Signal Processing and Speech Communication Laboratory
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Klaus Witrisal

Room number
IDEG018
Telephone number
  • office: +43 (316) 873 - 4431
Position
Associate Professor
Email
witrisal@tugraz.at
Research interests

signal processing for broadband and UWB wireless communications, propagation channel modeling, and positioning

Klaus Witrisal received the Dipl.-Ing. degree in electrical engineering from Graz University of Technology in 1997, the Ph.D. degree (cum laude) from Delft University of Technology, The Netherlands, in 2002, and the Venia Docendi (Habilitation) from Graz University of Technology in 2009 in “Wireless Communications”. From 1997 till 2001, he was a Research Engineer at Delft University of Technology, where he was key researcher in a collaborative research project with Korea Telecom in the field of OFDM air-interface design. This research was the basis for his Ph.D. thesis. From Jan.–Oct. 2002, he was a Project Leader with AVL in Graz, Austria, working on advanced diagnostics tools for the automotive industries. Since Nov. 2002, Dr. Witrisal is with the Signal Processing and Speech Communication Laboratory (SPSC) of Graz University of Technology, where he runs a number of research projects in the area of ultra-wideband (UWB) communications and positioning. He has been involved as a project leader for TU Graz in the sixth-framework project EUROPCOM, which has successfully demonstrated a UWB based ad-hoc network for emergency personal, providing indoor localization at high-accuracy. He has been supervising several Ph.D. projects, with funding from various sources, the Christian Doppler Gesellschaft, Österreichische Forschungsförderungs Gesellschaft (FFG) (within the program lines Bridge and FIT-IT), Land Steiermark, and Österreichischer Austauschdienst (ÖAD). He finalized his Habilitation Thesis on Noncoherent UWB Transceivers in 2008, whose introduction has been published in the IEEE Signal Processing Magazine in July 2009. Dr. Witrisal and his students have received best paper awards at international conferences (IEEE Intern. Symp. on Personal, Indoor, and Mobile Radio Communications (PIMRC) in 1998 and IEEE International Conference on UWB Systems (ICU) in 2005), the GIT award for a graduation thesis (for Christoph Steiner in 2004), and a nomination for the KIvI Telecom Award in the Netherlands, in 1999.


Research Programs
Research Topics
Research Projects
Courses
Student Projects
PhD Theses
Publications
  • Article Leitinger E., Meyer F., Hlawatsch F., Witrisal K., Tufvesson F. & Win M. (2019) A Belief Propagation Algorithm for Multipath-Based SLAM. in IEEE transactions on wireless communications, 18(11). [more info] [doi]
  • Article Bakr M., Großwindhager B., Rath M., Kulmer J., Hunter I., Abd-Alhameed R., Witrisal K., Boano C., Römer K. & Bösch W. (2019) Compact broadband frequency selective microstrip antenna and its application to indoor positioning systems for wireless networks. in IET microwaves, antennas & propagation, 13(8). [more info]
  • Article Kulmer J., Grebien S., Leitinger E. & Witrisal K. (2019) Delay Estimation in Presence of Dense Multipath. in IEEE wireless communications letters. [more info] [doi]
  • Conference contribution Leitinger E., Grebien S. & Witrisal K. (2019) Multipath-based SLAM Exploiting AoA and Amplitude Information. in 2019 IEEE International Conference on Communications Workshops (ICC Workshops). [more info]
  • Conference contribution Wilding T., Grebien S., Leitinger E., Mühlmann U. & Witrisal K. (2018) Single-Anchor, Multipath-Assisted Indoor Positioning with Aliased Antenna Arrays. in 2018 Asilomar Conference on Signals, Systems and Computers (pp. 525-531). [more info] [doi]
  • Conference contribution Toth M., Meissner P., Melzer A. & Witrisal K. (2018) Analytical Investigation of Non-Coherent Mutual FMCW Radar Interference. in 2018 15th European Radar Conference, EuRAD 2018 (pp. 71-74). [more info] [doi]
  • Conference contribution Kulmer J., Wen F., Garcia N., Wymeersch H. & Witrisal K. (2018) Impact of Rough Surface Scattering on Stochastic Multipath Component Models. in 2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2018 (pp. 1410-1416). [more info] [doi]
  • Conference contribution Kulmer J., Grebien S., Rath M. & Witrisal K. (2018) On the unimportance of phase-coherent measurements for beampattern-assisted positioning. in 2018 IEEE Wireless Communications and Networking Conference, WCNC 2018 (pp. 1-6). [more info] [doi]
  • Article Pedross-Engel A., Schumacher H. & Witrisal K. (2018) Modeling and Identification of Ultra-Wideband Analog Multipliers. in IEEE Transactions on Circuits and Systems I: Regular Papers, 65(1), p. 283-292. [more info] [doi]
  • Article Wilding T., Grebien S., Mühlmann U. & Witrisal K. (2018) Accuracy Bounds for Array-Based Positioning in Dense Multipath Channels. in Sensors , 18(12). [more info] [doi]
  • Article Kulmer J., Leitinger E., Grebien S. & Witrisal K. (2018) Anchorless Cooperative Tracking Using Multipath Channel Information. in IEEE transactions on wireless communications, 17(4), p. 2262-2275. [more info] [doi]
  • Article Leitinger E., Meyer F., Hlawatsch F., Witrisal K., Tufvesson F. & Win M. (2018) A Belief Propagation Algorithm for Multipath-Based SLAM. in arXiv.org e-Print archive. [more info]
  • Conference contribution Leitinger E., Grebien S., Li X., Tufvesson F. & Witrisal K. (2018) On the Use of MPC Amplitude Information in Radio Signal Based SLAM. in Proc. IEEE SSP-18 (pp. 633-637). [more info] [doi]
  • Conference contribution Hong A., Rath M., Kulmer J., Grebien S., Van K. & Witrisal K. (2018) Gaussian Process modeling of UWB multipath components. in 2018 IEEE Seventh International Conference on Communications and Electronics (ICCE) (pp. 291-296). [more info] [doi]
  • Conference contribution Großwindhager B., Rath M., Kulmer J., Bakr M., Boano C., Witrisal K. & Römer K. (2018) SALMA: UWB-based Single-Anchor Localization System Using Multipath Assistance. in SALMA: UWB-based Single-Anchor Localization System using Multipath Assistance (pp. 132-144). [more info]
  • Conference contribution Großwindhager B., Rath M., Kulmer J., Bakr M., Boano C., Witrisal K. & Römer K. (2018) Dataset: Single-Anchor Indoor Localization with Decawave DW1000 and Directional Antennas. in Dataset: Single-Anchor Indoor Localization with Decawave DW1000 and Directional Antennas (pp. 21-22). [more info]
  • Conference contribution Wilding T., Grebien S., Mühlmann U. & Witrisal K. (2018) AoA and ToA Accuracy for Antenna Arrays in Dense Multipath Channels. in 2018 8th International Conference on Localization and GNSS (ICL-GNSS) (pp. 1-6). [more info]
  • Conference contribution Leitinger E., Meyer F., Tufvesson F. & Witrisal K. (2017) Factor graph based simultaneous localization and mapping using multipath channel information. in 2017 IEEE International Conference on Communications Workshops, ICC Workshops 2017 (pp. 652-658). [more info] [doi]
  • Article Galler F., Grebien S., Faseth T., Witrisal K., Magerl G. & Arthaber H. (2017) Extension of an SDR UHF RFID Testbed for MIMO and Monostatic Time of Flight Based Ranging. in IEEE Journal of Radio Frequency Identification, PP(99), p. 1-1. [more info] [doi]
  • Article Grebien S., Kulmer J., Galler F., Goller M., Leitinger E., Arthaber H. & Witrisal K. (2017) Range Estimation and Performance Limits for UHF-RFID Backscatter Channels. in IEEE Journal of Radio Frequency Identification, PP(99), p. 1-1. [more info] [doi]
  • Paper Grebien S., Leitinger E. & Witrisal K. (2017) Bayesian Multipath Channel Estimation Considering Dense Multipath.. [more info]
  • Conference contribution Galler F., Grebien S., Faseth T., Leder N., Witrisal K., Magerl G. & Arthaber H. (2017) Performance Evaluation and Verification of Spread-Spectrum Based UHF RFID Ranging. in 2017 IEEE International Conference on RFID (pp. 124-129). [more info] [doi]
  • Conference contribution Grebien S., Kulmer J., Goller M., Galler F., Arthaber H. & Witrisal K. (2017) UHF-RFID Backscatter Channel Analysis for Accurate Wideband Ranging. in 2017 IEEE Int. Conf. RFID (pp. 117-123). [more info] [doi]
  • Conference contribution Rath M., Kulmer J., Bakr M., Großwindhager B. & Witrisal K. (2017) Multipath-assisted indoor positioning enabled by directional UWB sector antennas. in 2017 IEEE 18th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) (pp. 1-5). [more info] [doi]
  • Conference contribution Kulmer J., Grebien S., Großwindhager B., Rath M., Bakr M., Leitinger E. & Witrisal K. (2017) Using DecaWave UWB transceivers for high-accuracy multipath-assisted indoor positioning. in 2017 IEEE International Conference on Communications Workshops (ICC Workshops) (pp. 1239-1245). [more info] [doi]
  • Conference contribution Großwindhager B., Rath M., Kulmer J., Grebien S., Bakr M., Boano C., Witrisal K. & Römer K. (2017) Demo Abstract: UWB-based Single-anchor Low-cost Indoor Localization System. in Demo Abstract: UWB-based Single-anchor Low-cost Indoor Localization System. [more info]
  • Conference contribution Großwindhager B., Bakr M., Rath M., Gentili F., Bösch W., Witrisal K., Boano C. & Römer K. (2017) Poster Abstract: Switchable Directional Antenna System for UWB-based Internet of Things Applications. in Poster Abstract: Switchable Directional Antenna System for UWB-based Internet of Things Applications. [more info]
  • Article Steinböck G., Gan M., Meissner P., Leitinger E., Witrisal K., Zemen T. & Pedersen T. (2016) Hybrid Model for Reverberant Indoor Radio Channels Using Rays and Graphs. in IEEE transactions on antennas and propagation, 64(9), p. 4036-4048. [more info] [doi]
  • Conference contribution Grebien S., Leitinger E., Meissner P., Kulmer J. & Witrisal K. (2016) Bandwidth dependence of the ranging error variance in dense multipath. in 2016 24th European Signal Processing Conference (EUSIPCO) (pp. 733-737). [more info] [doi]
  • Conference contribution Nguyen A., Rath M., Leitinger E., Grebien S. & Witrisal K. (2016) Channel Capacity Analysis of Indoor Environments for Location-aware Communications. in 2016 IEEE Global Communications Conference: Second IEEE International Workshop on Localization and Tracking: Indoors, Outdoors, and Emerging Networks (GC16 Workshops LION). [more info]
  • Conference contribution Kulmer J., Leitinger E., Meissner P., Grebien S. & Witrisal K. (2016) Cooperative Localization and Tracking using Multipath Channel Information. in Localization and GNSS (ICL-GNSS), 2016 International Conference on. [more info]
  • Article Boano C., Römer K., Bloem R., Witrisal K., Baunach M. & Horn M. (2016) Dependability for the Internet of Things. in e&i - Elektrotechnik und Informationstechnik, 133(7), p. 304–309. [more info] [doi]
  • Conference contribution Grebien S., Leitinger E., Meissner P., Kulmer J. & Witrisal K. (2016) Bandwidth Dependence of the Ranging Error Variance in Dense Multipath. in COST Action CA15104 2nd Technical Meeting. [more info]
  • Conference contribution Grebien S., Leitinger E., Meissner P. & Witrisal K. (2016) MIMO Gain and Bandwidth Scaling for RFID Positioning in Dense Multipath Channels. in COST Action CA15104 2nd Technical Meeting. [more info]
  • Conference contribution Witrisal K., Grebien S., Kulmer J., Leitinger E. & Meissner P. (2016) High-accuracy positioning for indoor applications: RFID, UWB, 5G, and beyond. in 2016 IEEE International Conference on RFID (RFID) (pp. 1-7). [more info] [doi]
  • Article Witrisal K., Leitinger E., Grebien S. & Meissner P. (2016) Bandwidth Scaling and Diversity Gain for Ranging and Positioning in Dense Multipath Channels. in IEEE wireless communications letters, PP(99). [more info] [doi]
  • Conference contribution Grebien S., Leitinger E., Meissner P. & Witrisal K. (2016) MIMO gain and bandwidth scaling for RFID positioning in dense multipath channels. in 2016 IEEE International Conference on RFID (RFID) (pp. 1-6). [more info] [doi]
  • Conference contribution Leitinger E., Meissner P., Witrisal K., Hlawatsch F. & Meyer F. (2016) Belief Propagation based Joint Probabilistic Data Association for Multipath-Assisted Indoor Navigation and Tracking. in Localization and GNSS (ICL-GNSS), 2016 International Conference on. [more info]
  • Article Witrisal K., Meissner P., Leitinger E., Shen Y., Gustafson C., Tufvesson F., Haneda K., Dardari D., Molisch A., Conti A. & Win M. (2016) High-Accuracy Localization for Assisted Living. in IEEE signal processing magazine, p. 59. [more info] [doi]
  • Conference contribution Leitinger E., Meissner P., Lafer M. & Witrisal K. (2015) Simultaneous Localization and Mapping using Multipath Channel Information. in IEEE ICC 2014 Workshop on Advances in Network Localization and Navigation (ANLN) (pp. 754-760). [more info]
  • Conference contribution Leitinger E., Meissner P., Lafer M. & Witrisal K. (2015) Multipath-assisted Indoor Simultaneous Localization and Mapping. in COST Action IC1004 Management Committee Meeting (pp. 1-1). [more info]
  • Conference contribution Dumphart G., Leitinger E., Meissner P. & Witrisal K. (2015) Monostatic Indoor Localization: Bounds and Limits. in IEEE ICC 2014 Workshop on Advances in Network Localization and Navigation (ANLN) (pp. 865-870). [more info]
  • Conference contribution Steinböck G., Gan M., Meissner P., Leitinger E., Witrisal K., Zemen T. & Pedersen T. (2015) Hybrid Model for Reverberant Indoor Radio Channels using Rays and Graphs. in COST Action IC1004 Management Committee Meeting (pp. 1-1). [more info]
  • Conference contribution Meissner P., Leitinger E. & Witrisal K. (2015) Robust and Accurate Indoor Localization using Channel Information. in COST Action IC1004 Management Committee Meeting (pp. 1-1). [more info]
  • Conference contribution Kulmer J., Leitinger E., Meissner P. & Witrisal K. (2015) Cooperative Multipath-assisted Navigation and Tracking: A Low-Complexity Approach. in EAI International Conference on Future access enablers of ubiquitous and intelligent infrastructures (pp. 1-7). [more info]
  • Conference contribution Kmiecik J., Meissner P., Leitinger E., Witrisal K. & Kulakowski P. (2015) Experimental Validation of Passive Indoor Localization and Tracking Using UWB Systems. in COST Action IC1004 Management Committee Meeting (pp. 1-1). [more info]
  • Article Leitinger E., Meissner P., Rüdisser C., Dumphart G. & Witrisal K. (2015) Evaluation of Position-related Information in Multipath Components for Indoor Positioning. in IEEE journal on selected areas in communications, p. 2313-2328. [more info] [doi]
  • Conference contribution Leitinger E., Froehle M., Meissner P. & Witrisal K. (2014) Multipath-Assisted Maximum-Likelihood Indoor Positioning using UWB Signals. in COST Action IC1004 Management Committee Meeting (pp. 1-1). [more info]
  • Conference contribution Gan M., Meissner P., Mani F., Leitinger E., Froehle M., Oestges C., Witrisal K. & Zemen T. (2014) Low-Complexity Sub-band Divided Ray Tracing for UWB Indoor Channels. in IEEE Wireless Communications and Networking Conference. [more info]
  • Conference contribution Meissner P., Leitinger E., Lafer M. & Witrisal K. (2014) Real-Time Demonstration of Multipath-Assisted Indoor Navigation and Tracking (MINT). in COST Action IC1004 Management Committee Meeting (pp. 1-1). [more info]
  • Conference contribution Leitinger E., Froehle M., Meissner P. & Witrisal K. (2014) Multipath-Assisted Maximum-Likelihood Indoor Positioning using UWB Signals. in IEEE ICC 2014 Workshop on Advances in Network Localization and Navigation (ANLN). [more info]
  • Conference contribution Meissner P., Leitinger E., Lafer M. & Witrisal K. (2014) Real-Time Demonstration of Multipath-Assisted Indoor Navigation and Tracking (MINT). in IEEE ICC 2014 Workshop on Advances in Network Localization and Navigation (ANLN). [more info]
  • Conference contribution Steinboeck G., Gan M., Meissner P., Leitinger E., Zemen T., Witrisal K. & Pedersen T. (2014) Preliminary Hybrid Model For Reverberant Indoor Radio Channels. in COST Action IC1004 Management Committee Meeting (pp. 1-1). [more info]
  • Conference contribution Gan M., Meissner P., Mani F., Leitinger E., Froehle M., Oestges C., Witrisal K. & Zemen T. (2014) Calibration of Indoor UWB Sub-band Divided Ray Tracing Using Multiobjective Simulated Annealing. in IEEE International Conference on Communications. [more info]
  • Conference contribution Leitinger E., Meissner P., Froehle M. & Witrisal K. (2014) Performance Bounds for Multipath-assisted Indoor Localization on Backscatter Channels. in IEEE Radar Conference. [more info]
  • Conference contribution Leitinger E., Fröhle M., Meissner P. & Witrisal K. (2014) Multipath-Assisted Maximum-Likelihood Indoor Positioning using UWB Signals. in Communications Workshops (ICC), 2014 IEEE International Conference on (pp. 170-175). [more info] [doi]
  • Article Meissner P., Leitinger E. & Witrisal K. (2014) UWB for Robust Indoor Tracking: Weighting of Multipath Components for Efficient Estimation. in IEEE wireless communications letters, 3(5), p. 501-504. [more info] [doi]
  • (Old data) Lecture or Presentation Pedroß A. & Witrisal K. (2013) Modeling and Identification of Nonideal Ultra-Wideband Multiplication Devices.. [more info]
  • Conference contribution Fröhle M., Leitinger E., Meissner P. & Witrisal K. (2013) Cooperative Multipath-Assisted Indoor Navigation and Tracking (Co-MINT) Using UWB Signals. in IEEE ICC 2013 Workshop on Advances in Network Localization and Navigation (ANLN). [more info]
  • Conference contribution Witrisal K., Leitinger E., Meissner P. & Arnitz D. (2013) Cognitive Radar for the Localizaiton of RFID Transponders in Dense Multipath Environments. in COST IC1004 Management and SCientific Meeting (pp. 1-6). [more info]
  • Conference contribution Witrisal K., Leitinger E., Meissner P. & Arnitz D. (2013) Cognitive Radar for the Localizaiton of RFID Transponders in Dense Multipath Environments. in IEEE Radar Conference (pp. 1-6). [more info]
  • Conference contribution Meissner P., Gan M., Mani F., Leitinger E., Fröhle M., Oestges C., Zemen T. & Witrisal K. (2013) On the Use of Ray Tracing for Performance Prediction of UWB Indoor Localization Systems. in ICC 2013 Workshop on Advances in Network Localization and Navigation (ANLN). [more info]
  • Conference contribution Meissner P., Leitinger E., Fröhle M. & Witrisal K. (2013) Accurate and Robust Indoor Localization Systems Using Ultra-wideband Signals. in European Navigation Conference. [more info]
  • Other report Aichhorn K., Kuci D., Sommer C., Fösleitner C., Koglbauer I., Hafner P., Moder T., Wieser M., Valeskini S., Bernoulli T., Walder U., Witrisal K. & Krajnz H. (2013) LOBSTER Final Report.. [more info]
  • Conference contribution Pedroß A. & Witrisal K. (2012) Analysis of Nonideal Multipliers for Multichannel Autocorrelation UWB Receivers. in IEEE International Conference on Ultra-Wideband (pp. 140-144). [more info] [doi]
  • Conference contribution Tauch M., Witrisal K., Kudlaty K., Noehammer S. & Wiesinger M. (2012) System Identification Method for Ultrasonic Intake Air Flow Meter for Engine Test Bed Applications. in IEEE Instrumentation and Measurement Technology Conference (pp. 1-5). [more info]
  • Conference contribution Fröhle M., Meissner P. & Witrisal K. (2012) Tracking of UWB Multipath Components Using Probability Hypothesis Density Filters. in COST IC1004 Management and Scientific Meeting (pp. 1-5). [more info]
  • Conference contribution Velde S., Wymeersch H., Meissner P., Witrisal K. & Steendam H. (2012) Cooperative Multipath-Aided Indoor Localization. in IEEE Wireless Communications and Networking Conference (pp. 3107-3111). [more info]
  • Conference contribution Meissner P. & Witrisal K. (2012) Analysis of Position-Related Information in Measured UWB Indoor Channels. in European Conference on Antennas and Propagation (pp. 6-10). [more info]
  • Conference contribution Meissner P. & Witrisal K. (2012) Multipath-Assisted Single-Anchor Indoor Localization in an Office Environment. in International Conference on Systems, Signals and Image Processing (pp. 22-25). [more info]
  • Conference contribution Meissner P. & Witrisal K. (2012) Analysis of Position-Related Information in Measured UWB Indoor Channels. in COST IC1004 Management and Scientific Meeting (pp. 1-5). [more info]
  • Conference contribution Fröhle M., Meissner P. & Witrisal K. (2012) Tracking of UWB Multipath Components Using Probability Hypothesis Density Filters. in Ultra-Wideband (ICUWB), 2012 IEEE International Conference on (pp. 306-310). [more info] [doi]
  • Conference contribution Pedroß A. & Witrisal K. (2012) Sliding Window Integrator Approximations for Multichannel Autocorrelation UWB Receivers. in IEEE International Symposium on Circuits and Systems (pp. 2537-2540). [more info] [doi]
  • Conference contribution Witrisal K. & Meissner P. (2012) Performance bounds for multipath-assisted indoor navigation and tracking (MINT). in IEEE International Conference on Communications (pp. 4321-4325). [more info]
  • Conference contribution Leitinger E., Geiger B. & Witrisal K. (2012) Capacity and capacity-achieving input distribution of the energy detector. in Proc. of the International Conference on Ultra-Wideband (pp. 57-61). [more info] [doi]
  • Article Gigl T., Troesch F., Preishuber-Pfluegl J. & Witrisal K. (2012) An Analysis of Coherent and Non-Coherent Receivers for Ranging in IEEE 802.15.4a. in Journal of electrical and computer engineering, p. 1-9. [more info] [doi]
  • Article Arnitz D., Muehlmann U. & Witrisal K. (2012) Wideband Characterization of Backscatter Channels: Derivations and Theoretical Background. in IEEE transactions on antennas and propagation, 60(1), p. 257-266. [more info] [doi]
  • Chapter Witrisal K. (2012) UWB Channel Sounding. Springer, 1 ed.. [more info]
  • Article Povalac A., Witrisal K. & Sebesta J. (2012) Degenerate RFID Channel Modeling for Positioning Applications. in Radioengineering, p. 1-8. [more info]
  • Chapter Witrisal K. & Fuegen T. (2012) UWB Signal Propagation and Channel. Springer, 1 ed.. [more info]
  • Article Arnitz D., Muehlmann U. & Witrisal K. (2012) Ultra-Wideband Characterization and Modeling of UHF RFID Channels for Ranging and Positioning. in IEEE transactions on antennas and propagation, 60(5), p. 2491-2501. [more info]
  • (Old data) Lecture or Presentation Meissner P. & Witrisal K. (2011) Tracking Algorithms for Multipath-Aided Indoor Localization.. [more info]
  • (Old data) Lecture or Presentation Arnitz D., Mühlmann U. & Witrisal K. (2011) Tag Localization in Passive UHF RFID.. [more info]
  • Conference contribution Witrisal K. & Meissner P. (2011) Performance Bounds for Multipath-aided Indoor Navigation and Tracking (MINT). in COST IC1004 Management and Scientific Meeting (pp. n-a). [more info]
  • Conference contribution Meissner P., Arnitz D., Gigl T. & Witrisal K. (2011) Analysis of an Indoor UWB Channel for Multipath-Aided Localization. in IEEE International Conference on Ultra-Wideband (pp. 565-569). [more info]
  • Conference contribution Kail G., Witrisal K. & Hlawatsch F. (2011) Direction-Resolved Estimation of Multipath Parameters for UWB Channels: A Partially Collapsed Gibbs Sampler Method. in IEEE International Conference on Acoustics, Speech, and Signal Processing (pp. 3484-3487). [more info] [doi]
  • Conference contribution Arnitz D., Mühlmann U. & Witrisal K. (2011) Wideband Characterization of Backscatter Channels. in European Wireless Conference (pp. 205-211). [more info]
  • Conference contribution Witrisal K. & Pausini M. (2011) Characterization of Inter-Pulse Interference and Fading for Ultra-Wideband Systems. in European Conference on Antennas and Propagation (pp. 3099-3103). [more info]
  • Conference contribution Meissner P., Arnitz D., Gigl T. & Witrisal K. (2011) Indoor UWB Channel Analysis in an Atrium-Style Office Building for Multipath-Aided Localization. in COST Action IC1004 Scientific Meeting (pp. 1-1). [more info]
  • Conference contribution Li G., Arnitz D., Ebelt R., Mühlmann U., Witrisal K. & Vossiek M. (2011) Bandwidth dependence of CW ranging to UHF RFID tags in severe multipath environments. in IEEE International Conference on RFID (pp. 19-25). [more info]
  • Conference contribution Fröhle M., Meissner P., Gigl T. & Witrisal K. (2011) Scatterer and Virtual Source Detection for Indoor UWB Channels. in Ultra-Wideband (ICUWB), 2011 IEEE International Conference on (pp. 16-20). [more info] [doi]
  • Website / Web publication Arnitz D., Mühlmann U. & Witrisal K. (2010) The PARIS Simulation Framework.. [more info]
  • (Old data) Lecture or Presentation Meissner P. & Witrisal K. (2010) Virtual Anchor based Localization using Ultra-wideband Radio Signals (VALOUR).. [more info]
  • (Old data) Lecture or Presentation Arnitz D., Mühlmann U. & Witrisal K. (2010) Ultra-Wideband Characterization of UHF RFID Channels for Ranging and Positioning.. [more info]
  • (Old data) Lecture or Presentation Geiger B., Gigl T. & Witrisal K. (2010) Enhanced-Accuracy Channel Estimation and Ranging Using IR-UWB Energy Detectors.. [more info]
  • (Old data) Lecture or Presentation Gigl T., Meissner P., Preishuber-Pfluegl J. & Witrisal K. (2010) An Analysis of Tracking with IEEE802.15.4a Using Ultra-Wideband Simulator for Positioning and Tracking (U-SPOT).. [more info]
  • Conference contribution Hausmair K., Witrisal K., Meissner P., Steiner C. & Kail G. (2010) SAGE Algorithm for UWB Channel Parameter Estimation. in COST 2100 Management Committee Meeting (pp. n-a). [more info]
  • Conference contribution Geiger B., Gigl T. & Witrisal K. (2010) Enhanced-Accuracy Channel Estimation and Ranging for IR-UWB Energy Detectors. in IEEE International Conference on Ultra-Wideband (pp. 513-518). [more info]
  • Conference contribution Lampe L. & Witrisal K. (2010) Challenges and Recent Advances in IR-UWBSystem Design. in Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on (pp. 3288-3291). [more info] [doi]
  • Conference contribution Prainsack J. & Witrisal K. (2010) Optimum Receiver Based on Single Bit Quantization. in The Eleventh IEEE International Workshop on Signal Processing Advances in Wireless Communications (pp. 1-4). [more info]
  • Conference contribution Gigl T., Troesch F., Preishuber-Pfluegl J. & Witrisal K. (2010) Maximal Operating Distance Estimation using IEEE 802.15.4a Ultra Wideband. in Workshop on Positioning, Navigation and Communication (WPNC) 2010 (pp. 10-18). [more info] [doi]
  • Conference contribution Meissner P. & Witrisal K. (2010) Analysis of a Noncoherent UWB Receiver for Multichannel Signals. in IEEE Vehicular Technology Conference (pp. 1-5). [more info]
  • Conference contribution Meissner P., Gigl T. & Witrisal K. (2010) UWB Sequential Monte Carlo Positioning using Virtual Anchors. in International Conference on Indoor Positioning and Indoor Navigation (IPIN2010) (pp. 1-10). [more info]
  • Conference contribution Arnitz D., Adamiuk G., Mühlmann U. & Witrisal K. (2010) UWB channel sounding for ranging and positioning in passive UHF RFID. in COST 2100 Management Committee Meeting (pp. -). [more info]
  • Conference contribution Gigl T., Meissner P., Preishuber-Pfluegl J. & Witrisal K. (2010) UWB System-Level Simulator for Positioning and Tracking (U-SPOT). in International Conference on Indoor Positioning and Indoor Navigation, IPIN2010 (pp. 1-9). [more info] [doi]
  • Conference contribution Arnitz D., Mühlmann U. & Witrisal K. (2010) Tag-Based Sensing and Positioning in Passive UHF RFID: Tag Reflection. in Third International EURASIP Workshop on RFID Technology (pp. 51-56). [more info]
  • Conference contribution Meissner P., Steiner C. & Witrisal K. (2010) UWB Positioning with Virtual Anchors and Floor Plan Information. in Workshop on Positioning, Navigation and Communication (pp. 150-156). [more info]
  • Conference contribution Gigl T., Troesch F., Preishuber-Pfluegl J. & Witrisal K. (2010) Maximal Operating Distance Estimation using IEEE 802.15.4a Ultra Wideband. in Korea-Australia International Conference Alliance (KOALA2010) (pp. 84-92). [more info]
  • Article Arnitz D., Mühlmann U. & Witrisal K. (2010) UWB Ranging in Passive UHF RFID: Proof of Concept. in Electronics letters, 46(20), p. 1401-1402. [more info] [doi]
  • Poster Arnitz D., Mühlmann U. & Witrisal K. (2010) Wideband Characterization of UHF RFID Channels for Ranging and Positioning.. [more info]
  • (Old data) Lecture or Presentation Geiger B., Gigl T. & Witrisal K. (2009) Ranging in the IEEE 802.15.4a Using Energy Detectors.. [more info]
  • (Old data) Lecture or Presentation Gigl T., Preishuber-Pfluegl J. & Witrisal K. (2009) Stistical Analysis of an Energy Detector for Ranging in IEEE 802.15.4a.. [more info]
  • (Old data) Lecture or Presentation Meissner P. & Witrisal K. (2009) Multichannel Ultra-wideband Systems with Noncoherent Autocorrelation Detection.. [more info]
  • Conference contribution Gigl T., Buchgraber T., Adalan A., Preishuber-Pfluegl J., Fischer M. & Witrisal K. (2009) UWB Channel Characterization using IEEE 802.15.4a Demonstrator System. in Ultra Wideband 2009, ICUWB 2009 (pp. 230-234). [more info] [doi]
  • Conference contribution Gigl T., Preishuber-Pfluegl J., Arnitz D. & Witrisal K. (2009) Experimental Characterization of Ranging in IEEE 802.15.4a using a Coherent Reference Receiver. in IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2009. [more info]
  • Conference contribution Adalan A., Fischer M., Gigl T., Witrisal K., Scholtz A. & Mecklenbräuker C. (2009) Ultra-Wideband Radio Pulse Shaping Filter Design for IEEE 802.15.4a Transmitter. in IEEE Wireless Communications and Networking Conference (pp. 1-6). [more info] [doi]
  • Conference contribution Adalan A., Gigl T., Fischer M. & Witrisal K. (2009) A Modular Impulse Radio Ultra-Wideband Research & Development Platform for IEEE 802.15.4a. in 2009 European Wireless Technology Conference (pp. 116-119). [more info]
  • Conference contribution Gigl T., Buchgraber T., Geiger B., Adalan A., Preishuber-Pfluegl J. & Witrisal K. (2009) Pathloss and Delay-Spread Analysis of Multipath Intensive Environments using IEEE 802.15.4a UWB Signals. in COST 2100 Management Committee Meeting. [more info]
  • Conference contribution Prainsack J. & Witrisal K. (2009) Performance of a Limiting Amplifier in White and Colored Noise. in IEEE MTT-S International Microwave Workshop on Wireless Sensing, Local Positioning, and RFID (pp. 1-4). [more info] [doi]
  • Conference contribution Arnitz D., Mühlmann U., Gigl T. & Witrisal K. (2009) Wideband System-Level Simulator for Passive UHF RFID. in Proceedings of the IEEE International Conference on RFID, 2009 (pp. 28-33). [more info]
  • Conference contribution Gigl T., Preishuber-Pfluegl J. & Witrisal K. (2009) Statistical Analysis of a UWB Energy Detector for Ranging in IEEE 802.15.4a. in Ultra Wideband 2009, ICUWB 2009 (pp. 129-134). [more info] [doi]
  • Conference contribution Witrisal K. (2009) A Memristor-Based Multicarrier UWB Receiver. in Proc. IEEE Intern. Conf. on Ultra-Wideband (pp. 679-683). [more info] [doi]
  • Article Witrisal K. (2009) Memristor-based stored-reference receiver–the UWB solution?. in Electronics letters, 45(14), p. 713-714. [more info] [doi]
  • Article Witrisal K., Leus G., Janssen G., Pausini M., Troesch F., Zasowski T. & Romme J. (2009) Noncoherent Ultra-Wideband Systems. in IEEE signal processing magazine, 26(4), p. 48-66. [more info] [doi]
  • Article Arnitz D., Witrisal K. & Mühlmann U. (2009) Multi-Frequency Continuous-Wave Radar Approach to Ranging in Passive UHF RFID. in IEEE transactions on microwave theory and techniques, 57(5), p. 1398-1405. [more info] [doi]
  • Article Geiger B., Gigl T., Preishuber-Pfluegl J. & Witrisal K. (2009) Experimental Characterization of System Parameters for Ranging in IEEE 802.15.4a using Energy Detectors. in Radioengineering, 18(3), p. 249-257. [more info]
  • (Old data) Lecture or Presentation Gigl T., Preishuber-Pfluegl J. & Witrisal K. (2008) Experimental Verification of UWB Energy Detection Ranging in the IEEE802.15.4a Standard.. [more info]
  • (Old data) Lecture or Presentation Arnitz D., Mühlmann U. & Witrisal K. (2008) Modular System-Level Simulator for Passive UHF RFID.. [more info]
  • (Old data) Lecture or Presentation Gigl T. & Witrisal K. (2008) Statistical Modeling of a UWB Energy Detector Receiver According to the IEEE802.15.4a Standard.. [more info]
  • Conference contribution Harmer D., Russell M., Frazer E., Bauget T., Ingram S., Schmidt N., Kull B., Yarovoy A., Nezirovic A., Xia L., Dizdarevic V. & Witrisal K. (2008) EUROPCOM: Emergency Ultrawideband RadiO for Positioning and COMmunications. in IEEE International Conference on Ultra-Wideband (pp. n-a). [more info]
  • Conference contribution Witrisal K. (2008) UWB OFDM with Noncoherent Autocorrelation Detection. in IEEE International Conference on Ultra-Wideband (pp. n-a). [more info]
  • Conference contribution Wu W., Wang C., Chao C. & Witrisal K. (2008) On Parameter Estimation for Ultra-Wideband Channels with Clustering Phenomenon. in IEEE Vehicular Technology Conference (pp. n-a). [more info]
  • Conference contribution Dizdarevic V. & Witrisal K. (2008) Distance Measurement Tests Using the Emergency UWB Radio Positioning and Communications (EUROPCOM) Demonstrator. in COST 2100 Management Committee Meeting (pp. tbd-tbd). [more info]
  • Conference contribution Witrisal K. (2008) A Noncoherent Multiband Receiver for IEEE802.15.4a UWB Signals. in COST 2100 Management Committee Meeting (pp. n-a). [more info]
  • Conference contribution Harmer D., Russell M., Frazer E., Bauget T., Ingram S., Schmidt N., Kull B., Yarovoy A., Nezirovic A., Xia L., Dizdarevic V. & Witrisal K. (2008) An Ultra-Wide Band Indoor Personnel Tracking System for Emergency Situations (EUROPCOM). in European Microwave Conference (pp. n-a). [more info]
  • Conference contribution Witrisal K. (2008) Statistical Analysis of the IEEE 802.15.4a UWB PHY over Multipath Channels. in IEEE Wireless Communications and Networking Conference (pp. 130-135). [more info] [doi]
  • Conference contribution Baringbing J. & Witrisal K. (2008) Performance Evaluation of Multiple-Access Dual-Pulse Transmitted Reference UWB Systems. in International Wireless Communications and Mobile Computing Conference (pp. n-a). [more info]
  • Habilitation Witrisal K. (2008) Design and Analysis of Noncoherent UWB Transceivers.. [more info]
  • Article Witrisal K. & Pausini M. (2008) Statistical Analysis of UWB Channel Correlation Functions. in IEEE transactions on vehicular technology, 57(3), p. 1359-1373. [more info] [doi]
  • Article Krall C., Witrisal K., Leus G. & Koeppl H. (2008) Minimum Mean Square Error Equalization for Second-Order Volterra Systems. in IEEE transactions on signal processing, 56(10), p. 4729-4737. [more info] [doi]
  • Conference contribution Krall C., Vogel C. & Witrisal K. (2007) Time-Interleaved Digital-to-Analog Converters for UWB Signal Generation. in International Conference on Ultra Wide-Band (pp. ---). [more info]
  • Conference contribution Demessie Y. & Witrisal K. (2007) Two stage narrowband interference mitigation for transmitted reference UWB systems. in IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. [more info]
  • Conference contribution Baringbing J. & Witrisal K. (2007) MMSE Optimization of the Hybrid Matched-Filter Receiver for Transmitted-Reference UWB. in Personal, Indoor and Mobile Radio Communications (PIMRC'07) (pp. 1-5). [more info] [doi]
  • Conference contribution Demessie Y. & Witrisal K. (2007) Energy detection under narrowband interference in UWB systems. in International Conference on Information, Communications & Signal Processing. [more info]
  • Conference contribution Dizdarevic V. & Witrisal K. (2007) Statistical UWB Range Error Model for the Threshold Leading Edge Detector. in International Conference on Information, Communications & Signal Processing (pp. 1-5). [more info]
  • Conference contribution Witrisal K. & Pausini M. (2007) UWB Channel Characterization for System Studies. in COST 2100 Management Committee Meeting (pp. n-a). [more info]
  • Conference contribution Gigl T., Janssen G., Dizdarevic V., Witrisal K. & Irahhauten Z. (2007) Analysis of a UWB Indoor Positioning System Based on Received Signal Strength. in WPNC (pp. 97-101). [more info]
  • Article Demessie Y. & Witrisal K. (2007) Modeling and Mitigation of Narrowband Interference for Transmitted-Reference UWB Systems. in IEEE journal of selected topics in signal processing, 1(3), p. 456-469. [more info]
  • Conference contribution Dizdarevic V. & Witrisal K. (2006) On Topology Dependent Mitigation of NLOS Ranging Errors in LSE Positioning. in IEEE Vehicular Technology Conference (pp. 0-0). [more info]
  • Conference contribution Krall C. & Witrisal K. (2006) Parallel OFDM Signal Generation for UWB Systems. in IEEE International Conference on Ultra-Wideband (pp. 243-247). [more info]
  • Conference contribution Demessie Y. & Witrisal K. (2006) Detection of Delay-Hopped Transmitted-Reference UWB Signals Under Narrowband Interference. in IEEE Workshop on Signal Processing Advances in Wireless Communications (pp. 0-0). [more info]
  • Conference contribution Witrisal K. & Pausini M. (2006) Statistical Analysis of Transmitted-Reference UWB Systems on Multipath Channels. in IEEE International Conference on Ultra-Wideband (pp. 0-0). [more info]
  • Conference contribution Romme J. & Witrisal K. (2006) Reduced Memory Modeling and Equalization of Second order FIR Volterra Channels in Non-coherent UWB Systems. in European Signal Processing Conference (pp. 0-0). [more info]
  • Conference contribution Romme J. & Witrisal K. (2006) Impact of Transmitted-Reference Modulation on Linear Equalization of Non-Linear ISI Channels. in IEEE Vehicular Technology Conference. [more info]
  • Conference contribution Petrochilos N. & Witrisal K. (2006) Semi-Blind Source Separation for Memoryless Volterra Channels in UWB and its Uniqueness. in IEEE Workshop on Sensor Array and Multi-channel Processing (pp. 0-0). [more info]
  • Conference contribution Tchere F., Ubolkosold P., Knedlik S., Loffeld O. & Witrisal K. (2006) Data-Aided Timing Acquisition in UWB Differential Transmitted Reference Systems. in IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (pp. 0-0). [more info]
  • Conference contribution Pammer V. & Witrisal K. (2006) Ultra Wideband Communication System as Sensor Technology for 3D Mapping. in IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (pp. 0-0). [more info]
  • Conference contribution Dizdarevic V. & Witrisal K. (2006) On Impact of Topology and Cost Function on LSE Position Determination in Wireless Networks. in 3rd Workshop on Positioning, Navigation and Communication (pp. 129-138). [more info]
  • Article Pausini M., Janssen G. & Witrisal K. (2006) Performance Enhancement of Differential UWB Autocorrelation Receivers under ISI. in IEEE journal on selected areas in communications, 24(4), p. 815-821. [more info]
  • Article Romme J. & Witrisal K. (2006) Transmitted-Reference UWB Systems Using Weighted Autocorrelation Receivers. in IEEE transactions on microwave theory and techniques, 54(4), p. 1754-1761. [more info]
  • Conference contribution Witrisal K. & Pausini M. (2005) Analysis and Validation of Inter-Frame-Interference in Impulse Radio UWB Autocorrelation Receivers. in COST273 Management Committee Meeting. [more info]
  • Conference contribution Pausini M., Janssen G. & Witrisal K. (2005) Delay Hopping and Chip Code Design for Frame Differential UWB Autocorrelation Receiver. in IEEE International Conference on Communications. [more info]
  • Conference contribution Romme J. & Witrisal K. (2005) On Transmitted-Reference UWB Systems Using Discrete-Time Weighted Autocorrelation. in IEEE Vehicular Technology Conference. [more info]
  • Conference contribution Steiner C. & Witrisal K. (2005) Multiuser Interference Modeling and Suppression for a Multichannel Differential IR-UWB System. in IEEE International Conference on Ultra-Wideband. [more info]
  • Conference contribution Witrisal K. & Pausini M. (2005) Impact of Multipath Propagation on Impulse Radio UWB Autocorrelation Receivers. in IEEE International Conference on Ultra-Wideband. [more info]
  • Conference contribution Krall C., Witrisal K., Köppl H., Leus G. & Pausini M. (2005) Nonlinear Equalization for Frame-Differential IR-UWB Receivers. in International Conference on Ultra-Wideband (ICU) (pp. 576-581). [more info]
  • Conference contribution Witrisal K. & Demessie Y. (2005) Narrowband Interference Mitigation for Differential UWB Systems. in Asilomar Conference on Signals, Systems and Computers. [more info]
  • Conference contribution Romme J. & Witrisal K. (2005) Analysis of QPSK Transmitted-Reference Systems. in IEEE International Conference on Ultra-Wideband. [more info]
  • Patent Witrisal K. (2005) Multiuser Differential Ultra-Wideband Communications System.. [more info]
  • Article Witrisal K., Leus G., Pausini M. & Krall C. (2005) Equivalent System Model and Equalization of Differential Impulse Radio UWB Systems. in IEEE journal on selected areas in communications, 23(9), p. 1851-1862. [more info] [doi]
  • Conference contribution Witrisal K. & Pausini M. (2004) Equivalent System Model of ISI in a Frame-Differential IR-UWB Receiver. in IEEE Global Telecommunications Conference. [more info]
  • Conference contribution Pausini M., Janssen G. & Witrisal K. (2004) Analysis of ISI for an IR UWB Symbol-Differential Autocorrelation Receiver. in IEEE Vehicular Technology Conference. [more info]
  • Conference contribution Pausini M., Janssen G. & Witrisal K. (2004) Noise Analysis for Symbol-Differential IR-UWB Autocorrelation Receivers. in Proceedings / Symposium on Communications and Vehicular Technology. [more info]
  • Conference contribution Rahman I., Witrisal K., Das S., Fitzek F., Olsen O. & Prasad R. (2004) Optimum Pre-DFT combining with cyclic delay diversity for OFDM based WLAN systems. in IEEE Vehicular Technology Conference, VTC. [more info]
  • Conference contribution Romme J. & Witrisal K. (2004) On transmitted-reference UWB systems using discrete-time weighted autocorrelation. in COST273 Management Committee Meeting. [more info]
  • Conference contribution Witrisal K., Pausini M. & Trindade A. (2004) Multiuser interference and inter-frame interference in UWB transmitted reference systems. in International Workshop on Ultra-Wideband Systems, IWUWBS. [more info]
  • Chapter Witrisal K. (2004) Basics of OFDM and Synchronization. Artech House, 1 ed. (Universal Personal Communications). [more info]
  • Chapter Witrisal K. (2004) Appropriate Channel Model for OFDM Systems. Artech House, 1 ed. (Universal Personal Communications). [more info]
  • Conference contribution Rahman I., Witrisal K., Olsen O. & Prasad R. (2003) Performance comparison between MRC receiver diversity and cyclic delay diversity in OFDM WLAN systems. in Proc. Intern. Symp. on Wireless Personal Multimedia Commun., WPMC. [more info]
  • Doctoral Thesis Witrisal K. (2002) OFDM air-interface design for multimedia communications.. [more info]
  • Article Witrisal K., Kim Y. & Prasad R. (2001) A New Method to Measure Parameters of Frequency-Selective Radio Channels Using Power Measurements. in IEEE transactions on communications, 49(10), p. 1788-1800. [more info] [doi]
  • Article Witrisal K. (2001) On estimating the RMS delay spread form the frequency-domain level crossing rate. in IEEE communications letters, 5(7), p. 287-289. [more info] [doi]
  • Article Witrisal K., Kim Y. & Prasad R. (1998) RMS delay spread estimation technique using non-coherent channel measurements. in Electronics letters, 34(20), p. 1918-1919. [more info]