Selected publications

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  1. M. Adeli and H. Liu, "Secure network coding with minimum overhead based on hash functions,", to appear in IEEE Communications Letters, 2009.
  2. F. Yildirim and H. Liu, "A cross-layer neighbor discovery algorithm for directional 60 GHz networks," IEEE Trans. on Vehicular Technology, vol. 58, no. 8, pp. 4598-4604, Oct. 2009.
  3. L.-N. Tran, E.-K. Hong, and H. Liu, "A frequency domain equalization algorithm for fast time-varying fading channels,"Journal of Communications and Networks, vol. 11, no. 5, pp. 474-480, Oct. 2009.
  4. J. He, Z. Wang, and H. Liu, "An efficient 4-D 8PSK TCM decoder architecture," to appear in IEEE Trans. on VLSI Systems, 2009.
  5. H. Liu, A. F. Molisch, D. Goeckel, and P. Orlik, "Hybrid coherent and frequency-shifted-reference ultrawideband radio," to appear in Physical Communication Journal, Special Issue on Advances in Ultra-Wideband Wireless Communications (invited paper), 2009.
  6. F. Yildirim, A. S. Sadri, and H. Liu, "Polarization effects for indoor wireless communications at 60 GHz," IEEE Communications Letters, vol. 12, no. 9, pp. 660-662, Sep. 2008
  7. L. Xian, R. Punnoose, and H. Liu, ``Simplified receiver design for STBC binary continuous phase modulation," IEEE Trans. on Wireless Communications, vol.7, no. 2, pp. 452-457, Feb. 2008.
  8. L.-N. Tran, E.-K. Hong, and H. Liu, "Two-stage hybrid decision feedback equalizer for DS-CDMA systems," IEEE Trans. on Wireless Communications, vol. 7, no. 5, pp. 1490-1494, May 2008.
  9. R. Khanna and H. Liu, "Control theoretic approach to intrusion detection using distributed hidden Markov model," IEEE Wireless Communications, vol. 15, no. 4, pp. 24-33, Aug. 2008.
  10. S. Zhao and H. Liu, ``Transmitter-side multipath preprocessing for pulsed UWB systems considering pulse overlapping and narrow-band interference,'' IEEE Trans. on Vehicular Technology, vol. 56, no. 6, pp. 3502-3510, Nov. 2007.
  11. T. Xu and H. Liu, ``Index assignment for beamforming with limited-rate imperfect feedback," IEEE Communications Letters, vol. 11, no. 11, pp. 865-867, Nov. 2007.
  12. Y. Zhang and H. Liu, ``MIMO-OFDM systems in the presence of phase noise and doubly-selective fading,'' IEEE Trans. on Vehicular Technology, vol. 56, no. 4, pp. 2277-2285, July 2007.
  13. T. Nguyen, D. Nguyen, H. Liu, and D. Tran, ``Stochastic binary sensor networks for noisy environments," International Journal of Sensor Networks, vol. 2, no. 5/6, pp. 414-427, 2007.
  14. S. Zhao, P. Orlik, A. F. Molisch, H. Liu, and J. Zhang, "Hybrid ultrawideband modulations compatible for both coherent and transmit-reference receivers," IEEE Trans. on Wireless Communications, vol. 6, no. 7, pp. 2551-2559, July 2007.
  15. Y. Zhang and H. Liu, ``Frequency-domain correlative coding for MIMO-OFDM systems over fast fading channels," IEEE Communications Letters, vol. 10, pp. 347-349, May 2006.
  16. R. Khanna, H. Liu, H.-H. Chen, ``Self-organization of sensor networks using genetic algorithms," International Journal of Sensor Networks, vol. 1, no. 3/4, pp. 241-252, 2006.
  17. Y. Zhang and H. Liu, ``Impact of time selective fading on the performance of quasi-orthogonal space-time coded OFDM systems," IEEE Trans. on Communications, vol. 54, no. 2, pp. 251-260, Feb. 2006.
  18. J. Gao and H. Liu, "Low-complexity MAP channel estimation for mobile MIMO-OFDM systems," IEEE Trans. on Wireless Communications, vol. 7, no. 3, pp. 774-780, Mar. 2008.
  19. J. Gao, O. C. Ozdural, S. Ardalan, and H. Liu, ``Performance modeling of MIMO OFDM systems via channel analysis,''  IEEE Trans. on Wireless Communications, vol. 5, pp. 2358-2362, Sep. 2006.
  20. H. Liu, "Multi-code ultra-wideband scheme using chirp waveforms," IEEE Journal on Selected Areas in Communications, vol. 24, pp. 885-891, April 2006.
  21. L. Xian and H. Liu, ``Optimal rotation angles for quasi-orthogonal space-time codes with PSK modulation," IEEE Communications Letters, vol. 9, pp. 676-678, Aug. 2005.
  22. Y. Zhang and H. Liu, ``Decision-feedback receiver for quasi-orthogonal space-time coded OFDM using correlative coding over fast fading channels,'' IEEE Trans. on Wireless Communications, vol. 5, pp. 3017-3022, Nov. 2006.
  23. R. Qiu, H. Liu, and X. Shen, ``Ultra-wideband for multiple-access communications,''  IEEE Communications Magazine, vol. 43, no. 2, pp. 80-87, Feb. 2005.
  24. S. Zhao, H. Liu, and Z. Tian, ``Decision directed autocorrelation receivers for pulsed ultra-wideband systems," IEEE Trans. on Wireless Communications, vol. 5, pp. 2175-2184, Aug. 2006.
  25. L. Xian and H. Liu, ``Space-time block codes from cyclic design,'' IEEE Communications Letters, vol. 9, no. 3, pp. 231-233, Mar. 2005.
  26. J. Cai, X. Shen, J.W. Mark, H. Liu, and T. D. Todd, "Semiblind channel estimation for pulse-based ultra-wideband wireless communication systems," IEEE Trans. on Vehicular Technology, vol. 55, pp. 95-103, Jan. 2006.
  27. S. Zhao and H. Liu, ``On the optimum linear receiver for impulse radio system in the presence of pulse overlapping,"  IEEE Communications Letters, vol. 9, no. 4, pp. 340-342, Apr. 2005.
  28. H. Liu, R. Qiu and Z. Tian, ``Error performance of pulse-based ultra-wideband MIMO systems over indoor wireless channels,'' IEEE Trans. on Wireless Communications, vol. 4, pp. 2939-2944, Nov. 2005.
  29. L. Xian and H. Liu, ``Exact error probability for space-time block coded MIMO systems over Rayleigh fading channels,'' IEE Proceedings-Communications, vol. 152, pp. 197-201, Apr. 2005.
  30. L. Xian and H. Liu, ``Rate one space-time block codes with full diversity,'' IEEE Trans. on Communications, vol. 53, pp. 1986-1990, Dec. 2005.
  31. H. Liu, Y. Song, and R. Qiu, ``The impact of fading correlation of the error performance of MIMO systems over Rayleigh fading channels,'' IEEE Trans. on Wireless Communications, vol. 4, pp. 2014-2019, Sept. 2005.
  32. S. Vemulapalli and H. Liu, ``A space-time-frequency coded multi-band ultra-wideband MIMO system,'' Dynamics of Continuous, Discrete and Impulse Systems - An International Journal for Theory and Applications (Series B), Special Issue on UWB,  vol. 12, no. 3, pp. 383-395, June 2005.
  33. M. E. Magana, W. Moranvil, and H. Liu, "A communication sytrem based on Walsh-Hadamard codes and constellations for fading environments," IEEE Trans. on Vehicular Technology, vol. 57, no. 3, pp. 1596-1605, May 2008.
  34. J. Gao and H. Liu, ``Decision-directed estimation of MIMO time-varying Rayleigh fading channels,'' IEEE Trans. on Wireless Communications, vol. 4, pp. 1412-1417, July 2005.
  35. H. Liu, ``High-rate transmission scheme for pulse-based ultra-wideband systems over dense multipath indoor channels,'' IEE Proceedings-Communications, vol. 152,  pp. 235-240, Apr. 2005.
  36. H. Liu, ``Error performance of a pulse amplitude and position modulated ultra-wideband system in lognormal fading channels,'' IEEE Communications Letters, vol.7, no. 11, pp.531-533, Nov. 2003.
  37. H. Liu, ``Interference and queuing delay based uplink packet access control in WCDMA systems,'' International Journal of Wireless Information Networks, vol. 10, no. 3, pp. 141-147, July 2003.
  38. H. Liu, V. Venkatasen, M. Magana, C. Nilsen, and R. Kyker, ``Performance of frequency hopped noncoherent GFSK in time-varying Rayleigh fading channels,'' International Journal on Wireless and Optical Communications, 2003, vol. 2, no. 1, pp. 51-61, June 2004.
  39. H. Liu and Z. Siveski, ``Fractionally sampled decorrelator for CDMA Rayleigh fading channels," IEE Electronics Letters, vol. 33, pp. 741-742, Apr. 1997.
  40. H. Liu and Z. Siveski, ``Differentially coherent decorrelating detector for CDMA single-path time-varying Rayleigh fading channels,'' IEEE Trans. on Communications, vol. 47, no. 4, pp. 590-597, Apr. 1999.
  41. H. Liu and J. Kong, ``Analysis of nonlinear sinusoidal oscillator using Volterra series,'' Telecommunication Engineering (in Chinese), vol. 31, pp. 7-10, Oct. 1991.
  42. Y. Zhou and H. Liu, ``Design of an IF wide-band endless phase shifter,'' Journal of Nanjing Institute of Posts and Telecommunications (in Chinese), vol. 8, pp. 73-80, Aug. 1988.
  43. H. Liu and J. Kong, ``Analysis of frequency pulling using Volterra series method,'' Journal of Electronics, vol. 14, pp. 306-310, Mar. 1992.
  44. J. Kong and H. Liu, ``Analysis of frequency and amplitude stability in sinusoidal feedback oscillators,'' Journal of Electronics, vol. 14, pp. 134-141, Feb. 1992.

Book chapters:

  1. R. Khanna, H. Liu, and H.H. Chen, "Energy efficient approach to dynamic clustering in sensor networks using genetic algorithm,'' Handbook on Sensor Networks, to appear, Editors, Y. Xiao, et al., World Scientific Publishing, Inc., 2009.
  2. H. Liu, "Error performance of pulsed ultrawideband systems in indoor environments," Ultra-Wideband Wireless Communications and Networks, Editors, S. Shen, et al., John Wiley & Sons, Inc., 2006.

Conference papers:

  1. G. Dong, Y. Li, N. Xie, T. Zhang, and H. Liu, "Candidate bit based bit-flipping decoding algorithm for low-density parity-check codes," in Proc. 2009 IEEE Int. Symp. Inform. Theory, Seoul, Korea, July 2009.
  2. R. Khanna, H. Liu, and H.-H. Chen, "Reduced complexity intrusion detection in sensor networks using genetic algorithm,"in Proc. IEEE ICC'09, June 2009, Dresden, Germany.
  3. K. Choi, D. Lim, and H. Liu, "Optimum power allocation for distributed antenna systems with large-scale fading-only feedback," in Proc. IEEE ITNG'09, April, 2009, Las Vegas, U.S.A.
  4. C. Hu, S. Redfield, H. Liu, R. Khanna, J. Nejedlo, and P. Chiang, "Transmitter equalization for multipath interference cancellation in impulse radio, ultra-wideband (IR-UWB) transceivers", in Proc. IEEE Int. Symp. VLSI Design, Automation, and Test, Apr. 2009, pp. 307–310.
  5. J. He, H. Liu, and Z. Wang, "A fast ACSU architecture for Viterbi decoder using T-algorithm," in Proc. 2009 Asilomar Conference on Signals, Systems, and Computers, 2009.
  6. J. He, Z. Wang, and H. Liu, "Low-complexity high-speed 4-D TCM decoder," in Proc. 2008 IEEE Workshop on Signal Processing Systems, Washington D.C., Oct., 2008.
  7. R. Whang, H. Liu, and E.-K. Hong, "Transmission pattern selection for relay communication with distributed space-time codes,"in Proc. 11th IEEE International Conference on Communication Systems, Guangzhou, China, Nov. 2008.
  8. R. Khanna, H. Liu, H. H. Chen, "Proactive power optimization of sensor networks," in Proc. IEEE ICC’08, May. 2008.

  9. H. Liu, A. F. Molisch, S. Zhao, D. L. Goeckel, and P. Orlik, "Hybrid coherent and frequency-shifted-reference ultrawideband radio," in Proc. IEEE Globecom'07, Nov. 2007.

  10. F. Yildirim and H. Liu, "Directional MAC for 60 GHz using polarization diversity extension (DMAC-PDX)," in Proc. IEEE Globecom'07, Nov. 2007.

  11. R. Khanna, H. Liu, and H. H. Chen, ``Dynamic optimization of secure mobile sensor networks: a genetic algorithm,'' in Proc. IEEE ICC'07, June 2007

  12. R. Khanna and H. Liu, "Distributed and control theoretic approach to intrusion detection," in Proc. ACM IWCMC'07, Mar. 2007.

  13. O. C. Ozdural and H. Liu, "Phase noise suppression for OFDM systems over fast time-varying channels," in Proc. IEEE ICC’07, June 2007.

  14. O. C. Ozdural and H. Liu, " Mobile direction assisted predictive base station switching for broadband wireless systems," in Proc. IEEE ICC'07, June 2007.

  15. T. Nam, E.-K. Hong, and H. Liu, "New hybrid decision feedback equalization for DS-CDMA systems," in Proc. of IEEE WCNC'07, Mar. 2007.

  16.  X. Zhang,  J. Lee, and H. Liu, "Low complexity multiuser MIMO scheduling with channel decomposition," in Proc. of IEEE WCNC'07, Mar. 2007.

  17. R. Khanna and H. Liu, "System approach to intrusion detection using hidden Markov model," in Proc. International Wireless Communications and Mobile Computing Conference (IWCMC 2006), Vancouver, Canada, July 2006.

  18. Y. Choi, O. Ozdural, H. Liu, and S. Alamouti, "A maximum likelihood Doppler frequency estimator for OFDM systems," in Proc. IEEE ICC'06, Istanbul, Turkey, June 2006.

  19. L. Xian, R. Punnoose, and H. Liu, "Space-time block coded GMSK with low-complexity linear receiver," in Proc. IEEE ICC'06, Istanbul, Turkey, June 2006.

  20. R. Khanna, H. Liu, and H. H. Chen, "Self-organization of sensor networks using genetic algorithms," in Proc. IEEE ICC'06, Istanbul, Turkey, June 2006.

  21. H. H. Chen, J. Li, Y. Yang, X. Du, and H. Liu, "Challenges and futuristic perspective of CDMA technologies: OCC-CDMA/OS for 4G wireless networks," in Proc. IEEE ICC'06, Istanbul, Turkey, June 2006.

  22. H. Liu, "Multi-code ultra-wideband signaling using chirp waveforms," in Proc. of IEEE MILCOM'05, Oct. 2005.

  23. S. Zhao and H. Liu, ``Prerake diversity combining for pulsed UWB systems considering realistic channels with pulse overlapping and narrow-band interference,'' Proc. of IEEE Globecom 2005, Nov. 2005.

  24. J. Gao, O. Ozdural, S. Ardalan, and H. Liu, "Performance modeling of MIMO OFDM channels," in Proc. of 12th International Conference on Wireless Communications, Calgary, Canada, July 2005.

  25. Y. Zhang and H. Liu, ``Decision-feedback receiver for quasi-orthogonal space-time coded OFDM with correlative coding over fast fading channels,'' in Proc. of IEEE VTC 2005-Fall, Sep. 2005.
  26. L. Xian and H. Liu, ``An adaptive power allocation scheme for space-time block coded MIMO systems,'' in Proc. of IEEE WCNC'05, pp. 504-508, Mar. 2005.
  27. Z. Zhao, H. Liu, and Z. Tian, ``A decision-feedback authcorrelation receiver for pulsed ultra-wideband systems," in Proc. of IEEE 2004 Radio and Wireless Conference (Rawcon'04), Sep. 2004.
  28. S. Zhao, H. Liu, and S. Mo , ``Performance of a multi-band ultra-wideband system over indoor wireless channels," in Proc. of IEEE CCNC'04, Jan. 2004.
  29. H. Liu, ``A high-rate transmission scheme for ultra-wideband systems," Proc. of 2003 WNCG Wireless Networking Symposium, The University of Texas at Austin, Oct. 2003.
  30. V. Venkatesan, H. Liu, C. Nilsen, R. Kyker, and M. E. Magana, ``Performance of an optimally spaced PPM ultra-wideband system with direct sequence spreading for multiple access,'' Proc. of IEEE VTC03-Fall, Oct. 2003.
  31. H. Liu, ``Error performance of MIMO systems in frequency-selective Rayleigh fading channels,'' in Proc. of IEEE Globecom'03, Dec. 2003.
  32. A. Tjahjadi, M. Magana, and Huaping Liu, ``Turbo-coded OCC-CDMA with spatial diversity for wireless mobile communications,'' in Proc. of the 15th International Conference on Wireless Communications, July 2003.
  33. M. E. Magana and H. Liu, ``A multi-carrier CDMA system design based on orthogonal complementary codes,'' in Proc. IEEE Vehicular Technology Conference (Fall'03), 2003.
  34. H. Liu, V. Venkatasen, C. Nilsen, R. Kyker, M. Magana, ``Performance of frequency hopped noncoherent GFSK in correlated Rayleigh fading channels," in Proc. of 2003 IEEE International Conference of Communications, Anchorage, Alaska, May 11-15, 2003, pp. 2779-2783.
  35. H. Liu, ``An iterative algorithm for path loss modeling with field measurement data," Proc. of the 7th CDMA International Conference, Seoul, Krea, Nov. 2002, pp. 183-186.
  36. H. Liu, ``Packet queuing delay-throughput tradeoffs for WCDMA system reverse link with mixed traffic,'' in Proc. of the 7th CDMA International Conference, vol. 2, Nov. 2002, pp. 71-74.
  37. H. Liu, Z. Siveski, and N. Ansari, ``Fractionally spaced coherent detection with DF MAP estimation of statistically known time-varying Rayleigh fading channel," in Proc. of 1997 IEEE Global Communications Conference, Phoenix, AZ, Nov. 1997, pp. 419-423.
  38. H. Liu, Z. Siveski, and N. Ansari, ``Coherent decorrelating detector with imperfect channel estimates for CDMA Rayleigh fading channels," in Proc. of 1997 IEEE International Conference on Communications, Montreal, Canada, June 1997, pp. 600-604.
  39. H. Liu and Z. Siveski, ``A method of calculating transmitted power of mobiles in sectored cellular CDMA reverse link with imperfect power control,'' in Proc. of the 31st Annual Conference on Information Sciences and Systems, John Hopkins University, Baltimore, MD, Mar. 1997, pp. 299-302.
  40. H. Liu and Z. Siveski, ``Differentially coherent CDMA multiuser detector for Rayleigh fading channels,'' in Proc. of the 30th Annual Conference on Information Sciences and Systems, Princeton University, Princeton, NJ, Mar. 1996, pp. 86-89.