Publications

Use of these materials is subject to copyright by:
Elsevier Science
University of California at Riverside (UCR)
World Scientific and Engineering Society Press
Korean Institute of Communications Sciences (KICS)
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
The European Association for Speech, Signal and Image Processing (EURASIP)

Theses

  1. Z. Xu, “Blind channel estimation and multiuser detection for CDMA communications”, Ph.D. Thesis, Stevens Institute of Technology, May 1999.
  2. Z. Xu, “Signal processing and analysis for 500MHz reflection scanning acoustic microscopes”, M.S.E.E. Thesis, Tsinghua University, July 1991.
  3. Z. Xu, “Design of a digital control system for high-precision acoustic microscopes”, B.S.E.E. Thesis, Tsinghua University, July 1989.

 

Contributed Articles

[B1].    Z. Xu, and M. K. Tsatsanis, “Low Complexity Methods for Blind Estimation of Up-link Multipath Channels in Long Code CDMA Communications,” in: Nikos E. Mastorakis, editor, “Recent Advances in Signal Processing and Communications”, pp. 95-100, World Scientific and Engineering Society Press, Athens, Greece, 1999.

[B2].    Z. Xu, “Trends in Ultrawideband Transceiver Design”, Chapter 7 in Ultra-Wideband Wireless Communications and Networks, S. Shen, M. Guizani, R. C. Qiu, and T. Le-Ngoc (editors), John Wiley & Sons, Hoboken, NJ, 2006.

 

Technical Report

[T1].    Z. Xu and B. M. Sadler, “Transmitted reference ultra wideband transceivers for multiuser communication,” Army Research Laboratory Technical Report, ARL-TR-3708, January 2006. .pdf

 

Refereed Journal Articles (citations from ISI Web of Science; how to search)

[J1]         F. Sun, Victor O. K. Li, Z. Diao, and Z. Xu, “Medium access control with physical layer assisted link differentiation,” IEEE Trans. on Vehicular Technology, 2008.

[J2]         P. Liu and Z. Xu, “Blind MMSE-constrained multiuser detection,” IEEE Trans. on Vehicular Technology, vol. 57, no. 1, pp. 608-615, January 2008. .pdf

[J3]         Z. Xu and B. M. Sadler, “Time delay estimation bounds in convolutive random channels,” IEEE Journal of Selected Topics in Signal Processing: Special Issue on Performance Limits of Ultra-Wideband Systems, vol. 1, no. 3, pp. 418-430, October 2007. .pdf

[J4]         J. Tang and Z. Xu, “A novel modulation diversity assisted ultra-wideband communication system,” IEEE Trans. on Signal Processing, vol. 55, no. 8, pp. 4227-4240, August 2007. .pdf

[J5]         J. Tang, Z. Xu, and B. M. Sadler, “Performance analysis of b-bit digital receivers for TR-UWB systems with inter-pulse interference,” IEEE Trans. on Wireless Communications, vol. 6, no. 2, pp. 494-505, February 2007. .pdf

[J6]         Z. Xu and J. Tang, “Blind channel estimation in aperiodic time hopping ultra-wideband communications,” IEEE Trans. on Signal Processing, vol. 54, no. 6, Part 1, pp. 2333-2346, June 2006. .pdf

[J7]         Z. Xu and B. M. Sadler, “Multiuser transmitted reference ultra-wideband communication systems,” IEEE Journal on Selected Areas in Communications: Special Issue on Ultra Wideband Wireless Communications - Theory and Applications, vol. 24, no. 4, Part 1, pp. 766-772, April 2006. .pdf

[J8]         P. Liu and Z. Xu, “POR-based channel estimation for UWB communications,” IEEE Trans. on Wireless Communications, vol. 4, no. 6, pp. 2968-2982, November 2005. .pdf

[J9]         Z. Xu, P. Liu and J. Tang, “A subspace approach to blind multiuser detection for ultra-wideband communication systems,” EURASIP Journal on Applied Signal Processing: Special Issue on UWB - State of the Art, vol. 2005, no. 3, pp. 413-425, March 2005. .pdf

[J10]      Z. Xu, J. Tang and P. Liu, “Multiuser channel estimation for ultra-wideband systems using up to the second order statistics,” EURASIP Journal on Applied Signal Processing: Special Issue on UWB - State of the Art, vol. 2005, no. 3, pp. 273-286, March 2005. .pdf

[J11]      Z. Xu, “Effects of imperfect blind channel estimation on performance of linear CDMA receivers,” IEEE Trans. on Signal Processing, vol. 52, no. 10, pp. 2873-2884, October 2004. .pdf

[J12]      Z. Xu and X. Wang, “Large-sample performance of blind and group-blind multiuser detectors: a perturbation perspective,” IEEE Trans. on Information Theory, vol. 50, no. 10, pp. 2389-2401, October 2004. .pdf

[J13]      P. Liu and Z. Xu, “Joint performance study of channel estimation and multiuser detection for uplink long-code CDMA systems,” EURASIP Journal on Wireless Communications and Networking: Special Issue on Innovative Signal Transmission and Detection Techniques for Next Generation Cellular CDMA System, vol. 2004, no. 1, pp. 98-112, August 2004. .pdf

[J14]      Z. Xu, “Statistical performance of a data-based covariance estimator,” IEEE Trans. on Vehicular Technology, vol. 53, no. 3, pp. 939-943, May 2004. .pdf

[J15]      Z. Xu, P. Liu and X. Wang, “Blind multiuser detection: from MOE to subspace methods,” IEEE Trans. on Signal Processing, vol. 52, no. 2, pp. 510-524, February 2004. .pdf

[J16]      Z. Xu, P. Liu and M. Zoltowski, “Diversity assisted channel estimation and multiuser detection for downlink CDMA with long spreading codes,” IEEE Trans. on Signal Processing, vol. 52, no. 1, pp. 190-201, January 2004. .pdf

[J17]      Z. Xu and P. Liu, “Blind multiuser detection by kurtosis maximization/minimization,” IEEE Signal Processing Letters, vol. 11, no. 1, pp. 1-4, January 2004. .pdf

[J18]      C. Kim, Z. Xu and H. J. Kim, “Sliding multiple phase differential detection of trellis-coded MDPSK-OFDM,” IEICE Trans. Communications: Joint Special Issue on Recent Progress in Optoelectronics and Communications, vol. E86-B, no. 5, pp. 1591-1600, May 2003. . pdf

[J19]      Z. Xu, “On the second-order statistics of the weighted sample covariance matrix,” IEEE Trans. on Signal Processing, vol. 51, no. 2, pp. 527-534, February 2003. .pdf

[J20]      Z. Xu and P. Liu, “Code constrained blind detection of CDMA signals in multipath channels,” IEEE Signal Processing Letters, vol. 9, no. 12, pp. 389-392, December 2002. .pdf

[J21]      Z. Xu, “Further study on MOE-based multiuser detection in unknown multipath,” EURASIP Journal on Applied Signal Processing: Multiuser Detection and Blind Estimation, pp. 1377-1386, December 2002. .pdf

[J22]      Z. Xu, “Perturbation analysis for subspace decomposition with applications in subspace-based algorithms,” IEEE Trans. on Signal Processing, vol. 50, no. 11, pp. 2820-2830, November 2002. .pdf  

[J23]      Z. Xu, “Performance analysis of blind channel estimation for precoded multiuser systems,” Journal of Communications and Networks, vol. 4, no. 3, pp. 189-198, September 2002. .pdf

[J24]      P. Ahn, C. Kim, H. Kim and Z. Xu, “Trellis-coded pi/8 shift 8PSK-OFDM with sliding multiple symbol detection,” The Korean Institute of Maritime Information & Communication Science (KIMICS), vol. 6, no. 4, pp. 535-543, August 2002.

[J25]      Z. Xu, “Asymptotic performance of subspace methods for synchronous multirate CDMA systems,” IEEE Trans. on Signal Processing, vol. 50, no. 8, pp. 2015-2026, August 2002. .pdf

[J26]      Z. Xu, “Low complexity multiuser channel estimation with aperiodic spreading codes,” IEEE Trans. on Signal Processing, vol. 49, no. 11, pp. 2813-2822, November 2001. .pdf 

[J27]      Z. Xu, “Improved constraint for multipath mitigation in constrained MOE multiuser detection,” Journal of Communications and Networks: Signal Processing for Multiuser Wireless Communications, vol. 3, no. 3, pp. 249-256, September 2001. .pdf  

[J28]      Z. Xu, “Asymptotically near-optimal blind estimation of multipath CDMA channels,” IEEE Trans. on Signal Processing, vol. 49, no. 9, pp. 2003-2017, September 2001. .pdf

[J29]      Z. Xu, “Blind identification of co-existing synchronous and asynchronous users for CDMA systems,” IEEE Signal Processing Letters, vol. 8, no. 7, pp. 212-214, July 2001. .pdf

[J30]      Z. Xu and M. Tsatsanis, “Blind adaptive algorithms for minimum variance CDMA receivers,” IEEE Trans. on Communications, vol. 49, no. 1, pp. 180-194, January 2001. .pdf

[J31]      M. Tsatsanis and Z. Xu, “Pilot symbol assisted modulation in frequency selective fading wireless channels,'' IEEE Trans. on Signal Processing, vol. 48, no. 8, pp. 2353-2365, August 2000. .pdf

[J32]      Z. Xu and M. Tsatsanis, “Blind channel estimation for long code multiuser CDMA systems,” IEEE Trans. on Signal Processing, vol. 48, no. 4, pp. 988-1001, April 2000. .pdf

[J33]      M. Tsatsanis and Z. Xu, “Constrained optimization methods for direct blind equalization,” IEEE Journal on Selected Areas in Communications (special issue on wireless communications series), vol. 17, no. 3, pp. 424-433, March 1999. .pdf

[J34]      Z. Xu and M. Tsatsanis, “Adaptive minimum variance methods for direct blind multichannel equalization,” EURASIP Signal Processing, vol. 73, no. 1-2, pp. 125-138, February 1999. .pdf

[J35]      M. Tsatsanis and Z. Xu, “Performance analysis of minimum variance CDMA receivers,” IEEE Trans. on Signal Processing, vol. 46, no. 11, pp. 3014-3022, November 1998. .pdf

[J36]      Chen Gelin, Hu Sizheng, Luo Shuyun, Zhang Keqian, Shen Zhongming and Xu Zhengyuan, “The study on a 150MHz intelligent reflection scanning acoustic microscope and its image processing function,” Journal of Applied Sciences, vol. 11, no. 3, pp. 226-234, July 1993 (in Chinese).

[J37]      Chen Gelin, Hu Sizheng, Luo Shuyun, Zhang Keqian, Shen Zhongming and Xu Zhengyuan, “A 150MHz intelligent reflection scanning acoustic microscope and its image processing,” Applied Acoustics, vol. 11, no. 3, pp. 6-11, May 1992 (in Chinese).

[J38]      Chen Gelin, Hu Sizheng, Luo Shuyun, Zhang Keqian, Shen Zhongming and Xu Zhengyuan, “The intelligent scanning acoustic microscope type THSAM-5 and its applications,” Nondestructive Testing, vol. 14, no. 5, pp. 121-124, May 1992 (in Chinese).

 

Conference Papers

[C1]          Z. Xu, N. Liu, and B. M. Sadler, “A simple closed-form linear source localization algorithm,” Proc. of Milcom, Orlando, Florida, October 29-31, 2007. .pdf

[C2]          Z. Xu and B. M. Sadler, “Time delay estimation bounds in wideband random channels,” Proc. of Milcom, Orlando, Florida, October 29-31, 2007. .pdf

[C3]          Z. Xu, G. Chen, F. Abou-Galala, and M. Leonardi, “Experimental performance evaluation of non-line-of-sight ultraviolet communication systems,” Proc. SPIE Photonics and Optics – Free Space Laser Communications VII, vol. 6709, San Diego, CA, August 28-30, 2007. .pdf

[C4]          P. Liu and Z. Xu, “Constrained cross-cumulant based multiuser detection for uplink CDMA,” Proc. IEEE Workshop on Statistical Signal Processing (SSP), Madison, Wisconsin, August 26-29, 2007. .pdf

[C5]          F. Sun, V. O. K. Li, Z. Diao, and Z. Xu, “Contention-based medium access control with physical layer assisted link differentiation,” Prof. IEEE ICC, Glasgow, Scotland, June 24-28, 2007. .pdf

[C6]          Z. Xu, “Approximate performance analysis of wireless ultraviolet links,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., Honolulu, Hawaii, April 15-20, 2007. .pdf

[C7]          B. M. Sadler, L. Huang, and Z. Xu, “Ziv-Zakai time delay estimation bound for ultra-wideband signal,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., Honolulu, Hawaii, April 15-20, 2007. .pdf

[C8]          F. Sun, V. O. K. Li, Z. Diao, and Z. Xu, “A new cross-layer designed multipolling MAC protocol over wireless LANs,” Prof. IEEE WCNC, Hong Kong, China, March 11-15, 2007. .pdf

[C9]          Y. Li and Z. Xu, “Transmitted reference schemes for wireless optical communications,” Prof. IEEE Globecom, San Francisco, CA, November 27-30, 2006. .pdf

[C10]      F. Sun, V. O. K. Li, Z. Diao, and Z. Xu, “Medium access control with physical layer assisted loss differentiation,” Prof. IEEE Globecom, San Francisco, CA, November 27-30, 2006. .pdf

[C11]      Z. Xu, A. Swami and B. M. Sadler, “Performance study of a high-rate multiuser transmitted reference ultra-wideband transceiver,” Proc. of Milcom, Washington DC, October 23-25, 2006 (invited). .pdf

[C12]      J. Tang and Z. Xu, “Performance study of a near-optimum modulation diversity assisted ultra-wideband receiver,” Proc. of IEEE Intl. Conf. on Ultra-Wideband, Waltham, Massachusetts, September 24-27, 2006. .pdf

[C13]      P. Liu, Z. Xu and B. M. Sadler, “Narrowband interference suppression of an MTR-UWB transceiver,” Proc. of IEEE Radio and Wireless Symposium, San Diego, January 17-19, 2006 (invited). .pdf

[C14]      B. M. Sadler, Z. Xu and J. Tang, “Data detection performance of an MTR-UWB receiver in the presence of timing errors,” Proc. of 37th Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, October 30-November 2, 2005 (invited). .pdf

[C15]      L. Liu and Z. Xu, “Joint packet scheduling and channel allocation for wireless communications,” Proc. of 37th Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, October 30-November 2, 2005. .pdf

[C16]      Z. Xu, A. Swami and B. M. Sadler, “A multiuser transmitted reference UWB transceiver for high data rate communication,” Proc. of Milcom, NJ, October 17-20, 2005. .pdf

[C17]      Z. Xu and B. M. Sadler, “Code aided near full rate multiuser TR-UWB systems,” Proc. of IEEE SPAWC, New York, June 5-8, 2005 (invited). .pdf

[C18]      J. Tang, Z. Xu and B. M. Sadler, “Digital receiver for TR-UWB systems with inter-pulse interference,” Proc. of IEEE SPAWC, New York, June 5-8, 2005. .pdf

[C19]      Z. Xu, B. M. Sadler and J. Tang, “Data detection for UWB transmitted reference systems with inter-pulse interference,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., Philadelphia, PA, March 19-23, 2005. .pdf

[C20]      J. Tang and Z. Xu, “A novel modulation diversity assisted ultra wideband communication system,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., Philadelphia, PA, March 19-23, 2005. .pdf

[C21]      P. Liu and Z. Xu, “Performance of POR multiuser detection for UWB communications,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., Philadelphia, PA, March 19-23, 2005. .pdf

[C22]      J. Tang and Z. Xu, “Statistical performance of correlation-matching based channel estimators for aperiodic time hopping UWB systems,” Proc. of IEEE Global Telecommunications Conference (Globecom), Dallas, Texas, November 29-December 3, 2004. .pdf

[C23]      Z. Xu, “Regularization enhanced fast convergence for POR-based multiuser detection,” Proc. of IEEE VTC Conf., Los Angeles, CA, September 26-29, 2004. .pdf

[C24]      Z. Xu and L. Liu, “Power allocation for multi-band OFDM UWB communication networks,” Proc. of IEEE VTC Conf., Los Angeles, CA, September 26-29, 2004. .pdf

[C25]      P. Liu and Z. Xu, “POR channel estimation for UWB communications,” Proc. of IEEE 6th CAS Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication, pp. 25-28, Shanghai, China, May 31-June 2, 2004. .pdf

[C26]      J. Tang and Z. Xu, “Blind channel estimation in aperiodic time hopping ultra-wideband systems,” Proc. of IEEE 6th CAS Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication, pp. 337-340, Shanghai, China, May 31-June 2, 2004. .pdf

[C27]      Z. Xu, “Performance of CDMA receivers under imperfect channel estimation”, Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. IV, pp. 969-972, Quebec, Canada, May 17-21, 2004. .pdf

[C28]      P. Liu and Z. Xu, “Temporal diversity assisted blind channel estimation for downlink long-code CDMA systems”, Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. IV, pp. 953-956, Quebec, Canada, May 17-21, 2004. .pdf

[C29]      J. Tang and Z. Xu, “Multidimensional orthogonal design for ultra-wideband downlink”, Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. IV, pp. 541-544, Quebec, Canada, May 17-21, 2004. .pdf

[C30]      P. Liu, Z. Xu and J. Tang, “Minimum variance multiuser detection for impulse radio UWB systems,” Proc. of IEEE Conf. on Ultra Wideband Systems and Technologies, pp. 111-115, Reston, Virginia, November 16-19, 2003. .pdf

[C31]      P. Liu, Z. Xu and J. Tang, “Subspace multiuser receivers for UWB communication systems,” Proc. of IEEE Conf. on Ultra Wideband Systems and Technologies, pp. 116-120, Reston, Virginia, November 16-19, 2003. .pdf

[C32]      J. Tang, Z. Xu and P. Liu, “Mean and covariance based estimation of multiple access UWB channels,” Proc. of IEEE Conf. on Ultra Wideband Systems and Technologies, pp. 458-462, Reston, Virginia, November 16-19, 2003. .pdf

[C33]      Z. Xu and P. Liu, “A subspace approach to blind estimation of ultra-wideband channels,” Proc. of 37th Asilomar Conf. on Signals, Systems, and Computers, pp. 1249-1253,  Pacific Grove, CA, November 10-12, 2003. .pdf

[C34]      Z. Xu, “Blind channel estimation via subspace approximation,” Proc. of 37th Asilomar Conf. on Signals, Systems, and Computers, pp. 1653-1657, Pacific Grove, CA, November 10-12, 2003.  .pdf

[C35]      Z. Xu, P. Liu and J. Tang, “Blind multiuser detection for impulse radio UWB systems,” Proc. of IEEE Topical Conference on Wireless Communication Technology, pp. s27p08, Honolulu, Hawaii, October 15-17, 2003..pdf

[C36]      Z. Xu, J. Tang and P. Liu, “Blind channel estimation for multiple access UWB communications based on periodic time hopping and pulse-rate modeling,” Proc. of IEEE Topical Conference on Wireless Communication Technology, pp. s27p09, Honolulu, Hawaii, October 15-17, 2003. .pdf

[C37]      P. Liu and Z. Xu “Blind adaptive multiuser detection for uplink long-code CDMA systems,'' Proc. of IEEE Workshop on Statistical Signal Processing, pp. 329-332, St. Louis, Missouri, Sept. 28-Oct. 1, 2003. .pdf

[C38]      Z. Xu, J. Tang and P. Liu “Frequency-domain estimation of multiple access ultra-wideband signals,” Proc. of IEEE Workshop on Statistical Signal Processing, pp. 65-68, St. Louis, Missouri, Sept. 28-Oct. 1, 2003. .pdf

[C39]      N. Yu and Z. Xu, “On the second-order statistics of the sample covariance,” Proc. of 14th IEEE International Symposium on Personal Indoor and Mobile Radio Communication, vol. 2, pp. 2953-2957, Beijing, China, September 7-10, 2003. .pdf

[C40]      P. Liu, Z. Xu and N. Yu, “On performance study of data based multiuser detection methods for uplink long-code cdma systems,” Proc. of 14th IEEE International Symposium on Personal Indoor and Mobile Radio Communication, vol. 2, pp. 2910-2914, Beijing, China, September 7-10, 2003. .pdf

[C41]      Z. Xu, P. Liu and N. Yu, “Performance of channel estimation assisted linear multiuser receivers for downlink CDMA systems with long spreading codes,” Proc. of 14th IEEE International Symposium on Personal Indoor and Mobile Radio Communication, vol. 2, pp. 2978-2982, Beijing, China, September 7-10, 2003. .pdf

[C42]      P. Liu and Z. Xu “Linear multiuser detection for uplink long-code CDMA systems,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. IV, pp. 97-100, Hong Kong, April 6-10, 2003. .pdf

[C43]      Y. Deng and Z. Xu “Performance of a low-complexity downlink channel estimator for long-code CDMA systems,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. IV, pp. 117-120, Hong Kong, April 6-10, 2003. .pdf

[C44]      P. Liu and Z. Xu “A globally convergent CMA-based approach to blind multiuser detection,” Proc. of 36th Asilomar Conf. on Signals, Systems, and Computers, pp. 634-638, Pacific Grove, CA, November 3-6, 2002. .pdf

[C45]      P. Liu and Z. Xu, “Channel estimation and multiuser detection for long code CDMA,” Proc. of 36th Asilomar Conf. on Signals, Systems, and Computers, pp. 1453-1457, Pacific Grove, CA, November 3-6, 2002. .pdf

[C46]      Z. Xu, P. Liu and X. Wang, “Towards closing the gap between MOE and subspace methods,” Proc. of 36th Asilomar Conf. on Signals, Systems, and Computers, pp. 689-693, Pacific Grove, CA, November 3-6, 2002. .pdf

[C47]      Z. Xu and P. Liu, “Kurtosis based maximization/minimization approach to blind equalization for DS/CDMA systems in unknown multipath,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. III, pp. 2585-2588, Orlando, Florida, May 13-17, 2002. .pdf

[C48]      P. Liu and Z. Xu, “Correlation matching in channel estimation for multirate DS/CDMA,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. III, pp. 2581-2584, Orlando, Florida, May 13-17, 2002. .pdf

[C49]      T. Wang and Z. Xu, “Performance analysis of blind channel estimation for precoded multirate multiuser systems,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. III, pp. 2741-2744, Orlando, Florida, May 13-17, 2002. .pdf

[C50]      Z. Xu and T. Wang, “Blind detection of CDMA signals based on Kalman filter,” Proc. of 35th Asilomar Conf. on Signals, Systems, and Computers, vol. 2, pp. 1545-1549, Pacific Grove, CA, November 5-7, 2001. .pdf

[C51]      Z. Xu, “Perturbation study on MOE-based multiuser detection,” Proc. of 35th Asilomar Conf. on Signals, Systems, and Computers, vol. 2, pp. 1733-1737, Pacific Grove, CA, November 5-7, 2001. .pdf

[C52]      Z. Xu and D. Reitz, “Subspace-based channel estimation for CDMA downlink with aperiodic spreading codes and multiple subchannels,” Proc. of 35th Asilomar Conf. on Signals, Systems, and Computers, vol. 2, pp. 1728-1732, Pacific Grove, CA, November 5-7, 2001. .pdf

[C53]      Z. Xu and P. Liu, “Code constrained CMA-based multirate multiuser detection,” Proc. of 35th Asilomar Conf. on Signals, Systems, and Computers, vol. 2, pp. 1455-1459, Pacific Grove, CA, November 5-7, 2001 (invited). .pdf

[C54]      Z. Xu and P. Liu, “Constrained CMA-based multiuser detection under unknown multipath,” Proc. of 12th IEEE International Symposium on Personal Indoor and Mobile Radio Communication, pp. A21-25, San Diego, CA, September 30-October 3, 2001. .pdf

[C55]      Z. Xu, “Computationally efficient multiuser detection for aperiodically spreading CDMA systems,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. IV, pp. 2249-2252, Salt Lake City, Utah, May 7-11, 2001. .pdf

[C56]      P. Liu and Z. Xu, “Convergence analysis of a new blind equalization algorithm with M-ary PSK channel inputs,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. IV, pp. 2529-2532, Salt Lake City, Utah, May 7-11, 2001. .pdf

[C57]      Z. Xu, “Blind channel estimation for precoded variable bit-rate multiuser systems,” Proc. of 34th Asilomar Conf. on Signals, Systems, and Computers, vol. 2, pp. 1273-1277, Pacific Grove, CA, October 29-November 1, 2000. .pdf

[C58]      Z. Xu, “Improved constrained optimization method for CDMA systems,” Proc. of 34th Asilomar Conf. on Signals, Systems, and Computers, vol. 2, pp. 1293-1297, Pacific Grove, CA, October 29-November 1, 2000. .pdf

[C59]      Z. Xu, “Asymptotically optimal CDMA receiver: perfect MAI cancellation,” Proc. of IEEE Wireless Communications and Networking Conference, vol. 3, pp. 1496-1500, Chicago, IL, September 23-28, 2000. .pdf

[C60]      Z. Xu, “New cost function for blind estimation of MPSK signals,” Proc. of IEEE Wireless Communications and Networking Conference, vol. 3, pp. 1501-1505, Chicago, IL, September 23-28, 2000. .pdf

[C61]      M. Tsatsanis, Z. Xu and X. Lu, “Blind multiuser detectors for dual rate DS-CDMA systems over frequency selective channels,” Proc. of European Signal Processing Conference, vol. 2, pp. 631-634, Tampere, Finland, September 5-8, 2000. .pdf

[C62]      Z. Xu and P. Liu, “Demodulation of amplitude modulated signals in the presence of multipath,” Proc. of 10th IEEE Workshop on Statistical Signal and Array Processing, pp. 33-37, Pocono Manor, Pennsylvania, August 14-16, 2000. .pdf

[C63]      Z. Xu and P. Liu, “New criteria for blind equalization of M-PSK signals,” Proc. of 10th IEEE Workshop on Statistical Signal and Array Processing, pp. 692-696, Pocono Manor, Pennsylvania, August 14-16, 2000. .pdf

[C64]      Z. Xu, “CDMA downlink channel estimation with unknown random spreading codes,” Proc. of IEEE Intl. Conf. on Third Generation Wireless Communications, pp. 313-318, San Francisco, CA, June 14-16, 2000. .pdf

[C65]      Z. Xu, “Projection-based multiuser receiver over frequency selective channels,” Proc. of Intl. Conf. on Information Technology: Coding and Computing, pp. 92-97, Las Vegas, Nevada, March 27-29, 2000 (invited). .pdf

[C66]      M. Tsatsanis and Z. Xu, “Adaptive blind interference cancellation in CDMA systems,” Proc. of Global Telecommunications Conf., pp. 487-491, Rio de Janeiro, Brazil, December 5-9, 1999. .pdf

[C67]      Z. Xu and M. Tsatsanis, “Low complexity methods for blind estimation of up-link multipath channels in long code CDMA communications,” Proc. of 3rd IMACS International Multiconference on: Circuits, Systems, Communications and Computers, pp. 95-100, Athens, Greece, July 4-8, 1999 (invited). .pdf

[C68]      Z. Xu and M. Tsatsanis, “On correlation matching approaches for multipath parameter estimation in multiuser CDMA systems,” Proc. of 2nd IEEE Workshop on Signal Processing Advances in Wireless Communications, pp. 38-41, Annapolis, MD, May 9-12, 1999. .pdf

[C69]      Z. Xu and M. Tsatsanis, “Blind channel estimation for multiuser CDMA systems with long spreading codes,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. 5, pp. 2531-2534, Phoenix, Arizona, March 15-19, 1999. .pdf

[C70]      Z. Xu and M. Tsatsanis, “Blind stochastic gradient methods for optimal minimum variance CDMA receivers,” Proc. of 32nd Asilomar Conf. on Signals, Systems, and Computers, vol. 1, pp. 660-664, Pacific Grove, CA, Nov. 1-4, 1998. .pdf

[C71]      M. Tsatsanis and Z. Xu, “Blind channel estimation for CDMA systems with orthogonal modulation,” Proc. of SPIE's 43rd International Symposium, pp. 16-25, San Diego, California, July 19-24, 1998 (invited). .pdf

[C72]      Z. Xu and M. Tsatsanis, “Adaptive minimum variance methods for direct blind multichannel equalization,” Proc. of IEEE Intl. Conf. on Acoustics, Speech, and Signal Proc., vol. IV, pp. 196-199, Seattle, WA, May 12-15, 1998. .pdf

[C73]      M. Tsatsanis and Z. Xu, “Pilot symbol assisted modulation in frequency selective fading wireless channels,” Proc. of 32nd Conf. on Info. Sciences and Systems, vol. 2, pp. 636-641, Princeton Univ., Princeton NJ, March 18-20, 1998. .pdf

[C74]      M. Tsatsanis and Z. Xu, “Constrained optimization methods for blind equalization of multiple FIR channels,” Proc. of 31th Asilomar Conf. on Signals, Systems, and Computers, vol.1, pp. 128-132, Pacific Grove, CA, Nov. 3-6, 1997 (invited). .pdf

[C75]      M. Tsatsanis and Z. Xu, “Performance analysis of minimum variance CDMA receivers,” Proc. of 13th Intl. Conf. on Digital Signal Processing, pp. 379-382, Santorini, Greece, July 2-4, 1997 (invited). .pdf

[C76]      M. Tsatsanis and Z. Xu, “On minimum output energy CDMA receivers in the presence of multipath,” Proc. of 31st Conf. on Info. Sciences and Systems, pp. 724-729, Johns Hopkins Univ., Baltimore MD, March 19-21, 1997. .pdf

Posters

[P1]        L. Huang, Z. Xu, and B. M. Sadler, “Simplified Ziv-Zakai time delay estimation bound for ultra-wideband signals,” Workshop on Short-Range Ultra-Wideband Radio Systems, Organized by University of Southern California, Santa Monica, California, April 11-12, 2006 (invited).

[P2]        B. M. Sadler, J. Tang, and Z. Xu, “Unified performance analysis for ultra-wideband receivers with timing jitter,” Workshop on Short-Range Ultra-Wideband Radio Systems, Organized by University of Southern California, Santa Monica, California, April 11-12, 2006 (invited).

[P3]        G. Fraidenraich, Z. Xu, and J. C. Cioffi, “Ultra-wideband channel capacity under correlated multipath fading,” IEEE Communication Theory Workshop (CTW), Sedona, Arizona, May 20-23, 2007.