75 citations · 705 across the 64 of their papers we have counts for
11 papers · 1 filter
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.…
The DoF Region of the Three-Receiver MIMO Broadcast Channel with Side Information and Its Relation to Index Coding Capacity
Behzad Asadi, Lawrence Ong, Sarah J. Johnson
We consider the three-receiver Gaussian multiple-input multiple-output (MIMO) broadcast channel with an arbitrary number of antennas at each of the transmitter and the receivers. W…
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…
New Density Evolution Approximation for LDPC and Multi-Edge Type LDPC Codes
Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Lawrence Ong +2
This paper considers density evolution for lowdensity parity-check (LDPC) and multi-edge type low-density parity-check (MET-LDPC) codes over the binary input additive white Gaussia…
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…