Journal Papers

• F. Yildirim, A. S. Sadri, and H. Liu, "Polarization effects for indoor wireless communications at 60 GHz," to appear in IEEE Communications Letters, 2008.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• R. Khanna and H. Liu, "Control theoretic approach to intrusion detection using distributed hidden Markov model," to appear in IEEE Wireless Communications, 2008.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• L. Xian and H. Liu, "Space-time block codes from cyclic design," IEEE Communications Letters, vol. 9, no. 3, pp. 231-233, Mar. 2005.
• H. Liu, "Multi-code ultra-wideband scheme using chirp waveforms," IEEE Journal on Selected Areas in Communications, vol. 24, pp. 885-891, April 2006.

Conference Proceedings

• J. He, Z. Wang, and H. Liu, "Low-complexity high-speed 4-D TCM decoder," to appear in Proc. 2008 IEEE Workshop on Signal Processing Systems, Washington D.C., Oct., 2008.
• R. Khanna, H. Liu, H. H. Chen, "Proactive power optimization of sensor networks," in Proc. IEEE ICC'08, May. 2008.
• H. Liu, A. F. Molisch, S. Zhao, D. L. Goeckel, and P. Orlik, "Hybrid coherent and frequency-shifted-reference ultrawideband radio," Proc. IEEE Globecom'07, Nov. 2007.
• F. Yildirim and H. Liu, "Directional MAC for 60 GHz using polarization diversity extension (DMAC-PDX)," in Proc. IEEE Globecom'07, Nov. 2007.
• 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
• R. Khanna and H. Liu, "Distributed and control theoretic approach to intrusion detection," in Proc. ACM IWCMC'07, Mar. 2007.
• O. C. Ozdural and H. Liu, "Phase noise suppression for OFDM systems over fast time-varying channels," in Proc. IEEE ICC'07, June 2007.
• O. C. Ozdural and H. Liu, "Mobile direction assisted predictive base station switching for broadband wireless systems," in Proc. IEEE ICC'07, June 2007.
• 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.
• X. Zhang, J. Lee, and H. Liu, "Low complexity multiuser MIMO scheduling with channel decomposition," in Proc. of IEEE WCNC'07, Mar. 2007.
• 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.
• 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.
• 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.
• 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.
• 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.
  

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