Prof. Dov Wulich
Born: 1949, Poland
Academic Qualifications:
    Ph.D. , 1982, Ben Gurion University, Electircal Engineering
Academic Positions:
Department of Electrical and Computer Engineering - Professor

Research Interests:
Communications, Signal Processing
Research Projects:
Theoretical with computer modeling or simulation
Abstracts of Current Research:
  • 1. Data Transmission Trough Multipath and Fading Channels Using OFDM: Orthogonal Frequency Division Multiplexing (OFDM) has been found to be a very effective method for data transmission in channels with fading and multipath.
    The main disadvantage is that OFDM exhibits a high Peak to Average Power Ratio (PAPR). Because of this all circuits between the output of the modulator and the input of the demodulator must be linear within a large dynamic range to avoid distortions and spectral spreading. It is therefore desirable to limit the PAPR of the OFDM signal.
    The capacity and data throughput of the OFDM system with reduced PAPR is investigated taking into account the power efficiency of the linear power amplifier.
  • 2. Data transmission using multiple antenna array: Use of multiple antenna at receiver, transmitter or both may increase the total capacity of the channel. The main problem associated with practical use of antenna array is knowledge of the transfer matrix of the channel. This knowledge may be obtained by transmitting a special testing signals, simultaneously or separately with the information carrying signal, through the channel and then estimating the channel parameters by analyzing the output signal. Various methods to estimate the channel as well as closed loop architecture are investigated.
Publications:
  • G. R. Tsouri and D. Wulich. Capacity Analysis and Optimization of OFDM with PAPR Reduction European Transactions on Telecommunications 19: (2008)
  • D. Wulich, L. Goldfeld. Distribution of Instantaneous Power in Single Carrier Modulation IEEE Trans. on Wireless Commun 4: 1773-1778 (2005)
  • G. R. Tsouri and D. Wulich. Selection Combining Upgrade Schemes for Mobile Units in Wireless Networks WSEAS Trans. on Communication : (2005)
  • D. Wulich. Definition of Efficient PAPR in OFDM IEEE Communications Letters 9: 832-834 (2005)
  • L. Goldfeld, D. Wulich. Adaptive Diversity Reception System for Rayleigh Fading Channel European Transactions on Telecommunications 14: 367-372 (2003)
  • L. Goldfeld, V. Lyandres, D. Wulich. Minimum BER power loading for OFDM in fading channels IEEE Trans. on Commun 50: 1729-1733 (2002)
  • D. Wulich, L. Goldfeld. On the transmission of a wideband signal through a narrowband channel European Transactions on Telecommunications 12: (2001)
  • N. Dinur, D. Wulich. Peak to average ratio in high order OFDM IEEE Trans. on Commun 49: 1063-1072 (2001)
  • L. Goldfeld, D. Wulich. Multichannel system with optimal diversity reception and erasures-correction decoder for Rayleigh fading channel IEEE Trans. on Commun 48: 1979-1982 (2000)
  • L. Goldfeld, D. Wulich. Multicarrier modulation with multistage encoding/decoding for Nakagami fading channels European Transactions on Telecommunications 11: (2000)
  • D. Wulich. Comments on the peak factor of a sampled and continuous signals IEEE Communications Letters 4: 213-214 (2000)
  • D. Wulich, N. Dinur, A. Gilinowiecki. Level clipped high order OFDM IEEE Trans. on Commun 48: 928-930 (2000)
  • D. Wulich, L. Goldfeld. Reduction of peak factor in orthogonal multicarrier modulation by amplitude limiting and coding IEEE Trans. on Commun 47: 18-21 (1999)
  • D. Wulich, A. Geva. On a periodic training sequence in DFE to reduce the steady state error probability IEEE Trans. on Commun 47: 1288-1292 (1999)
  • L. Goldfeld, D. Wulich. Multicarrier modulation system with erasures-correcting decoding for Nakagami fading channels European Transactions on Telecommunications 8: 591-596 (1997)
  • L. Goldfeld, D. Wulich. Performance of an MPSK correlation demodulator with decision feedback carrier recovery in the presence of a speech signal Signal Processing 61: 225-235 (1997)
  • L. Goldfeld, V. Lyandres and D. Wulich. ARQ with erasures correction in the frequency- nonselective fading channel IEICE Trans. Commun E80-B: 1101-1103 (1997)
  • D. Wulich. Reduction of peak to mean ratio of multicarrier modulation using cyclic coding Electronics Letters 32: 432-433 (1996)
  • D. Wulich. Peak factor in orthogonal multicarrier modulation with variable levels Electronics Letters 32: 1859-1860 (1996)
  • L. Goldfeld, D. Wulich. A calculation of the capacity of a twisted-wire pair Signal Processing 41: 391-393 (1995)
  • D. Wulich and L. Goldfeld. Capacity of voiceband channel with speech signal interference Electronics Letters 16: 1275-1276 (1994)
  • L. Goldfeld, D. Wulich. Performance of correlation demodulator in the presence of speech signal Signal Processing 35: 41-50 (1994)
  • S. Ben-Yaakov, D. Wulich and W. Polivka. Resolution of an averaging paradox in the analysis of switched mode dc-dc converters IEEE Trans. on AES 30: 626-632 (1994)
  • D. Wulich. Time-varying analog constrained filter Int. J. of Circuit Theory and Applications 21: 35-40 (1993)
  • D. Wulich. Hilbert transform of constant envelope signal using time-warping technique Signal Processing 31: 97-101 (1993)
  • D. Wulich, M. Bukris. Data over voice using time-warping technique Signal Processing 34: 99-108 (1993)
  • D. Wulich, E.I. Plotkin, M.N.S. Swamy and Wen Tong. PLL synchronized time-varying constrained notch filter for retrieving of a weak multiple sine signal jammed by FM interference IEEE Trans. on Signal Processing 40: 2866-2670 (1992)
  • D. Wulich, E.I. Plotkin, M.N.S. Swamy. Constrained notch filtering of nonuniformly spaced samples for enhancement of an arbitrary signal corrupted by a strong FM interference IEEE Trans. on Signal Processing 39: 2359-2363 (1991)
  • D. Wulich, M. Bar, O. Kost. Fast frequency synthesis based on PLL and continuous phase divider Int. J. of Electronics 70: 891-899 (1991)
  • D. Wulich, M. Bar. The convergence of a PLL with variable parameters Int. J. of Circuit Theory and Applications 18: 135-143 (1990)
  • D. Wulich, E.I. Plotkin, M.N.S. Swamy. Stability of second order time-varying constrained notch filters Electronics Letters 26: 1508-1509 (1990)
  • D. Wulich, E.I. Plotkin, M.N.S. Swamy. Discrete time-varying filter and PLL for synchronous estimation of parameters of a sine signal corrupted by a closely spaced time varying interference Signal Processing 21: 183-194 (1990)
  • D. Wulich, E.I. Plotkin, M.N.S. Swamy. An analysis of CCPLL behaviour in the presence of noise Int. J. of Circuit Theory and Applications 18: 319-323 (1990)
  • D. Wulich, E.I. Plotkin, M.N.S. Swamy. Synthesis of discrete time-varying null filters for frequency-varying signals using time-warping technique IEEE Trans. on Circuit and Systems 37: 977-990 (1990)
  • D. Wulich. Fast frequency synthesis by PLL using a continuous phase divider Proceedings of IEEE 76: 85-86 (1988)
  • D. Wulich, E.I. Plotkin, M.N.S. Swamy and E. Kashi. Modified CCPLL for demodulation of two FM signals with overlapping spectra Electronics Letters 24: 1588-1590 (1988)
  • D. Wulich, N.S. Kopeika. Image resolution limits resulting from mechanical vibrations Optical Engineering 26: 529-533 (1987)
  • D. Wulich, D. Yardeni. Mode detector of SSB radio Signal Processing 13: 301-308 (1987)
  • D. Wulich, J. Kauffman. Order estimation of time invariant linear system J. of the Franklin Institute 322: 143-150 (1986)
  • J. Grossman, D. Wulich, U. Mahleb. Large signal analysis of sampled PLL Electronics Letters 22: 156-158 (1986)
  • B.Z. Kaplan, M. Rolnick, D. Wulich. A new fast-response double phase-locked loop Proceedings of IEEE 74: 368-369 (1986)
  • D. Wulich. Phase locked loop based frequency adder Signal Processing 10: 245-252 (1986)
  • L. Kazovsky, D. Wulich, E. Turgeman. Adaptive suppress of impulse noise Int. J. of Circuit Theory and Applications 12: 51-60 (1984)
  • D. Wulich. Mean estimation of random process with aid of ON-OFF detectors IEEE Trans. on Instrumentation and Measurement IM-33: 75-78 (1984)
  • D. Wulich. Noise variance measurement with presence of strong burst interference J. of the Franklin Institute 317: 135-145 (1984)
  • D. Wulich, H. Aharoni. Zero distortion in negative feedback amplifiers IEEE Trans. on Education E-27: 243-245 (1984)
  • D. Wulich. Speed control by phase locked loop used as a frequency synthesizer IEEE Trans. on Industrial Electronics IE-31: 391-393 (1984)
  • D. Wulich, L. Kazovsky. Accuracy of optical angle estimation operating through the turbulent interference Applied Optics 4: 33-44 (1983)
  • D. Wulich. A generation of Poisson stream and its engineering applications Int. J. of Circuit Theory and Applications 11: 363-370 (1983)
  • E. Plotkin, D. Wulich. A comparative study of two algorithms for suppression of narrow band interference Signal Processing 4: 35-44 (1982)
  • E. Plotkin, D. Wulich, . On estimation of noise variance in the presence of a narrow-band signal IEEE Trans. on Instrumentation and Measurement IM-30: 74-76 (1981)
  • E.I. Plotkin, D. Wulich. An adaptive linear function elimination filter Int. J. of Electronics 47, No. 4, pp., : 355-364 (1979)
Keywords:OFDM, PAPR, MIMO.
Phones:
  1. Phone: 972-8-6472416
Email:dov@ee.bgu.ac.il