385 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Newcastle UniversityGB60 papers
- Australian National UniversityAU25 papers
- The University of SydneyAU22 papers
- UNSW SydneyAU21 papers
- Commonwealth Scientific and Industrial Research OrganisationAU19 papers
- The University of MelbourneAU17 papers
- Center for Astrophysics Harvard & SmithsonianUS16 papers
- The University of QueenslandAU16 papers
- Uppsala UniversitySE16 papers
- National Astronomical Observatory of JapanJP15 papers
- Centre National de la Recherche ScientifiqueFR14 papers
- Max Planck Institute for AstronomyDE13 papers
60 papers · 1 filter
Adaptive Power Allocation and User Scheduling for LEO Satellites using Channel Predictions
Lachlan Drake, Lawrence Ong, Duy T. Ngo
Low earth orbit (LEO) satellites are a key technology to enable connectivity for rural and remote users. Communication satellites in LEO can provide coverage to much larger areas t…
Performance Bounds on Pliable Index Coding Using Absent Receivers
Lawrence Ong, Badri N. Vellambi, Parastoo Sadeghi +1
We characterise bounds on the optimal broadcast rate for a few classes of pliable-index-coding instances. Unlike the majority of currently solved instances, which belong to a speci…
Fundamental Limits of Bistatic Integrated Sensing and Communications over Memoryless Relay Channels
Yao Liu, Min Li, Lawrence Ong +1
The problem of bistatic integrated sensing and communications over memoryless relay channels is considered, where destination concurrently decodes the message sent by the source an…
Fundamental Limits of Multiple-Access Integrated Sensing and Communication Systems
Yao Liu, Min Li, An Liu +2
A state-dependent discrete memoryless multiple access channel is considered to model an integrated sensing and communication system, where two transmitters wish to convey messages…
On Converse Results for Secure Index Coding
Yucheng Liu, Lawrence Ong, Parastoo Sadeghi +2
In this work, we study the secure index coding problem where there are security constraints on both legitimate receivers and eavesdroppers. We develop two performance bounds (i.e.,…
The Secure Two-Receiver Broadcast Channel With One-Sided Receiver Side Information
Jin Yeong Tan, Lawrence Ong, Behzad Asadi
This paper studies the problem of secure communcation over the two-receiver discrete memoryless broadcast channel with one-sided receiver side information and with a passive eavesd…
Structural Characteristics of Two-Sender Index Coding
Chandra Thapa, Lawrence Ong, Sarah J. Johnson +1
This paper studies index coding with two senders. In this setup, source messages are distributed among the senders possibly with common messages. In addition, there are multiple re…
On the Fundamental Limits of Random Non-orthogonal Multiple Access in Cellular Massive IoT
Mahyar Shirvanimoghaddam, Massimo Condoluci, Mischa Dohler +1
Machine-to-machine (M2M) constitutes the communication paradigm at the basis of Internet of Things (IoT) vision. M2M solutions allow billions of multi-role devices to communicate w…
An Equivalence Between Secure Network and Index Coding
Lawrence Ong, Badri N. Vellambi, Jörg Kliewer +1
We extend the equivalence between network coding and index coding by Effros, El Rouayheb, and Langberg to the secure communication setting in the presence of an eavesdropper. Speci…
Raptor Codes for Higher-Order Modulation Using a Multi-Edge Framework
Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Lawrence Ong +1
In this paper, we represent Raptor codes as multi-edge type low-density parity-check (MET-LDPC) codes, which gives a general framework to design them for higher-order modulation us…
Analysis and design of Raptor codes using a multi-edge framework
Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Lawrence Ong +1
The focus of this paper is on the analysis and design of Raptor codes using a multi-edge framework. In this regard, we first represent the Raptor code as a multi-edge type low-dens…
Cooperative Multi-Sender Index Coding
Min Li, Lawrence Ong, Sarah J. Johnson
In this paper, we propose a new coding scheme and establish new bounds on the capacity region for the multi-sender unicast index-coding problem. We revisit existing partitioned Dis…
Millimeter Wave Beam Alignment: Large Deviations Analysis and Design Insights
Chunshan Liu, Min Li, Stephen V. Hanly +2
In millimeter wave cellular communication, fast and reliable beam alignment via beam training is crucial to harvest sufficient beamforming gain for the subsequent data transmission…
Graph-Theoretic Approaches to Two-Sender Index Coding
Chandra Thapa, Lawrence Ong, Sarah J. Johnson
Consider a communication scenario over a noiseless channel where a sender is required to broadcast messages to multiple receivers, each having side information about some messages.…
Path-Following Algorithms for Beamforming and Signal Splitting in RF Energy Harvesting Networks
Ali A. Nasir, Hoang D. Tuan, Duy T. Ngo +2
We consider the joint design of transmit beamforming and receive signal-splitting ratios in the downlink of a wireless network with simultaneous radio-frequency (RF) information an…
Optimal Finite-Length and Asymptotic Index Codes for Five or Fewer Receivers
Lawrence Ong
Index coding models broadcast networks in which a sender sends different messages to different receivers simultaneously, where each receiver may know some of the messages a priori.…
A Multiway Relay Channel with Balanced Sources
Lawrence Ong, Roy Timo
We consider a joint source-channel coding problem on a finite-field multiway relay channel, and we give closed-form lower and upper bounds on the optimal source-channel rate. These…
A Joint Optimization Technique for Multi-Edge Type LDPC Codes
Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Lawrence Ong +1
This paper considers the optimization of multi-edge type low-density parity-check (METLDPC) codes to maximize the decoding threshold. We propose an algorithm to jointly optimize th…
Design and Analysis of Transmit Beamforming for Millimetre Wave Base Station Discovery
Chunshan Liu, Min Li, Iain B. Collings +2
In this paper, we develop an analytical framework for the initial access (a.k.a. Base Station (BS) discovery) in a millimeter-wave (mm-wave) communication system and propose an eff…
Interlinked Cycles for Index Coding: Generalizing Cycles and Cliques
Chandra Thapa, Lawrence Ong, Sarah J. Johnson
We consider a graphical approach to index coding. While cycles have been shown to provide coding gain, only disjoint cycles and cliques (a specific type of overlapping cycles) have…
Massive Multiple Access Based on Superposition Raptor Codes for M2M Communications
Mahyar Shirvanimoghaddam, Mischa Dohler, Sarah J. Johnson
Machine-to-machine (M2M) wireless systems aim to provide ubiquitous connectivity between machine type communication (MTC) devices without any human intervention. Given the exponent…
Secure Index Coding: Existence and Construction
Lawrence Ong, Badri N. Vellambi, Phee Lep Yeoh +2
We investigate the construction of weakly-secure index codes for a sender to send messages to multiple receivers with side information in the presence of an eavesdropper. We derive…
A Unified Inner Bound for the Two-Receiver Memoryless Broadcast Channel with Channel State and Message Side Information
Behzad Asadi, Lawrence Ong, Sarah J. Johnson
We consider the two-receiver memoryless broadcast channel with states where each receiver requests both common and private messages, and may know part of the private message reques…
Raptor Codes in the Low SNR Regime
Mahyar Shirvanimoghaddam, Sarah J. Johnson
In this paper, we revisit the design of Raptor codes for binary input additive white Gaussian noise (BIAWGN) channels, where we are interested in very low signal to noise ratios (S…