Work in xDSL focuses on problems of multicarrier transmission, like PAR reduction, time-domain equalization, bit-allocation. To name just a few outcomes of this research:

  •    First real capacity optimizing time-domain equalizer
  •    PAR reduction scheme which is widely used (many million installations)
  •    A bit-allocation scheme allowing for arbitrary SNR margins between priority classes
  •    First MIMO-DMT proposal based on singular-value decomposition
  •    Multi-line fully automatic 24-pair cable measurement tool (ftw.)
  • Journal Articles

    Henkel, Werner; Ölçer, Sedat; Jacobsen, Krista; Saltzberg, Burton

    Twisted Pair Transmission -- Ever Increasing Performances on Ancient Telephone Wires Journal Article

    Editorial IEEE J-SAC, 20 (6), pp. 877-880, 2002.

    Links | BibTeX

    Magesacher, Thomas; , Werner Henkel; Tauböck, Georg; Nordström, Tomas

    Cable Measurements Supporting xDSL Technologies Journal Article

    e&i, 119 (2), 2002.

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    Werner Henkel, Björn Wagner

    Another Application for Trellis Shaping: PAR Reduction for DMT (OFDM) Journal Article

    IEEE Transactions on Communications, 48 (9), pp. 1471-1476, 2000, (Note: Color version with correction in Eq. (2) and unpublished appendix available for download).

    Links | BibTeX

    Keßler, Thomas; Henkel, Werner

    Simulation of ADSL over ISDN on German Subscriber Lines Journal Article

    IEEE Communications Letters, 1 (5), 1997.

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    Werner Henkel, Björn Wagner

    Trellis-Shaping zur Reduktion des Spitzen/Mittelwert-Verhältnisses bei DMT / OFDM Journal Article

    OFDM-Fachgespräch in Braunschweig, 1996.

    BibTeX

    Henkel, Werner; Keßler, Thomas; Chung, Hong

    Coded 64-CAP ADSL in an Impulse-Noise Environment -- Modeling of Impulse Noise and First Simulation Results Journal Article

    IEEE JSAC, 13 (9), pp. 1611-1621, 1995, (Note: In Eqn. (6), 80 should be replaced by 90 and 167 by 177. The parameters s1and s2 in Eqn. (5) need to be divided by 10.24E6).

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    Werner Henkel, Hong Chung

    Coded 64-CAP ADSL in an Impulse-Noise Environment -- Simulation Results -- Journal Article

    Globecom '95, Singapore, 1/3 , pp. 168-172, 1995.

    Links | BibTeX

    Workshops

    Graur, Oana; Saaifan, Khodr; Fernando, Thejani; Henkel, Werner

    Impulse noise in DSL, powerline, and wireless Workshop

    Sitzung der ITG Fachgruppe »Angewandte Informationstheorie«, Darmstadt, Germany, 2014.

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    Graur, Oana; Henkel, Werner

    Bit-Error Rates and Correlation Results for Common-Mode Aided Communications Workshop

    DFG TakeOFDM Colloquium, Karlsruhe, 2010.

    Links | BibTeX

    Hassan, Khaled; Henkel, Werner

    Unequal Error Protection Bit Loading in MIMO OFDM Workshop

    Sitzung der ITG-Fachgruppe "Angewandte Informationstheorie", University of Bremen, 2006.

    BibTeX

    Henkel, Werner

    Mehrträgerübertragung bei xDSL Workshop

    Colloquium, Kiel, 2002.

    BibTeX

    Henkel, Werner

    Asymmetrical Digital Subscriber Line (ADSL), Übersicht über die Übertragungsverfahren Workshop

    seminar talk, Fachhochschule Wiesbaden, Rüsselsheim, 1999.

    BibTeX

    Henkel, Werner

    Die konkurrierenden xDSL-Übertragungsverfahren CAP und DMT Workshop

    seminar talk, Vienna University of Technology, Vienna, 1998.

    BibTeX

    Henkel, Werner

    ADSL, die Transportplattform fuer schnellen Internet-Access - Übertragungsverfahren, Datenformate, Dienste, aktuelle Entwicklungen Workshop

    Communica 98, Offenburg, 1998.

    BibTeX

    Henkel, Werner

    The Competing xDSL Transmission Schemes CAP and DMT - an Overview Workshop

    Scientific Colloquium on xDSL, Essen, 1998, (also as seminar talk, Sept. 11, 1998, EPFL Lausanne, Switzerland.).

    BibTeX

    Henkel, Werner

    Ein Verfahren zur Koeffizienteneinstellung des Zeitbereichsentzerrers bei DMT Workshop

    Workshop Schnelle Datenübertragung im Teilnehmeranschlußbereich, Darmstadt, Germany, 1997.

    BibTeX

    Henkel, Werner; Keßler, Thomas

    DMT im Störumfeld der Teilnehmeranschlußleitung Workshop

    Darmstädter OFDM-Workshop, Telekom, Technology Center Darmstadt, 1996.

    BibTeX

    Book Chapters

    Henkel, Werner; Graur, Oana

    OFDM - Concepts for Future Communication Systems Book Chapter

    Rohling, Hermann (Ed.): Springer, 2011, ISBN:978-3-642-17495-7, 2011.

    Links | BibTeX

    Henkel, Werner

    Lexikon der Wirtschaftsinformatik Book Chapter

    Mertens, Peter (Ed.): pp. 50-51, Springer 2001, entry 'Asymmetrical Digital Subscriber Line', 4, 2001.

    Links | BibTeX

    Patents

    Clausen, Alex; Henkel, Werner; Straeussnigg, Dietmar ; Trautmann, Steffen

    Verfahren zum Übertragen von Daten durch Mehrträger-Modulation mit reduziertem Implementierungsaufwandverfahren zur Filterung bei DMT-Systemen Patent

    DE 103 25 838, Germany; international application WO2004/50736 2001.

    BibTeX

    Standards

    Henkel, Werner; Keßler, Thomas

    Performance of Echo-Cancelled ADSL Considering Noise Model B plus Self-NEXT Standard

    ETSI WG TM6, TD35 (981T35A0), Madrid, 1998.

    BibTeX

    Henkel, Werner; Keßler, Thomas

    Performance of Echo-Cancelled ADSL Considering Noise Model B plus Self-NEXT Standard

    ETSI WG TM6, TD35 (981T35A0), Madrid, 1998.

    BibTeX

    Henkel, Werner; Keßler, Thomas

    Impact of Self-NEXT on Upstream and Downstream of an Echo-Cancelled ADSL over ISDN Standard

    ETSI WG TM6, TD14 (974T14A0), Verona, 1997.

    BibTeX

    Henkel, Werner; Keßler, Thomas

    New Results on ADSL Reach Reduction due to 4B3T-ISDN BRA Standard

    ETSI WG TM6, TD25 (973T25A0), Lannion, 1997.

    BibTeX

    Henkel, Werner; Ehre, Andreas; Keßler, Thomas

    Requirements for a Combined POTS/ISDN-ADSL Splitter Standard

    ETSI WG TM6, TD27 (973T27A0), Lannion, 1997.

    BibTeX

    Henkel, Werner

    An Algorithm for Determining the DMT Time-Domain Equalizer Coefficients Standard

    ETSI WG TM6, TD26 (973T26A0), Lannion, 1997.

    BibTeX

    Henkel, Werner; Chow, Peter

    Warm Re-Start for ADSL Standard

    ANSI T1E1.4/97, Minneapolis, MN, USA, 1997.

    BibTeX

    Henkel, Werner; Keßler, Thomas

    ADSL Reach Reduction due to 4B3T-ISDN BRA Standard

    ETSI WG TM6, TD25 (972T25A0), Berlin, Germany, 1997.

    BibTeX

    In Proceedings

    Burstein, Vladimir; Henkel, Werner

    Channel Characterization for Underwater Broadband PLC Sensor Networks In Proceeding

    IEEE International Symposium on Power Line Communications and its Application (ISPLC), Austin, TX, USA, 2015.

    Links | BibTeX

    Wakeel, Abdul; Henkel, Werner

    Least-Squares Iterative PAR Reduction for Point-to-Point Large-Scale MIMO-OFDM Systems In Proceeding

    IEEE International Conference on Communications, ICC 2014 Sydney, Australia, 2014.

    Abstract | Links | BibTeX

    Hassan, Khaled; Saaifan, Khodr; Henkel, Werner

    Prioritized Adaptive Modulation for MIMO-OFDM Using Pre-Ordered SIC In Proceeding

    2012 IEEE 76th Vehicular Technology Conference (VTC2012-Fall), Québec City, Canada, 2012.

    Links | BibTeX

    Wakeel, Abdul; Henkel, Werner; Taseska, Maja

    Peak-to-Average Ratio Reduction with Tone Reservation in Multi-User and MIMO OFDM In Proceeding

    First IEEE International Conference on Communications in China (ICCC 12), Beijing, China, 2012.

    Links | BibTeX

    Hassan, Khaled; Filip, Alexandra; Henkel, Werner

    Adaptive Multiuser MIMO-OFDM QoS-Based Scheduler Using Virtual Channel State Information In Proceeding

    First IEEE International Conference on Communications in China (ICCC 12), Beijing, China, 2012.

    Links | BibTeX

    Graur, Oana; Henkel, Werner

    Improved Error Localization in DSL Systems Based on the Common Mode In Proceeding

    IEEE International Conference on Communications (ICC 2012), Ottawa, Canada, 2012.

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    Graur, Oana; Henkel, Werner

    Erasure Marking in DSL Systems based on the Common-Mode In Proceeding

    16th International OFDM Workshop 2011, Hamburg, Germany, 2011.

    Abstract | Links | BibTeX

    Hassan, Khaled; Filip, Alexandra; Henkel, Werner

    Dynamic User Scheduling in Non-Orthogonal Multiuser MIMO-OFDM In Proceeding

    16th International OFDM Workshop 2011, Hamburg, Germany, 2011.

    Links | BibTeX

    Graur, Oana; Henkel, Werner

    Impulse-Noise Cancellation Utilizing the Common-Mode Signal to Improve the Bit-Error Ratio in DSL Systems In Proceeding

    15th International OFDM Workshop 2010, Hamburg, Germany, 2010.

    Links | BibTeX

    Henkel, Werner

    RS Codes, OFDM, and MIMO In Proceeding

    15th International OFDM Workshop 2010, Hamburg, Germany, 2010.

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    Henkel, Werner; Hu, Fangning; Kodrasi, Ina

    Inherent Time-Frequency Coding in OFDM and ISI Correction without a Cyclic Prefix In Proceeding

    14th International OFDM Workshop 2009, Hamburg, Germany, 2009.

    Links | BibTeX

    Hassan, Khaled; Henkel, Werner

    Prioritized Multi-layer Transmission for MIMO-OFDM Multiuser Broadcast Channel In Proceeding

    14th International OFDM Workshop 2009, Hamburg, Germany, 2009.

    Links | BibTeX

    Hassan, Khaled; Henkel, Werner; Sidhu, Guftaar

    Multiuser MIMO-OFDMA with Different QoS Using a Prioritized Channel Adaptive Technique In Proceeding

    ICC 2009, 2nd International Workshop on Multiple Access Communications, Dresden, Germany, 2009.

    Links | BibTeX

    Hassan, Khaled; Henkel, Werner

    UEP with Adaptive Multilevel Embedded Modulation for MIMO-OFDM Systems In Proceeding

    OFDM-Workshop 2008, Hamburg, Germany, 2008.

    Links | BibTeX

    Hassan, Khaled; Henkel, Werner

    UEP MIMO-OFDM with Beamforming-Combining for Imperfect Channel Information In Proceeding

    OFDM-Workshop, Hamburg, Germany, 2007, (Note: corrected version and presentation available for download).

    Links | BibTeX

    Hassan, Khaled; Henkel, Werner

    UEP with Eigen Beamforming for Partial Channel Information MIMO-OFDM In Proceeding

    2007 IEEE Sarnoff Symposium, Princeton, NJ, USA, 2007.

    Links | BibTeX

    Hassan, Khaled; Henkel, Werner

    OFDM (DMT) Bit and Power Loading for Unequal Error Protection In Proceeding

    OFDM-Workshop, Hamburg, Germany, 2006, (Note: corrected version and presentation available for download).

    Links | BibTeX

    Henkel, Werner; Hu, Fangning

    OFDM and Analog RS/BCH Codes In Proceeding

    OFDM-Workshop, Hamburg, Germany, 2005.

    Links | BibTeX

    Henkel, Werner; Tauböck, Goerg; Ödling, Per; , Per Ola Börjesson; Petersson, Niklas; Johansson, Albin

    The Cyclic Prefix of OFDM/DMT - An Analysis In Proceeding

    IEEE 2002 International Zürich Seminar on Broadband Communications, ETH Zürich, Switzerland, 2002.

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    Henkel, Werner; Nordström, Tomas; Lenger, Werner

    Verbesserung der xDSL-Performance durch das Kabeldesign In Proceeding

    ITG-Fachtagung Kommunikationskabelnetze, Köln, Germany, 2001.

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    Werner Henkel, Thomas Keßler

    A Simplified Impulse-Noise Model for the xDSL Test Environment In Proceeding

    BAC'99 Broadband Access Conference, Krakau, Poland, 1999.

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    Keßler, Thomas; Henkel, Werner

    ADSL über ISDN-Basisanschlüsse In Proceeding

    ITG-Fachtagung `Zukunft der Kommunikationskabelnetze', Köln, 1997.

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    Henkel, Werner

    Ein Adaptionsalgorithmus zur Einstellung des Zeitbereichsvorentzerrers bei DMT (Discrete Multitone) In Proceeding

    OFDM-Fachgespräch, Braunschweig, 1997.

    BibTeX

    Werner Henkel, Björn Wagner

    Trellis-Shaping for Reducing the Peak-to-Average Ratio of Multi-Tone Signals In Proceeding

    IEEE Intern. Symp. on Information Theory Ulm, Germany, 1997.

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    Werner Henkel, Björn Wagner

    Trellis-Shaping for Reducing the Peak-Average Ratio of Multitone Signals In Proceeding

    Workshop on Fundamental Structures of Information, 6th Benelux-Japan Workshop on Coding and Information Theory, Essen, Germany, 1996.

    BibTeX

    Werner Henkel, Jörg Hofmann

    Trellis-Shaping zur Reduzierung der spektralen Erweiterung bei Nichtlinearitäten In Proceeding

    ITG-Fachtagung Codierung für Quelle, Kanal und Übertragung, Munich, 1994.

    Links | BibTeX