Publications

Thesis

Zhiqiang Liu, Space-Time Coding for Broadband Wireless Communications, Ph. D Thesis, University of Minnesota, December, 2001.

Book

G. B. Giannakis, Z. Liu, X. Ma and S. Zhou, Space-Time Coding for Broadband Wireless Communucations, New York: John Wiley, 2006

Journal Papers

Q. Zhu and Z. Liu, ``Low-Complexity Multi-Channel Estimation Based on Optimal Constant-Modulus Training", IEEE Transaction on Wireless Communications, Jan 2006 (Submitted).
Q. Zhu and Z. Liu, ``Optimal Pilot Superimposition for Zero-Padded Block Transmissions", IEEE Transactions on Wireless Communication, Vol. 5, No. 8, August, 2006.
Q. Zhu and Z. Liu, ``Minimum Interference Blind Time-Offset Estimation for OFDM Systems", IEEE Transaction on Wirelss Communications, Vol. 5, No. 8, August, 2006.
Q. Zhu and Z. Liu, ``Optimal Design of Constant-Modulus Training Sequences with Constrained Length", IEEE Transactions on Communications, Sept. 2006.
Z. Liu, ``Maximum Diversity in Single-Carrier Frequency-Domain Equalization", IEEE Transactions on Infomation Theory, Vol. 51, No. 8, August, 2005.
Z. Liu, B. Weng, Q. Zhu, ``Frequency Offset Estimation for Differential OFDM," IEEE Transactions on Wireless Communications, vol. 4, no. 4, July, 2005.
Q. Ma, C. Tepedelenlioglu, and Z. Liu, ``Differential Space-Time-Frequency Coded OFDM with Maximum Multipath Diversity," IEEE Transactions on Wireless Communications, vol 4,no. 5, pp. 2232-2243, Spet. 2005.
Z. Liu, Y. Xin and G. B. Giannakis, ``Space-Time-Frequency Coding for Frequency Selective Fading Channels," IEEE Transactions on Signal Processing, vol. 50, no. 8, pp. 2465-2476, September 2002.
Z. Liu, Y. Xin and G. B. Giannakis, ``Linear Constellation Precoded OFDM with Maximum Multipath Diversity and Coding Gains," IEEE Transactions on Communications, vol. 51, no. 3, pp. 416-427, March 2003.
Z. Liu and G. B. Giannakis, ``Block Differentially Encoded OFDM with Maximum Multipath Diversity," IEEE Transactions on Wireless Communications,vol.2, no. 3, pp. 420-423, May 2003.
Z. Liu, X. Ma and G. B. Giannakis, ``Space-Time Coding and Kalman Filtering for Diversity Transmissions through Time-Selective Fading Channels," IEEE Transactions on Communications, vol. 50, no. 2, pp. 183-186, February 2002.
A. Stamoulis, Z. Liu and G. B. Giannakis, ``Space-Time Coded Generalized Multicarrier CDMA with Block-Spreading for Multirate Services," IEEE Transactions on Signal Processing, vol. 50, no. 1, pp. 119-129, January 2001.
Z. Liu, G. B. Giannakis and B. L. Hughes, ``Double Differential Space-Time Block Coding For Time-Varying Fading Channels," IEEE Transactions on Communications, vol. 49, no. 9, pp. 1529-1539, September 2001.
Z. Liu, G. B. Giannakis, S. Barbarossa, A. Scaglione, ``Transmit-Antennae Space-Time Block Coding for Generalized OFDM in the Presence of Unknown Multipath," IEEE Journal on Selected Areas in Communications, vol. 19, no. 7, pp. 1352-1364, July 2001.
Z. Liu and G. B. Giannakis, ``Space-Time Block Coded Multiple Access through Frequency Selective Fading Channels," IEEE Transactions on Communications, vol. 49, no. 6, pp. 1033-1044, June 2001.
H. Chen and Z. Liu, ``Zero-Insertion Adaptive Minimum Mean-Square Error (MMSE) Receiver for Asynchronous CDMA Multiuser Detection" IEEE Transactions on Vehicular Technology, vol. 50, no. 2, pp. 557-569, March 2001.
Z. Liu, G. B. Giannakis, B. Muquet and S. Zhou, ``Space-Time Coding for Broadband Wireless Communications," Wireless Communications and Mobile Computing, vol. 1, no. 1, pp. 33-53, Wiley, January-March 2001.
H. Chen and Z. Liu, ``Asynchronous Block-based Minimum Mean Square Error (B-MMSE) CDMA Multi-user Detection,", International Journal of Communication Systems, vol. 11, no. 6, pp. 395-401, Wiley, Nov.-Dec 1998.
H. Chen and Z. Liu, ``A CDMA Multiuser Detector with Block Channel Coding and its Performance Analysis under Multiple Access Interference,", IEICE Transactions on Communications, vol. E81-B, no. 5, pp. 1095-1101, May 1998.

Conference Papers

Q. Zhu and Z. Liu,``Minimum-Interference Time-Offset Estimation for OFDM Systems", Proc. of VTC, Los Angeles, Sept. 26-29, 2004.
Z. Liu and B. Weng, `` Full-Range Blind Carrier Frequency Offset Estimation for Differential OFDM", Proc. of ICC, Paris, France, Jun 20-24, 2004.
Liu and B. Weng, ``Finite-Alphabet Based Blind Carrier Frequency Offset Estimation for Differentially Coded OFDM", Proc. of Globecom, San Francisco, California, Dec 01-05, 2003.
Ma, C. Tepedelenlioglu and Z. Liu, ``Full Diversity Block Diagonal Codes for Differential Space-Time-Frequency Coded OFDM ," Proc. of Globecom, San Francisco, California, Dec 01-05, 2003.
Q. Ma, C. Tepedelenlioglu and Z. Liu, ``Differential Space-Time-Frequency Coded OFDM with Maximum Diversity," Proc. of 37th Annual Conf. on Info Science and Systems, Baltimore, Maryland, March 12-14, 2003.
Z. Liu, Y. Xin and G. B. Giannakis, ``Space-Time-Frequency Block Coded OFDM
with Subcarrier Grouping and Constellation Precoding," Proc. of Intl. Conf. on ASSP., Orlando, FL, May 13 -17, 2002.
Z. Liu, Y. Xin and G. B. Giannakis, ``Space-Time-Frequency Coding over Frequency Selective Fading Channels," Proc. of Vehicular Technology Conf. Birmingham, AL, May 4-9, 2002.
Y. Xin, Z. Liu, and G. B. Giannakis, ``High-Rate Layered Space-Time Coding Based on Constellation Rotation," Proc. of Wireless Communication and Network Conf. Orlando, FL, March 17-21, 2002.
Z. Liu, and G. B. Giannakis, ``Block Differentially Encoded OFDM with Maximum Multipath Diversity," Proc. of 39th Allerton Conf., Univ. if Illinois at U-C, Monticello, IL, October 3-5, 2001.
Z. Liu, Y. Xin and G. B. Giannakis, ``Linear Constellation Precoding for OFDM with Maximum Multipath Diversity and Coding Gains," Proc. of 35th Asilomar Conf. on Signals, Systems, and Computers,Pacific Grove, CA, November 4-7, 2001, pp. 1445-1449.
Z. Liu and G. B. Giannakis, ``Layered Space-Time Coding Design for High Data Rate Transmissions," Proc. of MILCOM Conf.,McLean, VA, October 28-31, 2001.
Z. Liu and A. Stamoulis and G. B. Giannakis, ``Supporting Integrated Services in Wireless Networks with Space-Time Block-Coded Transmissions," Proc. of 34th Asilomar Conf. on Signals, Systems, and Computers, pp. 1250-1254, Pacific Grove, CA, Oct. 29-Nov. 1, 2000.
Z. Liu, X. Ma and G. B. Giannakis, ``Space-Time Coding and Kalman Filtering for Diversity Transmissions through Time-Selective Fading Channels," Proc. of MILCOM Conf., Los Angeles, CA, Oct. 22-25, 2000.
A. Stamoulis, Z. Liu and G. B. Giannakis, ``Space-Time Coded Generalized Multicarrier CDMA with Block-Spreading for Multirate Services," Proc. of 38th Allerton Conf., Univ. of Illinois at U-C, Monticello, IL, Sept. 2000.
Z. Liu, G. B. Giannakis and B. L. Hughes, ``Double Differential Space-Time Block Coding for Time-Selective Fading Channels," Proc. of Wireless Communications and Networking Conf., pp. 13-17, Chicago, IL, September 23-28, 2000.
A. Stamoulis, Z. Liu and G. B. Giannakis, ``Provision of QoS in Wireless Networks Based on Multirate Multipath-Transparent Space-Time Block Coding,'' Proc. of 34th Conf. on Info. Sciences and Systems (CISS'00), Princeton Univ., Princeton, NJ, March 15-17, 2000 (presented).
Z. Liu and G. B. Giannakis, ``Space-Time Coding with Transmit Antennas for Multiple Access regardless of Frequency-Selective Multipath," Proc. of the 1st Sensor Array and Multichannel SP Workshop, pp. 178-182, Boston, MA, March 15-17, 2000.
Z. Liu, G. B. Giannakis, A. Scaglione, and S. Barbarossa, ``Block Precoding and Transmit-Antenna Diversity for Decoding and Equalization of Unknown Multipath Channels," Proc. of 33rd
Asilomar Conf. on Signals, Systems, and Computers, vol.2, pp. 1557-1561, Pacific Grove, CA, Nov. 1-4, 1999.
Z. Liu, A. Scaglione, S. Barbarossa and G. B. Giannakis, ``Block Space-Time Antenna Precoding/Decoding for generalized multicarrier communications in unknown multipath," Proc. of 37th Annual Allerton Conf. on Communication, Control, and Computing, pp. 1016-1025, Univ. of Illinois at U-C, Monticello, Il, Sept. 1999.
H. Chen and Z. Liu, ``A Novel CDMA Multiuser Detector with Immunity against Decision Error Propagation," Proc. of Vehicular Technology Conference, pp. 567-571, Phoneix, AZ, May 1997.
Z. Liu and J. Song, "Design and Principle of SSAR Echo Simulation", Proc. of the 5th National Conference on Remote Sensing, Remote Control and Remote Measurement,Shenzheng, China, May 7-9, 1994.