torbjörn;
Gajic, Bojana;
Larsen, Bjørn B.;
Tybell, Per Thomas Martin.
(2016)
Early Innovation Projects: First Experiences from the Electronic Engineering Ladder at NTNU.
Academic chapter/article/Conference paper
-
Larsen, Bjørn B.;
Lundheim, Lars Magne;
Ekman, Torbjörn;
Tybell, Per Thomas Martin.
(2016)
Teaching Freshmen Engineering Communication.
IEEE conference proceedings
Academic chapter/article/Conference paper
2015
-
Ekman, Torbjörn.
(2015)
An fir predictor interpretation of LS estimation of sinusoidal amplitudes followed by extrapolation.
European Signal Processing Conference
Academic article
-
Askeland, Stein-Arne;
Ekman, Torbjörn.
(2015)
Tracking with a high-resolution 2-D spectral estimation based automotive radar.
IEEE Transactions on Intelligent Transportation Systems (T-ITS)
Academic article
-
Salvo Rossi, Pierluigi;
Ciuonzo, Domenico;
Kansanen, Kimmo;
Ekman, Torbjörn.
(2015)
On Energy Detection for MIMO Decision Fusion in Wireless Sensor Networks over NLOS Fading.
IEEE Communications Letters
Academic article
-
Salvo Rossi, Pierluigi;
Ciuonzo, Domenico;
Ekman, Torbjörn;
Dong, Hefeng.
(2015)
Energy Detection for MIMO Decision Fusion in Underwater Sensor Networks.
IEEE Sensors Journal
Academic article
-
Cella, Tommaso;
Ekman, Torbjörn.
(2015)
High Capacity and High Coverage mm-Wave Multi-Antenna Systems.
Doktoravhandlinger ved NTNU (2015/225)
Doctoral dissertation
-
Salvo Rossi, Pierluigi;
Ciuonzo, Domenico;
Ekman, Torbjörn.
(2015)
HMM-Based Decision Fusion in Wireless Sensor Networks with Noncoherent Multiple Access.
IEEE Communications Letters
Academic article
2014
-
Cella, Tommaso;
Orten, Pål;
Ekman, Torbjörn.
(2014)
Design of a practical and compact mm-wave MIMO system with optimized capacity and phased arrays.
International Journal of Antennas and Propagation
Academic article
-
Cella, Tommaso;
Orten, Pål;
Ekman, Torbjörn.
(2014)
MM-WAVE SHORT RANGE OUTDOOR LINKS WITH PHASED ARRAYS.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Askeland, Stein-Arne;
Ekman, Torbjörn.
(2014)
2D spectral estimation for unambiguous detection of automotive radar targets.
IEEE conference proceedings
Academic chapter/article/Conference paper
2013
-
Godana, Bruhtesfa;
Ekman, Torbjörn;
Kansanen, Kimmo.
(2013)
Partial Equivalent Channel Inversion Based Precoding with Mode Adaptation in Multiuser MIMO Systems.
IEEE Transactions on Wireless Communications
Academic article
-
Godana, Bruhtesfa;
Ekman, Torbjörn.
(2013)
Parametrization Based Limited Feedback Design for Correlated MIMO Channels Using New Statistical Models.
IEEE Transactions on Wireless Communications
Academic article
-
Godana, Bruhtesfa;
Ekman, Torbjörn.
(2013)
Rotative Quantization Using Adaptive Range for Temporally Correlated MIMO Channels.
IEEE Sarnoff Symposium
Academic chapter/article/Conference paper
-
Askeland, Stein-Arne;
Ekman, Torbjörn.
(2013)
Interpolated Root-Music for transversal automotive radar traffic monitoring.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Yang, Kun;
Molisch, Andreas F.;
Ekman, Torbjörn;
Røste, Terje.
(2013)
A Deterministic Round Earth Loss Model for Open-Sea Radio Propagation.
IEEE Vehicular Technology Conference (VTC) Proceedings
Academic article
-
Godana, Bruhtesfa Ebrahim;
Ekman, Torbjörn.
(2013)
Practical Multiuser MIMO Beamforming using the Strongest Eigenmodes.
IEEE Vehicular Technology Conference (VTC) Proceedings
Academic article
-
Cella, Tommaso;
Orten, Pål;
Ekman, Torbjörn.
(2013)
Wireless access using MIMO subarrays at mm-wave bands.
IEEE conference proceedings
Academic chapter/article/Conference paper
2012
-
Flåm, John Torjus;
Chatterjee, Saikat;
Kansanen, Kimmo;
Ekman, Torbjörn.
(2012)
On MMSE estimation: A Linear Model under Gaussian Mixture Statistics.
IEEE Transactions on Signal Processing
Academic article
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2012)
Experimental multipath delay profile of mobile radio channels over sea at 2 GHz.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Godana, Bruhtesfa Ebrahim;
Ekman, Torbjörn;
Tesfamicael, Solomon Abedom.
(2012)
Block Diagonal Inversion Precoding for MIMO Broadcast Channels.
IEEE Press
Academic chapter/article/Conference paper
-
Vijayandran, Luxmiram;
Byun, Sang-Soon;
Øien, Geir Egil;
Ekman, Torbjörn.
(2012)
Increasing sum-rate in large-scale cognitive radio networks by centralized power and spectrum allocation.
EURASIP Journal on Wireless Communications and Networking
Academic article
-
Vijayandran, Luxmiram;
Dharmawansa, Prathapasinghe;
Ekman, Torbjörn;
Tellambura, Chinthananda.
(2012)
Analysis of Aggregate Interference and Primary System Performance in Finite Area Cognitive Radio Networks.
IEEE Transactions on Communications
Academic article
-
Li, Xin;
Ekman, Torbjörn.
(2012)
Rayleigh Scattering Cluster Based Spatial-Temporal-Spectral Correlation Properties with MIMO-OFDM Channel Model.
IEEE Vehicular Technology Conference (VTC)
Academic article
2011
-
Li, Xin;
Ekman, Torbjörn.
(2011)
Gaussian Angular Distributed MIMO Channel Model.
IEEE Vehicular Technology Conference (VTC) Proceedings
Academic article
-
Vijayandran, Luxmiram;
Kansanen, Kimmo;
Brandt-Pearce, Maïté;
Ekman, Torbjörn.
(2011)
Energy efficient state estimation through stochastic optimization.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Godana, Bruhtesfa Ebrahim;
Ekman, Torbjörn.
(2011)
Linear prediction of time-varying MIMO systems using Givens rotations.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Godana, Bruhtesfa Ebrahim;
Ekman, Torbjörn.
(2011)
A reduced quantization range feedback method for time-varying MIMO systems.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Vijayandran, Luxmiram;
Dharmawansa, Prathapasinghe;
Ekman, Torbjörn;
Tellambura, Chinthananda.
(2011)
Aggregate Interference and System Performance in Finite Area Cognitive Radio Networks.
IEEE Sarnoff Symposium
Academic chapter/article/Conference paper
-
Vijayandran, Luxmiram;
Brandt-Pearce, Maite;
Kansanen, Kimmo;
Ekman, Torbjörn.
(2011)
Efficient State Estimation with Energy Harvesting and Fairness Control Using Stochastic Optimization.
GLOBECOM - conference record / IEEE Global Telecommunications Conference
Academic article
2010
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2010)
Land-to-ship radio channel measurements over sea at 2 GHz.
IEEE Press
Academic chapter/article/Conference paper
-
Cheffena, Michael;
Bråten, Lars Erling;
Ekman, Torbjörn;
Tjelta, Terje.
(2010)
Combined Dynamic Channel Simulator for High Capacity Broadband Fixed Wireless Access Systems.
IEEE Transactions on Antennas and Propagation
Academic article
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2010)
Channel characterization of mobile radio channel over sea at 2 GHz.
Other
-
Li, Xin;
Ekman, Torbjörn.
(2010)
Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model.
IEEE Press
Other
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2010)
Channel characterization including path loss and Doppler effects with sea reflections of mobile radio propagation over sea at 2 GHz.
IEEE Signal Processing Society
Other
-
Li, Xin;
Ekman, Torbjörn.
(2010)
Cauchy angular distribution for clustered radio propagation SIMO channel model.
IEEE Press
Academic chapter/article/Conference paper
-
Li, Xin;
Ekman, Torbjörn.
(2010)
Cauchy Angular Distribution for Clustered Radio Propagation SIMO Channel Model.
IEEE Vehicular Technology Conference (VTC) Proceedings
Academic article
-
Li, Xin;
Ekman, Torbjörn.
(2010)
Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model.
IEEE Vehicular Technology Conference (VTC)
Academic article
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2010)
Land-to-ship radio channel measurements over sea at 2 GHz.
IEEE Wireless Communications and Networking Conference
Academic article
2009
-
Cheffena, Michael;
Ekman, Torbjörn.
(2009)
Dynamic Model of Signal Fading due to Swaying Vegetation.
EURASIP Journal on Wireless Communications and Networking
Academic article
-
Cheffena, Michael;
Bråten, Lars Erling;
Ekman, Torbjörn.
(2009)
On the Space-Time Variations of Rain Attenuation.
IEEE Transactions on Antennas and Propagation
Academic article
-
Cheffena, Michael;
Ekman, Torbjörn.
(2009)
Dynamic Model of Signal Fading due to Swaying Vegetation.
EURASIP Journal on Wireless Communications and Networking
Academic article
-
Cheffena, Michael;
Bråten, Lars Erling;
Ekman, Torbjörn.
(2009)
On the Space-Time Variations of Rain Attenuation.
IEEE Transactions on Antennas and Propagation
Academic article
2008
-
Son, Le Thanh;
Ekman, Torbjörn;
Orten, Pål.
(2008)
Two-Layer CI Phase Coding Interference Cancellation and Detection of Uplink Broadband Wireless Access System.
IEEE conference proceedings
IEEE conference proceedings
Academic anthology/Conference proceedings
-
Son, Le Thanh;
Ekman, Torbjörn;
Orten, Pål.
(2008)
Iterative Two-Layer CI Phase Coding Enhancement of Uplink Broadband Wireless Access System.
IEEE conference proceedings
IEEE Vehicular Technology Conference (VTC) (10.1109/VETECF.2008.407)
Academic anthology/Conference proceedings
-
Cheffena, Michael;
Ekman, Torbjörn.
(2008)
Modeling the Dynamic Effects of Vegetation on Radiowave Propagation.
IEEE conference proceedings
IEEE International Conference on Communications (10.1109/ICC.2008.838 )
Academic anthology/Conference proceedings
-
Son, Le Thanh;
Ekman, Torbjörn;
Orten, Pål.
(2008)
Cross-Layer Random Access and Channel Assignment for Uplink Broadband Wireless System.
IEEE conference proceedings
IEEE conference proceedings
Academic anthology/Conference proceedings
-
Mercier, Bertrand;
Fodor, Viktoria;
Thobaben, Ragnar;
Skoglund, Mikael;
Koivunen, Visa;
Lindfors, Saska.
(2008)
Sensor networks for cognitive radio: Theory and system design.
International Information Management Corporation Limited
Academic chapter/article/Conference paper
-
Bang, HJ;
Ekman, Torbjörn;
Ekman, Torbjörn;
Gesbert, D.
(2008)
Channel predictive proportional fair scheduling.
IEEE Transactions on Wireless Communications
Academic article
2007
-
Bang, Hans Jørgen;
Ekman, Torbjörn.
(2007)
Opportunistic Round Robin with Extended Window for Time Correlated Channels.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Chen, Ming;
Ekman, Torbjörn;
Viberg, Mats.
(2007)
New Approaches for Channel Prediction Based on Sinusoidal Modeling.
EURASIP Journal on Advances in Signal Processing
Academic article
2006
-
Cheffena, Michael;
Bråten, Lars Erling;
Tjelta, Terje;
Ekman, Torbjörn.
(2006)
Space-time dynamic channel model for broadband fixed wireless access.
Academic chapter/article/Conference paper
Journal publications
-
Li, Xin;
Ekman, Torbjörn;
Yang, Kun.
(2024)
Multi-Cluster Approaches to Radio Sensor Array Channel Modeling and Simulation.
Sensors
Academic article
-
Quintana Diaz, Gara;
Ekman, Torbjörn;
Camanzo, Alejandro;
Birkeland, Roger;
Lago, José Miguel;
Muíño, Alberto González.
(2023)
Satellite uplink interference measurements in the 437 MHz UHF amateur radio band onboard LUME-1.
Acta Astronautica
Academic article
-
Birkeland, Roger;
Quintana DÃaz, Gara;
Honoré-Livermore, Evelyn;
Ekman, Torbjörn;
Agelet, Fernando Aguado;
Johansen, Tor Arne.
(2022)
Development of a multi-purpose SDR payload for the
HYPSO-2 satellite.
IEEE Aerospace Conference. Proceedings
Academic article
-
Quintana DÃaz, Gara;
Birkeland, Roger;
Løge, Lars;
Andersen, Even;
Bolstad, Anton;
Ekman, Torbjörn.
(2022)
In-orbit Interference Measurements and Analysis in the
VDES-band with the NorSat-2 Satellite.
IEEE Aerospace Conference. Proceedings
Academic article
-
Abraham, Jens;
Ramírez-Espinosa, Pablo;
Ekman, Torbjörn.
(2022)
Statistics of the Effective Massive MIMO Channel in Correlated Rician Fading.
IEEE Open Journal of Antennas and Propagation
Academic article
-
Quintana-Diaz, Gara;
Nodar-López, Diego;
González Muíño, Alberto;
Aguado Agelet, Fernando;
Cappelletti, Chantal;
Ekman, Torbjörn.
(2021)
Detection of radio interference in the UHF amateur radio band with the Serpens satellite.
Advances in Space Research
Academic article
-
Quintana Díaz, Gara;
Ekman, Torbjörn;
Lago Agra, José Miguel;
Hurtado de Mendoza, Diego;
González Muíño, Alberto;
Agelet, Fernando Aguado.
(2021)
In-orbit measurements and analysis of radio interference in the UHF amateur radio band from the LUME-1 satellite.
Remote Sensing
Academic article
-
Yang, Kun;
Molisch, Andreas F.;
Ekman, Torbjörn;
Røste, Terje;
Berbineau, Marion.
(2019)
A Round Earth Loss Model and Small-Scale Channel Properties for Open-Sea Radio Propagation.
IEEE Transactions on Vehicular Technology
Academic article
-
Ghiaasi , Golsa;
Abraham, Jens;
Eide, Egil;
Ekman, Torbjörn.
(2019)
Effective Channel Hardening in an Indoor Multiband Scenario.
International Journal of Wireless Information Networks
Academic article
-
Salvo Rossi, Pierluigi;
Ciuonzo, Domenico;
Kansanen, Kimmo Juhani;
Ekman, Torbjörn.
(2016)
Performance Analysis of Energy Detection for MIMO Decision Fusion in Wireless Sensor Networks over Arbitrary Fading Channels.
IEEE Transactions on Wireless Communications
Academic article
-
Ekman, Torbjörn.
(2015)
An fir predictor interpretation of LS estimation of sinusoidal amplitudes followed by extrapolation.
European Signal Processing Conference
Academic article
-
Askeland, Stein-Arne;
Ekman, Torbjörn.
(2015)
Tracking with a high-resolution 2-D spectral estimation based automotive radar.
IEEE Transactions on Intelligent Transportation Systems (T-ITS)
Academic article
-
Salvo Rossi, Pierluigi;
Ciuonzo, Domenico;
Kansanen, Kimmo;
Ekman, Torbjörn.
(2015)
On Energy Detection for MIMO Decision Fusion in Wireless Sensor Networks over NLOS Fading.
IEEE Communications Letters
Academic article
-
Salvo Rossi, Pierluigi;
Ciuonzo, Domenico;
Ekman, Torbjörn;
Dong, Hefeng.
(2015)
Energy Detection for MIMO Decision Fusion in Underwater Sensor Networks.
IEEE Sensors Journal
Academic article
-
Salvo Rossi, Pierluigi;
Ciuonzo, Domenico;
Ekman, Torbjörn.
(2015)
HMM-Based Decision Fusion in Wireless Sensor Networks with Noncoherent Multiple Access.
IEEE Communications Letters
Academic article
-
Cella, Tommaso;
Orten, Pål;
Ekman, Torbjörn.
(2014)
Design of a practical and compact mm-wave MIMO system with optimized capacity and phased arrays.
International Journal of Antennas and Propagation
Academic article
-
Godana, Bruhtesfa;
Ekman, Torbjörn;
Kansanen, Kimmo.
(2013)
Partial Equivalent Channel Inversion Based Precoding with Mode Adaptation in Multiuser MIMO Systems.
IEEE Transactions on Wireless Communications
Academic article
-
Godana, Bruhtesfa;
Ekman, Torbjörn.
(2013)
Parametrization Based Limited Feedback Design for Correlated MIMO Channels Using New Statistical Models.
IEEE Transactions on Wireless Communications
Academic article
-
Yang, Kun;
Molisch, Andreas F.;
Ekman, Torbjörn;
Røste, Terje.
(2013)
A Deterministic Round Earth Loss Model for Open-Sea Radio Propagation.
IEEE Vehicular Technology Conference (VTC) Proceedings
Academic article
-
Godana, Bruhtesfa Ebrahim;
Ekman, Torbjörn.
(2013)
Practical Multiuser MIMO Beamforming using the Strongest Eigenmodes.
IEEE Vehicular Technology Conference (VTC) Proceedings
Academic article
-
Flåm, John Torjus;
Chatterjee, Saikat;
Kansanen, Kimmo;
Ekman, Torbjörn.
(2012)
On MMSE estimation: A Linear Model under Gaussian Mixture Statistics.
IEEE Transactions on Signal Processing
Academic article
-
Vijayandran, Luxmiram;
Byun, Sang-Soon;
Øien, Geir Egil;
Ekman, Torbjörn.
(2012)
Increasing sum-rate in large-scale cognitive radio networks by centralized power and spectrum allocation.
EURASIP Journal on Wireless Communications and Networking
Academic article
-
Vijayandran, Luxmiram;
Dharmawansa, Prathapasinghe;
Ekman, Torbjörn;
Tellambura, Chinthananda.
(2012)
Analysis of Aggregate Interference and Primary System Performance in Finite Area Cognitive Radio Networks.
IEEE Transactions on Communications
Academic article
-
Li, Xin;
Ekman, Torbjörn.
(2012)
Rayleigh Scattering Cluster Based Spatial-Temporal-Spectral Correlation Properties with MIMO-OFDM Channel Model.
IEEE Vehicular Technology Conference (VTC)
Academic article
-
Li, Xin;
Ekman, Torbjörn.
(2011)
Gaussian Angular Distributed MIMO Channel Model.
IEEE Vehicular Technology Conference (VTC) Proceedings
Academic article
-
Vijayandran, Luxmiram;
Brandt-Pearce, Maite;
Kansanen, Kimmo;
Ekman, Torbjörn.
(2011)
Efficient State Estimation with Energy Harvesting and Fairness Control Using Stochastic Optimization.
GLOBECOM - conference record / IEEE Global Telecommunications Conference
Academic article
-
Cheffena, Michael;
Bråten, Lars Erling;
Ekman, Torbjörn;
Tjelta, Terje.
(2010)
Combined Dynamic Channel Simulator for High Capacity Broadband Fixed Wireless Access Systems.
IEEE Transactions on Antennas and Propagation
Academic article
-
Li, Xin;
Ekman, Torbjörn.
(2010)
Cauchy Angular Distribution for Clustered Radio Propagation SIMO Channel Model.
IEEE Vehicular Technology Conference (VTC) Proceedings
Academic article
-
Li, Xin;
Ekman, Torbjörn.
(2010)
Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model.
IEEE Vehicular Technology Conference (VTC)
Academic article
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2010)
Land-to-ship radio channel measurements over sea at 2 GHz.
IEEE Wireless Communications and Networking Conference
Academic article
-
Cheffena, Michael;
Ekman, Torbjörn.
(2009)
Dynamic Model of Signal Fading due to Swaying Vegetation.
EURASIP Journal on Wireless Communications and Networking
Academic article
-
Cheffena, Michael;
Bråten, Lars Erling;
Ekman, Torbjörn.
(2009)
On the Space-Time Variations of Rain Attenuation.
IEEE Transactions on Antennas and Propagation
Academic article
-
Cheffena, Michael;
Ekman, Torbjörn.
(2009)
Dynamic Model of Signal Fading due to Swaying Vegetation.
EURASIP Journal on Wireless Communications and Networking
Academic article
-
Cheffena, Michael;
Bråten, Lars Erling;
Ekman, Torbjörn.
(2009)
On the Space-Time Variations of Rain Attenuation.
IEEE Transactions on Antennas and Propagation
Academic article
-
Bang, HJ;
Ekman, Torbjörn;
Ekman, Torbjörn;
Gesbert, D.
(2008)
Channel predictive proportional fair scheduling.
IEEE Transactions on Wireless Communications
Academic article
-
Chen, Ming;
Ekman, Torbjörn;
Viberg, Mats.
(2007)
New Approaches for Channel Prediction Based on Sinusoidal Modeling.
EURASIP Journal on Advances in Signal Processing
Academic article
Books
-
Son, Le Thanh;
Ekman, Torbjörn;
Orten, Pål.
(2008)
Two-Layer CI Phase Coding Interference Cancellation and Detection of Uplink Broadband Wireless Access System.
IEEE conference proceedings
IEEE conference proceedings
Academic anthology/Conference proceedings
-
Son, Le Thanh;
Ekman, Torbjörn;
Orten, Pål.
(2008)
Iterative Two-Layer CI Phase Coding Enhancement of Uplink Broadband Wireless Access System.
IEEE conference proceedings
IEEE Vehicular Technology Conference (VTC) (10.1109/VETECF.2008.407)
Academic anthology/Conference proceedings
-
Cheffena, Michael;
Ekman, Torbjörn.
(2008)
Modeling the Dynamic Effects of Vegetation on Radiowave Propagation.
IEEE conference proceedings
IEEE International Conference on Communications (10.1109/ICC.2008.838 )
Academic anthology/Conference proceedings
-
Son, Le Thanh;
Ekman, Torbjörn;
Orten, Pål.
(2008)
Cross-Layer Random Access and Channel Assignment for Uplink Broadband Wireless System.
IEEE conference proceedings
IEEE conference proceedings
Academic anthology/Conference proceedings
Part of book/report
-
Ekman, Torbjörn.
(2024)
Fading Distribution Model for the Maritime Radio Channel.
IEEE (Institute of Electrical and Electronics Engineers)
Academic chapter/article/Conference paper
-
Yang, Kun;
Zhou, Ning;
Røste, Terje;
Yu, Junyi;
Li, Fang;
Chen, Wei.
(2019)
High-speed Vehicle-to-Vehicle Radio Channel Characteristics for Suburban and Municipal Lake Region at 5.9 GHz.
IEEE (Institute of Electrical and Electronics Engineers)
Academic chapter/article/Conference paper
-
Lundheim, Lars Magne;
Ekman, Torbjörn;
Gajic, Bojana;
Larsen, Bjørn B.;
Tybell, Per Thomas Martin.
(2016)
Early Innovation Projects: First Experiences from the Electronic Engineering Ladder at NTNU.
Academic chapter/article/Conference paper
-
Larsen, Bjørn B.;
Lundheim, Lars Magne;
Ekman, Torbjörn;
Tybell, Per Thomas Martin.
(2016)
Teaching Freshmen Engineering Communication.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Cella, Tommaso;
Orten, Pål;
Ekman, Torbjörn.
(2014)
MM-WAVE SHORT RANGE OUTDOOR LINKS WITH PHASED ARRAYS.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Askeland, Stein-Arne;
Ekman, Torbjörn.
(2014)
2D spectral estimation for unambiguous detection of automotive radar targets.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Godana, Bruhtesfa;
Ekman, Torbjörn.
(2013)
Rotative Quantization Using Adaptive Range for Temporally Correlated MIMO Channels.
IEEE Sarnoff Symposium
Academic chapter/article/Conference paper
-
Askeland, Stein-Arne;
Ekman, Torbjörn.
(2013)
Interpolated Root-Music for transversal automotive radar traffic monitoring.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Cella, Tommaso;
Orten, Pål;
Ekman, Torbjörn.
(2013)
Wireless access using MIMO subarrays at mm-wave bands.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2012)
Experimental multipath delay profile of mobile radio channels over sea at 2 GHz.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Godana, Bruhtesfa Ebrahim;
Ekman, Torbjörn;
Tesfamicael, Solomon Abedom.
(2012)
Block Diagonal Inversion Precoding for MIMO Broadcast Channels.
IEEE Press
Academic chapter/article/Conference paper
-
Vijayandran, Luxmiram;
Kansanen, Kimmo;
Brandt-Pearce, Maïté;
Ekman, Torbjörn.
(2011)
Energy efficient state estimation through stochastic optimization.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Godana, Bruhtesfa Ebrahim;
Ekman, Torbjörn.
(2011)
Linear prediction of time-varying MIMO systems using Givens rotations.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Godana, Bruhtesfa Ebrahim;
Ekman, Torbjörn.
(2011)
A reduced quantization range feedback method for time-varying MIMO systems.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Vijayandran, Luxmiram;
Dharmawansa, Prathapasinghe;
Ekman, Torbjörn;
Tellambura, Chinthananda.
(2011)
Aggregate Interference and System Performance in Finite Area Cognitive Radio Networks.
IEEE Sarnoff Symposium
Academic chapter/article/Conference paper
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2010)
Land-to-ship radio channel measurements over sea at 2 GHz.
IEEE Press
Academic chapter/article/Conference paper
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2010)
Channel characterization of mobile radio channel over sea at 2 GHz.
Other
-
Li, Xin;
Ekman, Torbjörn.
(2010)
Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model.
IEEE Press
Other
-
Yang, Kun;
Røste, Terje;
Bekkadal, Fritz;
Ekman, Torbjörn.
(2010)
Channel characterization including path loss and Doppler effects with sea reflections of mobile radio propagation over sea at 2 GHz.
IEEE Signal Processing Society
Other
-
Li, Xin;
Ekman, Torbjörn.
(2010)
Cauchy angular distribution for clustered radio propagation SIMO channel model.
IEEE Press
Academic chapter/article/Conference paper
-
Mercier, Bertrand;
Fodor, Viktoria;
Thobaben, Ragnar;
Skoglund, Mikael;
Koivunen, Visa;
Lindfors, Saska.
(2008)
Sensor networks for cognitive radio: Theory and system design.
International Information Management Corporation Limited
Academic chapter/article/Conference paper
-
Bang, Hans Jørgen;
Ekman, Torbjörn.
(2007)
Opportunistic Round Robin with Extended Window for Time Correlated Channels.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Cheffena, Michael;
Bråten, Lars Erling;
Tjelta, Terje;
Ekman, Torbjörn.
(2006)
Space-time dynamic channel model for broadband fixed wireless access.
Academic chapter/article/Conference paper
Report
-
Cella, Tommaso;
Ekman, Torbjörn.
(2015)
High Capacity and High Coverage mm-Wave Multi-Antenna Systems.
Doktoravhandlinger ved NTNU (2015/225)
Doctoral dissertation
Teaching
Courses
Outreach
2024
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Academic lectureEkman, Torbjörn. (2024) Fading Distribution Model for the Maritime Radio Channel. EurAAP 2024 18th European Conference on Antennas and Propagation (EuCAP) , Glasgow 2024-03-17 - 2024-03-22
2022
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Academic lectureQuintana Diaz, Gara; Ekman, Torbjörn; Camanzo-Mariño, Alejandro; Birkeland, Roger; Lago Agra, José Miguel; González Muíño, Alberto. (2022) Satellite Uplink Interference Measurements in the 437 MHz UHF Amateur Radio Band Onboard LUME-1. IAF International Astronautical Congress 2022 , Paris 2022-09-18 - 2022-09-22
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Academic lectureQuintana DÃaz, Gara; Birkeland, Roger; Løge, Lars; Andersen, Even; Bolstad, Anton; Ekman, Torbjörn. (2022) In-orbit Interference Measurements and Analysis in the VDES-band with the NorSat-2 Satellite. IEEE Aerospace Conference , Big Sky, Montana 2022-03-05 - 2022-03-12
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Academic lectureBirkeland, Roger; Quintana DÃaz, Gara; Honoré-Livermore, Evelyn; Ekman, Torbjörn; Aguado, Fernando; Johansen, Tor Arne. (2022) A Multi-purpose Software Defined Radio Payload for the HYPSO-2 Satellite. IEEE IEEE Aerospace Conference , Big Sky, Montana 2022-03-05 - 2022-03-12
2021
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Academic lectureAbraham, Jens; Ekman, Torbjörn. (2021) Local Diversity and Ultra-Reliable Antenna Arrays. 55th Asilomar Conference on Signals, Systems and Computers , Pacific Grove 2021-10-31 - 2021-11-03
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Academic lectureAbraham, Jens; Ekman, Torbjörn. (2021) Fading Margins for Large-Scale Antenna Systems. ICC 2021 - IEEE International Conference on Communications , Montreal 2021-06-14 - 2021-06-23
2020
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PosterAbraham, Jens; Ekman, Torbjörn. (2020) Achievable Synchronisation Gain In Uncalibrated Large Scale Antenna Systems. 14th European Conference on Antennas and Propagation (EuCAP) , Copenhagen 2020-03-15 - 2020-03-20
2019
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PosterQuintana Díaz, Gara; Birkeland, Roger; Honoré-Livermore, Evelyn; Ekman, Torbjörn. (2019) An SDR mission measuring UHF signal propagation and interference between small satellites in LEO and Arctic sensors. 33rd Annual AIAA/USU Conference on Small Satellites , Logan 2019-08-03 - 2019-08-08
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Academic lectureYang, Kun; Zhou, Ning; Røste, Terje; Yu, Junyi; Li, Fang; Chen, Wei. (2019) High-speed Vehicle-to-Vehicle Radio Channel Characteristics for Suburban and Municipal Lake Region at 5.9 GHz. IEEE 2019 13th European Conference on Antennas and Propagation (EuCAP) , Krakow 2019-03-31 - 2019-05-05
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PosterAbraham, Jens; Ekman, Torbjörn. (2019) Power Inversion of the Massive MIMO Channel. 9th joint WIC IEEE SP Symposium on Information Theory and signal Processing in the Benelux 2019-05-28 - 2019-05-29
2018
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Academic lectureGhiaasi Hafezi, Golsa; Abraham, Jens; Eide, Egil; Ekman, Torbjörn. (2018) Measured Channel Hardening in an Indoor Multiband Scenario. COST Action CA15104 IRACON 7th MC Meeting and 7th Technical Meeting , Cartagena 2018-05-30 - 2018-06-01
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Academic lectureYang, Kun; Zhou, Ning; Molisch, Andreas F.; Røste, Terje; Eide, Egil; Ekman, Torbjörn. (2018) Propagation measurements of mobile channel over sea at 5.9 GHz. 2018 16th International Conference on Intelligent Transportation Systems Telecommunications (ITST) , Lisbon 2018-10-15 - 2018-10-17
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Academic lectureGhiaasi Hafezi, Golsa; Abraham, Jens; Eide, Egil; Ekman, Torbjörn. (2018) Measured Channel Hardening in an Indoor Multiband Scenario. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications , Bolgna 2018-09-09 - 2018-09-12
2017
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Academic lectureLundheim, Lars Magne; Ekman, Torbjörn; Larsen, Bjørn B.; Tybell, Per Thomas Martin. (2017) Teoriforståing og identitetsbygging gjennom praktisk designarbeid. Universitets- og høgskolerådet, UHR ved fagstrategiske enhet MNT-konferansen 2017 , Oslo 2017-03-30 - 2017-03-31
2016
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Academic lectureLundheim, Lars Magne; Ekman, Torbjörn; Gajic, Bojana; Larsen, Bjørn B.; Tybell, Per Thomas Martin. (2016) Early Innovation Projects: First Experiences from the Electronic Engineering Ladder at NTNU. 2016 12th International CDIO Conference 2016-06-12 - 2016-06-16
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Academic lectureLarsen, Bjørn B.; Lundheim, Lars Magne; Ekman, Torbjörn; Tybell, Per Thomas Martin. (2016) Teaching Freshmen Engineering Communication. 11th European Workshop on Microelectronics Education (EWME) , Southampton 2016-05-11 - 2016-05-13
2015
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Academic lectureLundheim, Lars; Tybell, Thomas; Larsen, Bjørn B.; Ekman, Torbjörn. (2015) Den elektroniske ingeniørstigen – En tiltakspakke for mestring og identitetsbygging. Nasjonalt senter for realfagsrekruttering MNT-konferansen 2015 , Bergen 2015-03-18 -
2013
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Academic lectureAskeland, Stein-Arne; Ekman, Torbjörn. (2013) Interpolated Root-Music for transversal automotive radar traffic monitoring. European Microwave Association European Microwave Week 2013 , Nürnberg 2013-11-06 - 2013-11-11
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Academic lectureGodana, Bruhtesfa Ebrahim; Ekman, Torbjörn. (2013) Practical Multiuser MIMO Beamforming using the Strongest Eigenmodes. IEEE Vehicular Technology Conference, VTC-Spring 2013 , Dresden 2013-06-02 - 2013-06-06
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Academic lectureGodana, Bruhtesfa; Ekman, Torbjörn. (2013) Rotative Quantization Using Adaptive Range for Temporally Correlated MIMO Channels. IEEE Int. Symp. on Personal, Indoor and Mobile Radio Communications (PIMRC) , London 2013-09-08 - 2013-09-11
2012
-
Academic lectureGodana, Bruhtesfa Ebrahim; Ekman, Torbjörn; Tesfamicael, Solomon Abedom. (2012) Block Diagonal Inversion Precoding for MIMO Broadcast Channels. Vehicular Technology Conference, VTC 2012-Fall 2012-09-03 - 2012-09-06
-
Academic lectureYang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2012) Experimental multipath delay profile of mobile radio channels over sea at 2 GHz. IEEE Antennas and Propagation Conference (LAPC), 2012 Loughborough , Loughborough 2012-11-12 - 2012-11-13
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PosterLi, Xin; Ekman, Torbjörn. (2012) Rayleigh Scattering Cluster Based Spatial-Temporal-Spectral Correlation Properties with MIMO-OFDM Channel Model. IEEE Vehicular Technology Conference (VTC Fall), 2012 , Quebece 2012-09-03 - 2012-09-06
2011
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Popular scientific lectureYang, Kun; Ekman, Torbjörn; Røste, Terje; Bekkadal, Fritz. (2011) A quasi-deterministic path loss propagation model for the open sea environment. IEEE proceeding of the 14th International Symposium on Wireless Personal Multimedia Communications , Brest 2011-10-03 - 2011-10-07
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Academic lectureVijayandran, Luxmiram; Brandt-Pearce, Maite; Kansanen, Kimmo; Ekman, Torbjörn. (2011) Efficient State Estimation with Energy Harvesting and Fairness Control Using Stochastic Optimization. IEEE IEEE Global Communications Conference (GLOBECOM) 2011 , Houston 2011-12-05 - 2011-12-09
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Academic lectureVijayandran, Luxmiram; Dharmawansa, Prathapasinghe; Ekman, Torbjörn; Tellambura, Chinthananda. (2011) Aggregate Interference and System Performance in Finite Area Cognitive Radio Networks. The 22nd Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2011) , Toronto 2011-09-11 - 2011-09-14
2010
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Academic lectureLi, Xin; Ekman, Torbjörn. (2010) Cauchy Angular Distribution for Clustered Radio Propagation SIMO Channel Model. IEEE Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st , Taipei 2010-05-16 - 2010-05-19
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Academic lectureLi, Xin; Ekman, Torbjörn. (2010) Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model. IEEE Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd , Ottawa, ON 2010-09-06 - 2010-09-09
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Academic lectureYang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2010) Channel characterization including path loss and Doppler effects with sea reflections of mobile radio propagation over sea at 2 GHz. The 2010 International Conference on Wireless Communications and Signal Processing , Suzhou 2010-10-21 - 2010-10-23
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Academic lectureYang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2010) Channel characterization of mobile radio channel over sea at 2 GHz. 10th Mediterranean Microwave Symposium 2010-08-25 - 2010-08-27
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Academic lectureYang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2010) Land-to-ship radio channel measurements over sea at 2 GHz. IEEE International Conference on Wireless Communications, Networking and Mobile Computing 2010-09-23 - 2010-09-25
2009
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Academic lectureVijayandran, Luxmiram; Byun, Sang-Seon; Øien, Geir Egil; Ekman, Torbjörn. (2009) Increasing sum rate in multiband cognitive radio networks by centralized power allocation schemes. IEEE IEEE Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) , Tokyo 2009-09-13 - 2009-09-16
2008
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Academic lectureMercier, Bertrand; Fodor, Viktoria; Thobaben, Ragnar; Skoglund, Mikael; Koivunen, Visa; Lindfors, Saska. (2008) Sensor networks for cognitive radio: Theory and system design. European Commission ICT Mobile Summit 2008 , Stockholm 2008-06-10 - 2008-06-12
2006
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Academic lectureCheffena, Michael ; Bråten, Lars Erling; Tjelta, Terje; Ekman, Torbjörn. (2006) Time dynamic channel model for broadband fixed wireless access systems. IST IST Mobile and wireless summit 2006 , Myconos 2006-06-04 - 2006-06-08
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Academic lectureSon, Le Thanh; Ekman, Torbjörn; Orten, Pål. (2006) Performance of the multi-carrier LMDS system at the 28 GHz radio frequency band. MOSHARAKA, IEEE Communications Society Mobile Computing and Wireless Communications International Conference (MCWC), Amman , Amman 2006-09-17 - 2006-09-17
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Academic lectureCheffena, Michael ; Bråten, Lars Erling; Tjelta, Terje; Ekman, Torbjörn. (2006) Space-time dynamic channel model for broadband fixed wireless access. European Network of Excellence ACE The first European Conference on Antennas and Propagation (EuCAP 2006) , Nice 2006-11-06 - 2006-11-10