Murat Torlak
Dept. of Electrical Engineering
The University of Texas at Dallas
Dallas, TX 75083

E-mail: torlak@utdallas.edu
Web: http://www.utdallas.edu/~torlak
Work: +1-972-883-4624

Research Areas

Education

Experience

Awards

Professional Societies

Refereed Journal Articles

Refereed Conference Papers

Oral Presentations

Computer Skills

Research Areas

Education

Experience

    Conducting an experimental research and education program in wireless communication systems. Teaching various undergraduate and graduate courses in wireless communications/real-time DSP. Director of Wireless Information Systems Lab. and Co -director of UTD-SMU Antenna Measurement Lab.

    Taught Introduction to Wireless Communications Systems and Signaling and Coding for Wireless Communications Systems (graduate courses) which cover principle, practice, system overview of mobile systems, modulation,demodulation, coding, encoding, multiple-access techniques., and performance characterization of mobile systems. Taught Probability and Random Processes and Signals and Systems (undergraduate courses).

    Developed a new course: DSP-Based Design Project (senior design project course) trains students in digital communications systems, real-time digital signal processing algorithms, and programmable digital signal processors. Students design and build DSP-based systems in software using a digital signal processing board and tools.

    Developed theory, fast algorithms, and multi-user channel and symbol estimation algorithms for wireless communications applications. Applications include TDMA, W-CDMA, MC-CDMA, and smart antenna systems.

AWARDS

1998 Texas Telecommunications Engineering Consortium (TxTEC) Fellowship

MEMBERSHIPS IN PROFESSIONAL SOCIETIES

Senior Member, Institute of Electrical and Electronics Engineers (IEEE)

Member in three IEEE Societies: Signal Processing, Communications, Information Theory

REFEREED JOURNAL ARTICLES

  1. D. Kim and M. Torlak, "Optimization of Interference Alignment Beamforming Vectors," IEEE Journal on Selected Areas in Communications, vol. 28, no. 9, Dec. 2010.
  2. A. Morshedi and M. Torlak,  "Measured Comparison of Dual-Branch Signaling over Space and Polarization Diversity,” , to appear, IEEE Trans. On Antennas and Propagation.
  3. S. Ciftci and M. Torlak,  “A Comparison of Energy Detectability Models for Cognitive Radios in Fading Environments,” , accepted with minor revisions, Wireless Personal Communications, May 2009.
  4. O. Ozdemir and M. Torlak, “ Optimum Feedback Quantization for an Opportunistic Beamforming Scheme,” IEEE Trans. on Wireless Communications , vol 9, no. 5, pp. 1584-1593, May 2010.
  5. O. Jegbefume, M. Saquib and M. Torlak  “ Performance Analysis of Spread Spectrum Protocols with Adaptive Spreading,” , IEEE Transactions on Wireless Communications , vol. 9, no. 3, March 2010, pp. 1063-1073.
  6. O. Ozdemir and M. Torlak,  “Opportunistic Beamforming over Rayleigh Channels with Partial Side Information,” IEEE Trans. On Wireless Communications, vol. 7, No. 9, pp. 3417-3427, Sept. 2008.
  7. A. Kavak, M. Karakoç, M. Torlak, C. Ozdemir, “Interference analysis and capacity for forward link 3G CDMA network with adaptive antennas”, Wireless Communications and Mobile Computing, vol. 8, no. 4, pp. 531-543, May 2008.
  8. D. Paik, R. M. Golden, M. Torlak, and E. M. Dowling, “Space-Time Blind Adaptive Processing with Block Shanno Constant Modulus Algorithm”, IEEE Trans. on Signal Processing , vol. 54, no. 5, pp. 1956-1959, May 2006
  9. M. Z. Ali and M. Torlak, “Packet Combining with Adaptive Retransmission Control in DS-CDMA Random Access Networks,” IEEE Communications Letters, vol. 8, no. 11, pp. 659 – 661, Nov. 2004.
  10. O. Ozdemir and M. Torlak, “Reduced-Rank RAKE receivers for asynchronous CDMA Signals,” Signal Processing , vol. 84, no. 8, pp. 1385-1394, August 2004.
  11. A. T. Koc, O. Ozdemir, and M. Torlak, “Simulation Based Study of Random Access CDMA Networks,” Journal of Naval Science and Engineering, vol. 2, no. 2, pp. 49-76, July 2004 (invited paper).
  12. M. Torlak, “Performance of Beamspace Transmit Diversity Technique in Two Beam Rayleigh Fading Channels”,  International Journal of Wireless Personal Communications, pp. 277-286, vol. 28, no. 4, March 2004.
  13. A. Kavak, M. Torlak, W. J. Vogel, and G. Xu, "Vector Channels for Smart Antennas: Measurements, Statistical Modeling, and Directional Properties in Outdoor Environments," IEEE Trans. on Microwave Theory and Techniques, vol: 48, no: 6, pp. 930 -937, June 2000.
  14. M. Torlak, L. K. Hansen, and G. Xu.``A geometric approach to blind source separation for digital wireless applications,'' Signal Processing, vol. 73, no: 1-2, pp. 153-167, Jan. 2000.
  15. M. Torlak, G. Xu, B. L. Evans, and H. Liu, ``Fast Estimation of Weight Vectors to Optimize Multi-Transmitter Broadcast Channel Capacity,'' IEEE Transactions on Signal Processing, vol. 46, no. 1, pp. 243-246, Jan. 1998.
  16. M. Torlak and G. Xu. ``Blind multiuser channel estimation in asynchronous CDMA systems,'' IEEE Trans. on Signal Processing, vol. 45, no: 1, pp. 137-147, Jan. 1997.

REFEREED CONFERENCE PAPERS

  1. J. Yuan, M. Torlak, and M. Mishra, "Co-design of Sensing and Random Multiple Access for Cognitive Radios," submitted, Sept. 2011, Proc. IEEE International Conf. on Communications, Tokyo, Japan.
  2. D. Kim and M. Torlak, "Interference Alignment via Improved Subspace Conditioning," Proc. IEEE Globecom Conf, Miami, FL, Dec 6-10, 2010 ( arXiv:1011.6644 ).
  3. "M. Torlak, S. Shearman, J. Yuan, and D. Kim, "A Real-Time Algorithm Design and Prototyping Platform for Single- / Multi-User MIMO Research," SDR Forum Technical Conf., Washington, D.C, Dec. 2, 2010.
  4. A. Koc and M. Torlak, "Performance of Hybrid ARQ in Block Fading Multiantenna Channels," Proc. IEEE Veh. Tech. Conf-Spring, 16-19 May 2010, pp. 1-5, Taipei, Taiwan.
  5. D. Kim, V.Gopalakrishna, S. Guo, H. Lee, M. Torlak, N. Kehtarnavaz, A. Lobo, and P. Loizou, "On the Design of a Flexible Stimulator for Animal Studies in Auditory Prostheses," Proc. Int. Symposium on Applied Sciences in Biomedical and Comm. Tech., Bratislava, Slovak Republic, Nov 24-27, 2009, pp. 1-5.
  6. S. Ozyurt and M. Torlak, "Outage and Diversity Analysis of Opportunistic Beamforming over Rayleigh Channels," Proc. IEEE Global Communications Conf., Honolulu, Hawaii, Nov. 30-Dec 4., 2009
  7. S. Ciftci and M. Torlak, "A Comparison of Energy Detectibility Models for Spectrum Sensing," Proc. IEEE Global Telecom. Conf., pp. 1-5, Nov. 30-Dec. 4 2008, New Orleans, LO
  8. A. Morshedi and M. Torlak, "Experimental Investigation of Polarization Diversity," Proc. IEEE Sensor Array and Multichannel Signal Processing Workshop, pp. 13-17, July 21-23, 2008, Darmstadt, Germany.
  9. D. Kim and M. Torlak, "Rapid Prototyping of a Cost Effective and Flexible 4x4 MIMO Testbed," Proc. IEEE Sensor Array and Multichannel Signal Processing Workshop, pp. 5-8, July 21-23, 2008, Darmstadt, Germany.
  10. O. Jegbefume, M. Saquib, and M. Torlak, "Artificial Code Puncturing for Wireless Networks," Proc. IEEE of Wireless Communications and Networking Conf., pp. 3181-3185, March 31 - April 03, 2008, Las Vegas, NV.

  11. A. Lobo, P. Loizou, N. Kehtarnavaz, M. Torlak, H. Lee, A. Sharma, and P. Gilley, V. Peddigarri, L. Ramanna, "A PDA-based Research Platform for Cochlear Implants," Proc. IEEE EMBS Conference on Neural Engineering, 2 -5 May, 2007, in Kohala Coast, Hawaii, USA.

  12. O. Ozdemir and M. Torlak,  “Performance of Opportunistic Beamforming with Quantized Feedback,”  Proc. IEEE Globecom Conf., San Francisco, CA, Nov. 2006.

  13. B. Kecicioglu, O. Ozdemir, and M. Torlak, “Opportunistic Multiple Antenna Systems: Channel Estimation and Experimental Results,”  Proc. IEEE International Conf. On Communications, June 11-15 2006, Istanbul, Turkey.

  14. O. Ozdemir, M. Torlak, and N. Al-Dhahir, “Large System Analysis of Hybrid Channel Estimation Methods in CDMA Systems,”  Proc. IEEE Veh. Tech. Conf.-Fall, pp. 1988 – 1992, 25-28 Sept. 2005, Dallas, TX.

  15. B. Kececioglu, M. Torlak, A. Kavak, "Performance of Optimum Combining with Channel Estimation Errors,”  Proc. IEEE Veh. Tech. Conf.-Fall, pp. 2230 - 2234, 25-28 Sept. 2005, Dallas, TX.

  16. O. Ozdemir and M. Torlak, “Opportunistic Beamforming with Partial Channel State Information,” Proc. IEEE International Conf. On Communications, June 11-15, 2006, Istanbul, Turkey.

  17. A. T. Koc, O. Ozdemir, and M. Torlak, “Reduced Rank  Noncohenerent Interference Suppression for CDMA Communications,”  Proc.  IEEE Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, Nov. 7-11, 2004.

  18. B. Kecicioglu and M. Torlak, "Reduced Rank Beamforming Methods for SDMA/OFDM Communications,”  Proc.  IEEE Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, Nov. 7-11, 2004.

  19. O. Ozdemir and M. Torlak, “Performance of Blind Channel Estimation without Eigenvalue Decomposition,” Proc. IEEE Global Telecommunications Conf., Dec. 2004, Dallas, Texas.

  20. M. Z. Ali and M. Torlak,  “Adaptive Retransmission and Error Control in DS-CDMA Random Access Networks,”  Proc. IEEE Global Telecommunications Conf.., December, 2004,  Dallas, Texas.

  21. O. Ozdemir and M. Torlak, “Blind Channel Estimation without Eigenvalue Decomposition,”  Proc. IEEE International Conf. On Communications, June 20-24 2004, Paris, France.

  22. M. Z. Ali and M. Torlak, “Joint Processing of Packet Combining and Adaptive Retransmission Control in DS-CDMA Random Access Networks," Proc. IEEE Wireless Communications and Networking Conf., March 21-25,2004,  Atlanta, Georgia.

  23. M. Z. Ali and M. Torlak, "Adaptive Retransmission Control in DS-CDMA Random Access Networks," , Proc. Cellular and Intelligent Communications, Oct. 28-31,2003, Seoul, Korea.

  24. A. T. Koc and M. Torlak, “Concatenated Beamspace-Time Coding for Directional Wireless Channels,” , in Proc. IEEE Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, Nov. 3-6, 2002.

  25. M. Torlak and O. Ozdemir, “A Krylov Subspace Approach to Blind Channel Estimation for CDMA Systems,” in Proc.  IEEE Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, Nov. 3-6, 2002.

  26. M. Z. Ali and M. Torlak, “Retranmission Optimization CDMA Random Access Networks”, in Proc. Military Communications Conf., Anaheim, CA, Oct. 7-10, 2002.

  27. Ali T. Koc, O. Ozdemir, M. Torlak, and W. P. Osborne, "OPNET Simulation of Random Access CDMA Networks",  in Proc. OPNETWORK 2002, Washington D.C. August 2002.

  28. O. Ozdemir and M. Torlak,  “Reduced-Rank Advanced RAKE Receivers for Dispersive CDMA Signals,”  in Proc. IEEE Veh. Tech. Conf., Atlantic City, May 30, 2002.

  29. M. Torlak,  “An Analytical Blind Multiuser Detection for CDMA Signals,” in Proc. IEEE Global Comm. Conf., pp. 240-243, San Antonio, TX, Nov. 25-29, 2001.

  30. O. Ozdemir and M. Torlak, “A reduced rank decorrelating RAKE receiver for CDMA communications over frequency selective fading,” in Proc. IEEE Statistical Signal Processing Workshop, August, 2001, Singapore.

  31. O. Ozdemir and M. Torlak, “Reduced rank multistage Wiener filtering of dispersive CDMA signals,”  in Proc. World Multiconf. On Systemics, Cybernetics and Informatics and Int. Conf. On Information Sys. An. And Syn., vol. 4, pp. 537-541, July, 2001, Orlando, FL (Recipient of the Best Paper Award).

  32. A. Kavak, M. Torlak, G. Xu and W. J. Vogel, " Mobile transmit diversity and TDD downlink performance for smart antennas in fast fading scenarios," Proc. IEEE Antennas and Prop. Int. Symp. and USNC/URSI National Radio Sci. Meeting , July 16-21, 2000, Salt Lake City, Utah.

  33. M. Torlak and B. L. Evans, " A self recovering RAKE recever for asynchronous CDMA systems," Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, June 5-9, 2000, Istanbul, Turkey.

  34. M. Torlak, S. Y. Kim, J. Kang, H. Li, and G. Xu, " Performance of MC-CDMA systems using antenna arrays, " Proc. IEEE Asilomar Conf. On Signals, Systems, and Computers, vol. 1, pp. 179 -182, Oct. 25-28, 1999, Pacific Grove, CA.

  35. A. Kavak, M. Torlak, W. J. Vogel, and G. Xu, "Vector propagation channels for smart antenna systems: Statistical properties of spatial signature variation in outdoor environments " Proc. IEEE Radio and Wireless Conf. , pp. 171 -174, Aug. 1-4, 1999, Denver, CO.

  36. M. Torlak, S.-Y. Kim, and Guanghan Xu, "A capacity measure for space-division-multiple-access channels," Proc. IEEE Asilomar Conf. On Signals, Systems, and Computers, vol. 1, pp. 790-794, Nov. 1-4, 1998, Pacific Grove, CA.

  37. M. Torlak, L. K. Hansen, and G. Xu, ``A fast blind source separation for digital wireless applications,'' In Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, vol. 6, pp. 3305-3308, May 1998, Seattle, WA.

  38. M. Torlak, B. L. Evans, and G. Xu, ``Blind Estimation of FIR Channels in CDMA Systems with Aperiodic Spreading Sequences'', Proc. IEEE Asilomar Conf. on Signals, Systems, and Computers, vol. 1, pp. 495-499, Nov. 3-5, 1997, Pacific Grove, CA.

  39. M. Torlak, L. K. Hansen, and G. Xu, ``A fast blind sequence estimation in digital communications,'' Proc. IEEE Asilomar Conf. on Signals, Systems and Computers, vol. 1, pp. 833-837, Nov. 2-5, 1997, Pacific Grove, CA, Nov. 1997.

  40. M. Torlak and G. Xu, ``Minimum distance of space-division-multiple-access channels,'' Proc. IEEE Vehicular Technology Conference, vol. 3, pp. 2223-2227, May 4-7, 1997, Phoenix, AZ.

  41. M. Torlak, G. Xu, B. L. Evans, and H. Liu, ``Estimation of optimal weight vectors for spatial broadcast channels,'' In Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, vol. 5, pp. 4009-4012, Apr. 21-24, 1997, Munich, Germany.

  42. M. Torlak and G. Xu, ``Maximum likelihood detection of co-channel communication signals exploiting the spatio-temporal diversity,'' In Proc. IEEE Asilomar Conf. on Signals, Systems and Computers, vol. 1, pp. 728-732, Nov. 3-6, 1996, Pacific Grove, CA

  43. M. Torlak, G. Xu, B. L. Evans, and H. Liu, ``Optimal weight vectors for broadcast channels,'' In Proc. IEEE Asilomar Conf. on Signals, Systems and Computers, vol. 1, pp. 65-69, Nov. 3-6, 1996, Pacific Grove, CA.

  44. M. Torlak, H. Liu, and G. Xu, ``An improved signature waveform approach exploiting pulse shaping information in synchronous CDMA systems,'' In Proc. IEEE Int. Conf. on Communications, vol. 2, pp. 823-827, June 23-27, 1996, Dallas, TX.

  45. M. Torlak, G. Xu, and H. Liu, ``A self-recovery scheme in anti-jamming communications,'' Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, vol. 5, pp. 2567-2570, Apr. 28-May 1, 1996, Atlanta, GA.

  46. M. Torlak, H. Liu, and G. Xu, ''An improved signature waveform estimation approach in synchronous CDMA systems,'' Proc. IEEE Vehicular Technology Conf., vol. 1, pp. 569-573, April 1996, Atlanta, GA.

  47. M. Torlak and G. Xu. ``Performance of CDMA smart antenna systems,'' Proc. IEEE Asilomar Conf. on Signals, Systems, and Computers, vol. 1pp. 383-387, Oct. 30-Nov. 2, 1995, Pacific Grove, CA.

ORAL PRESENTATIONS

  • July 23, 2004, “Design Trade-offs in Multiple Antenna Uplink OFDM Systems,” Texas Instruments, Inc. Dallas, TX

  • Feb. 23, 2004, “Smart Antennas for Wireless Communications,” UTD Day at TI, Texas Instruments, Inc. Dallas, TX

  • Dec. 17, 2003, “Beamforming for Wireless Communications with Applications to Cellular OFDM,” UTD/TI meeting, Richardson, TX

  • August 2002, “OPNET Simulation of Random Access CDMA Networks,” OPNETWORK 2002, Washington, D.C.

  • June, 2002, “Beam-Space Time Coding for Wireless Communications,” Texas Instruments, Inc., Dallas, TX

  • September 19, 2001, “Smart Antennas for Wireless Communications,” IEEE Microwave Theory and Techniques (MTT) Chapter Meeting, Dallas, TX,

  • Aug. 6, 2001, “A Reduced Rank Decorrelating RAKE Receiver for CDMA Communications over Frequency Selective Fading,” IEEE Statistical Signal Processing Workshop, Singapore,

  • Feb. 8, 2001,  “Low Complexity Receivers for CDMA Communications,” Texas Instruments, Inc., Dallas, TX

  • Nov. 18, 2000, “Blind Multiuser Detection for CDMA Signals in Multipath Channels,” Texas Systems Day 2000, Austin, TX

  • Feb. 9, 2000, “Signal Processing Solutions for Advanced Wireless Networks and Telecommunications,” LSI Logic, Plano, TX

  • June 9, 2000, "A self-recovering RAKE recever for asynchronous CDMA systems," IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, Istanbul, Turkey.

  • September 11, 1999, "Blind channel estimation techniques for CDMA systems," Texas System Day, College Station, TX.

  • June 7, 1999, "Blind channel estimation techniques for CDMA systems," University of Illinois at Chicago, Chicago, IL.

  • May 3, 1999, "Signal processing for next-generation wireless communication systems," University of Texas at Dallas, Dallas, TX.

  • April 16, 1999, "Signal processing for next-generation wireless communication systems," University of Utah, Salt Lake City, UT.

  • April 2 , 1999, "Signal processing for next-generation wireless communication systems," University of Massachusetts, Amherst, MA.

  • March 7, 1999, "Signal processing for next-generation wireless communication systems," Duke University, Durham, NC.

  • November 2, 1998, "A capacity measure for space-division-multiple-access channels," IEEE Asilomar Conf. On Signals, Systems, and Computers, Pacific Grove, CA.

  • October 26, 1998, "Array Signal Processing," ; UT Austin, Signal and Image Processing Seminar, The University of Texas at Austin, Austin, TX.

  • October 15, 1998, "Signal Processing for Wireless Basestations", Wireless Communications Laboratory Seminar, Texas A&M University, College Station, TX.

  • June 15, 1998, "Estimation and Capacity of Channels in Smart Antenna Wireless Communication Systems," Signal and Image Processing Seminar, The University of Texas at Austin, Austin, TX.

  • November 2, 1996,``Optimal weight vectors for broadcast channels,'' IEEE Asilomar Conf. on Signals, Systems and Computers, Pacific Grove, CA.

  • November 2, 1996,``Maximum likelihood detection of co-channel communication signals exploiting the spatio-temporal diversity,'' IEEE Asilomar Conf. on Signals, Systems and Computers, Pacific Grove, CA

  • June 24, 1996, ``An improved signature waveform approach exploiting pulse shaping information in synchronous CDMA systems,'' IEEE Int. Conf. on Communications, Dallas, TX.

  • May 8, 1996, ``A self-recovery scheme in anti-jamming communications,'' IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, Atlanta, GA.

  • January 17, 1996, "Performance of CDMA smart antenna systems," Southwestern Bell, Austin, TX.

  • November 1995, "Performance of CDMA smart antenna systems,'' IEEE Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA.

    COMPUTER SKILLS

    Mathematical languages: Mathematica, MATLAB

    Other high-level languages: C, C++, Pascal, Fortran

    Assembly languages: Texas Instruments TMS320C3X/C5X/C6X, Motorola 56000

    Design tools: Spice, SIMULINK

    Employed as Assembly Programmer

    Administered Unix Systems