Dr.-Ing. Volker Pohl

Contact:

Email:

volker.pohl@mk.tu-berlin.de

Dauer der Mitarbeit:

bis 2011

Thema der Arbeit:

Die Analytische und Algebraische Struktur frequenzselektiver Vektorkanäle und deren Einfluss auf die Zeitbereichsentzerrung

Research interests:

• system theory
• statistical signal processing
• detection and estimation

Publications:

Books

• Advanced Topics in System and Signal Theory: A Mathematical Approach
  V. Pohl and H. Boche, Foundations in Signal Processing, Communications and Networking, Springer, Berlin, 2009, vol. 4, 978-3-642-03639-2.

Journal Papers

• U-Invariant Sampling: Extrapolation and Causal Interpolation from Generalized Samples
  T. Michaeli, V. Pohl, and Y. C. Eldar, IEEE Trans. Signal Processing, vol. 59, no. 5, May 2011.
• Recovering Signals from Lowpass Data
  Y. C. Eldar and V. Pohl, IEEE Trans. Signal Processing, vol. 58, no. 5, pp. 2636-2646, May 2010.
• Zero-Forcing Precoding for Frequency Selective MIMO Channels with H-infinity Criterion and Causality Constraint
  S. Wahls, H. Boche, and V. Pohl, Signal Processing, vol. 89, no. 9, pp. 1754-1761, Sept. 2009, doi:10.1016/j.sigpro.2009.03.010, preprint available at http://arxiv.org/abs/0803.0428.
• Rate of Convergence in Approximating the Spectral Factor of Regular Stochastic Sequences
  H. Boche and V. Pohl, IEEE Trans. Inform. Theory, vol. 55, no. 12, pp. 5674-5681, Dec. 2009.
• On the Calculation of the Hilbert Transform from Interpolated Data
  H. Boche and V. Pohl, IEEE Trans. Inform. Theory, vol. 54, no. 5, pp. 2358-2366, May 2008.
• Robustness of the Inner-Outer Factorization and of the Spectral Factorization for FIR Data
  H. Boche and V. Pohl, IEEE Trans. Signal Processing, vol. 56, no. 1, pp. 274-283, Jan. 2008.
• On the Boundedness of the Spectral Factorization Mapping on Decomposing Banach Algebras
  H. Boche and V. Pohl, SIAM J. Control Optim., vol. 47, no. 3, p. 1415 – 1427, 2008.
• Boundedness Behavior of the Spectral Factorization for Polynomial Data in the Wiener Algebra
  H. Boche and V. Pohl, IEEE Trans. Signal Process., vol. 56, no. 7, p. 3100 – 3107, July 2008.
• Continuity versus boundedness of the spectral factorization mapping
  H. Boche and V. Pohl, Studia Math., vol. 189, no. 2, pp. 131-145, 2008.
• The Stability and Continuity Behavior of the Spectral Factorization in the Wiener Algebra with Applications in Wiener Filtering
  H. Boche and V. Pohl, IEEE Trans. Circuits and Systems-I, vol. 55, no. 10, pp. 3063-3076, Nov. 2008.
• Behaviour of the Spectral Factorization for Continuous Spectral Densities
  H. Boche and V. Pohl, Signal Processing, vol. 87, no. 5, pp. 1078-1088, May 2007.
• Signal Representation and Approximation - Fundamental Limits
  H. Boche and V. Pohl, European Trans. Telecommun. (ETT), vol. 18, no. 5, pp. 445-456, Aug. 2007, Special Issue on Turbo Coding 2006.
• On the Behavior of Causal Projections with Applications
  H. Boche and V. Pohl, Signal Processing, vol. 87, no. 12, pp. 3108-3130, Dec. 2007.
• Spectral Factorization for Polynomial Spectral Densities - Impact of Dimension
  H. Boche and V. Pohl, IEEE Trans. Inform. Theory, vol. 53, no. 11, Nov. 2007.
• Structural Properties of the Wiener Filter -- Stability, Smoothness Properties, and FIR Approximation Behavior
  H. Boche and V. Pohl, IEEE Trans. Inform. Theory, vol. 52, no. 9, pp. 4272-4282, Sept. 2006.
• On the Behavior of Disk Algebra Bases with Applications
  H. Boche and V. Pohl, Signal Processing, vol. 86, no. 12, pp. 3915-3922, Dec. 2006.
• The Algebraic Structure of Frequency-Selective MIMO Channels
  V. Pohl, V. Jungnickel, and C. v. Helmolt, IEEE Trans. on Signal Processing, vol. 53, no. 7, pp. 2498-2512, July 2005.
• Continuous Flat Fading MIMO Channels: Achievable Rate and the Optimal Length of the Training and Data Phase
  V. Pohl, P. Nguyen, V. Jungnickel, and C. v. Helmolt, IEEE Trans. Wireless Commun., vol. 4, no. 4, pp. 1889-1900, July 2005.
• Spectral Factorization in the Disk Algebra
  H. Boche and V. Pohl, Complex Var. Theory Appl., vol. 50, no. 6, pp. 383-387, May 2005.
• Characterization of Holomorphic Functions in Terms of their Moduli
  H. Boche and V. Pohl, Complex Var. Theory Appl., vol. 50, no. 13, pp. 1025-1029, Oct. 2005.
• Over-the-Air Demonstration of Spatial Multiplexing at High Data Rates using Real-Time Base-Band Processing
  V. Jungnickel, T. Haustein, A. Forck, U. Krueger, V. Pohl, and C. v. Helmolt, Advances in Radio Sciences, vol. 2, 2004.
• Capacity of MIMO Systems with Closely-Spaced Antennas
  V. Jungnickel, V. Pohl, and C. v. Helmolt, IEEE Commun. Letters, vol. 7, no. 9, pp. 361-363, Aug. 2003.
• Electronic Tracking for Wireless Infrared Communications
  V. Jungnickel, A. Forck, T. Haustein, U. Krüger, V. Pohl, and C. v. Helmolt, IEEE Trans. Wireless Commun., vol. 2, no. 5, pp. 989-999, Sept. 2003.
• A Physical Model of the Wireless Infrared Communication Channel
  V. Jungnickel, V. Pohl, S. Noennig, and C. v. Helmolt, IEEE J. Select. Areas Commun., vol. 20, no. 3, pp. 631-640, Apr. 2002.
• Integrating Sphere Diffuser for Wireless Infrared Communication
  V. Pohl, V. Jungnickel, and C. v. Helmolt, IEE Proc.-Optoelectron, vol. 147, no. 4, pp. 281-285, Aug. 2000.

Conference, Symposium, and Workshop Papers

• Spectrum Sencing for Cognitive Radio Architectures based on sub-Nyquist Sampling Schemes
  V. Pohl, F. Suratman, A. M. Zoubir, and H. Boche, Intern. ITG Workshop on Smart Antennas (WSA), Aachen, Germany, Feb. 2011.
• Signal Recovery in Shift-Invariant Spaces from Partial Frequency Data
  V. Pohl and Y. C. Eldar, 36th Intern. Conf. on Acoustics, Speech, and Signal Processing (ICASSP), Prague, Czech Republic, May 2011.
• Caual Signal Recovery from U-Invariant Samples
  T. Michaeli, Y. C. Eldar, and V. Pohl, 36th Intern. Conf. on Acoustics, Speech, and Signal Processing (ICASSP), Prague, Czech Republic, May 2011.
• Signal Recovery from Low Frequency Components
  Y. C. Eldar and V. Pohl, 44th Asilomar Conf. on Signals, Systems, and Computers Processing, Pacific Grove, CA, USA, Nov. 2010.
• There is no free lunch with causal approximations
  H. Boche and V. Pohl, Proc. 32nd IEEE Intern. Conf. on Acoustics, Speech, and Signal Processing (ICASSP), Honolulu, HI, USA, Apr. 2007, pp. 765-768.
• Approximation and Convergence Behavior of Spectral Factorization Methods
  H. Boche and V. Pohl, Proc. IEEE Intern. Symposium on Inform. Theory (ISIT), Nice, France, June 2007, pp. 1131-1135.
• On the Boundedness Behavior of the Spectral Factorization in the Wiener Algebra for FIR Data
  H. Boche and V. Pohl, Proc. 15th European Signal Processing Conf. (EUSIPCO), Poznan, Poland, Sept. 2007.
• General Characterization of Bezout Space-Time Equalizers and Precoder
  H. Boche and V. Pohl, IEEE Intern. Zürich Seminar on Commun., ETH Zürich, Switzerland, Feb. 2006, pp. 30-33.
• Basis Selection Problems for different Performance Measures - Fundamental Limits
  H. Boche and V. Pohl, 6th Intern. ITG-Conference on Source and Channel Coding (SCC), Munich, Germany, Apr. 2006.
• Analytical and Numerical Behavior of the Spectral Factorization
  H. Boche and V. Pohl, 6th Intern. ITG-Conference on Source and Channel Coding (SCC), Munich, Germany, Apr. 2006.
• Approximation and Representation of Transfer Functions of MIMO Systems under Stability, Causality and Smoothness Constraints
  H. Boche and V. Pohl, 38th Southeastern Symposium on System Theory (SSST), Cookeville, TN, USA, Mar. 2006, pp. 128-132.
• Characterization of the Behavior of Outer Functions with Applications to Spectral Factorization and System Design
  H. Boche and V. Pohl, Proc. 25th Amer. Control Conf. (ACC), Minneapolis, MN, USA, June 2006, pp. 4320-4325.
• Relation between Robustness and Noise Enhancement of Causal Inverses for MIMO Systems
  V. Pohl, H. Boche, and N. Vucic, Proc. Intern. ITG / IEEE Workshop on Smart Antennas (WSA), Schloss Reisensburg, Germany, Mar. 2006.
• MIMO - ISI Channels: Inner-Outer Factorization and Applications to Equalization
  H. Boche and V. Pohl, Intern. Wireless Commun. and Mobile Computing Conf. (IWCMC), Vancouver, Canada, July 2006, pp. 1393-1398, invited.
• There exists no always convergent algorithm for the calculation of spectral factorization, Wiener filter, and Hilbert transform
  H. Boche and V. Pohl, Proc. IEEE Intern. Symposium on Inform. Theory (ISIT), Seattle, WA, USA, July 2006, pp. 118-122.
• MIMO-ISI Channel equalization -- Which Price We Have to Pay for Causality
  H. Boche and V. Pohl, Proc. 14th European Signal Processing Conf. (EUSIPCO), Florence, Italy, Sept. 2006, invited.
• Necessary and Sufficient Condition for the Continuity of all Causal Projections with Applications
  H. Boche and V. Pohl, Proc. 45th IEEE Conf. on Decision and Control (CDC), San Diego, CA, USA, Dec. 2006, pp. 5353-5358.
• The Peak-to-Average Power Reduction Problem - Fundamental Limits and Connection with Fourier Analysis
  H. Boche and V. Pohl, Proc. 5th MATHMOD Conference , Vienna, Austria, Feb. 2006.
• BIBO Norm in Spectral Factorization and Wiener Filtering
  H. Boche and V. Pohl, Proc. 9th Canadian Workshop on Inform. Theory (CWIT), Montreal, Canada, June 2005.
• Spectral Factorization, Whitening- and Estimation Filter - Stability, Smoothness Properties and FIR Approximation Behavior
  H. Boche and V. Pohl, Proc. Intern. Symposium on Inform. Theory (ISIT), Adelaide, Australia, Sept. 2005, pp. 1701-1705.
• Geometrical Characterization of the Optimal Causal Linear MIMO-Channel Inverse
  H. Boche and V. Pohl, Proc. 8th Intern. Symposium on Wireless Personal Multimedia Commun. (WPMC), Aalborg, Denmark, Sept. 2005.
• General Structure of the Causal and Stable Inverses of MIMO Systems with ISI
  H. Boche and V. Pohl, Proc. 16th IEEE Intern. Symposium on Personal, Indoor and Mobile Radio Commun. (PIMRC), Berlin, Germany, Sept. 2005.
• Continuity of the Outer Factorization and Mapping Properties with Applications
  H. Boche and V. Pohl, Joint 44th IEEE Conf. on Decision and Control and European Control Conf. (CDC-ECC), Seville, Spain, Dec. 2005, pp. 548-553.
• A MIMO RAKE Receiver with Enhanced Interference Cancellation
  V. Jungnickel, H. Chen, and V. Pohl, Proc. 61st IEEE Semiannual Vehicular Techn.Conf. (VTC 2005), vol. 5, Stockholm, Sweden, May 2005, pp. 3137-3141.
• Performance of MIMO Rake receivers in WCDMA systems
  V. Jungnickel, Y. Chang, and V. Pohl, IEEE Wireless Communications and Networking Conference (WCNC '04), vol. 4, Atlanta, GA, 2004, pp. 2075-2080.
• Optimal Length of the Training and Data Phase in Continuous Flat Fading MIMO Channels
  V. Pohl, V. Jungnickel, and C. v. Helmolt, IEEE Intern. Conf. on Commun. (ICC), vol. 6, Paris, France, June 2004, pp. 3153-3157.
• A multicode space-frequency RAKE receiver
  H. Chen, V. Jungnickel, V. Pohl, and C. v. Helmolt, 38th Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, Nov. 2004.
• How Often Channel Estimation is Needed in MIMO Systems
  V. Pohl, P. Nguyen, V. Jungnickel, and C. v. Helmolt, IEEE Global Telecommun. Conf. (GLOBECOM), vol. 2, San Francisco, CA, USA, Dec. 2003, pp. 814-818.
• The Effect of Path Loss Variations on the Capacity of MIMO Systems
  V. Pohl, V. Jungnickel, T. Haustein, and C. v. Helmolt, European Personal Mobile Commun. Conf. (EPMCC), Glasgow, UK, Apr. 2003, pp. 458-462.
• Limits of the Achievable Symbol Rate in Flat Fading MIMO Systems
  V. Pohl, P. Nguyen, V. Jungnickel, and C. v. Helmolt, Proc. 14th IEEE Intern. Symposium on Personal, Indoor and Mobile Radio Commun. (PIMRC), vol. 3, Bejing, China, Sept. 2003, pp. 2548-2552.
• Link adaptation in a multi-antenna system
  V. Jungnickel, T. Haustein, V. Pohl, and C. v. Helmolt, IEEE 57thVehicular Technology Conference (VTC 2003-Spring), vol. 2, Jeju Island, Korea, Apr. 2003, pp. 862 - 866.
• Experiments on the element spacing in multi-antenna systems
  V. Jungnickel, V. Pohl, and C. v. Helmolt, IEEE 57th Vehicular Technology Conference (VTC 2003 Spring), Jeju Island, Korea, Apr. 2003, p. 1124–1126.
• Over-the-air demonstration of spatial multiplexing at high data rates using real-time base-band processing
  V. Jungnickel, A. Forck, T. Haustein, U. Krueger, V. Pohl, and C. v. Helmolt, Kleinheubacher Tagung, Miltenberg, DE, 2003, INVITED PAPER.
• On the performance of signal detection algorithms in flat-fading and frequency-selective MIMO channels
  E. Jorswieck, V. Jungnickel, T. Haustein, V. Pohl, and C. v. Helmolt, IEEE 55th Vehicular Technology Conference (VTC Spring-2002), Atlantic City, May 2002, pp. 40-44.
• Zero Forcing Equalizing Filter for MIMO Channels with Intersymbol Interference
  V. Pohl, V. Jungnickel, E. Jorswieck, and C. v. Helmolt, IEEE Intern. Symposium on Personal, Indoor and Mobile Radio Commun. (PIMRC), Lissabon, Portugal, sept 2002, pp. 1037-1041.
• Antenna Spacing in MIMO Indoor Channels
  V. Pohl, V. Jungnickel, T. Haustein, and C. v. Helmolt, IEEE Veh. Technol. Conf. (VTC), vol. 2, Birmingham, USA, May 2002, pp. 749-753.
• High capacity antennas for MIMO radio systems
  V. Jungnickel, V. Pohl, H. Nguyen, U. Kruger, T. Haustein, and C. v. Helmolt, 5th Int. Symp. Wireless Personal Multimedia Communications (WPMC'02), Honolulu, Hawaii, Oct. 2002, pp. 407-411.
• Performance of a MIMO System with Overlay Pilots
  V. Jungnickel, T. Haustein, E. Jorswieck, V. Pohl, and C. v. Helmolt, IEEE Globecom 2001, San Antonio, TX , Nov. 2001.
• A radio system with multi-element antennas
  V. Jungnickel, V. Pohl, U. Krüger, C. v. Helmolt, T. Haustein, and S. Stanczak, IEEE Semiannual Vehicular Technology Conference (VTC Spring 2001), Rhodes Island, Greece, May 2001.
• Wireless Infrared Communications Beyond 100 Mbit/s: System Design, Transmission Experiments and Potential
  V. Jungnickel, A. Forck, T. Haustein, U. Krüger, V. Pohl, and C. v. Helmolt, 5th World Multiconference on Systemics, Cybernetics and Informatics, Orlando, FL, 2001, pp. 413-420, INVITED PAPER.
• Bit Error Rates for a MIMO System in Rayleigh and Rician Channels
  T. Haustein, E. Jorswieck, V. Jungnickel, U. Krueger, V. Pohl, and C. v. Helmolt, 54rd Vehicular Technology Conference (VTC-Fall '01), Atlantic City, NJ, Oct. 2001.
• A Channel Model for Wireless Infrared Communication
  V. Pohl, V. Jungnickel, and C. v. Helmolt, 11th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication (PIMRC' 00), London, U.K., 2000.