Nils Torbjörn Ekman

About

Nils Torbjørn 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. Leading the CAMOS (Coastal and Arctic Maritime Operations and Surveillance) sensor networks project at IME/NTNU. Member of the leader group for NTNU Ocean Science and Technology, one of four strategic NTNU initiatives. 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 4 PhD students, and is an external supervisor and co-supervisor for PhD students at UniK and NTNU. In addition Ekman supervises about 2 MSc students a year.

Fields of expertise

Statistical channel modeling for the dynamics of wireless radio channels
Radio resource management (RRM)
Prediction of radio channels for applications in adaptive modulation and RRM
Sensor networks
Exploiting subspace descriptions of MIMO channels
High resolution spectral estimation techniques

Work Experience

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

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

2022

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. volum 3.

2021

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. volum 13 (16).
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.

2019

Ghiaasi, Golsa; Abraham, Jens; Eide, Egil; Ekman, Torbjörn. (2019) Effective Channel Hardening in an Indoor Multiband Scenario. International Journal of Wireless Information Networks.
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. volum 68 (9).
Yang, Kun; Zhou, Ning; Røste, Terje; Yu, Junyi; Li, Fang; Chen, Wei; Eide, Egil; Ekman, Torbjörn; Li, Changzhen; Chang, Fuxing. (2019) High-speed Vehicle-to-Vehicle Radio Channel Characteristics for Suburban and Municipal Lake Region at 5.9 GHz. 2019 13th European Conference on Antennas and Propagation (EuCAP 2019).

2016

Larsen, Bjørn B.; Lundheim, Lars Magne; Ekman, Torbjörn; Tybell, Per Thomas Martin. (2016) Teaching Freshmen Engineering Communication. Proceedings of the 11th European Workshop on Microelectronics Education (EWME 2016).
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. Proceedings of the 12th International CDIO Conference.
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. volum 15 (11).

2015

Askeland, Stein-Arne; Ekman, Torbjörn. (2015) Tracking with a high-resolution 2-D spectral estimation based automotive radar. IEEE transactions on intelligent transportation systems (Print). volum 16 (5).
Cella, Tommaso; Ekman, Torbjörn. (2015) High Capacity and High Coverage mm-Wave Multi-Antenna Systems. 2015. ISBN 978-82-326-1106-5. Doktoravhandlinger ved NTNU (2015/225).
Ekman, Torbjörn. (2015) An fir predictor interpretation of LS estimation of sinusoidal amplitudes followed by extrapolation. European Signal Processing Conference. volum 06-10-September-2004.
Salvo Rossi, Pierluigi; Ciuonzo, Domenico; Ekman, Torbjörn. (2015) HMM-Based Decision Fusion in Wireless Sensor Networks with Noncoherent Multiple Access. IEEE Communications Letters. volum 19 (5).
Salvo Rossi, Pierluigi; Ciuonzo, Domenico; Ekman, Torbjörn; Dong, Hefeng. (2015) Energy Detection for MIMO Decision Fusion in Underwater Sensor Networks. IEEE Sensors Journal. volum 15 (3).
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. volum 19 (2).

2014

Askeland, Stein-Arne; Ekman, Torbjörn. (2014) 2D spectral estimation for unambiguous detection of automotive radar targets. Radar Conference, 2014 IEEE.
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. volum 2014.
Cella, Tommaso; Orten, Pål; Ekman, Torbjörn. (2014) MM-WAVE SHORT RANGE OUTDOOR LINKS WITH PHASED ARRAYS. Communications, Control and Signal Processing (ISCCSP), 2014 6th International Symposium on.

2013

Askeland, Stein-Arne; Ekman, Torbjörn. (2013) Interpolated Root-Music for transversal automotive radar traffic monitoring. European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuRAD 2013: 10th European Radar Conference.
Cella, Tommaso; Orten, Pål; Ekman, Torbjörn. (2013) Wireless access using MIMO subarrays at mm-wave bands. International Symposium on Wireless and Pervasive Computing, ISWPC 2013.
Godana, Bruhtesfa Ebrahim; Ekman, Torbjörn. (2013) Practical Multiuser MIMO Beamforming using the Strongest Eigenmodes. IEEE Vehicular Technology Conference (VTC) Proceedings.
Godana, Bruhtesfa; Ekman, Torbjörn. (2013) Parametrization Based Limited Feedback Design for Correlated MIMO Channels Using New Statistical Models. IEEE Transactions on Wireless Communications. volum 12 (10).
Godana, Bruhtesfa; Ekman, Torbjörn. (2013) Rotative Quantization Using Adaptive Range for Temporally Correlated MIMO Channels. Personal Indoor and Mobile Radio Communications (PIMRC), 2013 IEEE 24th International Symposium on.
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. volum 12 (7).
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.

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. volum 60 (7).
Godana, Bruhtesfa Ebrahim; Ekman, Torbjörn; Tesfamicael, Solomon Abedom. (2012) Block Diagonal Inversion Precoding for MIMO Broadcast Channels. Vehicular Technology Conference (VTC Fall), 2012 IEEE.
Li, Xin; Ekman, Torbjörn. (2012) Rayleigh Scattering Cluster Based Spatial-Temporal-Spectral Correlation Properties with MIMO-OFDM Channel Model. IEEE Vehicular Technology Conference (VTC).
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. volum 2012 (362).
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. volum 60 (7).
Yang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2012) Experimental multipath delay profile of mobile radio channels over sea at 2 GHz. Antennas and Propagation Conference (LAPC), 2012 Loughborough.

2011

Godana, Bruhtesfa Ebrahim; Ekman, Torbjörn. (2011) A reduced quantization range feedback method for time-varying MIMO systems. Wireless Communications and Mobile Computing Conference (IWCMC), 2011 7th International.
Godana, Bruhtesfa Ebrahim; Ekman, Torbjörn. (2011) Linear prediction of time-varying MIMO systems using Givens rotations. Signal Processing Advances in Wireless Communications (SPAWC), 2011 IEEE 12th International Workshop on.
Li, Xin; Ekman, Torbjörn. (2011) Gaussian Angular Distributed MIMO Channel Model. IEEE Vehicular Technology Conference (VTC) Proceedings.
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.
Vijayandran, Luxmiram; Dharmawansa, Prathapasinghe; Ekman, Torbjörn; Tellambura, Chinthananda. (2011) Aggregate Interference and System Performance in Finite Area Cognitive Radio Networks. PIMRC'11: 2011 IEEE 22nd International Symposium on Personal,Indoor and Mobile Radio Communications.
Vijayandran, Luxmiram; Kansanen, Kimmo; Brandt-Pearce, Maïté; Ekman, Torbjörn. (2011) Energy efficient state estimation through stochastic optimization. Signal Processing Advances in Wireless Communications (SPAWC), 2011 IEEE 12th International Workshop on.

2010

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. volum 58 (10).
Li, Xin; Ekman, Torbjörn. (2010) Cauchy Angular Distribution for Clustered Radio Propagation SIMO Channel Model. IEEE Vehicular Technology Conference (VTC) Proceedings.
Li, Xin; Ekman, Torbjörn. (2010) Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model. IEEE Vehicular Technology Conference (VTC).
Li, Xin; Ekman, Torbjörn. (2010) Cauchy angular distribution for clustered radio propagation SIMO channel model. Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st : ProceedingsTaipei, Taiwan 16-19 May 2010.
Li, Xin; Ekman, Torbjörn. (2010) Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model. Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd.
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.
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. Proceedings of the International Conference on Wireless Communications and Signal Processing (WCSP), 2010.
Yang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2010) Channel characterization of mobile radio channel over sea at 2 GHz. Proceeding of 10th Mediterranean Microwave Symposium (MMS).
Yang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2010) Land-to-ship radio channel measurements over sea at 2 GHz. 2010 6th International Conference on Wireless Communications, Networking and Mobile Computing : WICOM : September 23-25 2010, Chengsu, China.

2009

Cheffena, Michael; Bråten, Lars Erling; Ekman, Torbjörn. (2009) On the Space-Time Variations of Rain Attenuation. IEEE Transactions on Antennas and Propagation. volum 57 (6).
Cheffena, Michael; Bråten, Lars Erling; Ekman, Torbjörn. (2009) On the Space-Time Variations of Rain Attenuation. IEEE Transactions on Antennas and Propagation. volum 57 (6).
Cheffena, Michael; Ekman, Torbjörn. (2009) Dynamic Model of Signal Fading due to Swaying Vegetation. EURASIP Journal on Wireless Communications and Networking.
Cheffena, Michael; Ekman, Torbjörn. (2009) Dynamic Model of Signal Fading due to Swaying Vegetation. EURASIP Journal on Wireless Communications and Networking.

2008

Bang, HJ; Ekman, Torbjörn; Ekman, Torbjörn; Gesbert, D. (2008) Channel predictive proportional fair scheduling. IEEE Transactions on Wireless Communications. volum 7 (2).
Cheffena, Michael; Ekman, Torbjörn. (2008) Modeling the Dynamic Effects of Vegetation on Radiowave Propagation. IEEE conference proceedings. 2008. ISBN 978-1-4244-2075-9. IEEE International Conference on Communications (10.1109/ICC.2008.838).
Mercier, Bertrand; Fodor, Viktoria; Thobaben, Ragnar; Skoglund, Mikael; Koivunen, Visa; Lindfors, Saska; Ryynänen, Jussi; Larsson, Erik G.; Petrioli, Chiara; Bongiovanni, Gianni; Grøndalen, Ole; Kansanen, Kimmo; Ekman, Torbjörn; Øien, Geir Egil; Hayar, Aawatif M.; Knopp, Raymond; Lozano, Baltasar B.. (2008) Sensor networks for cognitive radio: Theory and system design. ICT-Mobile Summit 2008, 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. 2008. ISBN 9781424416448.
Son, Le Thanh; Ekman, Torbjörn; Orten, Pål. (2008) Iterative Two-Layer CI Phase Coding Enhancement of Uplink Broadband Wireless Access System. IEEE conference proceedings. 2008. ISBN 9781424417216. Proceedings of the IEEE VTS Vehicular Technology Conference (10.1109/VETECF.2008.407).
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. 2008. ISBN 9781424419968.

2007

Bang, Hans Jørgen; Ekman, Torbjörn. (2007) Opportunistic Round Robin with Extended Window for Time Correlated Channels. Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th.
Chen, Ming; Ekman, Torbjörn; Viberg, Mats. (2007) New Approaches for Channel Prediction Based on Sinusoidal Modeling. EURASIP Journal on Advances in Signal Processing. volum 2007.

2006

Cheffena, Michael; Bråten, Lars Erling; Tjelta, Terje; Ekman, Torbjörn. (2006) Space-time dynamic channel model for broadband fixed wireless access. The first European Conference on Antennas and Propagation (EuCAP 2006).

Journal publications

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. volum 3.
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. volum 13 (16).
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.
Ghiaasi, Golsa; Abraham, Jens; Eide, Egil; Ekman, Torbjörn. (2019) Effective Channel Hardening in an Indoor Multiband Scenario. International Journal of Wireless Information Networks.
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. volum 68 (9).
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. volum 15 (11).
Askeland, Stein-Arne; Ekman, Torbjörn. (2015) Tracking with a high-resolution 2-D spectral estimation based automotive radar. IEEE transactions on intelligent transportation systems (Print). volum 16 (5).
Ekman, Torbjörn. (2015) An fir predictor interpretation of LS estimation of sinusoidal amplitudes followed by extrapolation. European Signal Processing Conference. volum 06-10-September-2004.
Salvo Rossi, Pierluigi; Ciuonzo, Domenico; Ekman, Torbjörn. (2015) HMM-Based Decision Fusion in Wireless Sensor Networks with Noncoherent Multiple Access. IEEE Communications Letters. volum 19 (5).
Salvo Rossi, Pierluigi; Ciuonzo, Domenico; Ekman, Torbjörn; Dong, Hefeng. (2015) Energy Detection for MIMO Decision Fusion in Underwater Sensor Networks. IEEE Sensors Journal. volum 15 (3).
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. volum 19 (2).
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. volum 2014.
Godana, Bruhtesfa Ebrahim; Ekman, Torbjörn. (2013) Practical Multiuser MIMO Beamforming using the Strongest Eigenmodes. IEEE Vehicular Technology Conference (VTC) Proceedings.
Godana, Bruhtesfa; Ekman, Torbjörn. (2013) Parametrization Based Limited Feedback Design for Correlated MIMO Channels Using New Statistical Models. IEEE Transactions on Wireless Communications. volum 12 (10).
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. volum 12 (7).
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.
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. volum 60 (7).
Li, Xin; Ekman, Torbjörn. (2012) Rayleigh Scattering Cluster Based Spatial-Temporal-Spectral Correlation Properties with MIMO-OFDM Channel Model. IEEE Vehicular Technology Conference (VTC).
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. volum 2012 (362).
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. volum 60 (7).
Li, Xin; Ekman, Torbjörn. (2011) Gaussian Angular Distributed MIMO Channel Model. IEEE Vehicular Technology Conference (VTC) Proceedings.
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.
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. volum 58 (10).
Li, Xin; Ekman, Torbjörn. (2010) Cauchy Angular Distribution for Clustered Radio Propagation SIMO Channel Model. IEEE Vehicular Technology Conference (VTC) Proceedings.
Li, Xin; Ekman, Torbjörn. (2010) Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model. IEEE Vehicular Technology Conference (VTC).
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.
Cheffena, Michael; Bråten, Lars Erling; Ekman, Torbjörn. (2009) On the Space-Time Variations of Rain Attenuation. IEEE Transactions on Antennas and Propagation. volum 57 (6).
Cheffena, Michael; Bråten, Lars Erling; Ekman, Torbjörn. (2009) On the Space-Time Variations of Rain Attenuation. IEEE Transactions on Antennas and Propagation. volum 57 (6).
Cheffena, Michael; Ekman, Torbjörn. (2009) Dynamic Model of Signal Fading due to Swaying Vegetation. EURASIP Journal on Wireless Communications and Networking.
Cheffena, Michael; Ekman, Torbjörn. (2009) Dynamic Model of Signal Fading due to Swaying Vegetation. EURASIP Journal on Wireless Communications and Networking.
Bang, HJ; Ekman, Torbjörn; Ekman, Torbjörn; Gesbert, D. (2008) Channel predictive proportional fair scheduling. IEEE Transactions on Wireless Communications. volum 7 (2).
Chen, Ming; Ekman, Torbjörn; Viberg, Mats. (2007) New Approaches for Channel Prediction Based on Sinusoidal Modeling. EURASIP Journal on Advances in Signal Processing. volum 2007.

Report/dissertation

Cella, Tommaso; Ekman, Torbjörn. (2015) High Capacity and High Coverage mm-Wave Multi-Antenna Systems. 2015. ISBN 978-82-326-1106-5. Doktoravhandlinger ved NTNU (2015/225).

Part of book/report

Yang, Kun; Zhou, Ning; Røste, Terje; Yu, Junyi; Li, Fang; Chen, Wei; Eide, Egil; Ekman, Torbjörn; Li, Changzhen; Chang, Fuxing. (2019) High-speed Vehicle-to-Vehicle Radio Channel Characteristics for Suburban and Municipal Lake Region at 5.9 GHz. 2019 13th European Conference on Antennas and Propagation (EuCAP 2019).
Larsen, Bjørn B.; Lundheim, Lars Magne; Ekman, Torbjörn; Tybell, Per Thomas Martin. (2016) Teaching Freshmen Engineering Communication. Proceedings of the 11th European Workshop on Microelectronics Education (EWME 2016).
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. Proceedings of the 12th International CDIO Conference.
Askeland, Stein-Arne; Ekman, Torbjörn. (2014) 2D spectral estimation for unambiguous detection of automotive radar targets. Radar Conference, 2014 IEEE.
Cella, Tommaso; Orten, Pål; Ekman, Torbjörn. (2014) MM-WAVE SHORT RANGE OUTDOOR LINKS WITH PHASED ARRAYS. Communications, Control and Signal Processing (ISCCSP), 2014 6th International Symposium on.
Askeland, Stein-Arne; Ekman, Torbjörn. (2013) Interpolated Root-Music for transversal automotive radar traffic monitoring. European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuRAD 2013: 10th European Radar Conference.
Cella, Tommaso; Orten, Pål; Ekman, Torbjörn. (2013) Wireless access using MIMO subarrays at mm-wave bands. International Symposium on Wireless and Pervasive Computing, ISWPC 2013.
Godana, Bruhtesfa; Ekman, Torbjörn. (2013) Rotative Quantization Using Adaptive Range for Temporally Correlated MIMO Channels. Personal Indoor and Mobile Radio Communications (PIMRC), 2013 IEEE 24th International Symposium on.
Godana, Bruhtesfa Ebrahim; Ekman, Torbjörn; Tesfamicael, Solomon Abedom. (2012) Block Diagonal Inversion Precoding for MIMO Broadcast Channels. Vehicular Technology Conference (VTC Fall), 2012 IEEE.
Yang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2012) Experimental multipath delay profile of mobile radio channels over sea at 2 GHz. Antennas and Propagation Conference (LAPC), 2012 Loughborough.
Godana, Bruhtesfa Ebrahim; Ekman, Torbjörn. (2011) A reduced quantization range feedback method for time-varying MIMO systems. Wireless Communications and Mobile Computing Conference (IWCMC), 2011 7th International.
Godana, Bruhtesfa Ebrahim; Ekman, Torbjörn. (2011) Linear prediction of time-varying MIMO systems using Givens rotations. Signal Processing Advances in Wireless Communications (SPAWC), 2011 IEEE 12th International Workshop on.
Vijayandran, Luxmiram; Dharmawansa, Prathapasinghe; Ekman, Torbjörn; Tellambura, Chinthananda. (2011) Aggregate Interference and System Performance in Finite Area Cognitive Radio Networks. PIMRC'11: 2011 IEEE 22nd International Symposium on Personal,Indoor and Mobile Radio Communications.
Vijayandran, Luxmiram; Kansanen, Kimmo; Brandt-Pearce, Maïté; Ekman, Torbjörn. (2011) Energy efficient state estimation through stochastic optimization. Signal Processing Advances in Wireless Communications (SPAWC), 2011 IEEE 12th International Workshop on.
Li, Xin; Ekman, Torbjörn. (2010) Cauchy angular distribution for clustered radio propagation SIMO channel model. Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st : ProceedingsTaipei, Taiwan 16-19 May 2010.
Li, Xin; Ekman, Torbjörn. (2010) Cauchy Power Azimuth Spectrum for Clustered Radio Propagation MIMO Channel Model. Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd.
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. Proceedings of the International Conference on Wireless Communications and Signal Processing (WCSP), 2010.
Yang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2010) Channel characterization of mobile radio channel over sea at 2 GHz. Proceeding of 10th Mediterranean Microwave Symposium (MMS).
Yang, Kun; Røste, Terje; Bekkadal, Fritz; Ekman, Torbjörn. (2010) Land-to-ship radio channel measurements over sea at 2 GHz. 2010 6th International Conference on Wireless Communications, Networking and Mobile Computing : WICOM : September 23-25 2010, Chengsu, China.
Mercier, Bertrand; Fodor, Viktoria; Thobaben, Ragnar; Skoglund, Mikael; Koivunen, Visa; Lindfors, Saska; Ryynänen, Jussi; Larsson, Erik G.; Petrioli, Chiara; Bongiovanni, Gianni; Grøndalen, Ole; Kansanen, Kimmo; Ekman, Torbjörn; Øien, Geir Egil; Hayar, Aawatif M.; Knopp, Raymond; Lozano, Baltasar B.. (2008) Sensor networks for cognitive radio: Theory and system design. ICT-Mobile Summit 2008, Conference Proceedings.
Bang, Hans Jørgen; Ekman, Torbjörn. (2007) Opportunistic Round Robin with Extended Window for Time Correlated Channels. Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th.
Cheffena, Michael; Bråten, Lars Erling; Tjelta, Terje; Ekman, Torbjörn. (2006) Space-time dynamic channel model for broadband fixed wireless access. The first European Conference on Antennas and Propagation (EuCAP 2006).

Books

Cheffena, Michael; Ekman, Torbjörn. (2008) Modeling the Dynamic Effects of Vegetation on Radiowave Propagation. IEEE conference proceedings. 2008. ISBN 978-1-4244-2075-9. IEEE International Conference on Communications (10.1109/ICC.2008.838).
Son, Le Thanh; Ekman, Torbjörn; Orten, Pål. (2008) Cross-Layer Random Access and Channel Assignment for Uplink Broadband Wireless System. IEEE conference proceedings. 2008. ISBN 9781424416448.
Son, Le Thanh; Ekman, Torbjörn; Orten, Pål. (2008) Iterative Two-Layer CI Phase Coding Enhancement of Uplink Broadband Wireless Access System. IEEE conference proceedings. 2008. ISBN 9781424417216. Proceedings of the IEEE VTS Vehicular Technology Conference (10.1109/VETECF.2008.407).
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. 2008. ISBN 9781424419968.

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