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Associate
Professor
BSc (CUHK),
MSEE, PhD (Purdue)
SMIEEE
Tel:
(852) 2609-8455
Fax:
(852) 2603-5032
Email: t m
l o k @ i e . c u h k . e d u . h k
http://personal.ie.cuhk.edu.hk/~tmlok/
Tat M. Lok
received the BSc degree in electronic engineering from the Chinese University of Hong
Kong, and the MSEE degree and the PhD
degree in electrical engineering from Purdue University. He
was a post-doctoral research associate at Purdue University.
In 1996, he
joined the Chinese University of Hong
Kong, where he is currently an associate
professor. His research interests include communication theory, signal
processing for communications and CDMA systems. He has served on TPCs
of different international conferences including IEEE ICC, VTC,
Globecom, WCNC, ISIT, and etc. He was a co-chair of the Wireless Access
Track of IEEE VTC’04 Fall. He also served as an associate editor
for the IEEE Transactions on Vehicular Technology from 2002 to 2008.
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Wireless Communications
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Communication Theory
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Signal Processing for Communications
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CDMA Systems
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Intelligent computing
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Power control strategies for cooperative wireless systems
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Design of
wireless cooperation via flow calculus
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Optimal
assignment of resources for multiuser communication systems
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Code selection
and scheduling for multicarrier CDMA systems
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MC/DS/CDMA as
the radio technology for wireless multimedia communication
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W. P. Tam, T. M. Lok and T. F. Wong “Flow Optimization in Parallel Relay Networks
with Cooperative Relaying,” IEEE Trans.
Wireless Comm., Jan. 2009.
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Jun Zhang and
T. M. Lok, “Cooperative Protocols for
Multiple-Source Multiple-Relay Wireless Systems,”
International Journal of Sensor Networks, 2008.
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Kenon
Zhou and T. M. Lok, “A Relay Selection Scheme under Optimal
Power Allocation,” IEEE ICCS, Nov. 2008.
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K.
L. Lam and T. M. Lok, “Framework for
Multiplexing Cooperative Routes in Multi-source Wireless Networks,
IEEE ICCS, Nov. 2008.
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W.
P. Tam, Xiaoting Zheng, and T. M. Lok, “Source-cooperated
Transmission Protocol in a Wireless Cluster,” IEEE ICCS, Nov.
2008.
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Cho Yiu Ng,
Tat Ming Lok, Tan F. Wong, “Pricing Game for Selfish Link
Cooperation,” IEEE ISIT, Jul. 2008.
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W.
P. Tam, T. M. Lok, and T. F. Wong, "Flow-optimized Asynchronous
Relay Selection Protocol for Parallel Relay Networks," in
Proceedings of the IEEE International Conference on Communications
(ICC '08), Beijing, China, May 2008.
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Wengang Mi and Tat M. Lok, “Power Control
in Decode-and-Forward Cooperative Systems,”
2008 Fifth International Conference on Wireless and Optical
Communications Networks (WOCN), Surabaya, Indonesia, May 2008.
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Xiaoting Zheng, Tat M. Lok, “Sum Power Minimization in
Access Point Selection with
Superposition Coding Scheme,” 2008 Fifth International
Conference on Wireless and Optical Communications Networks (WOCN), Surabaya, Indonesia, May 2008.
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Yi Huang, Fan
Hu, and Tat M. Lok, “Queue-Square Minimization with Adaptive
Resource Allocation in Multicarrier
CDMA Systems,” 2008 Fifth International Conference on Wireless
and Optical Communications Networks (WOCN), Surabaya, Indonesia, May 2008.
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D. Chatterjee, T. F. Wong, and T. M. Lok,
"Cooperative transmission in a wireless cluster based on flow
management," in Proceedings of the IEEE Wireless Communications
and Networking Conference (WCNC '08), Les Vegas, NV, Mar. 2008.
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Y. Huang and
T. M. Lok, “Channel Assignment and Time
Sharing for Multiple Access in Multicarrier Communication Systems,” IEEE Trans. on Vehicular Technol.,
Jul. 2007.
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Jing-Ru Zhang, Jun Zhang, T. M. Lok, Michael R. Lyu, “A
hybrid particle swarm optimization–back-propagation algorithm for
feedforward neural network training,” Applied Mathematics and Computation, Feb. 2007.
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H.
Y. Kwan and T. M. Lok “Binary-Code-Allocation
Scheme in DS-CDMA Systems,” IEEE
Trans. on Vehicular Technol., vol. 56, no. 1, Jan. 2007.
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Jun Zhang, De-Shuang Huang, T. M. Lok, and Michael R. Lyu, “A Novel Adaptive Sequential Niche
Technique for Multimodal Function Optimization,” Neurocomputing, Oct. 2006.
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T. F. Wong, T. M. Lok
and J. M. Shea, “Half-duplex Cooperative Transmission for the
Relay Channel with Flow Optimization,” 41st Annual Conference
on Information Sciences and Systems (CISS), Mar. 14-16, Baltimore, USA.
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M. H. Cheung and T. M.
Lok. “Cooperative
Routing in UWB Wireless Networks,”
IEEE WCNC 2007, Mar. 11-15, 2007,
Hong Kong.
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M. H. Cheung and T. M.
Lok, “Interference-Aware Routing in UWB Wireless
Networks,” IEEE Tencon 2006, No.
14-17, 2006, Hong Kong.
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Zhi-Kai Huang, De-Shuang
Huang, Michael R. Lyu, T. M. Lok, “Classification
Based on Gabor Filter Using RBPNN Classification,” 2006
International Conference on Computational Intelligence and Security
(CIS’2006) November 3-6, 2006,
Guangzhou, China.
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Sheng-Bo Guo, Michael R. Lyu, and T. M. Lok,
“Gene Selection Based
on Mutual Information for the Classification of Multi-class
Cancer,” International
Conference on Intelligent Computing (ICIC 2006), August 16–19, 2006, Kunming, Yunnan
Province, China. LNBI 4115, pp. 454
– 463, 2006.
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Guo-Jun Zhang, Ji-Xiang
Du, De-Shuang Huang, T. M. Lok, and Michael R. Lyu, “Adaptive Nearest Neighbor Classifier
Based on Supervised Ellipsoid Clustering,” 2nd International Conference on Natural Computation
(ICNC'06), Xi'an, China, Sep. 24-28, 2006. LNAI 4223, pp. 582 –
585, 2006.
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Zhong-hua Quan, De-shuang Huang, Xiao-lei Xia,
Michael R. Lyu, and T. M. Lok, “Spectrum Analysis Based on
Windows with Variable Widths for Online Signature Verification,”
International Conference on Pattern
Recognition (ICPR) 2006, August 20-24, 2006, Hong Kong.
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Chun-Hou Zheng, Zhi-Kai Huang, Michael R. Lyu,
and T. M. Lok “Nonlinear
Blind Source Separation Using Hybrid Neural Networks, ”
ISNN 2006, LNCS 3971, pp. 1165 – 1170, 2006.
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Fei Han, T. M. Lok and M. R. Lyu, "A New
Learning Algorithm for Function Approximation Incorporating A
Priori Information into Extreme Learning Machine", LNCS
3971, Advances in Neural Networks - ISNN 2006: Third International
Symposium on Neural Networks, ISNN 2006, Chengdu, China, May 28 -
June 1, 2006, Proceedings, Part I.
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Jun Zhang, T. M. Lok, “Multiple-Source
Multiple-Relay Cooperation System,” IEEE ICC 2006, Jun. 11-15,
2006, Istanbul, Turkey.
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Jun Zhang, T. M. Lok,
“Performance Comparison of Conventional and Cooperative
Multihop Transmission,” IEEE WCNC 2006, Apr. 3-6, 2006, Las
Vegas, USA.
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Jing-Jing Li, De-Shuang Huang, T. M. Lok, Michael
R. Lyu, Yi-Xue Li and Yun-Ping Zhu, “Network analysis of the
protein chain tertiary structures of
heterocomplexes,” Protein
and Peptide Letters, pp. 391-396, 2006.
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Fei Han,
Xu-Qin Li, M. R. Lyu, and T. M. Lok, “A Modified Learning Algorithm Incorporating
Additional Functional Constraints into Neural Networks,” International Journal of
Pattern Recognition and Artificial Intelligence Vol. 20, No. 2 (2006) 129–142.
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Chun-Hou
Zheng, De-Shuang Huang, Zhan-Li Sun, Michael R. Lyu, and
T. M. Lok, "Nonnegative Independent Component Analysis Based on
Minimizing Mutual Information Technique," pp. 878-883, Neurocomputing, March 2006.
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Bing Wang, De-Shuang Huang, Peng Chen, Jing-jing Li, T. M. Lok, Michael
R. Lyu, “Predicting Protein Interaction Sites from Residue
Spatial Sequence Profile and Evolution Rate” FEBS Letters, Volume 580,
Issue 2, Pages 380-384 (23 January 2006).
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Li Shang, De-Shuang Huang, T. M. Lok and Michael
R. Lyu, “A novel shrinkage technique based on the normal
inverse Gaussian density model,” Transactions of the Institute of Measurement and Control,
Volume 28, Number 1, January 2006, pp. 109-119(11).
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Ho Ting CHENG and T. M. LOK, “Detection Schemes for
Distributed Space-Time Block Coding in Time-Varying Wireless
Cooperative Systems,” IEEE Tencon 2005, Nov. 21-24, 2005, Melbourne, Australia.
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Jun Zhang, T. M. Lok, “Performance Analysis of
Multiple-Relay Decode-and-Forward Cooperation System,” IEEE
Tencon 2005, Nov. 21-24, 2005, Melbourne, Australia.
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Kin-Kwong Leung, Chi-Wan Sung, T. M. Lok and Vijay K. Bhargava, “An Optimal Phase Control Algorithm for MISO System with Finite
Feedback,” IEEE ISIT 2005, Sep. 4-9, 2005, Adelaide, Australia.
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X.-J. He,
D.-S. Huang, Y. Zhang, T. M. Lok, and M. R. Lyu, "A New Feature
of Uniformity of Image Texture Directions Coinciding with the Human
Eyes Perception," The First International Conference on
Natural Computation (ICNC 2005), Changsha, China, August 27-29
2005. LNAI 3614, pp. 727 – 730, 2005.
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X.-Q. Li, D.-S.
Huang, T. M. Lok, M. R. Lyu, and G.-B. Huang, "Improvements to
Conventional Layer-by-Layer BP Algorithm," International
Conference on Intelligent Computing (ICIC 2005), Hefei, China,
August 23-26 2005. LNCS 3645, pp. 189 – 198, 2005.
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X.-L. Xia,
D.-S. Huang, M. R. Lyu, T. M. Lok, and G.-B. Huang, "Methods of
Decreasing the Number of Support Vectors via k-Mean Clustering,"
International Conference on Intelligent Computing (ICIC 2005),
Hefei, China, August 23-26 2005. LNCS 3644, pp. 717 –
726, 2005.
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J. H. Han, D.
S. Huang, T. M. Lok, and R. Lyu, “A Novel Image Retrieval System
Based on BP Neural Network,” 2005 International Joint
Conference on Neural Networks (IJCNN), Montreal, Quebec, Canada, July
31-August 4, 2005.
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C.
Y. Ng, H. M. Tse, and T. M. Lok, “A goal programming model and
schemes for channel assignment in general downlink transmission
system,” IEEE ICC 2005, Seoul.
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H.
T. Cheng, H. Mheidat, M. Uysal, and T. M. Lok, “Distributed
space-time coding with imperfect channel estimation,” IEEE ICC
2005, Seoul.
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K. K. Leung,
H. Y. Kwan, T. M. Lok, and C. W. Sung, “Distributed sequence
adaptation for CDMA systems with antenna arrays,” IEE
Proceedings-Commun., Jun. 2005.
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Y. Huang, and
T. M. Lok, “Data rate guaranteed CTDMA for multicarrier
communication systems,” VTC 2004 Fall, Sep. 26-29, 2004, Los
Angeles, USA.
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F. Hu, H. M.
Tse, and T. M. Lok, “Minimization of transmission time for
multicarrier CDMA data networks,” VTC 2004 Fall, Sep. 26-29,
2004, Los Angeles, USA.
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C. Y. Ng and
T. M. Lok, “A goal programming approach for downlink channel
assignment,” VTC 2004 Fall, Sep. 26-29, 2004, Los Angeles, USA.
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K. K. Leung,
C. W. Sung, W. S. Wong, and T. M. Lok, “Convergence theorem for
a general class of power control algorithms,” IEEE Trans.
Commun., Sep. 2004.
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F. Zhao, and
T. M. Lok, “Efficient coding schemes for a multicode CDMA
system with constant amplitude transmission,” VTC 04 Spring,
May 17-19, 2004, Milan, Italy.
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T. M. Lok,
“Optimal uplink sequence assignment for multicarrier CDMA
systems in Rayleigh fading channels,” Fourth International
Conference on Information, Communications & Signal
Processing, Fourth IEEE Pacific-Rim Conference on Multimedia
(ICICS-PCM), 15-18 December 2003, Singapore.
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K. K. Leung,
T. M. Lok, and C. W. Sung, “Sequence adaptation for antenna
array systems,” 2003 International Symposium on Intelligent
Signal Processing and Communication Systems (ISPACS 2003), Awaji
Yumebutai International Conference Center,
Awaji Island, Japan, December 7- 10, 2003.
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T. M. Lok,
“Transmission algorithm for time division duplex systems with adaptive
antenna arrays,” 2003 International Symposium on Intelligent
Signal Processing and Communication Systems (ISPACS 2003), Awaji
Yumebutai International Conference Center,
Awaji Island, Japan, December 7- 10, 2003.
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Y. Huang and
T. M. Lok, “Optimal code assignment for multicarrier CDMA
systems with quantized feedback,” 8th International Conference
on Cellular and Intelligent Communications (CIC), Seoul, Korea, Oct.
28 – 31, 2003.
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T. M. Lok,
“Downlink code assignment for throughput or latency
optimization in multicarrier CDMA systems,” 14th IEEE
International Symposium on Persaonl, Indoor and Moblie Radio
Communications (PIMRC 03), Beijing, China, Sep. 7 – 10, 2003.
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K. K. Leung,
T. M. Lok, and C. W. Sung, “Sequence adaptation for cellular
systems,” VTC 2003 Spring, Jeju, Korea, Apr. 22-25, 2003.
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H. Y. Kwan and
T. M. Lok, “Sequence selection scheme for DS-CDMA systems,”
VTC 2003 Spring, Jeju, Korea, Apr. 22-25, 2003.
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T. M. Lok,
“Performance of an adaptive multicarrier CDMA system,”
ICCS 2002, Singapore, Nov. 25-28, 2002.
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K. K. Leung,
C. W. Sung, and T. M. Lok, “A class-based power control
algorithm for CDMA systems,” Wireless and Optical
Communications (WOC 2002), Banff, Alberta, Canada, Jul. 17-19, 2002.
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T. M. Lok,
“A time division duplex multicarrier CDMA system,” ICT
2002, Beijing, China, Jun. 23-26, 2002.
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T. M. Lok,
“Performance of DS/CDMA systems with intracell code
handoff,” ICT 2002, Beijing, China, Jun. 23-26, 2002.
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T. M. Lok and
H. Y. Kwan, “Simple signature sequence adaptation via gain
control,” 3G Wireless 2002, pp. 620-624, San Francisco, May
28-31, 2002.
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H. Y. Kwan and
T. M. Lok, “A time division duplex system with antenna arrays
for both the uplink and the downlink,” 3G Wireless 2002, pp.
463-468, San Francisco, May 28-31, 2002.
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T. M. Lok,
“Transmitter adaptation for CDMA systems via power control and
code diversity,” IEEE MILCOM 2001, Washington, D.C., Oct.
28-31, 2001.
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K. K. Leung,
C. W. Sung, W. S. Wong, and T. M. Lok, “Convergence theorem for
a general class of power control algorithms,” Proc. ICC 01,
Helsinki, Finland, Jun. 11-14, 2001.
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J. B. Moore,
J. S. Thorne, and T. M. Lok, “An optimization on a manifold
approach for solving an antenna array problem,” International
Workshop on Control, Optimization, Signal Processing and Computer
Communications, Hong Kong, May 5-6, 2001.
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J.B. Moore,
J.S. Thorne, and T.M. Lok, "An optimization on a manifold approach
for solving an antenna array problem," Communications in
Information and Systems, vol. 1, no. 2, pp. 163-180, Apr. 2001.
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T. F. Wong
& T. M. Lok, "Transmitter adaptation for multicode DS-CDMA
systems," IEEE Journal on Selected Areas in Commun., vol. 19,
pp. 69-82, Jan. 2001.
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T. F. Wong, L.
Gao, and T. M. Lok, “A type-I hybrid ARQ protocol over
optimal-sequence CDMA link,” Proc. Milcom2000, Los Angeles, CA,
Oct. 18-20, 2000.
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T.F. Wong and
T. M. Lok, "Doubly spread DS-CDMA for efficient blind
interference cancellation," IEE Proceeding – Commun., vol.
147, no. 5, pp. 299- 304, Oct. 2000.
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T. M. Lok and
T. F. Wong, “High capacity fixed wireless access systems with
antenna arrays,” Proc. WCNC2000, Chicago, IL, Sep. 23-28, 2000.
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H. Y. Kwan and
T. M. Lok, “Power control scheme with signature sequence
adaptation for DS-CDMA systems,” Proc. WCNC2000, Chicago, IL,
Sep. 23-28, 2000.
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T. M. Lok and
T.F. Wong, "Transmitter and receiver optimization in
multicarrier CDMA systems," IEEE Trans. Commun., vol. COM-48,
pp. 1197-1207, Jul. 2000.
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T. F. Wong and
T. M. Lok, “Spreading sequence adaptation in multicode CDMA
systems,” Proc. ICC’2000, New Orleans, LA, Jun. 18-22,
2000.
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H. Y. Kwan and
T. M. Lok, “Decentralized transmitter adaptation for
asynchronous DS-CDMA systems,” Proc. ICT’00, Acapulco,
Mexico, May 22-25, 2000.
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T. F. Wong and
T. M. Lok, “Doubly spread DS-CDMA for efficient interference cancellation,”
Proc. Milcom 99, Atlantic City, NJ, Oct. 31 - Nov. 3, 1999.
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T. M. Lok and
T. F. Wong, “Transmitter and receiver optimization in MC-CDMA
systems,” Proc. WCNC’99, New Orleans, LA, Sep. 21-24,
1999.
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Y. Lee and T.
M. Lok, “A decentralized adaptive transmission scheme for
MC-CDMA systems,” Proc. ICT’99, Cheju, Korea, Jun. 15-18,
1999.
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T. M. Lok,
T.F. Wong, and J.S. Lehnert, "Blind adaptive signal reception
for MCCDMA systems in Rayleigh fading channels," IEEE Trans.
Commun., vol. COM-47, pp. 464-471, Mar 1999.
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T.F. Wong, T.
M. Lok and J.S. Lehnert, "Asynchronous multiple access interference
suppression and chip waveform selection with aperiodic random
sequences," IEEE Trans. Commun., vol. COM-47, pp.103- 114, Jan.
1999.
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T. M. Lok, T.
F. Wong, and J. S. Lehnert, “Blind adaptive signal reception
for MC-CDMA systems with interference suppression,” Proc.
Milcom 98, Bedford, MA, Oct. 18-21, 1998.
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T. M. Lok, and
V. K. W. Wei, “Channel estimation with quantized
observations,” Proc. ISIT 98, MIT, Cambridge, MA, Aug. 16-21,
1998.
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F. S. L. Hui,
and T. M. Lok, “Novel spreading scheme for DS/CDMA systems with
blind interference suppression,” Proc. Wireless 98, Calgary,
Alberta, Canada, Jul. 6-8, 1998.
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T. F. Wong, T.
M. Lok, J. S. Lehnert, and M. D. Zoltowski, “A linear receiver
for direct-sequence spread-spectrum multiple-access systems with
antenna arrays and blind adaptation,” IEEE Trans. Inform.
Theory, vol. IT-44, pp. 659-676, Mar. 1998.
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T. M. Lok and
J. S. Lehnert, “An asymptotic analysis of DS/SSMA communication
systems with general linear modulation and error control
coding,” IEEE Trans. Inform. Theory, vol. IT-44, pp. 870-881,
Mar. 1998.
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T. F. Wong, J.
S. Lehnert, and T. M. Lok, “Chip waveform selection in
asynchronous DS-CDMA systems with interference suppression,” Proc.
ICUPC 97, vol. 1, pp. 208-212, San Diego, CA, Oct. 12-16, 1997.
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T. F. Wong, T.
M. Lok, J. S. Lehnert, and M. D. Zoltowski, “Spread spectrum signaling
techniques with antenna arrays and blind adaptation,” Proc.
MILCOM 96, vol. 1, pp. 194-198, Oct. 21-24, 1996.
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T. F. Wong, T.
M. Lok, and J. S. Lehnert, “Performance evaluation of a blind
adaptive linear receiver for cellular DS/CDMA systems,” Proc.
34th Annu. Allerton Conf. on Commun., Control, and Computing,
Allerton House, Monticello, IL, Oct. 2-4, 1996.
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T. M. Lok and
J. S. Lehnert, “Error probabilities for generalized quadriphase
DS/SSMA communication systems with random signature sequences,”
IEEE Trans. Commun., vol. COM-44, pp. 876-885, Jul. 1996.
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T. M. Lok and
J. S. Lehnert, “Efficient approximations in DS/SSMA
communication systems with general linear modulation and error
control coding,” Proc. 1996 Tactical Commun. Conf., Fort Wayne,
IN, Apr. 30-May 2, 1996.
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T. M. Lok and
J. S. Lehnert, “An asymptotic analysis of DS/SSMA communication
systems with random polyphase signature sequences,” IEEE Trans.
Inform. Theory, vol. IT-42, pp.129-136, Jan. 1996.
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T. M. Lok and
J. S. Lehnert, “Limits on performance with random polyphase
sequences in DS/SSMA systems,” Proc. 33rd Annu. Allerton Conf.
on Commun., Control, and Computing, Allerton House, Monticello, IL,
Oct. 4-6, 1995.
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T. M. Lok and
J. S. Lehnert, “DS/SSMA communication system with trellis
coding and CPM,” IEEE Journal on Selected Areas in Commun.,
vol. 12, pp. 716-722, May 1994.
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T. M. Lok and
J. S. Lehnert, “DS/SSMA communication system with trellis
coding and CPM,” Proc. 28th Annu. Conf. Inform. Sci. Syst.,
Princeton Univ., Princeton, NJ, Mar. 16-18, 1994, pp. 295-300.
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