Dr.-Ing. Wilhelm Keusgen

Kontakt:

Raum: HHI 1102 Telefon: +49(0)30-31002-639 Email: wilhelm.keusgen@hhi.fraunhofer.de

Forschungsinteressen:

• breitbandige Transceiver-Architekturen
• Kompensation von Hardwareeinflüssen: "Smart RF"
• 60 GHz Funksysteme

Publikationen:

Journal Papers

• An Efficient Frame Aggregation and Block-ACK Scheme for 60 GHz Short-Range Point-to-Point Transmission
  J. Luo, A. Kortke, and W. Keusgen, Wireless Personal Communications, Feb. 2012, Final version available on http://www.springerlink.com/content/473u15112010883g/.
• 60 GHz WLAN applications and implementation aspects
  B. Schulte, M. Peter, R. Felbecker, W. Keusgen, S. Steffen, H. Schumacher, M. Hellfeld, A. Barghouthi, S. Krone, F. Guderian, and G. Fettweis, International Journal of Microwave and Wireless Technologies, vol. 3, pp. 213-221 , Apr. 2011.
• 60 GHz short-range communications: channel measurements, analysis, and modeling
  A. G. Ariza, U. Trautwein, R. Müller, F. Wollenschläger, R. Thomä, J. Kunisch, I. d. l. Torre, R. Felbecker, M. Peter, and W. Keusgen, International Journal of Microwave and Wireless Technologies, vol. 3, pp. 201-211, Mar. 2011.
• Physical layer design, link budget analysis, and digital baseband implementation for 60 GHz short-range applications
  S. Krone, F. Guderian, G. Fettweis, M. Petri, M. Piz, M. Marinkovic, M. Peter, R. Felbecker, and W. Keusgen, International Journal of Microwave and Wireless Technologies, vol. 3, pp. 189-200, Mar. 2011.
• A 60 GHz SiGe-HBT Power Amplifier With 20% PAE at 15 dBm Output Power
  V. Do, V. Subramanian, W. Keusgen, and G. Boeck, IEEE Microwave And Wireless Components Letters, vol. 18, no. 3, pp. 209-211, Mar. 2008.
• Evaluation of MIMO systems with respect to front-end imperfections
  C. Degen, O. Koch, W. Keusgen, and B. Rembold, European Transactions on Telecommunications, vol. 17, pp. 313-323, March 2006.

Conference, Symposium, and Workshop Papers

• 2-Antenna RF Front-End for Cognitive Radio
  J. Liszewski, H. Gäbler, W. Keusgen, and T. Haustein, 7th Karlsruhe Workshop on Software Radios, Mar. 2012.
• Analyzing Human Body Shadowing at 60 GHz: Systematic Wideband MIMO Measurements and Modeling Approaches
  M. Peter, M. Wisotzki, M. Raceala-Motoc, W. Keusgen, R. Felbecker, M. Jacob, S. Priebe, and T. Kürner, 6th European Conference on Antennas and Propagation, EuCAP 2012, Mar. 2012, pp. 1-5.
• Statistical Evaluation of Multipath Component Lifetime in the Car-to-Car Channel at Urban Street Intersections Based on Geometrical Tracking
  P. Paschalidis, K. Mahler, A. Kortke, M. Peter, and W. Keusgen, Vehicular Technology Conference (VTC Spring), 2012 IEEE 75th, IEEE, Yokohama, 2012, pp. 1-5, ISBN: 978-1-4673-0989-9.
• Smart RF Signal Processing for Advanced Transmitters: From Theory to Practice
  J. Luo, J. Liszewski, B. Schubert, W. Keusgen, and A. Kortke, International Symposium on Signals, Systems and Electronics (ISSSE), Potsdam, Germany, Sept. 2012, accepted.
• Electromagnetic Wave Propagation in the Millimeter Wave Band Using the NVIDIA OptiX GPU Ray Tracing Engine
  R. Felbecker, L. Raschkowski, W. Keusgen, and M. Peter, 6th European Conference on Antennas and Propagation, 2009. (EuCAP 2009)., Mar. 2012, pp. 1-5.
• Estimation of permitivitty and loss tangent of high frequency materials in the millimeter wave band using a hemispherical open resonator
  R. Felbecker, W. Keusgen, and M. Peter, IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems (COMCAS), 2011 , Nov. 2011, pp. 1 -8.
• Preamble Based Joint CFO, Frequency-Selective I/Q-Imbalance and Channel Estimation and Compensation in MIMO OFDM Systems
  J. Luo, W. Keusgen, and A. Kortke, IEEE 74th VTC 2011-Fall, San Francisco, USA, 2011.
• An NLOS-Capable 60 GHz MIMO Demonstrator: System Concept & Performance
  W. Keusgen, A. Kortke, L. Koschel, M. Peter, R. Weiler, H. Zirath, M. Gavell, and Z. He, New Circuits and Systems Conference (NEWCAS), 2011 IEEE 9th International , Bordeaux, France, IEEE, June 2011, pp. 265-268 , Print ISBN: 978-1-61284-135-9.
• Low-Complexity FPGA Implementation of Volterra Predistorters for Power Amplifiers
  J. Liszewski, B. Schubert, W. Keusgen, and A. Kortke, IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), Phoenix, USA, Jan. 2011, pp. 41-44.
• Pathloss and Multipath Power Decay of the Wideband Car-to-Car Channel at 5.7 GHz
  P. Paschalidis, K. Mahler, A. Kortke, M. Peter, and W. Keusgen, Vehicular Technology Conference (VTC Spring), 2011 IEEE, Budapest, Hungary, May 2011, pp. 1-5, Print ISBN: 978-1-4244-8332-7.
• 2 × 2 MIMO Measurements of the Wideband Car-to-Car Channel at 5.7 GHz on Urban Street Intersections
  P. Paschalidis, K. Mahler, A. Kortke, M. Wisotzki, M. Peter, and W. Keusgen, Vehicular Technology Conference (VTC Fall), 2011 IEEE, San Francisco, United States, September 2011, pp. 1-5.
• A Flexible Hardware-In-the-Loop Test Platform for Physical Resource Sharing Mechanisms inWireless Networks
  J. Luo, A. Kortke, W. Keusgen, J. Li, M. Haardt, P. Prochazka, and J. Sykora, Future Network and MobileSummit 2011 Conference Proceedings, 2011.
• Preamble Designs for Efficient Joint Channel and Frequency-Selective I/Q-Imbalance Compensation in MIMO OFDM Systems
  J. Luo, W. Keusgen, and A. Kortke, WCNC 2010 Sydney, 2010.
• Semi-blind Iterative Joint Estimation of Frequency Selective I/Q-Imbalance and Modulator Offset Error in Direct-Conversion Transmitters
  J. Luo, W. Keusgen, and A. Kortke, VTC 2010 Fall, Ottawa, 2010.
• Throughput Maximization of a Hybrid Dynamic Frame Aggregation and Block-ACK Scheme for 60 GHz High Speed Communications
  J. Luo, A. Kortke, and W. Keusgen, PIMRC'10, Istanbul, Sept. 2010.
• Smart-RF Project: Wideband digital predistortion for SDR transmitters
  J. Liszewski, B. Schubert, and W. Keusgen, European Reconfigurable Radio Technologies Workshop, Wireless Innovation Forum, Mainz, Germany, June 2010.
• Smart-RF Project: Measurement and Digital Predistortion of Power Amplifiers Using Volterra Series
  J. Liszewski, B. Schubert, and W. Keusgen, German Microwave Conference (GEMIC), Berlin, Germany, Mar. 2010.
• Identification of the Volterra Kernels of Nonlinear Power Amplifiers
  B. Schubert, J. Liszewski, and W. Keusgen, International Conference on Communications, Circuits and Systems (ICCCAS 2009), San Jose, USA, July 2009, pp. 767-771.
• Antenna Diversity Schemes for Uplink Frequency-Domain Multiuser Detection in CP-Assisted DS-CDMA Systems
  J. Luo, A. Kortke, and W. Keusgen, IEEE International Conference on Communications (ICC 2009), Dresden, Germany, June 2009.
• Estimation of Effective Permittivity and Effective Thickness of Inhomogeneous Materials at 52 – 70 GHz
  R. Felbecker, W. Keusgen, A. Kortke, and M. Peter, 3rd European Conference on Antennas and Propagation (EuCAP 2009), Berlin, Germany, Mar. 2009.
• Measurement-Based Investigation of 60 GHz Broadband Transmission for Wireless In-Car Communication
  M. Peter, R. Felbecker, W. Keusgen, and J. Hillebrand, IEEE 70th Vehicular Technology Conference (VTC2009-Fall), Anchorage, USA, Sept. 2009.
• Car-to-Car MIMO Radio Channel Measurements at 5.7 GHz in Typical Communication Scenarios
  P. Paschalidis, A. Kortke, K. Mahler, M. Wisotzki, W. Keusgen, and M. Peter, IEEE 70th Vehicular Technology Conference (VTC2009-Fall), Anchorage, USA, Sept. 2009.
• PAs for mmW Applications: A Comparison of Technologies and Achievements
  G. Böck, W. Keusgen, V. Subramanian, A. Hamidian, B. Schubert, and M. Peter, International Microwave Symposium Workshops (IMS 2009), Boston, USA, June 2009.
• Analysis and Comparison of Indoor Wideband Radio Channels at 5 and 60 GHz
  M. Peter and W. Keusgen, 3rd European Conference on Antennas and Propagation (EuCAP 2009), Berlin, Germany, Mar. 2009.
• Efficient Self-Calibration of Frequency-Dependent I/Q-Imbalance in Direct-Conversion OFDM Transceivers
  J. Luo, A. Kortke, and W. Keusgen, International Symposium on Circuits and Systems (ISCAS 09), Taipei, Taiwan, May 2009.
• Joint Calibration of Frequency Selective Time Variant I/Q-Imbalance and Modulator DC-Offset Error in Broadband Direct-Conversion Transmitters
  J. Luo, A. Kortke, and W. Keusgen, International Conference on Communications, Circuits and Systems (ICCCAS 2009), San Jose, USA, July 2009, accepted.
• Broadband Millimeter Wave Communication - System Design Concepts and Trials
  W. Keusgen, 2008 IEEE MTT-S International Microwave Symposium, Workshop, Atlanta, GA, USA, June 15-20 2008.
• A Wideband Channel Sounder for Car-to-Car Radio Channel Measurements at 5.7 GHz and Results for an Urban Scenario
  P. Paschalidis, M. Wisotzki, A. Kortke, W. Keusgen, and M. Peter, 2008 IEEE 68th Vehicular Technology Conference (VTC2008-Fall), Calgary, Canada, Sept. 21-24 2008.
• Efficient Channel Estimation Schemes for MIMO OFDM Systems with NULL Subcarriers
  J. Luo, A. Kortke, and W. Keusgen, 2008 IEEE 68th Vehicular Technology Conference (VTC2008-Fall), Calgary, Canada, Sept. 21-24 2008.
• Optimization of Time Domain Windowing and Guardband Size for Cellular OFDM Systems
  J. Luo, W. Keusgen, and A. Kortke, 2008 IEEE 68th Vehicular Technology Conference (VTC2008-Fall), Calgary, Canada, Sept. 21-24 2008.
• 60 GHz SiGe HBT Chip Set for High Speed Wireless Communication Systems
  V. Subramanian, W. Keusgen, V. Do, and G. Boeck, German Microwave Conference 2008, Hamburg Germany, March 10-12 2008.
• Design of a 60 GHz transceiver module with integrated antenna
  W. Keusgen, V. Subramanian, and G. Böck, Asia Pacific Microwave Conference (APMC 2008), Hong Kong, China, Dec. 2008.
• 60 GHz Broadband Wireless Transmission Experiments in a NLOS Indoor Environment
  J. Luo, A. Kortke, W. Keusgen, and M. Peter, Asia Pacific Microwave Conference (APMC 2008), Hong Kong, China, Dec. 2008.
• Ray-Tracing Simulations of the 60 GHz Incabin Radio Channel
  R. Felbecker, W. Keusgen, and M. Peter, 2008 URSI General Assembly, Chicago, IL, USA, Aug. 7-16 2008.
• Impact of Antenna Configuration and Shadowing on the Characteristics of the 60 GHz Indoor Wideband Channel
  M. Peter and W. Keusgen, 2008 URSI General Assembly, Chicago, IL, USA, Aug. 7-16 2008.
• Incabin Millimeter Wave Propagation Simulation in a Wide-Bodied Aircraft Using Ray-Tracing
  R. Felbecker, W. Keusgen, and M. Peter, 2008 IEEE 68th Vehicular Technology Conference (VTC2008-Fall), Calgary, Canada, Sept. 21-24 2008.
• A Design Concept for a 60 GHz Wireless In-Flight Entertainment System
  J. Luo, W. Keusgen, A. Kortke, and M. Peter, 2008 IEEE 68th Vehicular Technology Conference (VTC2008-Fall), Calgary, Canada, Sept. 21-24 2008.
• A Survey on 60 GHz Broadband Communication: Capability, Applications and System Design
  M. Peter, W. Keusgen, and J. Luo, European Microwave Week 2008, Amsterdam, The Netherlands, Oct. 27-31 2008.
• Wideband Car-to-Car MIMO Radio Channel Measurements at 5.7 GHz and Issues Concerning Application-Oriented Systems
  P. Paschalidis, M. Wisotzki, A. Kortke, M. Peter, and W. Keusgen, The First International Conference on Wireless Access in Vehicular Environments (WAVE), Dearborn, USA, Dec. 2008.
• A Component-Based Time Domain Wideband Channel Sounder and Measurement Results for the 60 GHz In-Cabin Radio Channel
  M. Peter and W. Keusgen, The Second European Conference on Antennas and Propagation (EUCAP 2007), Edinburgh, UK, Nov. 11-16 2007.
• A 60 GHz Monolithic Upconversion Mixer in SiGe HBT Technology
  V. Do, V. Subramanian, W. Keusgen, and G. Boeck, 2007 IEEE Intl. Workshop on Radio-Frequency Integration Technology (RFIT), Singapore, Dec. 9-11 2007.
• 60 GHz SiGe HBT Downconversion Mixer
  V. Subramanian, V. Do, W. Keusgen, and G. Boeck, European Microwave Week 2007, Munich, Germany, Oct. 8-12 2007.
• Temporal Structure of the 60 GHz Wireless Channel
  M. Peter, W. Keusgen, and A. Kortke, International ITG Conference on Antennas - INICA 2007, Munich, Germany, March 28-30 2007.
• Evaluation of Multiple Antenna Configurations
  W. Keusgen, International ITG Conference on Antennas - INICA 2007, Munich, Germany, March 28-30 2007.
• Measurement and Analysis of the 60 GHz In-Vehicular Broadband Radio Channel
  M. Peter, W. Keusgen, A. Kortke, and M. Schirrmacher, 2007 IEEE 66th Vehicular Technology Conference (VTC2007-Fall), Baltimore, MD, USA, 30 Sep.-3 Oct. 2007.
• Impact of Array Configuration on Channel- and Noise-Covariance in Multiple Antenna Systems
  W. Keusgen, 2007 IEEE 66th Vehicular Technology Conference (VTC2007-Fall), Baltimore, MD, USA, 30 Sep.-3 Oct. 2007.
• Measurement and Ray-Tracing Simulation of the 60 GHz Indoor Broadband Channel: Model Accuracy and Parameterization
  M. Peter, W. Keusgen, and R. Felbecker, The Second European Conference on Antennas and Propagation (EUCAP 2007), Edinburgh, UK, Nov. 11-16 2007.
• Design and Optimization of a High Efficiency 60 GHz SiGe-HBT Power Amplifier
  V. Do, V. Subramanian, W. Keusgen, and G. Boeck, 2007 IEEE Intl. Workshop on Radio-Frequency Integration Technology (RFIT), Singapore, Dec. 9-11 2007.