List of Publications

Journal

[27] Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Lawrence Ong, Sarah J. Johnson, "Raptor Codes for Higher-Order Modulation Using a Multi-Edge Framework", accepted and to appear in IEEE Wireless Communications Letters. [DOI]

[26] Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Lawrence Ong, Sarah J. Johnson, "Analysis and design of Raptor codes using a multi-edge framework", accepted and to appear in IEEE Transactions on Communications. [pdf|DOI]

[25] Lawrence Ong, "Optimal Finite-Length and Asymptotic Index Codes for Five or Fewer Receivers", IEEE Transactions on Information Theory. Vol. 63, No. 11, pp. 7116-7130, Nov. 2017. [pdf|DOI]

[24] Chandra Thapa, Lawrence Ong, Sarah J. Johnson, "Interlinked Cycles for Index Coding: Generalizing Cycles and Cliques", IEEE Transactions on Information Theory, Vol. 63, No. 6, pp. 3692-3711, June 2017. [pdf|DOI]

[23] Behzad Asadi, Lawrence Ong, Sarah J. Johnson, "The DoF Region of the Three-Receiver Gaussian MIMO Broadcast Channel with Receiver Message Side Information", IEEE Transactions on Communications, Vol. 65, No. 5, pp. 2000-2010, May 2017.  [pdf|DOI]

[22] Behzad Asadi, Lawrence Ong, Sarah J. Johnson, "Leveraging Receiver Message Side Information in Two-Receiver Broadcast Channels: A General ApproachEntropy, Vol. 19, No. 4:138, 2017. [DOI]

[21] Sarah J. Johnson, Andrew M. Lance, Lawrence Ong, Mahyar Shirvanimoghaddam, T. C. Ralph, Thomas Symul, "On the problem of non-zero word error rates for fixed-rate error correction codes in continuous variable quantum key distribution", New Journal of Physics, Vol. 19, No. 2, pp. 023003, Feb. 2017. [DOI]

[20] Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Lawrence Ong, Sarah J. Johnson, "A Joint Optimization Technique for Multi-Edge Type LDPC Codes", IET Communications, Vol. 11, No. 1, pp. 61-68, Jan. 2017. [pdf|DOI]

[19] Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Lawrence Ong, Gottfried Lechner, Sarah J. Johnson, "A New Density Evolution Approximation for LDPC and Multi-Edge Type LDPC Codes", IEEE Transactions on Communications, Vol. 64, No. 10, pp. 4044-4056, Oct. 2016. [pdf|DOI]

[18] Lawrence Ong, Chin Keong Ho, Fabian Lim, "The Single-Uniprior Index-Coding Problem: The Single-Sender Case and The Multi-Sender Extension", IEEE Transactions on Information Theory, Vol. 62, No. 6, pp. 3165-3182, June 2016.  [pdf|DOI]

[17] Lawrence Ong, Roy Timo, "A Multiway Relay Channel with Balanced Sources", IEEE Transactions on Communications, Vol. 63, No. 12, pp. 4809-4823, Dec. 2015. [pdf|DOI]

[16] Behzad Asadi, Lawrence Ong, Sarah J. Johnson, "Optimal Coding Schemes for the Three-Receiver AWGN Broadcast Channel with Receiver Message Side Information", IEEE Transactions on Information Theory, Vol. 61, No. 10, pp. 5490-5503, Oct. 2015. [pdf|DOI]

[15] Behzad Asadi, Lawrence Ong, Sarah J. Johnson, "On Index Coding in Noisy Broadcast Channels with Receiver Message Side Information", IEEE Communications Letters, Vol. 18, No. 4, pp. 640-643, Apr. 2014. [pdf|DOI]

[14] Lawrence Ong, Sarah J. Johnson, Christopher M. Kellett, "On the Capacity of the Binary Symmetric Parallel-Relay Network", Transactions on Emerging Telecommunications Technologies (formerly known as European Transactions on Telecommunications), Vol. 25, No. 2, pp. 217-230, Feb. 2014. [pdf|DOI]

[13] Lawrence Ong, Gottfried Lechner, Sarah J. Johnson, Christopher M. Kellett, "The Three-User Finite-Field Multi-Way Relay Channel with Correlated Source", IEEE Transactions on Communications, Vol. 61, No. 8, pp. 3125-3135, Aug. 2013. [pdf|DOI]

[12] Roy Timo, Gottfried Lechner, Lawrence Ong, Sarah J. Johnson, "Multi-Way Relay Networks: Orthogonal Uplink, Source-Channel Separation and Code Design", IEEE Transactions on Communications, Vol. 61, No. 2, pp. 753-768, Feb. 2013. [pdf|DOI]

[11] Lawrence Ong, Sarah J. Johnson, Christopher M. Kellett, "The Half-Duplex AWGN Single-Relay Channel: Full Decoding or Partial Decoding?", IEEE Transactions on Communications, Vol. 60, No. 11, pp. 3156-3160, Nov. 2012. [pdf|DOI]

[10] Lawrence Ong, Christopher M. Kellett, Sarah J. Johnson, "On The Equal-Rate Capacity of the AWGN Multiway Relay Channel", IEEE Transactions on Information Theory, Vol. 58, No. 9, pp. 5761-5769, Sept. 2012. [pdf|DOI]

[9] Lawrence Ong, Mehul Motani, Sarah J. Johnson, "On Capacity and Optimal Scheduling for the Half-Duplex Multiple-Relay Channel", IEEE Transactions on Information Theory, Vol. 58, No. 9, pp. 5770-5784, Sept. 2012. [pdf|DOI]

[8] Lawrence Ong, Sarah J. Johnson, "The Capacity Region of the Restricted Two-Way Relay Channel with Any Deterministic Uplink", IEEE Communications Letters, Vol. 16, No. 3, pp. 396-399, Mar. 2012. [pdf|DOI]

[7] Sarah J. Johnson, Lawrence Ong, Christopher M. Kellett, "Joint Channel-Network Coding Strategies for Networks with Low Complexity Relays", European Transactions on Telecommunications, Vol. 22, No. 7, pp. 396–406, Nov. 2011. [pdf|DOI]

[6] Lawrence Ong, Sarah J. Johnson, Christopher M. Kellett, "The Capacity Region of Multiway Relay Channels Over Finite Fields with Full Data Exchange", IEEE Transactions on Information Theory (Special Issue on Interference Networks), Vol. 57, No. 5, pp. 3016–3031 May 2011. [pdf|DOI]

[5] Lawrence Ong, Mehul Motani, "Optimal Routing for Decode-Forward in Cooperative Wireless Networks", IEEE Transactions on Communications, Vol. 58, No. 8, pp. 2345–2355, Aug. 2010. [pdf|DOI]

[4] Lawrence Ong, Sarah J. Johnson, Christopher M. Kellett, "An Optimal Coding Strategy for the Binary Multi-Way Relay Channel", IEEE Communications Letters, Vol. 14, No. 4, pp. 330–332, Apr. 2010. [pdf|DOI]

[3] Lawrence Ong, Mehul Motani, "Myopic Coding in Multiterminal Networks", IEEE Transactions on Information Theory, Vol. 54, No. 7, pp. 3295–3314, July 2008. [pdf|DOI]

[2] Lawrence Ong, Mehul Motani, "Coding Strategies for Multiple-Access Channels with Feedback and Correlated Sources", IEEE Transactions on Information Theory (Special Issue on Models, Theory & Codes for Relaying & Cooperation in Communication Networks), Vol. 53, No. 10, pp. 3476–3497, Oct. 2007. [pdf|DOI]

[1] Lawrence Ong, Mehul Motani, "On the Capacity of the Single Source Multiple Relay Single Destination Mesh Network", Ad Hoc Networks (Special Issue on Wireless Mesh Networks), Vol. 5, No. 6, pp. 786–800, Aug. 2007. [pdf|DOI]


Conference

[44] Haoshuai Ding, Lawrence Ong, "An Improved Caching Scheme for Nonuniform Demands and Its Optimal Allocation", accepted and to be presented at the 2017 IEEE International Conference on Computer and Communications (ICCC), Chengdu, China, Dec. 13-16, 2017.

[43] Tung T. Vu, Duy T. Ngo, Lawrence Ong, Salman Durrani, Richard H. Middleton,"Joint Optimization of User Association, Data Delivery Rate and Precoding for Cache-Enabled F-RANs", accepted and to be presented at the 2017 IEEE Global Communications Conference (Globecom 2017), Singapore, December 4-8, 2017. [pdf]

[42] Min Li, Lawrence Ong, Sarah J. Johnson, "Improved Bounds for Multi-Sender Index Coding", Proceedings of the 2017 IEEE International Symposium on Information Theory (ISIT 2017), Aachen, Germany, June 25-30, 2017. [pdf]

[41] Lawrence Ong, Badri N. Vellambi, Jörg Kliewer, Phee Lep Yeoh, "An equivalence between secure network and index coding"Proceedings of the 2016 IEEE Global Communications Conference (Globecom 2016) Workshop on Network Coding and Applications (NetCod),  Washington, USA, Dec. 4-8, 2016. [pdf|DOI]

[40] Chandra Thapa, Lawrence Ong, Sarah J. Johnson, "Graph-Theoretic Approaches to Two-Sender Index Coding", Proceedings of the 2016 IEEE Global Communications Conference (Globecom 2016) Workshop on Network Coding and Applications (NetCod),  Washington, USA, Dec. 4-8, 2016. [pdf|DOI]

[39] Zhicheng He, Junchu Kao, Lawrence Ong, "NOMA's Offline Power Allocation and Corresponding Algorithms: A Design and its Evaluation"Proceedings of the 2016 IEEE International Conference on Computer and Communications (ICCC), Chengdu, China, Oct. 14-17, 2016. [DOI]

[38] Lawrence Ong, Badri N. Vellambi, Phee Lep Yeoh, Jörg Kliewer, Jinhong Yuan, "Secure Index Coding: Existence and Construction", Proceedings of the 2016 IEEE International Symposium on Information Theory (ISIT 2016), Barcelona, Spain, pp. 2834-2838, July 10-15, 2016. [pdf|DOI]

[37] Behzad Asadi, Lawrence Ong, Sarah J. Johnson, "A Unified Inner Bound for the Two-Receiver Memoryless Broadcast Channel with Channel State and Message Side Information", Proceedings of the 2016 IEEE International Symposium on Information Theory (ISIT 2016), Barcelona, Spain,  pp. 175-179, July 10-15, 2016. [pdf|DOI]

[36] Chandra Thapa, Lawrence Ong, Sarah J. Johnson, "Generalized Interlinked Cycle Cover for Index Coding", Proceedings of the 2015 IEEE Information Theory Workshop (ITW 2015), Jeju Island, Korea, pp. 4-8, Oct. 11-15, 2015. [pdf|DOI]

[35] Lawrence Ong, "Capacity Results for the Multi-Way Relay Channel with Common Messages", Proceedings of the 2015 IEEE International Symposium on Information Theory (ISIT 2015), Hong Kong, pp. 1886-1890, June 14-19, 2015. [pdf|DOI]

[34] Lawrence Ong, "The Half-Duplex Gaussian Two-Way Relay Channel with Direct Links", Proceedings of the 2015 IEEE International Symposium on Information Theory (ISIT 2015), Hong Kong, pp. 1891-1895, June 14-19, 2015. [pdf|DOI]

[33] Behzad Asadi, Lawrence Ong, Sarah J. Johnson, "A Unified Scheme for Two-Receiver Broadcast Channels with Receiver Message Side Information", Proceedings of the 2015 IEEE International Symposium on Information Theory (ISIT 2015), Hong Kong, pp. 386-390, June 14-19, 2015. [pdf|DOI]

[32] Chandra Thapa, Lawrence Ong, Sarah J. Johnson, "A New Index Coding Scheme Exploiting Interlinked Cycles", Proceedings of the 2015 IEEE International Symposium on Information Theory (ISIT 2015), Hong Kong, pp. 1024-1028, June 14-19, 2015. [pdf|DOI]

[31] Behzad Asadi, Lawrence Ong, Sarah J. Johnson, "Coding Schemes for a Class of Receiver Message Side Information in AWGN Broadcast Channels", Proceedings of the 2014 IEEE Information Theory Workshop (ITW 2014), Hobart, Australia, pp. 571-575,  Nov. 2-5, 2014. [pdf|DOI]

[30] Sachini Jayasooriya, Sarah J. Johnson, Lawrence Ong, Regina Berretta, "Optimization of Graph Based Codes for Belief Propagation Decoding", Proceedings of the 2014 IEEE Information Theory Workshop (ITW 2014), Hobart, Australia, pp. 456-460, Nov. 2-5, 2014. [pdf|DOI]

[29] Lawrence Ong, "Linear Codes are Optimal for Index-Coding Instances with Five or Fewer Receivers", Proceedings of the 2014 IEEE International Symposium on Information Theory (ISIT 2014), Honolulu, USA, pp. 491-495, June 29-July 4, 2014. [pdf|DOI]

[28] Behzad Asadi, Lawrence Ong, Sarah J. Johnson, "The Capacity of Three-Receiver AWGN Broadcast Channels with Receiver Message Side Information", Proceedings of the 2014 IEEE International Symposium on Information Theory (ISIT 2014), Honolulu, USA, pp. 2899-2903, June 29-July 4, 2014. [pdf|DOI]

[27] Lawrence Ong, "A New Class of Index Coding Instances Where Linear Coding is Optimal", Proceedings of the 2014 International Symposium on Network Coding (NetCod 2014), Aalborg, Denmark, June 27-28, 2014. [pdf|DOI]

[26] Lawrence Ong, Sarah J. Johnson, Christopher M. Kellett, "Optimal Coding Functions for Pairwise Message Sharing on Finite-Field Multi-Way Relay Channels", Proceedings of the 2014 IEEE International Conference on Communications (ICC 2014), Sydney, Australia, pp. 1866-1871, June 10-14, 2014. [pdf|DOI]

[25] Lawrence Ong, Fabian Lim, Chin Keong Ho, "The Multi-Sender Multicast Index Coding", Proceedings of the 2013 IEEE International Symposium on Information Theory (ISIT 2013), Istanbul, Turkey, pp. 1147-1151, July 7-12, 2013. [pdf (extended version)|DOI]

[24] Lawrence Ong, "Capacity Results for Two Classes of Three-Way Channels", Proceedings of the 12th International Symposium on Communications & Information Technologies (ISCIT 2012), Gold Coast, Australia, pp. 471-476, Oct. 2-5, 2012. [pdf|DOI]

[23] Lawrence Ong, Roy Timo, Sarah J. Johnson, "The Finite Field Multi-Way Relay Channel with Correlated Sources: Beyond Three Users", Proceedings of the 2012 IEEE International Symposium on Information Theory (ISIT 2012), Cambridge, USA, pp. 791-795, July 1-6, 2012. [pdf|DOI]

[22] Lawrence Ong, Sarah J. Johnson, "The Capacity Region of Restricted Multi-Way Relay Channels with Deterministic Uplinks", Proceedings of the 2012 IEEE International Symposium on Information Theory (ISIT 2012), Cambridge, USA, pp. 786-790, July 1-6, 2012. [pdf|DOI]

[21] Lawrence Ong, Chin Keong Ho, "Optimal Index Codes for a Class of Multicast Networks with Receiver Side Information", Proceedings of the 2012 IEEE International Conference on Communications (ICC 2012), Ottawa, Canada, pp. 2213-2218, June 10-15, 2012. [pdf|DOI]

[20] Lawrence Ong, Christopher M. Kellett, Sarah J. Johnson, "On Achievable Rate Regions of the Asymmetric AWGN Two-Way Relay Channel", Proceedings of the 2011 IEEE International Symposium on Information Theory (ISIT 2011), Saint Petersburg, Russia, pp. 84-88, July 31–Aug. 5, 2011. [pdf|DOI]

[19] Lawrence Ong, Roy Timo, Gottfried Lechner, Sarah J. Johnson, Christopher M. Kellett, "The Finite Field Multi-Way Relay Channel with Correlated Sources: The Three-User Case", Proceedings of the 2011 IEEE International Symposium on Information Theory (ISIT 2011), Saint Petersburg, Russia, pp. 2238-2242, July 31–Aug. 5, 2011. [pdf|DOI]

[18] Roy Timo, Lawrence Ong, Gottfried Lechner, "The Two-Way Relay Network with Arbitrarily Correlated Sources and an Orthogonal MAC", Proceedings of the IEEE Data Compression Conference (DCC 2011), Snowbird, USA, pp. 253–262, Mar. 29–31, 2011. [pdf|DOI]

[17] Gottfried Lechner, Roy Timo, Lawrence Ong, "Sparse Graph Codes for the Two-Way Relay Network with Correlated Sources", Proceedings of the IEEE Data Compression Conference (DCC 2011), Snowbird, USA, pp. 466 Mar. 29–31, 2011. [pdf|DOI]

[16] Lawrence Ong, Sarah J. Johnson, Christopher M. Kellett, "The Capacity of a Class of Multi-Way Relay Channels", Proceedings of the 12th IEEE International Conference on Communications Systems (ICCS 2010), Singapore, pp. 346–350, Nov. 17–19, 2010. [pdf|DOI]

[15] Lawrence Ong, Christopher M. Kellett, Sarah J. Johnson, "Functional-Decode-Forward for the General Discrete Memoryless Two-Way Relay Channel", Proceedings of the 12th IEEE International Conference on Communications Systems (ICCS 2010), Singapore, pp. 351–355, Nov. 17–19, 2010. [pdf|DOI]

[14] Lawrence Ong, Christopher M. Kellett, and Sarah J. Johnson, "Capacity Theorems for the AWGN Multi-Way Relay Channel", Proceedings of the 2010 IEEE International Sysmposium on Information Theory (ISIT 2010), Austin, USA, pp. 664–668, June 13–18, 2010. [pdf|DOI]

[13] Lawrence Ong, Sarah J. Johnson, Christopher M. Kellett, "The Binary-Symmetric Parallel-Relay Network", Proceedings of the 2010 IEEE International Sysmposium on Information Theory (ISIT 2010), Austin, USA, pp. 654–658, June 13–18, 2010. [pdf|DOI]

[12] Lawrence Ong, Sarah J. Johnson, Christopher M. Kellett, "Achievable Rate Regions of the Butterfly Network with Noisy Links and End-to-End Error Correction", Proceedings of the 2009 IEEE Information Theory Workshop (ITW 2009), Taormina, Italy, pp. 554–558, Oct. 11–16, 2009. [pdf|DOI]

[11] Lawrence Ong, Sarah J. Johnson, Mehul Motani, "Optimal Schedules for the D-node Half Duplex Phase Fading MRC", Proceedings of the 2009 IEEE International Symposium on Information Theory (ISIT 2009), Seoul, South Korea, pp. 1006–1010, June 28–July 3, 2009. [pdf|DOI]

[10] Wei Wang, Lawrence Ong, Mehul Motani, "Transmission Schedule Optimization for Half-Duplex Multiple-Relay Networks", Proceedings of the 7th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt 2009), Seoul, South Korea, June 23–27, 2009. [pdf|DOI]

[9] Lawrence Ong, Wei Wang, Mehul Motani, "Achievable Rates and Schedules for Half Duplex Phase Fading Multiple-Relay Networks", Proceedings of the 2008 International Symposium on Information Theory and its Applications (ISITA 2008), Auckland, New Zealand, pp. 984–989, Dec. 7–10, 2008. [pdf|DOI]

[8] Lawrence Ong, Wei Wang, Mehul Motani, "Achievable Rates and Optimal Schedules for Half Duplex Multiple-Relay Networks", Proceedings of the 46th Annual Allerton Conference on Communication, Control, and Computing (Allerton Conf 2008), Monticello, USA, pp. 1317–1324, Sept. 23–26, 2008. [pdf|DOI]

[7] Lawrence Ong, Mehul Motani, "Optimal Routing for the Gaussian Multiple-Relay Channel with Decode-and-Forward", Proceedings of the 2007 IEEE International Symposium on Information Theory (ISIT 2007), Nice, France, pp. 1061–1065, June 24–29, 2007. [pdf|DOI]

[6] Lawrence Ong, Mehul Motani, "Optimal Routing for Decode-and-Forward based Cooperation in Wireless Networks", Proceedings of the 4th Annual IEEE Communications Society Conference on Sensor, Mesh, and Ad Hoc Communications and Networks (SECON 2007), San Diego, USA, pp. 334–343, June 18–21, 2007. [pdf|DOI]

[5] Lawrence Ong, Mehul Motani, "The Multiple Access Channel with Feedback and Correlated Sources", Proceedings of the 2006 IEEE International Symposium on Information Theory (ISIT 2006), Seattle, USA, pp. 2129–2133, July 9–14, 2006. [pdf|DOI]

[4] Lawrence Ong, Mehul Motani, "The Capacity of the Single Source Multiple Relay Single Destination Mesh Network", Proceedings of the 2006 IEEE International Symposium on Information Theory (ISIT 2006), Seattle, USA, pp. 1673–1677, July 9–14, 2006. [pdf|DOI]

[3] Lawrence Ong, Mehul Motani, "Achievable Rates for the Multiple Access Channels with Feedback and Correlated Sources", Proceedings of the 43rd Annual Allerton Conference on Communication, Control, and Computing (Allerton Conf 2005), Monticello, USA, Sept. 28–30, 2005. [pdf]

[2] Lawrence Ong, Mehul Motani, "Myopic Coding in Multiple Relay Channels", Proceedings of the 2005 IEEE International Symposium on Information Theory (ISIT 2005), Adelaide, Australia, pp. 1091–1095, Sept. 4–9, 2005. [pdf|DOI]

[1] Lawrence Ong, Mehul Motani, "Myopic Coding in Wireless Networks", Proceedings of the 39th Conference on Information Sciences and Systems (CISS 2005), Baltimore, USA, Mar. 16–18, 2005. [pdf


Invited Talks

[6] Lawrence Ong, "Information-Theoretic Security via Side Information", Invited talk at the 17th Australian Communications Theory Workshop (AusCTW 2017), Canberra, Australia, Jan. 18, 2017.

[5] Lawrence Ong, "Index coding - improving broadcast rates using side information", Invited talk at the Celebration of Shannon's 100th Birthday, University of Technology Sydney, Australia, Apr. 29, 2016

[4] Lawrence Ong, "Linear Index Codes are Optimal Up to Five Nodes", Workshop at BIRS: Between Shannon and Hamming: Network Information Theory and Combinatorics (15w5130), Banff, Canada, Mar. 3, 2015 [pdf

[3] Lawrence Ong, "Functional-Decode-Forward for Multi-Way Relay Channels", Invited talk at Institute for Infocomm Research (I2R), Singapore, Non.23, 2010.
(sponsored by IEEE Vehicular Technology Society (VTS) Chapter, Singapore Section)

[2] Lawrence Ong, "Functional-Decode-Forward for Multi-Way Relay Channels", Invited talk at Institute for Telecommunications Research (ITR), Adelaide, Australia, Aug. 17, 2010.

[1] Lawrence Ong, "Coding Strategies for Relay Networks", Invited talk at the 11th Australian Communications Theory Workshop (AusCTW 2010), Canberra, Australia, Feb. 4, 2010.


Theses

[3] Lawrence Ong, "Cooperative Coding and Routing in Multiple-Terminal Wireless Networks", PhD Thesis, National University of Singapore, Singapore, Dec. 2007. [pdf]

[2] Lawrence Ong, "An Investigation of an Agent-Based Scheduling in Decentralised Manufacturing Control", MPhil Thesis, University of Cambridge, UK, Aug. 2003. [pdf]

[1] Lawrence Ong, "Simulation Study of Adaptive Filters for Receiver Design on Fading", BEng Thesis, National University of Singapore, Singapore, 2001.