Selected publications

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Books & book chapters

  1. K. Choi and H. Liu, “Problem Based Learning in Communication Systems Using MATLAB and Simulink,” IEEE Press and John Wiley & Sons (available here)
  2. R. Khanna, H. Liu, and M. Awad, "Control theoretic approach to platform optimization using HMM," Hidden Markov Models, Theory and Applications, INTECH, 2011.
  3. R. Khanna, H. Liu, and H.H. Chen, "Energy efficient approach to dynamic clustering in sensor networks using genetic algorithm,'' Handbook on Sensor Networks, Editors, Y. Xiao, et al., World Scientific Publishing, Inc., 2009.
  4. 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.
Journal papers
  1. Y. Zou and H. Liu, “ RSS-based target localization with unknown model parameters and sensor position errors,” IEEE Transactions on Vehicular Technology (to appear), 2021.
  2. L. Wu, Z. Zhang, D. Jian, Y. Wu, H. Liu, and J. Wang, “ Successive-coded spatial shift keying modulation for MIMO wireless communications,” IEEE Transactions on Communications (to appear), 2021.
  3. J. Yan, G. Qi, B. Kang, X. Wu, and H. Liu, “ Extreme learning machine for accurate indoor localization using RSSI fingerprints in multi-floor environments,” IEEE Internet-of-Things Journal, Apr. 2021.
  4. Y. Lu,X. Huang, H. Liu, H. Yin, and L. Shen, “ Fast SHVC inter inter-coding based on Bayesian decision with coding depth estimation,” Journal of Real-Time Image Processing, Apr. 2021.
  5. J. Yan, G. Qi, B. Kang, X. Wu, and H. Liu, “ Extreme learning machine and AdaBoost based localization using CSI and RSSI,” IEEE Internet-of-Things Journal, Mar. 2021.
  6. C. Peng, G. Wang, F. Li, and H. Liu, “ Joint resource allocation for SWIPT-based two-way relay networks,” Energies, Nov. 2020.
  7. F. Li, S. Tan, Y. Xie, W. Ji, H. Liu, and Y. Yao, “ Quantum bacterial foraging optimization: from theory to 5G applications,” IEEE Open Journal of the Communications Society, Sep. 2020.
  8. M. Hansen, I. Lisenkov, H. Liu, A. Jander, and P. Dhagat, “ Correlation of binary-code-modulated microwave signals by parametric pumping of spin waves,” IEEE Magnetics Letters, Aug. 2020.
  9. L. Wu, Z. Zhang, D. Jian, Y. Wu, H. Liu, and J. Wang, “ Joint user identification and channel estimation for crowded massive MIMO communications,” IEEE Transactions on Vehicular Technology, vol. 69, no. 6, pp. 6803-6807, June 2020.
  10. S. Dasgupta, G. Wang, M. T. Simonich, T. Zhang, L. Truong, H. Liu, and R. L. Tanguay, “ Impacts of high dose 3.5 GHz cellphone radiofrequency on zebrafish embryonic development,” PLOS ONEJune 2020.
  11. Y. Zou and H. Liu, “ TDOA localization with unknown signal propagation speed and sensor position errors,” IEEE Communications Letters, vol. 24, no. 5, pp. 1024-1027, May 2020.
  12. Y. Zou and H. Liu, “ An efficient NLOS error mitigation algorithm for TOA-based localization,” Sensors, vol. 20, no. 5, Mar. 2020.
  13. L. Wu, Y. Shen, Z. Zhang, D. Jian, H. Liu, and J. Wang, “ Receiver algorithms for single-carrier OSM based high-rate indoor visible light communications,” IEEE Transactions on Wireless Communications, vol. 19, no. 2, pp. 1113-1126, Feb. 2020.
  14. Y. Zou and H. Liu, “ Semidefinite programming methods for alleviating clock synchronization bias and sensor position errors in TDOA localization,” IEEE Signal Processing Letters, vol. 27, pp. 241-245, Jan. 2020.
  15. Q. Lyu, Y. Qi, X. Zhang, H. Liu, Q. Wang, and N. Zheng, “SBAC: A secure blockchain-based access control framework for information-centric networking," Journal of Network and Computer Applications,” Journal of Network and Computer Applications, vol. 149, Jan. 2020.
  16. L. Wu, Z. Zhang, J. Dang, J. Hao, and H. Liu, “ UFMC based interference management for heterogeneous small-cell networks,” IEEE Access, vol. 7, pp. 136559-136567, Sep. 2019.
  17. M. Alarfaj and H. Liu, “ Subarray hybrid precoding with finite-resolution PSs for massive MIMO capacity maximization,” IET-Communications, vol.13, no. 16, pp. 2500-2505, Oct. 2019.
  18. X. Ma, J. Kim, D. Yuan, and H. Liu, “ Two-level sparse structure based compressive sensing detector for uplink spatial modulation with massive connectivity,” IEEE Communications Letters, vol. 23, no. 9, pp. 1594-1597, Sep. 2019.
  19. R. Guo, K. Chen, and H. Liu, “ Multi-CRC polar codes and M-SCFlip-based decoding,” IEEE Access, Aug. 2019.
  20. Q. Lyu, N. Zheng, H. Liu, C. Gao, S. Chen, and J. Liu, “ Remotely access "my" smart home in private: An anti-tracking authentication and key agreement scheme,” IEEE Access, Mar. 2019.
  21. L. Wu, J. Cheng, Z. Zhang, J. Dang, and H. Liu , “ Low-complexity spatial modulation for IM/DD optical wireless communications,” IEEE Photonics Technology Letters, vol. 31, no. 6, pp. 475-478, Mar. 2019.
  22. C. Peng, F. Li 1, H. Liu, and G. Wang, “ Outage-based resource allocation for DF two-way relay networks with energy harvesting,” Sensors, Nov. 2018.
  23. Y. Lu, H. Liu, Y. Lin, L. Shen, and H. Yin, “ Efficient coding mode and partition decision for screen content intra coding,” Signal Processing: Image Communication, vol. 68, pp. 249-257, 2018.
  24. Y. Lu, H. Liu, Y. Lin, Y. Yao, and H. Yin, “ Fast intra coding based on online learning for high efficiency video coding,” Optik, pp. 136-143, Aug. 2018.
  25. Z. Su, G. Shao, and H. Liu, “ Semidefinite programming for NLOS error mitigation in TDOA localization,” IEEE Communications Letters, vol. 22, no. 7, pp. 1430-1433, 2017.
  26. S. Kwon, D. Kim, J. Lee, S. Moon, M. Chu, S. Bae, C. You, H. Liu, J.H. Kim, D. J. Kim, H. Park, J. Y. Kim, C.-S. Kim, and I. Hwang, “ 3D localization for launch vehicle using virtual TOA and AOA of ground stations,” Wireless Personal Communications, 2018.
  27. Y. Zou, H. Liu, and Q. Wan, “An iterative method for moving target localization using TDOA and FDOA measurements,” IEEE Access, vol. 6, pp. 2746-2754, Dec. 2017.
  28. L. Wu, Z. Zhang, J. Dang, J. Wang, and H. Liu, “Channel estimation for multicell multiuser massive MIMO uplink over Rician fading channels," IEEE Transactions on Vehicular Technology, vol. 66, no. 10, pp. 8872-8882, Oct. 2017.
  29. Y. Zou, H. Liu, and Q. Wan, “Joint synchronization and localization in wireless sensor networks using semidefinite programming,” IEEE Internet of Things Journal), vol. 5, no. 1, pp. 199-205, Feb. 2018.
  30. J. M. Williams, R. Khanna, J. P. Ruiz-Rosero, G. Pisharody, Y. Qian, C. R. Carlson, H. Liu, and G. Ramirez-Gonzalez, “Weaving the wireless Web,” IEEE Microwave Magazine, vol. 18, no. 7, pp. 40-63, Nov./Dec. 2017.
  31. J. Ruiz-Rosero, G. Ramirez-Gonzalez, J. Williams, H. Liu, R. Khanna, G. Pisharody, “Internet of things: a scientometric review,” Symmetry, vol. 9, no. 12, Dec. 2017.
  32. Y. Zou, H. Liu, W. Xie, and Q. Wan, “Semidefinite programming methods for alleviating sensor position error in TDOA localization,” IEEE Access, Sep. 2017.
  33. C. Peng, F. Li, and H. Liu , “ Wireless energy harvesting two-way relay networks with hardware impairments,” Sensors, Nov. 2017.
  34. L. Wu, J. Cheng, Z. Zhang, J. Dang, and H. Liu, “Channel estimation for optical-OFDM based multiuser MISO visible light communication,” IEEE Photonics Technology Letters, vol. no. 20, pp. 1727-1730, Oct. 2017.
  35. C. Wei, H. Liu, Z. Zhang, J. Dang, and L. Wu, “Near-optimum sparse channel estimation based on least squares and approximate message passing,” IEEE Wireless Communications Letters, Aug. 2017.
  36. Y. Zhou, H. Zhang, D. Yuan, P. Zhang, and H. Liu, “Differential spatial modulation with BPSK for two-way relay wireless communications,” IEEE Communications Letters, vol. 21, no. 6, pp. 1361-1364, June 2017.
  37. C. Peng, F. Li, and H. Liu, “Optimal power splitting in two-way decode-and-forward relay networks,” IEEE Communications Letters, vol. 21, no. 9, pp. 2009-2012, Sep. 2017.
  38. S. Malik, S. Moon, B. Kim, C. You, H. Liu, J.-H. Kim, J. Kim, and I. Hwang, “Novel detection scheme for LSAS using power allocation in multi-user scenario with LTE-A and MMB channels,” Wireless Personal Communications, vol. 95, no. 4, pp. 4425-4440, Aug. 2017.
  39. L. Wu, Z. Zhang, J. Dang, and H. Liu, “Blind interference alignment for multiuser MISO indoor visible light communications,” IEEE Communications Letters, vol. 21, no. 5, pp. 1039-1042, May 2017.
  40. C. Wei, Z. Zhang, L. Wu, and H. Liu, “Approximate message passing based joint user activity and data detection for NOMA,” IEEE Communications Letters, vol. 21, no. 3, pp. 640-643, Mar. 2017.
  41. S. Moon, H. Choe, M. Chu, C. You, H. Liu, J.-H. Kim, J. Kim, D. J. Kim, and I. Hwang, “Advanced receiver for interference suppression and cancellation in sidelink system of LTE-advanced,” Wireless Personal Communications, vol. 95, no. 4, pp 4321-4335, Aug. 2017.
  42. N. Keskin and H. Liu, “Practical considerations for electromagnetic interference suppression rate with spread spectrum clocking,” IEEE Electromagnetic Compatibility Magazine, vol. 5, no. 2, pp. 57-60, Aug. 2016.
  43. L. Wu, Z. Zhang, J. Dang, J. Wang, and H. Liu, “Polarity information coded flip-OFDM for intensity modulated systems,” IEEE Communications Letters, vol. 20, no. 8, Aug. 2016, pp. 1535-1538
  44. S. Malik, S. Moon, B. Kim, C. You, H. Liu, J.-H. Kim, J. Kim, and I. Hwang, “Design and analysis of novel precoding scheme for LSAS using power allocation,” Wireless Personal Communications , Jul. 2016. (online)
  45. S. Moon, H. Choe, M. Chu, C. You, H. Liu, J.-H. Kim, J. Kim, D. J. Kim, and I. Hwang, “Novel hybrid receiver for interference cancellation and suppression in sidehaul systems,” Wireless Personal Communications, vol. 87, no. 4, pp 1241-1263, Apr. 2016.
  46. Y. Whang, S. Park, and H. Liu, “Low-complexity symbol-level combining for HARQ in MIMO systems with linear detection,” IET-Communications, 2016.
  47. Y. Whang, S. Park, and H. Liu, "Effective interference level based packet transmission for MIMO systems with hybrid ARQ," IET Communications, Mar. 2016.
  48. N. Keskin and H. Liu, “Tuning of a wireless power transfer system with hybrid capacitor array,” Wireless Power Transfer of Cambridge Journals, vol. 3, no. 1, Mar. 2016, pp. 9-14.
  49. N. Keskin and H. Liu, “Double-pulse charge technique for wireless and mobile devices,” Analog Integrated Circuits and Signal Processing (Kluwer Academics), vol. 86, no. 2, pp 299-305, Feb. 2016.
  50. K. Chae, S. R. Lee, H. Liu, S. Yoo, S. Y. Kim, G.-I. Jee, D.-J. Yeom, and S. Yoon, “A novel unambiguous composite binary offset carrier(6,1,1/11) tracking based on partial correlations,” Computers and Electrical Engineering, vol. 50, pp. 54-66, Feb. 2016.
  51. K. Chae, S. R. Lee, H. Liu, and S. Yoon, “An unambiguous correlation function for generic sine-phased binary offset carrier signal tracking,” Computers and Electrical Engineering, vol. 49, pp. 161-172, Jan. 2016.
  52. S. Moon, B. Kim, S. Malik, C. You, H. Liu, J.-H. Kim, J. Kim, M.-S. Lee, and I. Hwang, “Novel hybrid receiver for interference cancellation and suppression in sidehaul system,” Wireless Personal Communications, vol. 84, pp. 377-393, Sep. 2015. (published online on May 6, 2015)
  53. C. Lu, L. Wu, P. Chen, J. Wang, and H. Liu, “M-ary phase position shift keying with orthogonal signalling,” IET Communications, vol. 9, no. 13, pp. 1627-1634, Aug. 2015.
  54. K. Chae, S. R. Lee, H. Liu, and S. yoon, “A novel multiple objective fitness function for DSA transmission parameter optimization,” Scientia Iranica Transactions B: Mechanical Engineering, vol. 22, no. 4, pp. 1567-1575, Aug. 2015.
  55. I. Sohn, H. Liu, and N. Ansari, “Optimizing cellular networks enabled with renewal energy via strategic learning,” PLOS ONE, July 2015.
  56. S. Moon, B. Kim, S. Malik, C. You, H. Liu, J.-H. Kim, J. Kim, and I. Hwang, “Cell selection and resource allocation for interference management in a macro-picocell heterogeneous network,” Wireless Personal Communications. (published online on March 6, 2015)
  57. S. Moon, B. Kim, S. Malik, C. You, H. Liu, J.-H. Kim, and I. Hwang, "Interference management with cell selection using cell range expansion and ABS in the heterogeneous network based on LTE-advanced," Wireless Personal Communications-Special Issue on Ubiquitous and Future Networks, vol. 81, no. 1, pp-151–160, Mar. 2015.
  58. L. Wu, Z. Zhang, J. Dang, and H. Liu, "Adaptive modulation schemes for visible light communications," IEEE Journal of Lightwave Technology, vol. 33, no. 1, pp. 177-125, Jan. 2015.
  59. Y.-P. Lee, S. R. Lee, S. Yoo, H. Liu, and S. Yoon, "An unambiguous tracking scheme using partial-pulses for BOC signals," Journal of Applied Research and Technology, vol. 12, no. 6, pp. 1103-1114, Dec. 2014.
  60. Y.-P. Lee, S. R. Lee, S. Yoo, H. Liu, and S. Yoon, "Cyclostationarity-based detection of randomly arriving or departing signals," Journal of Applied Research and Technology, vol. 12, no. 6, pp. 1083-1091, Dec. 2014.
  61. Y.-P. Lee, S. R. Lee, S. Yoo, H. Liu, and S. Yoon, "A low-complexity integer frequency offset estimation scheme using combined training symbols for OFDM systems," Journal of Applied Research and Technology, vol. 12, no. 6, pp. 1073-1082, Dec. 2014.
  62. T. Qiao, Y. Zhang, and H. Liu, "Nonlinear expectation maximization estimator for TDOA localization," IEEE Wireless Communications Letters, vol. 3, no. 6, pp. 637-640, Dec. 2014.
  63. R. Khanna, H. Liu, and T. Rangarajan, "Wireless data center management," IEEE Microwave Magazine, vol. 15, no. 7 (supplement), pp. S45 - S60, Nov./Dec. 2014.
  64. L. Wu, Z. Zhang, and H. Liu, "Transmit beamforming for MIMO optical wireless communication systems,"Wireless Personal Communications, 2014, vol.  78, no. 1, pp 615-628, Sep. 2014.
  65. Saransh Malik, Bora Kim, Sangmi Moon, Cheolwoo You, Huaping Liu, Jeong-Ho Kim, Intae Hwang, "Hybrid multihop relay protocol using dynamic power allocation for LTE-advanced system," Wireless Personal Communications, vol. 77, no. 4, pp. 2945-2958, Aug. 2014.
  66. T. Qiao and H. Liu, "Improved least median of squares localization for non-line-of-sight mitigation," IEEE Communications Letters, vol. 18, no. 8, pp. 141-144, Aug. 2014.
  67. Bora Kim, Saransh Malik, Sangmi Moon, Cheolwoo You, Huaping Liu, Jeong-Ho Kim, Intae Hwang, "Performance analysis of coordinated multi-point with scheduling and precoding schemes in the LTE-A system," Wireless Personal Communications, vol. 77, no.4, pp. 2615-2630, Aug. 2014.
  68. A. Abbasi and H. Liu, "Improved LOS/NLOS classification methods for pulsed ultrawideband localization," IET Communications, vol. 8, no. 5, pp. 680–688, Mar. 2014.
  69. S. Malik, S. Moon, B. Kim, C. You, H. Liu, and I. Hwang, "Design and analysis of an interference cancellation algorithm for AF, DF and DMF relay protocol in multiuser MIMO scenario based on the LTE-advanced system," Wireless Personal Communications, vol. 75, no. 1, pp. 775–797, Mar. 2014.
  70. S. Malik, S. Moon, B. Kim, C. You, H. Liu, and I. Hwang, "New relay protocols with AMC scheme for throughput enhancement in LTE-advanced system," Wireless Personal Communications, vol. 74, no. 2, pp 773-788, Jan. 2014.
  71. T. Qiao, S. Redfield, A. Abbasi, Z. Su, and H. Liu, "Robust coarse position estimation for TDOA localization," IEEE Wireless Communications Letters, vol. 2, no. 6, pp. 623-626, Dec. 2013.
  72. S. Malik, S. Moon, B. Kim, H. Liu, C. You, J.-H. Kim and I. Hwang, "Novel relay protocol using AMC based throughput optimization in LTE-advanced system,” IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, vol. E96-A, No. 12, pp. 2735-2739, Dec. 2013.
  73. M. Adeli and H. Liu, "On the inherent security of linear network coding," IEEE Communications Letters, vol. 17, no. 8, pp. 168-1671, Aug. 2013.
  74. T. Qiao and H. Liu, "An improved method of moments estimator for TOA based localization,"IEEE Communications Letters, vol. 17, no. 7, pp. 1321-1324, Jul. 2013.
  75. R. J. Whang, S. Malik, I. Hwang, and H. Liu, "Cooperative multiuser relay communications employing hierarchical modulation," Wireless Personal Communications, vol. 69, no. 4, pp 1463-1479, Apr. 2013.
  76. L. Wu, Z. Zhang, and H. Liu, "Adaptive modulation with finite rate feedback for QRD-SIC based MIMO systems," IET-Communications, vol. 7, no. 5, pp. 456–462, Mar. 2013.
  77. C. Seo, S. Portugal, S. Malik, C. You, T. Jung, H. Liu, I. Hwang, “Throughput performance analysis of AMC based on a new SNR estimation algorithm using preamble,” Wireless Personal Communications, vol. 68, no. 4, pp. 1225-1240, Feb. 2013.
  78. L. Wu, Z. Zhou, and H. Liu, “Modulation scheme based on precoder matrix for MIMO optical wireless communication systems,”  IEEE Communications Letters, vol. 16, no. 9, pp. 1516-1519, Sep. 2012.
  79. H. Zhang, H. Liu, and S. Quan, “Hue constrained matrix optimization for preferred color reproduction,” Journal of Electronic Imaging, vol. 21, no. 3, Sep. 2012.
  80. W. Liu, K. Choi, and H. Liu, “Computationally efficient lattice reduction aided detection for MIMO-OFDM systems under frequency-selective Ricean fading channels,”ETRI Journal, vol. 34, no. 4, Aug. 2012.
  81. M. Magana, H. Liu, and V. Venkatesan, "Performance of a binary PPM ultra-wideband communication system with direct sequence spreading for multiple access," Wireless Personal Communications, vol. 65, no. 1, pp 125-142, July 2012.
  82. L. Xia, C. Hu, S. Redfield, S. Woracheewan, R. Khanna, J. Nejedlo, H. Liu, and P. Chiang, “Wireless interconnects for future computing systems,” Intel Technology Journal, vol. 16, no. 2, June 2012.
  83. R. Whang, S. Portugal, I. Hwang, and H. Liu, “Cooperative multiuser relay communication with superposition coding,” IEICE Trans. on Communications, 2012, vol. E95-B, no. 6, pp. 2133-2136, June 2012.
  84. K. Choi and H. Liu, “Polyphase scrambled Walsh codes for zero-correlation zone extension in QS-CDMA,” IEEE Communications Letters, vol. 16, no. 4, pp. 429-431, Apr. 2012.
  85. J. He, H. Liu, Z. Wang, X. Huang, and K. Zhang, "High-speed low-power Viterbi decoder design for TCM decoders," IEEE Trans. on Very Large Scale Integration Systems, , vol. 20, no. 4, pp. 755-759, Apr. 2012.
  86. C. Hu, R. Khanna, J. Nejedlo, K. Hu, H. Liu, and P. Y. Chiang, " A 90nm-CMOS, 500Mbps, 3-5GHz fully-integrated IR-UWB transceiver with multi-path equalization using pulse injection-locking for receiver phase synchronization," IEEE J. Solid-State Circuits, vol. 46, no. 5, pp. 1076-1088, May 2011.
  87. C. Seo, I. Cho, S. Portugal, J. Park, T. Jung, I. Hwang, H. Liu, and C. You, "Performance analysis of a new preamble-based SNR estimation algorithm,"IEICE Trans. Communications, vol. E94-B, no. 5, pp. 1498-1501, May 2011.
  88. S. Redfield, S. Woracheewan, H. Liu, P. Chiang, J. Nejedlo, and R. Khanna, "Understanding the ultrawideband channel characteristics within a computer chassis," IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 191-194, May 2011.
  89. C. You, G. Yoon, C. Seo, S. Portugal, G. Park, T. Jung, H. Liu, and I. Hwang, “Intercell interference coordination using threshold-based region decisions,” Wireless Personal Communications, vol. 59, no. 4, pp. 789–806, Mar. 2011.
  90. K. Choi and H. Liu, "Power allocation for distributed transmit diversity with feedback loop delay," IEEE Transactionson Communications, vol. 59, no. 1, pp. 52-58, Jan. 2011.
  91. K. Choi and H. Liu, "Quasi-synchronous CDMA using properly scrambled Walsh codes as user-spreading sequences," IEEE Transactions on Vehicular Technology, vol. 59, no. 7, pp. 3609-3617, Sep. 2010.
  92. T. Xu and H. Liu, "On angle feedback and antenna shuffling in double space-time transmit diversity systems,"IEEE Communications Letters, vol. 14, no. 8, pp. 701-703, Aug. 2010.
  93. K. Kim, J. Lee, H. Liu, "Spatial correlation based antenna grouping for MIMO systems,"IEEE Trans. on Vehicular Technology, vol. 59, no. 6, pp. 2898-2905, July 2010.
  94. P. Chiang, S. Woracheewan, C. Hu, L. Guo, R. Khanna, J. Nejedlo, and H. Liu, "Short-range, wireless interconnect for next-generation computing platforms,"IEEE Design & Test for Computer, vol. 27, no. 4, pp. 32-43, July/Aug. 2010.
  95. J. He, Z. Wang, and H. Liu, "An efficient 4-D 8PSK TCM decoder architecture," IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol. 18, no. 5, pp. 808-817, May 2010.
  96. M. Adeli and H. Liu, "Secure network coding with minimum overhead based on hash functions," IEEE Communications Letters, vol. 13, no. 12, pp. 956-958, Dec. 2009.
  97. H. Liu, A. F. Molisch, D. Goeckel, and P. Orlik, "Hybrid coherent and frequency-shifted-reference ultrawideband radio,"Physical Communication Journal, Special Issue on Advances in Ultra-Wideband Wireless Communications (invited paper), vol. 2, no. 4, pp. 265-273, Dec. 2009.
  98. 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.
  99. 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.
  100. 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
  101. 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.
  102. 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.
  103. 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.
  104. 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.
  105. 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.
  106. 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.
  107. 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.
  108. 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, Nov. 2007.
  109. 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.
  110. 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.
  111. 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.
  112. 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.
  113. 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.
  114. 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.
  115. 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.
  116. H. Liu, "Multi-code ultra-wideband scheme using chirp waveforms," IEEE Journal on Selected Areas in Communications, vol. 24, pp. 885-891, April 2006.
  117. 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.
  118. 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.
  119. 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.
  120. 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.
  121. 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.
  122. 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.
  123. 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.
  124. 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.
  125. L. Xian and H. Liu, ``Exact error probability for space-time block coded MIMO systems over Rayleigh fading channels,'' IEE Proceedings-Communication, vol. 152, pp. 197-201, Apr. 2005.
  126. 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.
  127. 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.
  128. L. Xian and H. Liu, ``Space-time block codes from cyclic design,'' IEEE Communications Letters, vol. 9, no. 3, pp. 231-233, Mar. 2005.
  129. 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.
  130. 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.
  131. 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.
  132. 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.
  133. 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.
  134. H. Liu and Z. Siveski, ``Fractionally sampled decorrelator for CDMA Rayleigh fading channels," IEE Electronics Letters, vol. 33, pp. 741-742, Apr. 1997.
  135. H. Liu and J. Kong, ``Analysis of frequency pulling using Volterra series method,'' Journal of Electronics, vol. 14, pp. 306-310, Mar. 1992.
  136. 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.
  137. H. Liu and J. Kong, ``Analysis of nonlinear sinusoidal oscillator using Volterra series,'' Telecommunication Engineering, vol. 31, pp. 7-10, Oct. 1991.
  138. Y. Zhou and H. Liu, ``Design of an IF wide-band endless phase shifter,'' Journal of Nanjing Institute of Posts and Telecommunications, vol. 8, pp. 73-80, Aug. 1988.

Conference papers

  1. A. Abbasi and H. Liu, "OneAI - Novel multipurpose deep learning algorithms for UWB wireless networks," in Proc. SiPS 2021.
  2. S. A. Aly, A. Abbasi, and H. Liu, "A novel hybrid AoA and TDoA solution for transmitter positioning," in Proc. IEEE IPIN'21, Nov. 2021.
  3. Y. Zou and H. Liu, "Semidefinite programming methods for alleviating clock synchronization bias and sensor position errors in TDOA localization," in Proc. IEEE ICASSP, June 2021.
  4. G. Wang, A. Abbasi, and H. Liu, "WiFi-based environment adaptive positioning with transferable fingerprint features," in Proc. IEEE Computer and Communication Workshop and Conference, Jan. 2021.
  5. G. Wang, A. Abbasi, and H. Liu, "Dynamic phase calibration method for CSI-based indoor positioning," in Proc. IEEE Computer and Communication Workshop and Conference, Jan. 2021.
  6. A. Abbasi and H. Liu, "Novel CNN and hybrid CNN-LSTM algorithms for UWB SNR estimation," in Proc. IEEE Computer and Communication Workshop and Conference, Jan. 2021.
  7. A. Abbasi and H. Liu, "Novel cascade CNN algorithm for UWB signal denoising, compressing, and ToA estimation," in Proc. IEEE Computer and Communication Workshop and Conference, Jan. 2021.
  8. S. Kaviani, I. Sohn, and H. Liu, "Application of complex systems in neural networks against Backdoor attacks," in Proc. 11th Int. Conf. ICT Convergence, Jeju Island, Korea, Oct. 2020.
  9. H. Liu, H. Kim, S. Moon, and I. Hwang, "Deep learning for channel estimation and tracking in vehicular to infrastructure communications," in Proc. 11th Int. Conf. ICT Convergence, Jeju Island, Korea, Oct. 2020.
  10. H. Liu, S. Moon, H. Kim, and I. Hwang, "DNN-based beam and blockage prediction in 3GPP InH scenario," in Proc. 11th Int. Conf. ICT Convergence, Jeju Island, Korea, Oct. 2020.
  11. A. Aljerme and H. Liu, "Time-varying Kalman modeling of measured RSSI in multipath wireless channels," in Proc. Int. Conf. on Computing, and Communications, San Francisco, June 2020.
  12. F. Alhussein and H. Liu "Variable vs. fixed window width CCRW receivers for multipath mitigation in GNSS with BOC and MBOC signals," in Proc. Int. Conf. on Computing, and Communications, San Francisco, June 2020.
  13. Y. Zou and H. Liu, "A simple and efficient iterative method for TOA localization," in Proc. IEEE ICASSP'20, Barcelona, Spain, May 2020.
  14. A. Aljerme and H. Liu, "A time-varying neural-network-based ARX model of the traffic in mobile networks," in Proc. of the 10th IEEE Annual Computing and Communication Workshop and Conference (CCWC), Las Vegas, Jan. 2020.
  15. F. Alhussein and H. Liu, "A CCRW receiver with a single window of variable width for mitigation of multipath and ambiguity in GNSS with MBOC signals," in Proc. of the 10th IEEE Annual Computing and Communication Workshop and Conference (CCWC), Las Vegas, Jan. 2020.
  16. J. M. Williams, F. Gao, Y. Qian, C. Song, R. Khanna, and H. Liu, "Proof-of-concept for an IoT sensor platform with 2.4GHz wake-up radio," in Proc. IEEE RWW, ouston, TX, Jan. 2020.
  17. J. M. Williams, R. Khanna, Y. Qian, and H. Liu, "Proof-of-concept for an IoT sensor platform with 2.4GHz wake-up radio," in Proc. IEEE RWW, ouston, TX, Jan. 2020.
  18. J.M. Williams, R. Khanna, L. Rumbel, Y. Qian, and H. Liu, "Target localization using approximate maximum likelihood for MIMO radar system," in Proc. 2019 IEEE Global Humanitarian Technology Conference (GHTC), Seattle, WA, Oct. 2019.
  19. A. Fawaz M, Almalki, Y. Zou, and H. Liu, "Solar and RF energy harvesting design model for sustainable wireless sensor tags," in Proc. IEEE Vehicular Technology (VTC19-Fall), Honolulu, Haiwaii, Sep. 2019.
  20. F. Alhussein and H. Liu, "An efficient method for multipath mitigation applicable to BOC signals in GNSS," in Proc. Int. Conf. Wireless Commun. Mobile Comput., Tangier, Morocco, Jun. 2019.
  21. A. Aljerme and H. Liu, "Efficient Kalman modeling of multipath wireless channel for secret key generation," in Proc. Int. Conf. Wireless Commun. Mobile Comput., Tangier, Morocco, Jun. 2019.
  22. K. Zhan,Y. Liu,T. Kamgaing, R. Khanna, G. Dogiamis, H. Liu, and A. Natarajan, " A low-power FSK/spatial modulation receiver for short-range mm-wave wireless links," in Proc. IEEE 2019 Int. Microwave Symp. (IMS 2019), June 2-7, 2019, Boston, Massachusetts.
  23. T. Cheng, Y. Song, T. Li, F. Li, and H. Liu, " Wide-range dimmable clipped flip-OFDM for indoor visible light communications," in Proc. IEEE APCC 2018, Nov. 2018, Ningbo, China (invited).
  24. L. Wu, L. Kong, Z. Zhang, J. Dang, and H. Liu, " Wide-range dimmable clipped flip-OFDM for indoor visible light communications," in Proc. IEEE/CIC Int. Conf. Commun. in China (ICCC), Aug. 2018, Beijing, China.
  25. Y. Zou, H. Liu, Q. Wan, " Semidefinite programming for TDOA localization with locally synchronized anchor nodes," in Proc. IEEE ICASSP'18, Apr. 2018, Calgary, Canada.
  26. J.M. Williams, J.P. Ruiz-Rosero, R. Khanna, G. Pisharody, Y. Qian, J. Wang, C. Carlson, H. Liu, G. Ramirez-Gonzalez, " Enabling densely-scalable low-power WSNs for shipping and industrial IoT," in Proc. IEEE UEMCON 2017, Oct. 2017, New York City, New York.
  27. C. Peng, F. Li, and H. Liu, "Hierarchically modulated network-coding-assisted cooperation in multiuser relay networks," in Proc. IEEE IEEE VTC17-Fall, Sep. 2017, Toronto, Canada.
  28. M. Alarfaj and H. Liu, "Subarray hybrid precoding for massive MIMO capacity maximization," in Proc. IEEE ICUWB 2017, Sep. 2017, Salamanca, Spain.
  29. M. Alarfaj and H. Liu, "Generalizing hybrid beamforming solutions for massive MIMO systems," in Proc. IEEE VTC17-Fall, Sep. 2017, Toronto, Canada.
  30. L. Wu, Z. Zhang, D. Dang, and H. Liu, "Enhanced time-shifted pilot based channel estimation in massive MIMO systems with finite number of antennas," in Proc. IEEE ICC'17, May 2017, Paris, France.
  31. C. Wei, Z. Zhang, and H. Liu, "Expectation-propagation based low-complexity channel estimation for massive MIMO systems," in Proc. IEEE ICC'17, May 2017, Paris, France.
  32. T. Qiao and H. Liu, "Incremental anchor layout for indoor positioning," in Proc. IEEE ICC'17, May 2017, Paris, France.
  33. K. Zhan, G. Wang, T. Kamgaing, R. Khanna, H. Braunisch, G. Dogiamis, H. Liu, and A. Natarajan, "A low-power 68GHz FSK/Spatial modulation transmitter for mm-Wave wireless links," in IEEE 2017 Int. Microwave Symp.,, June 4-9, Honolulu, Hawaii.
  34. G. Wang, K. Zhan, T. Kamgaing, R. Khanna, H. Liu, and R. Natarajan, "Measurement-based channel modeling for mmWave wireless links in enclosed server platforms," in Proc. IEEE Radio and Wireless Week,, Phoenix, Arizona, Jan. 2017.
  35. Z. Su, G. Shao, and H. Liu, "Synchronization-free model with signal repeater for timing-based localization," in Proc. IEEE VTC 2016-Fall,, Sep. Montreal, Canada.
  36. Z. Su, G. Shao, and H. Liu, "A soft-minimum method for NLOS error mitigation in TOA systems," in Proc. IEEE VTC 2016-Fall,, Sep. Montreal, Canada.
  37. C. Peng, F. Li, and H. Liu, "Multi-layer network coding for multiuser relay networks with non-uniform-rate users," in Proc. IEEE VTC 2016-Fall,, Sep. Montreal, Canada.
  38. L. Li, C. Zheng, and H. Liu, "Handover performance in 5G HetNets with millimeter wave cells," in Proc. 16th Int. Symp. Commun. and Information Technologies (ISCIT 2016),, Qingdao, China, Sep. 2016.
  39. L. Wu, Z. Zhang, J. Dang, and H. Liu, "Capacity lower bounds of IM/DD AWGN optical wireless channels based on Fano's inequality," in Proc. IEEE WCSP 2015, Hangzhou, China, Oct. 2015.
  40. Y. Whang, H. Liu, and S. Park, "HARQ transmission state control for throughput improvement in MIMO systems with interference cancellation," in Proc. IEEE VTC'15-Spring, Glasgow, Scotland, May 2015.
  41. L. Wu, Z. Zhang, J. Dang, and H. Liu, "Coefficients separation MIMO-OFDM optical wireless communication system in diffuse fading channels," in Proc. IEEE ICC'2015, U.K. June, 2015.
  42. N. Keskin and H. Liu, "Unit antenna based wireless power transfer systems," in Proc. 2015 65th IEEE Electronic Components and Technology Conference (ECTC), San Diego, CA, May 2015, pp. 1828-1833.
  43. N. Keskin and H. Liu, "Complementary Class-E amplifier for wireless power transfer," in Proc. 2015 65th IEEE Electronic Components and Technology Conference (ECTC), San Diego, CA, May 2015, pp. 2235-2240.
  44. K. Chae, H. Liu, and S. Yoon, "A transmission parameter optimization method for GA-based cognitive engines," in Proc. Int. Conf. on Wireless Networks, Bali, Indonesia, Sep. 2014.
  45. K. Chae, H. Liu, and S. Yoon, "Unambiguous BOC signal tracking based on partial correlations," in Proc. IEEE VTC'14-fall, Vancouver, Canada, Sep. 2014.
  46. N. Keskin and H. Liu, "Fast charging method for wireless and mobile devices using double-pulse charge technique," in Proc. IEEE Wireless Power Transfer Conference, Jeju, Korea, May 2014.
  47. N. Keskin and H. Liu, "Practical considerations on spread spectrum clocking," in Proc. IEEE Wireless Telecommunications Symposium, Washington D.C., April 2014.
  48. N. Keskin and H. Liu, "A low power receiver architecture for near field communication systems," in Proc. IEEE Wireless Telecommunications Symposium, Washington D.C., April 2014.
  49. Z. Su, J. Huschle, S. Redfield, T. Qiao, F. Liu, and H. Liu, "High-speed real-time multi-channel data-acquisition unit: challenges and results," in Proc. IEEE CCNC'14, Las Vegas, Jan. 2014.
  50. L. Wu, Z. Zhang, and H. Liu, “MIMO-OFDM visible light communications system with low complexity,” in Proc. IEEE ICC'13, Budapest, Hungary, June 2013.
  51. M. Adeli and H. Liu, "A high-throughput and low-complexity secure linear network coding protocol," in Proc. The 2013 Int. Conf. Security and Management (SAM'13), Las Vegas, July 2013.
  52. R. Khanna and H. Liu, “Machine learning approach to data center monitoring using wireless sensor networks,” in Proc. IEEE Globecom’12, Anaheim, CA, Dec. 2012.
  53. R. Khanna, D. Choudhury, P. Chiang, and H. Liu, “Innovative approach to machine monitoring in IT servers using wireless interconnects,” in Proc. IEEE RWW’12, Jan. 2012, Santa Clara, CA
  54. H. Zhang, H. Liu, and S. Quan, “Multi-illuminant color constancy for HDR images through exposure segmentation,” in Proc. IS&T/SPIE Electronic Imaging, Jan. 2012, Burlingame, CA
  55. L. Xia, C. Hu, S. Redfield1, S. Woracheewan1, R. Khanna, J. Nejedlo, H. Liu, and P. Y. Chiang, “Design challenges for ultra-wideband wireless communications within a computer chassis,” in Proc. RFIT 2011, Dec. 2011, Beijing, China.
  56. R. Ye and H. Liu, "Ultra-wideband localization with collocated receivers,” in Proc. IEEE ICUWB’11, Bologna, Italy, Sep. 2011.
  57. J. Wang, R. Ye, H. Liu, and R. Zhang, “'UWB signaling for CR and coherent receivers and localization with weak received signals,” in Proc. IEEE ICUWB’11, Bologna, Italy, Sep. 2011.
  58. H. Zhang, H. Liu, and S. Quan, "Color correction optimization with hue regularization," in Proc. SPIE Conf. Color Imaging XVI, San Francisco, CA, Jan. 2011.
  59. C. Weber, J. He, C. Zhong, and H. Liu, "Multiband Architecture for high-speed SerDes," in Proc. DesignCon 2011, Santa Clara, CA, Jan. 2011.
  60. S. L. Marple, Jr., M. Adeli, and H. Liu, "Superfast algorithm for minimum variance (Capon) spectral estimation," in Proc. 2009 Asilomar Conf. on Signals, Systems, and Computers, CA, Nov. 2010.
  61. W. Liu, K. Choi, and H. Liu, "Computationally efficient lattice reduction for MIMO-OFDM systems," in Proc. 2001 IEEE WiMob'10, Niagara Falls, Canada, Oct. 2010.
  62. H. Jiang, Z, Wang, and H. Liu, "Iterative symbol-by-symbol decoding of LDPC codes and constellation mapping for multilevel modulation," in Proc. ChinaCom'10, Beijing, China, Aug. 2010.
  63. R. Ye, S. Redfield, and H. Liu, "High-precision indoor UWB localization: Technical challenges and method," in Proc. IEEE ICUWB'10, Sep. 2010.
  64. R. Ye and H. Liu, "UWB TDOA localization system: Receiver configuration analysis," in Proc. IEEE ISSSE'10, Sep. 2010.
  65. F. Yildirim and H. Liu, "A practical double directional channel model for 60 GHz wireless communication networks," in Proc. IEEE ICC'10, May 23-27, 2010.
  66. R. Khanna, H. Liu, and H. H. Chen, "Self-organization of wireless sensor network for autonomous control in an IT server platform,"Proc. IEEE ICC'10, May 2010.
  67. R. Whang, H. Liu, and E.-K. Hong, "Multiuser cooperative relay communication employing hierarchical modulation," in Proc. IEEE VTC'10-Spring, May 16-19, 2010.
  68. W. Liu, K. Choi, and H. Liu, "Complexity-reduced channel matrix inversion for MIMO systems in time-varying channels," in Proc. IEEE VTC'10-Spring, May 16-19, 2010.
  69. J. He, Z. Wang, and H. Liu, "Low-complexity memory-reduced MAP decoding for double-binary convolutional turbo code," in Proc. IEEE ISCAS'10, June 2010.
  70. H. Zhang, S. Quan, and H. Liu, "An alternative method to sensor spectral characterization," in Proc. 31st Int. Congress on Imaging Science (ICIS2010), Beijing, May 2010.
  71. C. Hu, P, Chiang, K, Hu, H. Liu, R. Khanna, and J. Nejedlo, "A 90nm-CMOS, 500Mbps, fully-integrated IR-UWB transceiver using pulse injection-locking for receiver phase synchronization," in Proc. 2010 Frequency Integrated Circuits (RFIC) Symposium, Anaheim, CA, May 2010.
  72. S. Baek, R. Ye, C. Hu, S. Redfield, H. Liu, T. Hayes, and P. Chiang "Preliminary study of indoor ultrawideband localization for at-home patient monitoring," in Proc. 1st AMA-IEEE Medical Technology Conf. on Individualized Healthcare, Washington, DC, Mar. 2010. (1-page abstract)
  73. 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.
  74. 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.
  75. 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.
  76. 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.
  77. 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.
  78. 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.
  79. 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.
  80. R. Khanna, H. Liu, H. H. Chen, "Proactive power optimization of sensor networks," in Proc. IEEE ICC’08, May. 2008.

  81. 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.

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

  83. 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

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

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

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

  87. 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.

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

  89. 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.

  90. 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.

  91. 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.

  92. 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.

  93. 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.

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

  95. 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.

  96. 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.

  97. 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.
  98. 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.
  99. 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.
  100. 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.
  101. 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.
  102. 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.
  103. H. Liu, ``Error performance of MIMO systems in frequency-selective Rayleigh fading channels,'' in Proc. of IEEE Globecom'03, Dec. 2003.
  104. 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.
  105. 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.
  106. 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.
  107. 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.
  108. 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.
  109. 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.
  110. 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.
  111. 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.
  112. 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.