Dr.-Ing. Marcus Windisch

	Postal Address:	Technische Universität Dresden Fakultät Elektrotechnik und Informationstechnik Vodafone Stiftungslehrstuhl Mobile Nachrichtensysteme D-01062 Dresden, Germany
	Visit Address:	Barkhausenbau, Room II-17C Helmholtzstraße 18 01069 Dresden
	Phone:	+49 351 463 41 071
	Fax:	+49 351 463 41 099
	e-mail:	windisch@ifn.et.tu-dresden.de

Scientific Interests

• Design and optimization of wireless communications systems
• Modeling, estimation, and compensation of RF impairments
• Special focus: Blind estimation and compensation of I/Q imbalance

• Independence of dedicated pilots or calibration signals
• Robustness to noise and other RF impairments
• On-line tracking of both frequency-selective and time-varying I/Q imbalance
• Applicability in multi-standard and multi-antenna (MIMO) systems

Doctoral Thesis

• Modeling of I/Q imbalance
• Overview and classification of various state-of-the-art I/Q imbalance compensation techniques
• Analysis of performance degradations due to I/Q imbalance
• Closed-form solutions for bit/symbol error probabilities
• Blind estimation and compensation of both frequency-selective and time-varying I/Q imbalance

Selected Publications (by topic)

Dirty RF

• G. Fettweis, M. Loehning, D. Petrovic, M. Windisch, P. Zillmann and W. Rave.
  Dirty RF: A New Paradigm
  International Journal of Wireless Information Networks (IJWIN), 14(2):133-148, June 2007
  
  

Theoretical Performance Analysis

• M. Windisch and G. Fettweis.
  Performance Degradation due to I/Q Imbalance in Multi-Carrier Direct Conversion Receivers: A Theoretical Analysis
  IEEE International Conference on Communications (ICC'06), Istanbul, Turkey, June 2006
  
  
• M. Windisch and G. Fettweis.
  On the Impact of I/Q Imbalance in Multi-Carrier Systems for Different Channel Scenarios (invited paper)
  IEEE International Symposium on Circuits and Systems (ISCAS'07), New Orleans, USA, May 2007
  
  

Estimation and Compensation of I/Q Imbalance in OFDM Direct-Conversion Receivers

• M. Windisch and G. Fettweis.
  Standard-Independent I/Q Imbalance Compensation in OFDM Direct-Conversion Receivers
  9th International OFDM Workshop (InOWo'04), Dresden, Germany, September 2004
  
  
• M. Windisch and G. Fettweis.
  Blind Estimation and Compensation of Receiver I/Q Imbalance in OFDM Systems with Enhancements through Kalman Filtering
  IEEE Statistical Signal Processing Workshop (SSP'07), Madison, USA, August 2007
  
  
• M.Windisch and G.Fettweis.
  Preamble Design for an Efficient I/Q Imbalance Compensation in OFDM Direct-Conversion Receivers
  10th International OFDM-Workshop (InOWo'05), Hamburg, Germany, August/September 2005
  
  

Estimation and Compensation of I/Q Imbalance in Low-IF Receivers

• M. Windisch and G. Fettweis.
  Blind I/Q Imbalance Parameter Estimation and Compensation in Low-IF Receivers (invited paper)
  1st International Symposium on Control, Communications and Signal Processing (ISCCSP'04), Hammamet, Tunisia, March 2004
  
  
• I.Riedel, M.Windisch and G.Fettweis.
  On the Impact of Analog-to-Digital Conversion on Blind I/Q Imbalance Parameter Estimation in Low-IF Receivers
  1st International Conference on Wireless Networks, Communications and Mobile Computing (WirelessCom'05), Maui, Hawaii, June 2005
  
  

Estimation and Compensation of Transmitter I/Q Imbalance

• M. Windisch and G. Fettweis.
  Adaptive I/Q Imbalance Compensation in Low-IF Transmitter Architectures
  60th IEEE Vehicular Technology Conference (VTC'04), Los Angeles, USA, September 2004
  
  
• M. Stege, T. Hentschel, M. Löhning, M. Windisch and G. Fettweis.
  IEEE 802.11n MIMO-Prototyping with Dirty RF Using the Hardware-in-the-Loop Approach
  14th European Signal Processing Conference (EUSIPCO'06), Florence, Italy, September 2006
  
  

Projects

• WIGWAM - Wireless Gigabit with Advanced Multimedia Support
• MARIO - Multi Access System in Packet Radio
• RMS - Reconfigurable Mobile Communications Systems
• CONDOR - Coping with Nonlinearities, DC-Offset and other RF-Imperfections
• MMFilt - Multimode Baseband Filter

Freedelity

Private Pictures