# Faculty

## Prof. Wong Wing Shing 黃永成教授

**Choh-Ming Li Professor of Information Engineering **(FIEEE, FHKIE, FHKAES)

## Recent Projects

- "Learning in Information-based Pursuit-Evasion Games," GRF
- "Control of Adaptive Formations," GRF
- "A Communication Network Architecture with Virtual Circuit Switching and Deflection Routing for QoS Guarantees," GRF
- "Distributed Cooperative Control Systems Allowing Choices," 具选择功能的分布式合作控制系统, NSFC
- "Time Critical Applications over a Shared Network," SHIAE
- "Control under Finite Communication Bandwidth," CERG
- "Protocol Sequences based on the Chinese Remainder Theorem and Their Application to Communication Systems," CERG
- "Communication Complexity of Digital Finite Communication Bandwidth Control Systems," CERG
- "Random Access Protocol without Feedback for Sensor Network," CERG

- "Information Coding in Decision and Control Systems," CERG

- "Code Allocation in Multi-Rate Spread Spectrum Wireless Systems," CERG
- "Control of Time Critical Networks," from Huawei Technologies Co. Ltd.

## Representative Publications

**Information-Based Control**- W. S. Wong and R. W. Brockett, "Systems with Finite Communication Bandwidth Constraints I: State Estimation Problems",
*IEEE Transactions on Automatic Control*, 42(9) (1997) 1294-1298. - X. Li and W. S. Wong, "State Estimation with Communication Constraint,"
*Systems and Control Letters*28 (1996) 49-54. . - W. S. Wong and R. W. Brockett, "Systems with Finite Communication Bandwidth Constraints II: Stabilization with Limited Information Feedback",
*IEEE Transactions on Automatic Control*, 44(5) (1999) 1049-1053. - Wong, W. S. and C. W. Sung, "Robust Convergence of Low-Data Rate-Distributed Controllers,"
*IEEE Transactions on Automatic Control*, 49(1), (Jan 2004) 82 – 87. - W. S. Wong and H. Cheng, "Invariant Distributions of Linear Systems Under Finite Communication Bandwidth Feedback,"
*Proceedings of the IEEE 2007 Conference on Decision and Control*, New Orleans, 12-14 December 2007, 2247-2252. - W. S. Wong, "Control Communication Complexity of Distributed Control Systems",
*SIAM**J. Control Optim.*, 48(3) 1722-1742 (May 2009). - W. S. Wong and J. Baillieul, "Control Communication Complexity of Nonlinear Systems,"
*Communications in Information and Systems*, 9(1), (2009), 103-140. - W. S. Wong and H. Cheng, "Control and dynamics of linear systems under finite quantised feedback", Int. J. Systems, Control and Communications, Vol. 3, No. 4, 2011.
- J. Baillieul and W. S. Wong, "The Standard Part Problem and the Complexity of Control Communication," Proceedings of the IEEE 2009 Conference on Decision and Control, Shanghai.
- H. Cheng, Y.-S. Chen, W. S. Wong, Q. Yang, L.-F. Shen and J. Baillieul, "Stabilizing an Tracking Control of Multiple Pendulum-Cart Systems over a Shared Wireless Network,"
*Proceedings of the Chinese Control Conference*, July 25-27, 2012 in Hefei, AnHui, China. - Wong, W. S. and J. Baillieul, "Control Communication Complexity of Distributed Actions,"
*IEEE Transactions on Automatic Control,*Vol 57, No. 11 (Nov 2012), pp. 2731-2745. - H. Cheng, Y. Chen, W. S. Wong, Q. Yang and L. F. Shen, "Protocol Sequence Based Wireless Media Access Control in Networked Control Systems," to appear in 12th International Conference on Control, Automation, Robotics and Vision (ICARCV) December 5-7, 2012 in Guangzhou, China.
- W. S. Wong, "Networks of Open Interaction," in the Proceedings of the 32nd Chinese Control Conference 2013, Xi'an, China.
- Z. Liu, W. S. Wong and G. Guo, "Cooperative Control of Linear Systems with Choice Actions," in ACC 2013, Washington D. C.2013.
- Z. Liu and W. S. Wong, "Choice-Based Cluster Consensus in Multi-Agent Systems," in CCC 2013, Xi'an, 2013.
- Z. Liu and W. S. Wong, “Control and Signaling in Distributed Linear Control Systems Allowing Choices,”
*Proceedings of the 2014 American Control Conference*, June 4-6, 2014, Portland, USA, 5724-5729. - H. Cheng and W. S. Wong, "Application of Protocol Sequences in Wireless Networked Control Systems", Proc. of the 33rd Chinese Control Conference, pp. 5666-5671, Nanjing, China, July 28-30, 2014.
- H. Cheng, Y. Chen and W. S. Wong, "Trajectory Tracking and Formation Flight of Autonomous UAVs in GPS-Denied Environments Using Onboard Sensing", Proc. of the IEEE Chinese Guidance, Navigation and Control Conference, Yantai, China, Aug. 8-10, 201
- Z. Liu and W. S. Wong, “Distributed control of linear systems allowing choices,”
*SIAM J. Control Optimization*, Vol 53, No. 2, pp. 670-689, March 2015. - W. S. Wong and J. Baillieul, “Information-Based Multi-agent Systems,” Encyclopedia of Systems and Control, Springer-Verlag, London, 2015, DOI 10.1007/978-1-4471-5102-9_153-1
- S. Wen, G. Guo, W. S. Wong, "Hybrid event-time-triggered networked control systems: scheduling-event-control co-design," Information Sciences. Vol. 305: 269-284, 2015. June 1, 2015. http://www.sciencedirect.com/science/article/pii/S0020025515000511
- G. Guo, Z. Liu, and W. S. Wong, "Coordinated Optimal Target Realization for Linear Systems Allowing Choice-Based Actions,"
*Optimal Control Applications and Methods*, vol 37(5): 1074-1084, Sept/Oct 2016. Published online on 7 Dec 2015. DOI: 10.1002/oca.2225 - Z. Liu and W. S. Wong, "Output Cluster Synchronization of Heterogeneous Linear Multi-agent Systems,"
*Proceedings of the IEEE 2015 Conference on Decision and Control*, Osaka December 15-18, 2015. - Z. Liu, W. S. Wong and H. Cheng, "Cluster synchronization of coupled linear systems under directed nonnegative graphs," Proceedings of 35th Chinese Control Conference, Chengdu, China, Jul. 27-29, 2016.

- W. S. Wong and R. W. Brockett, "Systems with Finite Communication Bandwidth Constraints I: State Estimation Problems",
**Protocol Sequence**- W. S. Wong, "New Protocol Sequences for Random Access Channels without Feedback,"
*IEEE Transactions on Information Theory*, 53(6), (June 2007), pp. 2060-2071. - Zhang, Y. J., K. W. Shum, and W. S. Wong, "On Pairwise Shift-Invariant Protocol Sequences," IEEE Communication Letters, vol.13(6) (June 2009), pp. 453-455.
- C. S. Chen, K. W. Shum, C. W. Sung, W. S. Wong,and G. E. Øjen, "User Unsuppressible Protocol Sequences for Collision Channel without Feedback," ISITA 2008, Auckland, 2008.
- K. W. Shum, W. S. Wong, C. W. Sung, and C. S. Chen, "Design and Construction of Protocol Sequences: Shift Invariance and User Irrepressibility," ISIT 2009, Seoul, June 28 2009-July 3, pp. 1368-1372, 2009.
- Chen, C. S., W. S. Wong, and Y.-Q. Song, "Constructions of Robust Protocol Sequences for Wireless Sensor and Ad-hoc Networks," IEEE Transactions on Vehicular Technology, vol. 57(5), pp. 3053-3063, 2008.
- K. W. Shum, C. S. Chen, C. W. Sung, and W. S. Wong, "Shift-Invariant Protocol Sequences for Collision Channels without Feedback,"
*IEEE Transactions on Information Theory,*vol 55(7), pp. 3312-3322 , (July 2009)*.* - K W. Shum and W. S. Wong, "A Tight Asymptotic Bound on the Size of Constant-Weight

Conflict-Avoiding Codes," Journal of Designs, Codes and Cryptography, vol 57(1) 1-14, Oct 2010*(appeared online Nov 2009)*DOI: 10.1007/s10623-009-9345-4. - K. W. Shum, W. S. Wong, and C. S. Chen, "A General Upper Bound on the Size of

Constant-Weight Conflict-Avoiding Codes,"*IEEE Transactions on Information Theory,*vol 56(7), pp. 3265-3276, (July 2010)*.* - K. W. Shum and W. S. Wong, "Construction Short Protocol Sequences with Worst-Case Throughput Guarantee,"
*Proceedings of International Symposium on Information Theory, ISIT 2010*, Austin, USA, June 13-18, 2010, pp. 1828-1832 . - K. W. Shum, Y. Zhang, and W. S. Wong, "User-Irrepressible Sequences," Proceedings of the SETA 2010, Paris, Sept 13-17. 2010, pp. 88-101 (LNCS 6338, Springer.)
- K. W. Shum and W. S. Wong, "Construction and Applications of CRT Sequences,"
*IEEE Transactions on Information Theory*, vol 56(11), 5780-5795*.*(Version with minor typos corrected) - Y. Zhang, K. W. Shum and, W. S. Wong, "User-Detectable Sequences for the Collision Channel Without Feedback," Proceedings of the 7th International Symposium on Wireless Communication Systems, York, UK, Sept 19-22, 2010.
- Y. Zhang, K. W. Shum and W. S. Wong, "Strongly conflict-avoiding codes," SIAM J. on Discrete Math, 25(3), (July 2011), pp. 1035-1053.
- Y. Zhang, K. W. Shum and, W. S. Wong, "Completely Irrepressible Sequences for the Asynchronous Collision Channel Without Feedback,"
*IEEE Transactions on Vehicular Technology*60(5) (May 2011)*pp. 1859-1866.* - Y. Zhang and W. S. Wong, “Distributed Load Balancing in a Multiple Server System by Shift-Invariant Protocol Sequences,”
*Proceedings of the Wireless Communications and Networking Conference,*April 7-10 2013, Shanghai, China, 1639-1644. - W. S. Wong, "Transmission Sequence Design and Allocation for Wide Area Ad Hoc Network" to appear ," ," IEEE Transactions on Vehicular Technology, Vol 63, No. 2, (Feb 2014) pp. 869-878
*.* - Y. Wu, K. W. Shum, W. S. Wong, Q. Su, and L.-F. Shen, “Safety-Message Broadcast in Vehicular Ad Hoc Networks Based on Protocol Sequences,” IEEE Transactions on Vehicular Technology, Vol 63, No. 3, (Mar 2014) pp. 1467-1479.
- Y. Zhang, K. W. Shum, W, S. Wong and F. Shu, “Binary Sequences for Multiple Access Collision Channel: Identification and Synchronization,”
*IEEE Transactions on Communications,*Vol. 62, No. 2 (Feb 2014) pp. 667-675. - Y. Zhang, Y.-H. Lo, F. Shu and W. S. Wong, “Protocol Sequences for Multiple-Packet Reception: Throughput Invariance and User Irrepressibility,”
*Proceedings of ISIT 2014*, Jun 29 – July 4, Honolulu, USA. - Y.-H. Lo, W. S. Wong and H.-L. Fu, “Partially user-irrepressible sequence sets and conflict-avoiding codes,”
*Designs, Codes and Cryptography*, Vol 78 (3), pp.679-691. - Y. Zhang, Y.-H. Lo and W. S. Wong, “Optimal strongly conflict-avoiding codes of even length and weight three,”
*Designs, Codes and Cryptography*, Vol.79 (2), pp. 367-382. - Y. Zhang, W. K. Shum, W. S. Wong and F. Shu, “An Energy-Aware Reliable Deterministic Broadcast Protocol for Wireless Sensor Networks,”
*Proceedings of IEEE Globecom Workshop,*Austin, USA, 1427-1432, Dec. 12, 2014. - Y. Zhang, Y.-H. Lo, W. S. Wong, and F. Shu, "Protocol Sequences for the Multiple-Packet Reception Channel without Feedback,"
*IEEE Transactions on Communications*, Vol. 62, no. 4, pp.1687-1698, Apr. 2016. - Y. Zhang, Y.-H. Lo and W. S. Wong, "Completely irrepressible sequences for multiple-packet reception",
*IEEE Trans. Vehicular Tech.*, vol. 65, no. 8, pp. 6803-6809, Aug. 2016. DOI: 10.1109/TVT.2015.2478895 - C.-C. Chen, G.-C. Yang, M.-K. Chang, J.-S. Lin, W. S. Wong, and W. C. Kwong, "Constructions and throughput analyses of protocol sequences with adjustable duty factor for collision channels without feedback,"
*IEEE Transactions on Communications*, Vol. 64, no. 11, pp.4736-4748, Nov. 2016. - Y. Chen, W. K. Shum and W. S. Wong, "Generalized CRT Sequence and Its Applications," in Sequences and Their Applications (SETA) Chengdu, China, Oct 9-14, 2016.
- Y. Zhang, Y. Chen, Y.-H. Lo and W. S. Wong, "The Zero-error Capacity of a Collision Channel with Successive Interference Cancellation," IEEE ISIT 2017, Aachen, June 25-30, 2017.

- W. S. Wong, "New Protocol Sequences for Random Access Channels without Feedback,"
**Power Control**- K. H. Lam and W. S. Wong, "Distributed Power Balancing with Limited Control Data Flow",
*IEEE Transactions on Vehicular Technology*, 46(1) (1997) pp. 247-252. - C. W. Sung and W. S. Wong, "A Distributed Fixed-Step Power Control Algorithm with Quantization and Active Link Quality Protection",
*IEEE Transactions on Vehicular Technology*, 48(2) (1999) pp. 553-562. - C. W. Sung and W. S. Wong, "The Convergence of an Asynchronous Cooperative Algorithm for Distributed Power Control in Cellular Systems",
*IEEE Transactions on Vehicular Technology*48(2) (1999) pp. 563-570. - C. W. Sung, K. K. Leung and W. S. Wong, "A Quality-Based Fixed-Step Power Control Algorithm with Adaptive Target Threshold",
*IEEE Transactions on Vehicular Technology*49(4) (2000) pp. 1430-1439*.* - C. W. Sung and W. S. Wong, "Performance of a Cooperative Algorithm for Power Control in Cellular Systems with a Time-varying Link Gain Matrix",
*Wireless Networks*6 (Dec 2000) pp. 429-441. - C. W. Sung and W. S. Wong, "Mathematical Aspects of the Power Control Problem in Mobile Communication Systems," in
*Lectures on Systems, Control, and Information: Lectures at the Morningside Center of Mathematics*. Le Guo and Stephen S.-T. Yau eds, ACM/International Press (2000). - C. W. Sung and W. S. Wong, "Power control and rate management for wireless multimedia CDMA systems,"
*IEEE Transactions on Communications*, 49(7), (July 2001) pp. 1215-1226. - C. W. Sung and W. S. Wong, "A Noncooperative Power Control Game for Multirate CDMA Data Networks,"
*IEEE Trans. on Wireless Communication,*vol. 2, no. 1, (Jan 2003) pp. 186-194. - K. K. Leung, C. W. Sung, W. S. Wong, and T. M. Lok, "Convergence Theorem for a General Class of Power Control Algorithms,"
*IEEE Transactions on Communications*, 52(9), (Sept 2004) pp. 1566-1574. - H. S. Zhang, C. S. Chen, and W. S. Wong, "Distributed Power Control for Time-Varying Systems: Performance and Convergence Analysis,"
*IEEE Transactions on Vehicular Technology*, 54(5), (Sept 2005), pp. 1896-1904. - H. S. Zhang, W. S. Wong, W. Ge, and P. E. Caines, "A Stochastic Approximation Approach to the Robust Power Control Problem,"
*IEEE Trans. on Communications*, 55(2), (May 2007), pp. 878-886. - Y. Chen and W. S. Wong, "Power Control for non-Gaussian Interference," 7th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, WiOPT 2009.
- W. S. Wong, " Concavity of the Feasible Signal-to-Noise Ratio Region in Power Control Problems ",
*IEEE Transactions on Information Theory,*57(4), (April 2011), pp. 2143-2150*.* - Y. Chen and W. S. Wong, "Power Control for non-Gaussian Interference," IEEE Transactions on Wireless Communications, 10(8), (AUg 2011) pp. 2660-2669.
- Y. Chen, S. Yang and W. S. Wong, "Exact non-Gaussian Interference Model for Fading Channels,"
*IEEE Transactions on Wireless Communications,*Vol. 12, No. 1 (Jan 2013), pp. 168-179. - Y. Chen, C. W. Sung, S.-W., Ho and W. S. Wong, "BER Analysis for Interfering Visible Light Communication Systems," Proceedings of 10th International Symposium on Communication Systems, Networks and Digital Signal Processing, Prague, Czech Republic, Jul 20-22, 2016.

- K. H. Lam and W. S. Wong, "Distributed Power Balancing with Limited Control Data Flow",
**Nonlinear Filtering**- W. S. Wong, "New Classes of Finite-Dimensional Nonlinear Filters,"
*Systems and Control Letters*3 (1983) 155-164. - W. E. Hopkins and W. S. Wong, "Lie-Trotter Product Formulas for Nonlinear Filtering," Stochastics 17 (1986) 313-337.
- W. S. Wong, "Theorem on the Structure of Finite Dimensional Estimation Algebras,"
*Systems and Control Letters*9 (1987) 117-124. - W. S. Wong, "On a New Class of Finite Dimensional Estimation Algebras,"
*Systems and Control Letters*(1987) 79-83. - L. Tam, W. S. Wong, and S. Yau, "A Necessary and Sufficient Condition for Finite Dimensional Estimation Algebras,"
*SIAM J. of Control and Optimization*, 28(1) (1990) 173-185. - R. Dong, L. Tam, W. S. Wong, S. S.-T. Yau, "Structure and Classification Theorems of Finite Dimensional Exact Estimation Algebras,"
*SIAM J. of Control and Optimization*, 29(4) (1991) 866-877. - W. S. Wong and S. S.-T. Yau, "The Estimation Algebra of Nonlinear Filtering Systems," in
*Mathematical Control Theory*, J. Baillieul and J. C. Willems eds, Springer Verlag, (1999), 33-65.

- W. S. Wong, "New Classes of Finite-Dimensional Nonlinear Filters,"
**Wireless Network/Communication Network**- C. W. Sung and W. S. Wong, "User Speed Estimation and Dynamic Channel Allocation in a Hierarchical Cellular System,"
*Proceedings of IEEE Vehicular Technology Conference*, June 8-10 1994, Stockholm, Sweden 91-95. - C. W. Sung and W. S. Wong, "Sequential Packing Algorithm for Channel Assignment under Co-channel and Adjacent Channel Interference Constraint,"
*IEEE Transactions on Vehicular Technology*, 46(3) (1997) 676-687. - W. H. Yuen and W. S. Wong, "A Contention Free Mobility Management Scheme Based on Probabilistic Paging,"
*IEEE Transactions on Vehicular Technology*, 50(1), (Jan 2001) 48-58. - C. S. Chen and W. S. Wong, "Bandwidth Allocation for Wireless Multimedia Systems with Most Regular Sequences,"
*IEEE Trans. on Wireless Communication*, 4(2), (March 2005), 635-645. - W. S. Wong and F. J. Li, "Fairness Index and Distributed Control in Communication Networks,"
*Communications in Information and Systems*, 6(2), (2006), 83-114. - Y. Zhang, Y.-H. Lo, S. Wang and W. S. Wong, "A Hybrid Wavelength Reservation Scheme for Large-Scale Optical Networks," Proceedings of the 25th Wireless and Optical Communication Conference (WOCC), pp. 1-5, May 21-23, 2016. DOI: 10.1109/WOCC.2016.7506544
- F. Liu, Y. Chen, and W. S. Wong, "An asynchronous load balancing scheme for multi-server systems," in 2016
*IEEE 7th Annual Ubiquitous Computing, Electronics Mobile Communication Conference (UEM- CON)*, Octn 20-22, 2016, pp. 1–7. - Y.-H. Lo, Y. Zhang, Y. Chen, H.-L. Fu, and W. S. Wong, "The Global Packing Number of a Fat-tree Network," to appear in
*IEEE Transactions on Information Theory*.

- C. W. Sung and W. S. Wong, "User Speed Estimation and Dynamic Channel Allocation in a Hierarchical Cellular System,"
**Computing/Optimization**- P. Bernstein, D. Shipman, W. S. Wong, "Formal Aspects of Serializability in Database Concurrency Control",
*IEEE Trans. Software Engineering*SE-5 (1979) 203-216. - R. J. T. Morris and W. S. Wong, "Performance Analysis of Locking and Optimistic Concurrency Control Algorithms,"
*Performance Evaluation*5 (1985) 105-118. - W. S. Wong and R. J. T. Morris, "Benchmark Synthesis Using the LRU Cache Hit Function,"
*IEEE Trans. on Computers*, 7(6) (1988) 637-645. - W. S. Wong and R. J. T. Morris, "A New Approach to Choosing Initial Points in a Local Search,"
*Information Processing Letters*, 30 (1988) 67-72. - R. J. T. Morris and W. S. Wong, "A Short Term Neural Network Memory,"
*SIAM Journal on Computing*,17(6) (1988) 1103-1118. - W. S. Wong and M. C. Chuah, "A Hybrid Approach to Address Normalization"
*IEEE Expert*(6) (1994) 38-45. - W. S. Wong, "Matrix Representation and Gradient Flows for NP-Hard Problems"
*in Journal of Optimization Theory and Applications*87(1) (1995) 197-220. - Li, Q. and W. S. Wong, "Optimal Estimator for Distributed Anonymous Observers",
*Journal of Optimization Theory and Applications*, 140(1), (Jan 2009), 55-75. - Wong, W. S. and C. W. Sung, "Robust Convergence of Low-Data Rate-Distributed Controllers,"
*IEEE Transactions on Automatic Control*, vol. 49, no. 1, (Jan 2004) 82 – 87.

- P. Bernstein, D. Shipman, W. S. Wong, "Formal Aspects of Serializability in Database Concurrency Control",
**Stochastic Systems**- W. S. Wong, "Carleman Transformation and Ovcyannikov-Treves Operators,"
*Nonlinear Analysis TMA*6(12) (1982) 1295-1308. - W. S. Wong, "Carleman Linearization and Moment Equations of Nonlinear Stochastic equations,"
*Stochastics*9 (1983) 77-101. - B. Doshi and W. S. Wong, "Exact Solution of a Simple Finite Infinite Source Interaction Model,"
*Qeueing Systems*2 (1987) 67-82. - J. Kaufman, B. Sengupta, W. S. Wong, "Performance Analysis of a Packet Assembly Function,"
*IEEE Trans. on Automatic Control*, 38(1) (1993) 109-113. - J. Kaufman and W. S. Wong, "Approximate Analysis of a Gordon-Newell Like Non-Product-Form Queueing Network,"
*Annals of Operations Research*48 (1994) 249-271

- W. S. Wong, "Carleman Transformation and Ovcyannikov-Treves Operators,"
**Plenary Talks**- Semi-plenary speaker at the 48
^{th}IEEE Control and Decision Conference, title: Target Choice, Control Energy, and Communication Complexity: Facets of an Information-Based Distributed Control System, Shanghai, 2009 - Plenary Speaker at WICOM titled Protocol Sequences and Their Application to Ad Hoc Networks,2010 Sept 23-25, 2010 Chengdu.
- Plenary speaker, July 26-28 2013, 32
^{nd}Chinese Control Conference, Xi’an - Plenary speaker at the 7th IEEE/International Conference on Advanced Infocomm Technology, Nov 14-16, 2014, Fujian Normal University, China, talk title, “Schedule Sequences and Their Applications in Communication Networks.”
- Invited speaker at the Workshop on Navigation and Control of MASs with Uncertain Information, Guangzhou, Dec 8-9, 2014, talk title, “Managing Uncertainties in Control Objectives via Communication.”
- Plenary speaker at the 6th IFAC Workshop on Distributed Estimation and Control in Networked Systems, Sept 9, 2016, talk title, "From control of networks to networked control".