Thomas Zemen

Current Projects

NFN SISE - National Research Network: Signal and Information Processing in Science and Engineering

I-0 - Signal and Information Processing

Lecture

Vehicular Wireless Communications (389.144), course at Vienna University of Technology, summer term 2012.

Past courses:

• Cooperative Communications (2009-2011)
• MIMO Communications (2007-2008)

Wireless Channel Measurements

MIMO and vehicular channel measurements - joint measurement campaign
with Lund University, Vienna University of Technology, and FTW Forschungszentrum Telekommunikation Wien

Publications

see also Google Scholar Citations

Book Chapters

• Vehicular Channels
  L. Bernadó, N. Czink, T. Zemen, A. Paier, F. Tufvesson, C. F. Mecklenbräuker, A. F. Molisch, in LTE Advanced and Beyond Wireless Networks: Channel Modeling and Propagation, Ed. G. de la Roche, A. Alayón, and B. Allen, John Wiley and Sons, 2012, to be published.
• Wireless Access in Vehicular Environments
  T. Zemen, L. Bernadó, K. Sjöberg, E. Uhlemann, in Pervasive Mobile & Ambient Wireless Communications, The COST Action 2100, Ed. Roberto Verdone, Springer 2012.
• Multi-user MIMO receiver processing for time-varying channels
  C. Dumard, J. Jalden, and T. Zemen, in Wireless Communications over Rapidly Time-Varying Channels, Eds. F. Hlawatsch and G. Matz, Academic Press, 2011.
• Multiuser MIMO channel equalization
  C. F. Mecklenbräuker, J. Wehinger, T. Zemen, H. Artés, and F. Hlawatsch, in Smart Antennas---State of the Art, Eds. T. Kaiser, A. Bourdoux, H. Boche, J. R. Fonollosa, J. Bach Andersen, W. Utschick, Section 1.4, EURASIP Book Series on Signal Processing and Communications, New York (NY): Hindawi, 2006, pp. 53--76.

Journal Papers

• Adaptive reduced-rank time-variant channel estimation using subspace selection
  T. Zemen, and A. F. Molisch, IEEE Transactions on Vehicular Technology, submitted.
• Characterization of non-stationary channels using mismatched wiener filtering
  A. Ispas, M. Dörpinghaus, G. Ascheid and T. Zemen, IEEE Transactions on Signal Processing, submitted.
• Partner selection in indoor-to-outdoor cooperative networks: an experimental study
  P. Castiglione, S. Savazzi, M. Nicoli, and T. Zemen, IEEE Journal on Selected Areas in Communications, special issue on Theories and Methods for Advanced Wireless Relays, to be published.
• Receive antenna selection for time-varying channels using discrete prolate spheroidal sequences
  H. A. Saleh, A. F. Molisch, T. Zemen, S. D. Blostein, and N. B. Mehta, IEEE Transaction on Wireless Communications, to be published.
• Energy management policies for enery-neutral source-channel coding
  P. Castiglione, O. Simeone, E. Erkip, and T. Zemen, IEEE Transactions on Communications, to be published.
• Iterative time-variant channel estimation for 802.11p using generalized discrete prolate spheroidal sequences
  T. Zemen, L. Bernado, N. Czink, and A. Molisch, IEEE Transactions on Vehicular Technology, vol. 61, no. 3, pp. 1222-1233, March 2012, doi.
• Analytical multi-user MIMO channel modeling: Subspace alignment matters
  N. Czink, B. Bandemer, C. Oestges, T. Zemen, and A. Paulraj, IEEE Transactions on Wireless Communications, vol. 11, no. 1, pp. 367-377, January 2012.
• Funkkommunikation für intelligente Verkehrssysteme — Status und Ausblick
  T. Zemen, N. Czink, L. Bernadó, and C. Vogel, E & I Elektrotechnik und Informationstechnik, no. 7-8, pp. 276-281, July/August 2011, invited survey paper.
• Vehicular channel characterization and its implications for wireless system design and performance
  C. F. Mecklenbräuker, A. F. Molisch, J. Karedal, F. Tufvesson, A. Paier, L. Bernadó, T. Zemen, O. Klemp, and N. Czink, Proceedings of the IEEE, special issue on Vehicular Communications, vol. 99, no. 7, pp. 1189-1212, July 2011, doi.
• On wireless links for vehicle-to-infrastructure communications
  P. Belanovic, D. Valerio, A. Paier, T. Zemen, F. Ricciato, and C. F. Mecklenbräuker, IEEE Transactions on Vehicular Technology, vol. 59, no. 1, pp. 269-282, January 2010.
• A geometry-based stochastic MIMO model for vehicle-to-vehicle communications
  J. Karedal, F. Tufvesson, N. Czink, A. Paier, C. Dumard, T. Zemen, C. F. Mecklenbräuker, and A. F. Molisch, IEEE Transactions on Wireless Communications, vol. 8, no. 7, pp. 3646-3657, July 2009.
• A time-variant MIMO channel model directly parametrised from measurements
  N. Czink, T. Zemen, J. Nuutinen, J. Ylitalo, and E. Bonek, EURASIP Journal on Wireless Communications and Networking (special issue on "Advances in Propagation Modelling for Wireless Systems"), vol. 2009, doi.
• Characterization of vehicle-to-vehicle radio channels from measurements at 5.2 GHz
  A. Paier, J. Karedal, N. Czink, C. Dumard, T. Zemen, F. Tufvesson, A. F. Molisch, and C. F. Mecklenbräucker, Wireless Personal Communications, vol. 50, no.1, pp. 19-32, July 2009, doi.
• Low-complexity MIMO multiuser receiver: A joint antenna detection scheme for time-varying channels
  C. Dumard and T. Zemen, IEEE Transactions on Signal Processing, vol. 56, no. 7, pp. 2931-2940, July 2008. Erratum.
• Minimum-energy band-limited predictor with dynamic subspace selection for time-variant flat-fading channels
  T. Zemen, C. F. Mecklenbräuker, F. Kaltenberger, and B. H. Fleury, IEEE Transactions on Signal Processing, vol. 55, no. 9, pp. 4534-4548, September 2007. Erratum
• Low-complexity geometry-based MIMO channel simulation
  F. Kaltenberger, T. Zemen, and C. Ueberhuber, EURASIP Journal on Advances in Signal Processing, vol. 2007, Article ID 95281, 17 pages, 2007, doi.
• Iterative joint time-variant channel estimation and multi-user detection for MC-CDMA
  T. Zemen, C. F. Mecklenbräuker, J. Wehinger, and R. R. Müller, IEEE Transactions on Wireless Communications, vol. 5, no. 6, pp. 1469-1478, June 2006. Erratum
• Time-variant channel estimation using discrete prolate spheroidal sequences
  T. Zemen and C. F. Mecklenbräuker, IEEE Transactions on Signal Processing, vol. 53, no. 9, pp. 3597-3607, September 2005.

Conference Papers and Contributions to European Research Initiatives

2012

• Channel estimation for intelligent transportation systems
  L. Bernadó, T. Zemen, N. Czink, P. Fuxjäger, F. Sánchez, V. Shivaldova, C.F. Mecklenbräuker, A. Paier, D. Smely, M. Jandrisits, B. Rainer, and C. Vogel, in ITS World Congress Conference, Vienna, Austria. October 2012, submitted overview paper.
• The (in-)validity of the WSSUS assumption in vehicular radio channels
  L. Bernadó, T. Zemen, F. Tufvesson, A. F. Molisch, C. F. Mecklenbräuker, in IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sydney, Australia, September 9-12, 2012, submitted.
• Performance comparison of relaying and user cooperation in multi-cell scenarios
  F. Sánchez, N. Czink, T. Zemen, in IEEE 75th Vehicular Technology Conference (VTC-Spring), Yokohama, Japan, May 2012, to be presented.
• Antenna selection for time-varying channels based on Slepian subspace projections
  H. A. Saleh, A. F. Molisch, T. Zemen, S. D. Blostein, and N. B. Mehta, in IEEE International Conference on Communications (ICC), Ottawa, Canada, June 2012, to be presented.

2011

• Energy-harvesting for source-channel coding in cyber-physical systems
  P. Castiglione, O. Simeone, E. Erkip and T. Zemen, in 4th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP), San Juan, Puerto Rico, December 2011.
• Time-varying radio channel parameters: characterization in vehicular channels
  L. Bernadó and T. Zemen, temporary document TD(11)02022 presented at COST IC1004 Meeting, Lisbon, Portugal, October 19-21, 2011.
• Distributed QR factorization based on randomized algorithms
  H. Straková, W. Gansterer, and T. Zemen, in 9th International Conference on Parallel Processing and Applied Mathematics (PPAM), Torun, Poland, September 2011.
• Subspace modeling of multi-user MIMO channels
  N. Czink, B. Bandemer, C. Oestges, T. Zemen, and A. Paulraj, in IEEE 74th Vehicular Technology Conference (VTC-Fall), San Francisco, USA, September 2011, best paper award.
• Cooperative space-time coded OFDM with timing errors and carrier frequency offsets
  F. Sánchez, T. Zemen, G. Matz, F. Kaltenberger and N. Czink, in IEEE International Conference on Communications (ICC) Wireless Communications Symposium, Kyoto, Japan, June 2011.
• Distributed field estimation algorithms in vehicular sensor networks
  D. Schabus, T. Zemen and M. Pucher, in IEEE 73rd Vehicular Technology Conference (VTC-Spring), Budapest, Hungary, May 2011.
• Inter-carrier interference estimation in MIMO OFDM systems with arbitrary pilot structure
  M. Šimko, C. Mehlführer, T. Zemen, and M. Rupp, in IEEE 73rd Vehicular Technology Conference (VTC-Spring), Budapest, Hungary, May 2011, best student paper award.
• Modeling time-variant fast fading statistics of mobile peer-to-peer radio channels
  M. Gan, N. Czink, P. Castiglione, C. Oestges, F. Tufvesson, and T. Zemen, in IEEE 73rd Vehicular Technology Conference (VTC-Spring), Budapest, Hungary, May 15-18, 2011.
• In-tunnel vehicular radio channel characterization
  L. Bernadó, A. Roma, T. Zemen, N. Czink, J. Karedal, A. Paier, A. Thiel, O. Klemp, F. Tufvesson, A. F. Molisch and C. F. Mecklenbräuker, in IEEE 73rd Vehicular Technology Conference (VTC-Spring), Budapest, Hungary, May 15-18, 2011.
• Energy-neutral source-channel coding in energy-harvesting wireless sensors
  P. Castiglione, O. Simeone, E. Erkip, and T. Zemen, in 9th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), Princeton, NJ, USA, May 9-13 2011.
• Cluster-based scattering identification and characterization in vehicular channels
  L. Bernadó, A. Roma, N. Czink, J. Karedal, A. Paier, and T. Zemen, in European Wireless 2011, Vienna, Austria, April 27-29, 2011, invited.

2010

• Complexity reduction for vehicular channel estimation using the filter-divergence measure
  L. Bernadó, T. Zemen, A. Paier, and K. Karedal, in 44th Asilomar Conference on Signals, Systems and Computers, Pacific Grove (CA), USA, Nov. 7-10, 2010.
• On the use of mismatched Wiener filtering for the characterization of non-stationary channels
  A. Ispas, L. Bernadó, M. Dörpinghaus, G. Ascheid, and T. Zemen, in 44th Asilomar Conference on Signals, Systems and Computers, Pacific Grove (CA), USA, Nov. 7-10, 2010.
• Multi-Dimensional K-Factor Analysis for V2V Radio Channels in Open Sub-urban Street Crossings
  L. Bernadó, T. Zemen, J. Karedal, A. Paier, A. Thiel, O. Klemp, N. Czink, F. Tufvesson, A. F. Molisch and C. F. Mecklenbräuker, in 21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Istanbul, Turkey, September 26-30, 2010.
• Temporal Evolution of Channel Capacity in Vehicular MIMO Channels in the 5 GHz Band
  A. Alonso, C. F. Mecklenbräuker, A. Paier, T. Zemen, N. Czink, F. Tufvesson, in XX URSI Commission B International Symposium on Electromagnetic Theory (EMT-S 2010), Berlin, Germany, August 16-19, 2010. [BIB]
• Physical Layer Simulation Results for IEEE 802.11p using Vehicular non-Stationary Channel Mode
  L. Bernadó, T. Zemen, N. Czink and P. Belanovic, temporary document TD(10)11029 presented at COST 2100 Meeting, Aalborg, Denmark, June 2-4, 2010.
• Impact of fading statistics on partner selection in indoor-to-outdoor cooperative networks
  P. Castiglione, S. Savazzi, M. Nicoli and T. Zemen, in IEEE International Conference on Communications (ICC), Cape Town, South Africa, May 23-27, 2010. [BIB]
• Physical layer simulation results for IEEE 802.11p using vehicular non-stationary channel model
  L. Bernadó, N. Czink, T. Zemen and P. Belanovic, in IEEE International Conference on Communications (ICC) Workshop on Vehicular Connectivity, Cape Town, South Africa, May 23-27, 2010.
• Capacity evaluation of measured vehicle-to-vehicle radio channels at 5.2 GHz
  A. Alonso, A. Paier, T. Zemen, N. Czink, and F. Tufvesson, in IEEE International Conference on Communications (ICC) Workshop on Vehicular Connectivity, Cape Town, South Africa, May 23-27, 2010.
• Low-complexity geometry-based modeling of diffuse scattering
  N. Czink, F. Kaltenberger, Y. Zhou, L. Bernadó, T. Zemen and X. Yin, in European Conference on Antennas and Propagation (EuCAP), Barcelona, Spain, April 12-16, 2010.
• IEEE 802.11p Transmission Using GNURadio
  P. Fuxjäger, A. Costantini, D. Valerio, P. Castiglione, T. Zemen, F. Ricciato, in 6th Karlsruhe Workshop on Software Radios (WSR10), Karlsruhe, Germany, March 3-4, 2010, to be presented. Also to be presented at 2010 European Reconfigurable Radio Technologies Workshop (ERRT), Mainz, Germany, June 23-25, 2010.
• Multi-dimensional K-factor analysis for V2V radio channels in open sub-urban street crossings
  L. Bernadó, T. Zemen, J. Karedal, A. Paier, A. Thiel, O. Klemp, N. Czink, F. Tufvesson, A. F. Molisch, C. F. Mecklenbräuker, temporary document TD(10)10015 presented at COST 2100 Meeting, Athens, Greece, Feb. 3-5, 2010.

2009

• Survey of Doppler-delay characteristics of diffuse components in vehicular propagation channels
  Y. Zhou, X. Yin, N. Czink, T. Zemen, F. Liu, in 2nd IEEE Conference on Wireless Access in Vehicular Environments (WAVE2009), Tongji University, Shanghai, China, December 21-22, 2009.
• Validation of minimum-energy band-limited prediction using vehicular channel measurements
  T. Zemen, S. Caban, N. Czink, and M. Rupp, temporary document TD(09)943 presented at COST 2100 Meeting, Vienna, Austria, September 28-30, 2009.
• Overview of vehicle-to-vehicle radio channel measurements for collision avoidance applications
  A. Paier, L. Bernadó, J. Karedal, O. Klemp, A. Kwoczek, F. Tufvesson, A. Thiel, Y. Zhou, N. Czink, T. Zemen, A. F. Molisch and C. F. Mecklenbräuker, temporary document TD(09)928 presented at COST 2100 Meeting, Vienna, Austria, September 28-30, 2009.
• Impact of fading statistics on partner selection in indoor-to-outdoor cooperative networks
  P. Castiglione, S. Savazzi, M. Nicoli, T. Zemen, temporary document TD(09)902 presented at COST 2100 Meeting, Vienna, Austria, September 28-30, 2009.
• Parametrization of the local scattering function estimator for vehicular-to-vehicular channels
  L. Bernadó, T. Zemen, A. Paier, J. Karedal, and B. H. Fleuyr, in IEEE 70th Vehicular Technology Conference (VTC2009-Fall), Anchorage, Alaska, 20–23 September 2009.
• Validation of minimum-energy band-limited prediction using vehicular channel measurements
  T. Zemen, S. Caban, N. Czink, and M. Rupp, in 17th European Signal Processing Conference (EUSIPCO), Glasgow, Scotland, 24-28 August 2009.
• Measurement-based modeling of vehicle-to-vehicle MIMO channels
  J. Karedal, F. Tufvesson, N. Czink, A. Paier, C. Dumard, T. Zemen, C.F. Mecklenbräuker and A. Molisch, in IEEE International Conference on Communications (ICC), Dresden, Germany, Jun. 14-18, 2009.
• Performance Degradation of a Mismatched Wiener Filter for non-WSSUS Processes
  L. Bernado, T. Zemen, A. Paie and J. Karedal, temporary document TD(09)858 presented at COST 2100 Meeting, Valencia, Spain, May 18-19, 2009.
• Parametrization of the local scattering function of the vehicular-to-vehicular channel using a 2D Wiener filter
  L. Bernado, T. Zemen, A. Paier, J. Karedal, and B. H. Fleuyr, in NEWCOM++ - ACoRN Joint Workshop, Barcelona, March 30-April 1, 2009.
• Performance Analysis of Coded Cooperation over Time-Variant Channels
  P. Castiglione, M. Nicoli, and T. Zemen, in NEWCOM++ - ACoRN Joint Workshop, Barcelona, March 30-April 1, 2009.
• Cooperative regions for coded cooperation over time-varying fading channels
  P. Castiglione, M. Nicoli, S. Savazzi and T. Zemen, in International ITG/IEEE Workshop on Smart Antennas (WSA 2009), Berlin, Germany, February 16-19, 2009.
• On the characterization of MU-MIMO channels
  F. Kaltenberger, L. Bernadó, and T. Zemen, in International ITG/IEEE Workshop on Smart Antennas (WSA 2009), Berlin, Germany, February 16-19, 2009.
• Spatial diversity and correlation coefficient evaluation of measured vehicle-to-vehicle radio channels at 5.2 GHz
  A. Paier, T. Zemen, C. F. Mecklenbräuker, J. Karedal, N. Czink, C. Dumard, F. Tufvesson, A. F. Molisch, in IEEE Signal Processing Society 13th DSP Workshop & 5th SPE Workshop (DPSSPE), Marco Island, Florida, USA, January 4-7, 2009, invited.

2008

• On the temporal evolution of signal subspaces in vehicular MIMO channels in the 5GHz band
  C. F. Mecklenbräuker, A. Paier, T. Zemen, G. Matz and A. F. Molisch, in Joint Workshop on Coding and Communications (JWCC 2008), Napa Valley, California, USA, Oct. 26-28, 2008, invited.
• Description of vehicle-to-vehicle and vehicle-to-infrastructure radio channel measurements at 5.2 GHz
  A. Paier, J. Karedal, T. Zemen, N. Czink, C. Dumard, F. Tufvesson, C.F. Mecklenbräuker and A. Molisch, temporary document TD(08)636 presented at COST 2100 Meeting, Lille, France, Oct. 6-8, 2008.
• Characterization of MU-MIMO channels using the spectral divergence measure
  F. Kaltenberger, L, Bernadó and T. Zemen, temporary document TD(08)640 presented at COST 2100 Meeting, Lille, France, Oct. 6-8, 2008.
• On the temporal evolution of signal subspaces in vehicular MIMO channels in the 5 GHz band
  C. F. Mecklenbräuker, A. Paier, T. Zemen, G. Matz and A. Molisch, temporary document TD(08)631 presented at COST 2100 Meeting, Lille, France, Oct. 6-8, 2008.
• Soft sphere decoder for an iterative receiver in time-varying MIMO channels
  C. Dumard, J. Jalden and T. Zemen, in 16th European Signal Processing Conference (EUSIPCO), Lausanne, Switzerland, Aug. 25-29, 2008, invited.
• Non-WSSUS vehicular channel characterization at 5.2 GHz - spectral divergence and time-variant coherence parameters
  L. Bernado, T. Zemen, A. Paier, G. Matz, J. Karedal, N. Czink, C. Dumard, F. Tufvesson, M. Hagenauer, A. F. Molisch, C. F. Mecklenbräuker, in XXIX General Assembly of the International Union of Radio Science (URSI), Chicago, Illinois, USA, August 7-16, 2008, invited.
• Measurement-based time-variant MIMO channel modelling using clusters
  N. Czink, E. Bonek, J. Ylitalo, T. Zemen, in XXIX General Assembly of the International Union of Radio Science (URSI), Chicago, Illinois, USA, August 7-16, 2008.
• UMTS on the road: Broadcasting intelligent road safety information via MBMS
  D. Valerio, F. Ricciato, P. Belanovic and T. Zemen, in 67th IEEE Vehicular Technology Conference (VTC2008-Spring), Marina Bay, Singapore, May 11–14, 2008.
• Non-WSSUS vehicular channel characterization in highway and urban scenarios at 5.2 GHz using the local scattering function
  A. Paier, T. Zemen, L. Bernado, G. Matz, J. Karedal, N. Czink, C. Dumard, F. Tufvesson, A. F. Molisch, and C. F. Mecklenbräuker, in Workshop on Smart Antennas (WSA), Darmstadt, Germany, Feb. 26-27, 2008. [BIB]
• Comparison of Lund'07 vehicular channel measurements with the IEEE 802.11p channel model
  A. Paier, J. Karedal, N. Czink, C. Dumard, T. Zemen, F. Tufvesson, C. Mecklenbräuker, and A.F. Molisch, temporary document TD(08)436 presented at COST 2100 Meeting, Wroclaw, Poland, Feb. 6-8, 2008.
• Measurement-based time-variant channel modelling using clusters
  N. Czink, E. Bonek, J. Ylitalo and T. Zemen, temporary document TD(08)435 presented at COST 2100 Meeting, Wroclaw, Poland, Feb. 6-8, 2008.

2007

• An entropy based model for system-level downlink capacity requirements in V2R telematic systems
  P. Belanovic and T. Zemen, in 2nd IEEE Workshop on Automotive Networking and Applications (AutoNet 2007), Washington, DC, USA, November 30, 2007.
• Cluster parameter for time-variant MIMO channel models
  N. Czink, R. Tian, S. Wyne, G. Eriksson, T. Zemen, J. Ylitalo, F. Tufvesson and A. F. Molisch, in European Conference on Antennas and Propagation (EuCAP), Edingburgh, United Kingdom, November 11-16, 2007.
• Car-to-car radio channel measurements at 5 GHz: Pathloss, power delay profile, and Doppler delay spectra
  A. Paier, J. Karedal, N. Czink, H. Hofstetter, C. Dumard, T. Zemen, F. Tufvesson, A. F. Molisch, C. F. Mecklenbräuker, in IEEE International Symposium on Wireless Communication Systems (ISWCS), Trondheim, Norway, October 17-19.
• Challenges in vehicular communications for impactive systems - Dynamics, Doppler, and delay
  C. Mecklenbräuker, A. Paier, J. Karedal, N. Czink, H. Hofstetter, C. Dumard, T. Zemen, F. Tufvesson, A. Molisch, presented at Joint Workshop on Coding and Communications (JWCC), Dürnstein, October, 2007. (invited)
• First results from car-to-car and car-to-infrastructure radio channel measurements at 5.2GHz
  A. Paier, J. Karedal, N. Czink, H. Hofstetter, C. Dumard, T. Zemen, F. Tufvesson, C. F. Mecklenbräuker, A. F. Molisch, temorary document TD(07)303 presented at COST 2100 Meeting, Duisburg, Germany, Sep. 10-12, 2007.
• Tracking time-variant cluster parameters in MIMO channel measurements: Algorithm and results
  N. Czink, R. Tian, S. Wyne, G. Eriksson, F. Tufvesson, T. Zemen, J. Nuutinen, J. Ylitalo, E. Bonek and A. F. Molisch, temporary document TD(07)336 presented at COST 2100 Meeting, Duisburg, Germany, Sep. 10-12, 2007.
• First results from car-to-car and car-to-infrastructure radio channel measurements at 5.2GHz
  A. Paier, J. Karedal, N. Czink, H. Hofstetter, C. Dumard, T. Zemen, F. Tufvesson, C. F. Mecklenbräuker, A. F. Molisch, in 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Athens, Greece, September 3-7, 2007.
• Subspace-based sphere decoder for MC-CDMA in time-varying MIMO channels
  C. Dumard and T. Zemen, in 18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Athens, Greece, Sept. 3-7, 2007.
• Sphere decoder for a MIMO multi-user MC-CDMA uplink in time-varying channels
  C. Dumard and T. Zemen, in IEEE International Conference on Communications (ICC), Glasgow, Scotland, United Kingdom, June 24-28, 2007.

2006

• Low-complexity channel emulation
  F. Kaltenberger, G. Steinböck, G. Humer and T. Zemen, in European Conference on Antennas and Propagation (EuCAP), Nice, France, November 6-10, 2006, invited.
• Principal component analysis of mobility data from an operational GPRS network
  C. Dumard, F. Ricciato and T. Zemen, in First International Conference on Communications and Networking in China (CHINACOM), Beijing, China, Oct. 25-27, 2006.
• Low-complexity joint data detection and channel estimation in time-varying flat-fading channels within the SAGE framework
  J. Wehinger, T. Zemen, A. Kocian and B. H. Fleury, in NEWCOM-ACORN Joint Workshop (NEWCOM-ACORN), Vienna, Austria, Sep. 20-22, 2006.
• Krylov subspace method based low-complexity MIMO multi-user receiver for time-variant channels
  C. Dumard and T. Zemen, in 17th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Helsinki, Finland, Sep. 11-14, 2006, best student paper award.
• Minimum-energy bandlimited time-variant channel prediction with dynamic subspace selection
  T. Zemen, C. Mecklenbräuker, B. H. Fleury, in 14th European Signal Processing Conference (EUSIPCO), Florence, Italy, Sep. 4-8, 2006, invited. Erratum.
• Estimators for time-variant channels applied to UMTS-HSDPA
  J. Wehinger, T. Zemen and K. Freudenthaler, in IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Cannes, France, July 2-5, 2006.
• Time-variant channel prediction using time-concentrated and band-limited sequences
  T. Zemen, C. F. Mecklenbräuker and B. H. Fleury, in IEEE International Conference on Communications (ICC), Istanbul, Turkey, June 11-15, 2006. [BIB]
• Low-Complexity Doubly Selective Channel Simulation Using Multidimensional Discrete Prolate Spheroidal Sequences
  F. Kaltenberger, T. Zemen and C. Ueberhuber, in 15th IST Mobile and Wireless Communication Summit (IST SUMMIT), Myconos, Greece, June 4-8, 2006.
• Integration of the Krylov subspace method in an iterative multi-user detector for time-variant channels
  C. Dumard and T. Zemen, in IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), vol. IV,Toulouse, France, May 14-19, 2006, pp. 789-792.
• Time-variant channel prediction using time-concentrated and band-limited sequences - analytic results
  T. Zemen, C. Mecklenbräuker and B. H. Fleury, in 5th Vienna Symposium in Mathematical Modelling (MATHMOD), Vienna, Austria, Feb. 2006, invited.
• Low complexity time-variant flat-fading channel simulation using discrete prolate spheroidal sequences
  F. Kaltenberger, T. Zemen and C. Ueberhuber, in 5th Vienna Symposium in Mathematical Modelling (MATHMOD), Vienna, Austria, Feb. 2006, invited.

2005

• Successive Slepian subspace projection in time and frequency for time-variant channel estimation
  T. Zemen, H. Hofstetter and G. Steinböck, in 14th IST Mobile and Wireless Communication Summit (IST SUMMIT), Dresden, Germany, June 19-22, 2005.
• Double Krylov subspace approximation for low complexity iterative multi-user decoding and time-variant channel estimation
  C. Dumard and T. Zemen, in Sixth IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), New York, USA, June 5- 8, 2005, pp. 346-350.
• Krylov approximation for multi-user detection with parallel interference cancellation in chip and user space
  C. Dumard and T. Zemen, in Winterschool on Coding and Information Theory, Bratislava, Slovakia, February 20-25, 2005.

2004

• Iterative multi-user decoding with time-variant channel estimation for MC-CDMA
  T. Zemen, C. F. Mecklenbräuker, J. Wehinger and R. R. Müller, in Fifth International Conference on 3G Mobile Communications Technologies (3G2004), London, United Kingdom, October 18-20, 2004, pp. 88-92, invited paper. [BIB]
• Subspace projection in the time and frequency domain for time-variant multi-user MIMO OFDM channel estimation
  T. Zemen, H. Hofstetter, G. Steinböck, temporary document TD(04)203 presented at COST 273 Meeting, Duisburg, Germany, Sep. 20-22, 2004.
• Iterative MIMO multi-user detection: Performance evaluation with COST 259 channel model
  H. Hofstetter, T. Zemen, J. Wehinger and G. Steinböck, in Seventh International Symposium on Wireless Personal Multimedia Communications (WPMC), Abano Terme, Italy, Sep. 12-15, 2004, invited paper.
• Doppler diversity in MC-CDMA using the slepian basis expansion model
  T. Zemen and C. F. Mecklenbräuker, in 12th European Signal Processing Conference (EUSIPCO), Vienna, Austria, Sep. 7-10, 2004. [BIB]
• On channel estimators for iterative CDMA multiuser receivers in flat Rayleigh fading
  J. Wehinger, C. F. Mecklenbräuker, R. R. Müller, T. Zemen and M. Loncar, in IEEE International Conference on Communications (ICC), Paris, France, June 2004.

2003

• Improved channel estimation for iterative receivers
  T. Zemen, M. Loncar, J. Wehinger, C. F. Mecklenbräuker and Ralf R. Müller, in IEEE Global Communications Conference (GLOBECOM), vol. 1, San Francisco (CA), USA, Dec. 1-5, 2003, pp. 257-261.
• Time-variant channel equalization via discrete prolate spheroidal sequences
  T. Zemen and C. F. Mecklenbräuker, in 37th Asilomar Conference on Signals, Systems, and Computers, Pacific Grove (CA), USA, Nov. 9-12, 2003, invited paper. [BIB]
• Time variant channel equalization for MC-CDMA via Fourier basis functions
  T. Zemen, C. F. Mecklenbräuker and Ralf R. Müller, in MC-SS Workshop 2003, Oberpaffenhofen, Germany, Sep. 17-19, 2003, pp. 451-458.
• Iterative detection and channel estimation for MC-CDMA
  T. Zemen, J. Wehinger, C. F. Mecklenbräuker and Ralf R. Müller, in IEEE International Conference on Communications (ICC), vol.5, Anchorage (Alaska), May 2003, pp. 3462-3466.

1998

• Classification of sleep apnea events by means of radial basis function networks
  T. Zemen, M. Clabian, H. Pfützner, in ISCS Neural Computation, NC'98, Austria, Vienna, Sept. 1998.

Patent

• Channel Estimation in an OFDM Transmission System
  N. Czink, T. Zemen, L. Bernadó, A. Molisch

Theses

• OFDM multi-user communication over time-variant channels
  T. Zemen, Doctoral Thesis. Vienna University of Technology, Vienna, Austria, 2004.
• Classification of sleep apnea events by means of neural networks
  T. Zemen, Diploma Thesis. Vienna University of Technology, Vienna, Austria, 1998.

(Co-) Supervision of Master Thesis at ftw.

• T. An, Master thesis, Feasibility Study of Interference Alignment in Time-Variant and Frequency-Selective Channels, Lund University, Lund, Sweden, 2011, jointly with R. Tresch and F. Tufvesson, in progress.
• P. Castiglione, Cooperative communications over time-variant channels, Master Thesis, Politecnico di Milano, Milano, Italy, 2007, jointly with M. Nicoli.
• H. Somasegaran, Channel Estimation and Prediction in UMTS LTE, Master Thesis, Aalborg University, Aalborg, Denmark, 2006, jointly with B. H. Fleury.

(Co-) Supervision of Doctoral Thesis at ftw.

• P. Castiglione, Doctoral Thesis in progress, Vienna University of Technology, Vienna, Austria, jointly with G. Matz and M. Nicoli.
• L. Bernado, Non-Stationarity in Vehicular Wireless Channels, Doctoral Thesis, Vienna University of Technology, Vienna, Austria, 2012, jointly with C. Mecklenbräuker.
• R. Tresch, Node Coordination and Cooperation in Multiuser Wireless Communications, Doctoral Thesis, Vienna Universtiy of Technology, Vienna, Austria, 2011, jointly with M. Guillaud and G. Matz.
• C. Dumard, Low-Complexity Receivers for a Multi-User OFDM System in Time-Varying MIMO Channels, Doctrol Thesis, Vienna University of Technology, Vienna, Austria, 2009, jointly with G. Matz.
• F. Kaltenberger, Low-Complexity Real-Time Signal Processing for Wireless Communications, Doctoral Thesis, Vienna University of Technology, Vienna, Austria, 2007, jointly with C. Überhuber.
• N. Czink, The Random-Cluster Model — A Stochastic MIMO Channel Model for Broadband Communication Systems of the 3rd Generation and Beyond, Doctoral Thesis, Vienna University of Technoloy, Vienna, Austria 2007, jointly with E. Bonek.

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