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Associate Professor Sarah Johnson

ARC Future Fellow

School of Elect Engineering and Computer Science (Electrical and Computer Engineering)

A Key to a Secure Future

In a digital age where information privacy is key, University of Newcastle Associate Professor Sarah Johnson is cracking the code on keeping business, government, defence and your secrets secure.

Associate Professor Sarah Johnson with mathematical equations A/Prof Johnson is an expert on error correction codes which improve the reliability and quality of digital technologies such as television, DVD players, mobile phones and the Internet.

In partnership with Quintessence Labs and researchers at the Australian National University, A/Prof Johnson is developing next generation quantum key distribution (QKD) technology that will enable two parties to produce a random shared key known only to them. The key can then be used to encrypt and decrypt messages to guarantee secure transmission of data.

Information like email, network security, e-commerce, credit-card, security numbers and sensitive company documents are some of the applications QKD could be used for, according to A/Prof Johnson.

"Banks, government, defence forces and the corporate world are just some of the areas set to benefit from the information protection solutions we are designing," A/Prof Johnson said.

"Technology is a major part of today's critical infrastructure from health to power to e-commerce. Data security is of the utmost importance, whether it's a company protecting itself from espionage attacks or a country guarding against cyber-terrorism," she said.

One of the greatest challenges of cryptography is ensuring that a third party does not get access to the secret key and therefore confidential information. Specialising in iterative error-correcting coding, A/Prof Johnson role is to ensure that the transfer of the key is clear, reliable and secure.

A fundamental aspect of digital communications, error-correction coding uses complex mathematical algorithms to eliminate 'noise' or errors during transmission – such as interference from storms or competing digital devices.

Current methods for secure communications are in danger of becoming cracked in the future by quantum computers that can factor large numbers, which is why QKD technology is gaining so much attention, as the Australian Research Council (ARC) Future Fellow explains.

"In the case of quantum cryptography, we're not just using error-correction coding to clean up 'noise', we're using it to detect interference and the presence of any third party 'listening in'," she said.

"The very nature of a quantum mechanical system means that if anyone even observes or listens in on the quantum channel, it alters the state of the photons and thus the message, alerting the users to interference.

Quantum cryptographic systems can be used in optical fibre networks, wireless point to point, satellite uploads. As Australia moves toward a National Broadband Network (NBN), technologies like QKD will become increasingly important.

"QKD technology is the way of the future and has already been used to protect bank transfers, ballot results and computer networks in Europe. For example, Geneva residents used quantum cryptography to transmit their voting results for the 2007 parliamentary elections.

"It has been quite expensive to use QKD, but the new type of continuous variable QKD we are investigating uses standard telecommunications-type receivers rather than single photon detectors making it significantly cheaper to produce."

The QKD technology is part of a $300,000 ARC Linkage Grant with an expected product date by 2016.

"With technology expanding so rapidly, there is a growing need for better and faster error correction," said A/Prof. Johnson, "Ultimately, new error correction codes can be incorporated into the next generation of communications equipment and we're currently studying best case scenarios for networks where multiple users can use a system together securely."  

Johnson authored a book in 2010 titled Iterative Error Correction, which discusses the theory, design and implementation of powerful coding techniques known as turbo, low-density parity-check and repeat-accumulate codes. 

Based at the University of Newcastle's Centre for Complex Dynamic Systems and Control and the Signal Processing and Microelectronics Group, A/Prof Johnson is also working on improving digital communication, like mobiles and wi-fi networks, through her specialty in iterative error correction coding.  

In addition to her error-correction coding work, A/Prof Johnson has been collaborating with leading neuroscientists at the University of Newcastle over the past 18 months through her work with the Priority Research Centre for Bioinformatics, Biomarker Discovery and Information-Based Medicine

Creating solutions using mathematical algorithms across three different projects, A/Prof Johnson is aiming to improve current medical image processing, create a new imaging device and, ultimately, make steps towards a virtual reality system for medical research.

"Working towards improving the imaging and building a new imaging device is an interesting project because it involves quite a lot of different technological areas and collaborating with colleagues in computer science, electrical engineering and biomedical science."

Whether it is protecting or unveiling information, A/Prof Johnson is helping deliver the keys to a clearer image of the future.

Sarah Johnson

A Key to a Secure Future

Associate Professor Sarah Johnson performs research in the fields of signal processing, error correction coding and information theory.

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Technology troubleshooter

Dr Sarah Johnson designs complex computer codes that work behind the scenes to ensure digital communications are clearly conveyed.

Sarah Johnson in the server room 

Dr Sarah Johnson enjoys solving mathematical problems and her research field of error correction coding provides an endless array of numerical challenges. Error correction technologies are fundamental to digital communications, from DVD players to the National Broadband Network, and in most cases work imperceptibly in the background to correct corruptions in transmission so quickly that users are never aware of a problem.

"Just about any time we communicate, whether it is a text message to a friend or a critical communication, we are using error correction to get that message through," Johnson advises.

Error correction detects and rectifies corruptions caused to digital communications by what is broadly termed 'noise'– interference from factors such as stormy weather, physical barriers in the landscape or competition with nearby digital devices. It does not always work, as evidenced when mobile phone reception fails or a television picture momentarily drops out, but without it our communications would be far less reliable.

Johnson's research with the University's Signal Processing and Microelectronics group focuses on developing new error correction codes for next-generation communication technologies. "With digital technology expanding so rapidly, there is a growing need for better and faster error correction," she explains. "Technology that was unimaginable 10 years ago is now pushing the boundaries of our current approaches to correcting digital errors."

Designing error correction codes involves complex algorithmic computations but Johnson describes the fundamental process as adding extra numerical information to a digital message – a 'checking sequence' that bears a mathematical relationship to the original message – which can then be used to detect errors and recover the original data.

A University of Newcastle electrical engineering scholar, Johnson was awarded her PhD in 2003 and launched her research career with a fellowship at NICTA, Australia's Information and Communications Technology Research Centre of Excellence. She is now a senior researcher at the University, supported by an Australian Research Council (ARC) Future Fellowship. Her specialty field is iterative error correction coding, which has widespread application in cellular communications, digital video broadcasting and wi-fi networks.

Johnson has published in high-impact IEEE (Institute of Electrical and Electronics Engineers) journals and authored a book in 2009 titled Iterative Error Correction, through Cambridge University Press. It discusses the theory, design and implementation of powerful coding techniques known as turbo, low-density parity-check and repeat-accumulate codes.

Johnson also has a strong research interest in information theory – the analysis of the limits of error correction coding – and is working on an ARC-funded project with a University of Newcastle colleague, Dr Lawrence Ong, studying best-case scenarios for multiple-user communication networks.

"It is relatively easy to determine the best-case scenario for error correction in a traditional situation where there is only one person sending and one receiving," Johnson asserts. "It is a lot more complicated to design and understand fundamental limits in networks that have multiple people trying to communicate at the same time, which is increasingly the way people communicate today." 

In a novel project, Johnson has a commercial consultancy with cyber defence company QuintessenceLabs to design a unique cryptography application for their ultra-secure electronic key systems.

"Error correction plays a vital role in so many technologies that there is an endless stream of applications for the work I do. There are so many exciting problems that keep me motivated every day."

Visit the Centre for Bioinformatics, Biomarker Discovery and Information-Based Medicine

Sarah Johnson in the server room

Technology troubleshooter

Dr Sarah Johnson designs complex computer codes that work behind the scenes to ensure digital communications are clearly conveyed.

Read more

Career Summary

Biography

Associate Professor Sarah Johnson performs research in the fields of signal processing, error correction coding and information theory. The field of signal processing encompasses the task of representing, detecting, filtering, or reproducing signals for a wide range of purposes including modelling, analysis and communications. Error correction coding is concerned with the reliable transmission and storage of digital data, while information theory investigates the fundamental theoretical limits of these tasks. 

Dr Johnson has authored a book, Iterative Error Correction Codes, published by Cambridge University Press and published over 70 technical papers. Her research has been supported by six Australian Research Council (ARC) DP grants, an ARC Future Fellowship, an ARC Linkage Project and industry-sponsored projects.

Dr Johnson’s research has encompassed a number of application areas including:

Digital Communications

This research focuses on the design, analysis and application of iterative error correction codes to enable the communication of a digital message without error despite an imperfect communications medium. Such codes are used in a large range of applications including mobile phones, digital television, wireless local area networks, deep space communications, long haul optical communications and hard disk storage. 

Quantum Key Distribution Technologies

Together with industry partners Dr Johnson is designing signal processing algorithms for new a quantum key distribution technology that will enable two parties to produce a random shared key known only to them. Information like e-commerce, security numbers and sensitive company documents are some of the applications quantum key distribution could be used to protect.

Intrinsic Optical Imaging 

One of newest areas of biomedical research is real-time optical imaging, which allows non-invasive brain imaging of a conscious subject. Intrinsic optical signal imaging allows the visualisation and mapping of activity related changes within the brain with excellent spatial and temporal resolution. Together with partners in Biomedical Sciences, this project involved the design and construction of a custom optical imaging platform with new optical imaging hardware and new signal processing software. This technology is currently being used to study recovery from brain injury.

High Throughput Automated Glial Reconstruction and Analysis

Glia are cells in the brain newly discovered to be involved in controlling process that were once considered to be exclusively the domain of neurons. The function of these cells is critically linked to their morphology (shape) and a better understanding of these cells requires new analysis technologies. Together with partners in Biomedical Sciences, this project is developing algorithms, and corresponding software, for high-throughput automated reconstruction of glial cells from immunohistochemical and immunofluorescent labelled tissue sections with the aim of better understanding the function of glia in the healthy brain and their role in brain injury. 

A full list of publications is available at google scholar 


Qualifications

  • PhD (Electrical Engineering), University of Newcastle
  • Bachelor of Engineering (Electrical), University of Newcastle

Keywords

  • Biomedical signal processing
  • Error correction coding
  • Information theory
  • Signal processing

Languages

  • English (Fluent)

Fields of Research

Code Description Percentage
090609 Signal Processing 30
080401 Coding and Information Theory 70

Professional Experience

UON Appointment

Title Organisation / Department
Associate Professor University of Newcastle
School of Elect Engineering and Computer Science
Australia

Academic appointment

Dates Title Organisation / Department
1/01/2013 -  Membership - Organising Committee IEEE International Conference on Communications Organising Committee IEEE International Conference on Communications
Australia
1/01/2013 -  Membership - International Technical Program Committee IEEE Information Theory Workshop (ITW) International Technical Program Committee IEEE Information Theory Workshop (ITW)
Australia
1/01/2013 -  Membership - International Technical Program Committee IEEE International Symposium on Turbo Codes International Technical Program Committee IEEE International Symposium on Turbo Codes
Australia
1/03/2012 - 1/12/2015 Future Fellow University of Newcastle
Australia
1/01/2012 - 31/12/2012 Membership - International Technical Program Committee IEEE International Symposium on Turbo Codes International Technical Program Committee IEEE International Symposium on Turbo Codes
Australia
1/01/2012 - 31/12/2012 Membership - International Technical Program Committee IEEE PIMRC International Technical Program Committee IEEE PIMRC
Australia
1/06/2007 - 1/03/2012 Senior Research Fellow

UoN Research Fellowship

University of Newcastle
Australia
1/01/2006 - 31/12/2006 Membership - International Technical Program Committee IEEE VTC International Technical Program Committee IEEE VTC
Australia
1/06/2004 - 1/06/2007 Australian Postdoc Fellowship (APD)

ARC - Research Fellowships Scheme

Australia Research Council
Australia
1/01/2004 -  Membership - Institute of Electrical and Electronic Engineers (IEEE) Institute of Electrical & Electronic Engineers (IEEE)
Australia
1/08/2003 - 1/07/2004 Research Fellow National ICT Australia
Australia

Awards

Research Award

Year Award
2007 Pro Vice-Chancellor’s Award for Research Excellence
University of Newcastle
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.

Highlighted Publications

Year Citation Altmetrics Link
2010 Johnson SJ, Iterative Error Correction: Turbo, Low-Density Parity-Check and Repeat-Accumulate Codes, Cambridge University Press, Cambridge, UK, 356 (2010) [A2]
Citations Scopus - 2
2012 Ong LL, Johnson SJ, Kellett CM, 'The half-duplex AWGN single-relay channel: Full decoding or partial decoding?', IEEE Transactions on Communications, 60 3156-3160 (2012) [C1]
Citations Scopus - 5Web of Science - 5
Co-authors Chris Kellett, Lawrence Ong
2013 Timo R, Lechner G, Ong L, Johnson S, 'Multi-Way Relay Networks: Orthogonal Uplink, Source-Channel Separation and Code Design', IEEE TRANSACTIONS ON COMMUNICATIONS, 61 753-768 (2013) [C1]
DOI 10.1109/TCOMM.2012.121112.110730
Citations Scopus - 7Web of Science - 7
Co-authors Lawrence Ong
2013 Johnson S, Lechner G, 'Spatially Coupled Repeat-Accumulate Codes', IEEE COMMUNICATIONS LETTERS, 17 373-376 (2013) [C1]
DOI 10.1109/LCOMM.2013.010313.122343
Citations Scopus - 10Web of Science - 9
2015 Johnson SJ, Walker FR, 'Strategies to improve quantitative assessment of immunohistochemical and immunofluorescent labelling', SCIENTIFIC REPORTS, 5 (2015) [C1]
DOI 10.1038/srep10607
Citations Scopus - 2Web of Science - 3
Co-authors Rohan Walker

Book (1 outputs)

Year Citation Altmetrics Link
2010 Johnson SJ, Iterative Error Correction: Turbo, Low-Density Parity-Check and Repeat-Accumulate Codes, Cambridge University Press, Cambridge, UK, 356 (2010) [A2]
Citations Scopus - 2

Chapter (1 outputs)

Year Citation Altmetrics Link
2003 Johnson SJ, Weller SR, 'Low-density parity-check codes: Design and decoding', Wiley Encyclopedia of Telecommunications, Wiley Interscience, Brisbane 1-18 (2003) [B1]
Co-authors Steven Weller

Journal article (35 outputs)

Year Citation Altmetrics Link
2016 Shirvanimoghaddam M, Dohler M, Johnson S, 'Massive Multiple Access Based on Superposition Raptor Codes for M2M Communications', IEEE Transactions on Wireless Communications, (2016)
DOI 10.1109/TWC.2016.2623305
Co-authors Mahyar Shirvanimoghaddam
2016 Shirvanimoghaddam M, Johnson S, 'Raptor Codes in the Low SNR Regime', IEEE Transactions on Communications, (2016)
DOI 10.1109/TCOMM.2016.2606410
Co-authors Mahyar Shirvanimoghaddam
2016 Jayasooriya S, Shirvanimoghaddam M, Ong L, Johnson SJ, 'A Joint Optimization Technique for Multi-Edge Type LDPC Codes.', CoRR, abs/1605.04664 (2016)
Co-authors Mahyar Shirvanimoghaddam, Lawrence Ong
2016 Jayasooriya S, Shirvanimoghaddam M, Ong L, Lechner G, Johnson SJ, 'New Density Evolution Approximation for LDPC and Multi-Edge Type LDPC Codes.', CoRR, abs/1605.04665 (2016)
Co-authors Lawrence Ong, Mahyar Shirvanimoghaddam
2016 Ong LK, Zhao Z, Kluge M, TeBay C, Zalewska K, Dickson PW, et al., 'Reconsidering the role of glial cells in chronic stress-induced dopaminergic neurons loss within the substantia nigra? Friend or foe?', Brain Behav Immun, (2016)
DOI 10.1016/j.bbi.2016.10.001
Co-authors Linkooi Ong, Phil Dickson, Michael Nilsson, Rohan Walker
2015 Johnson SJ, Walker FR, 'Strategies to improve quantitative assessment of immunohistochemical and immunofluorescent labelling', SCIENTIFIC REPORTS, 5 (2015) [C1]
DOI 10.1038/srep10607
Citations Scopus - 2Web of Science - 3
Co-authors Rohan Walker
2015 Kongsui R, Johnson SJ, Graham BA, Nilsson M, Walker FR, 'A combined cumulative threshold spectra and digital reconstruction analysis reveal structural alterations of microglia within the prefrontal cortex following low-dose LPS administration', Neuroscience, 310 629-640 (2015) [C1]

© 2015 IBRO.Sickness behaviors have become the focus of great interest in recent years as they represent a clear case of how peripheral disturbances in immune signaling can disru... [more]

© 2015 IBRO.Sickness behaviors have become the focus of great interest in recent years as they represent a clear case of how peripheral disturbances in immune signaling can disrupt quite complex behaviors. In the current study, we were interested in examining whether we could identify any significant morphological disturbances in microglia associated with these sickness-like behaviors in adult male Sprague-Dawley rats. We chose lipopolysaccharide (LPS 100 µg/kg/i.p.), to induce sickness-like behaviors as it is the most well-validated approach to do so in rodents and humans. We were particularly interested in examining changes in microglia within the prefrontal cortex (PFC) as several recent neuroimaging studies have highlighted significant functional changes in this region following peripheral LPS administration. Paraformaldehyde-fixed tissue was collected from animals 24 h post LPS administration and labeled immunohistochemically with an antibody directed to bind to Iba-1, a protein known to be involved in the structural remodeling of microglia. To analyze changes, we have made use of two recently described image analysis procedures. The first is known as cumulative threshold spectra (CTS) analysis. The second involves the unsupervised digital reconstruction of microglia. We undertook these complementary analysis of microglial cells in the both the pre- and infralimbic divisions of the PFC. Our results indicated that microglial soma size was significantly enlarged, while cell processes had contracted slightly following LPS administration. To our knowledge this study is to first to definitely demonstrate substantial microglial disturbances within the PFC following LPS delivered at a dose that was sufficient to induce significant sickness-like behavior.

DOI 10.1016/j.neuroscience.2015.09.061
Citations Scopus - 2Web of Science - 2
Co-authors Brett Graham, Michael Nilsson, Rohan Walker
2015 Asadi B, Ong L, Johnson SJ, 'Optimal Coding Schemes for the Three-Receiver AWGN Broadcast Channel With Receiver Message Side Information', IEEE TRANSACTIONS ON INFORMATION THEORY, 61 5490-5503 (2015) [C1]
DOI 10.1109/TIT.2015.2463277
Co-authors Lawrence Ong
2015 Patience MJ, Zouikr I, Jones K, Clarkson AN, Isgaard J, Johnson SJ, et al., 'Photothrombotic Stroke Induces Persistent Ipsilateral and Contralateral Astrogliosis in Key Cognitive Control Nuclei', NEUROCHEMICAL RESEARCH, 40 362-371 (2015) [C1]
DOI 10.1007/s11064-014-1487-8
Citations Scopus - 2Web of Science - 2
Co-authors Michael Nilsson, Rohan Walker
2015 Jones KA, Zouikr I, Patience M, Clarkson AN, Isgaard J, Johnson SJ, et al., 'Chronic stress exacerbates neuronal loss associated with secondary neurodegeneration and suppresses microglial-like cells following focal motor cortex ischemia in the mouse', Brain, Behavior, and Immunity, 48 57-67 (2015) [C1]
DOI 10.1016/j.bbi.2015.02.014
Citations Scopus - 4Web of Science - 3
Co-authors Neil Spratt, Michael Nilsson, Rohan Walker
2014 Kongsui R, Beynon SB, Johnson SJ, Mayhew J, Kuter P, Nilsson M, Walker FR, 'Chronic stress induces prolonged suppression of the P2X7 receptor within multiple regions of the hippocampus: A cumulative threshold spectra analysis', Brain, Behavior, and Immunity, 42 69-80 (2014) [C1]
DOI 10.1016/j.bbi.2014.05.017
Citations Scopus - 7Web of Science - 6
Co-authors Michael Nilsson, Rohan Walker
2014 Asadi B, Ong L, Johnson SJ, 'On Index Coding in Noisy Broadcast Channels with Receiver Message Side Information', IEEE COMMUNICATIONS LETTERS, 18 640-643 (2014) [C1]
DOI 10.1109/LCOMM.2014.020414.132589
Citations Scopus - 2Web of Science - 2
Co-authors Lawrence Ong
2014 Kongsui R, Beynon SB, Johnson SJ, Walker FR, 'Quantitative assessment of microglial morphology and density reveals remarkable consistency in the distribution and morphology of cells within the healthy prefrontal cortex of the rat', JOURNAL OF NEUROINFLAMMATION, 11 (2014) [C1]
DOI 10.1186/s12974-014-0182-7
Citations Web of Science - 8
Co-authors Rohan Walker
2014 Johnson SJ, Lechner G, Chandrasetty VA, 'Memory-efficient quasi-cyclic spatially coupled low-density parity-check and repeat-accumulate codes', IET Communications, 8 3179-3188 (2014) [C1]
DOI 10.1049/iet-com.2014.0384
Citations Scopus - 1Web of Science - 1
2014 Ong L, Johnson SJ, Kellett CM, 'On the capacity of the binary-symmetric parallel-relay network', TRANSACTIONS ON EMERGING TELECOMMUNICATIONS TECHNOLOGIES, 25 217-230 (2014) [C1]
DOI 10.1002/ett.2561
Citations Scopus - 1Web of Science - 5
Co-authors Lawrence Ong, Chris Kellett
2013 Tynan RJ, Beynon SB, Hinwood M, Johnson SJ, Nilsson M, Woods JJ, Walker FR, 'Chronic stress-induced disruption of the astrocyte network is driven by structural atrophy and not loss of astrocytes', Acta Neuropathologica, 126 75-91 (2013) [C1]
DOI 10.1007/s00401-013-1102-0
Citations Scopus - 26Web of Science - 26
Co-authors Madeleine Hinwood, Rohan Walker, Michael Nilsson
2013 Timo R, Lechner G, Ong L, Johnson S, 'Multi-Way Relay Networks: Orthogonal Uplink, Source-Channel Separation and Code Design', IEEE TRANSACTIONS ON COMMUNICATIONS, 61 753-768 (2013) [C1]
DOI 10.1109/TCOMM.2012.121112.110730
Citations Scopus - 7Web of Science - 7
Co-authors Lawrence Ong
2013 Ong L, Lechner G, Johnson SJ, Kellett CM, 'The Three-User Finite-Field Multi-Way Relay Channel with Correlated Sources', IEEE TRANSACTIONS ON COMMUNICATIONS, 61 3125-3135 (2013) [C1]
DOI 10.1109/TCOMM.2013.061913.120987
Citations Scopus - 3Web of Science - 3
Co-authors Chris Kellett, Lawrence Ong
2013 Johnson S, Lechner G, 'Spatially Coupled Repeat-Accumulate Codes', IEEE COMMUNICATIONS LETTERS, 17 373-376 (2013) [C1]
DOI 10.1109/LCOMM.2013.010313.122343
Citations Scopus - 10Web of Science - 9
2012 Ong LL, Kellett CM, Johnson SJ, 'On the equal-rate capacity of the AWGN multiway relay channel', IEEE Transactions on Information Theory, 58 5761-5769 (2012) [C1]
Citations Scopus - 25Web of Science - 21
Co-authors Lawrence Ong, Chris Kellett
2012 Ong LL, Motani M, Johnson SJ, 'On capacity and optimal scheduling for the half-duplex multiple-relay channel', IEEE Transactions on Information Theory, 58 5770-5784 (2012) [C1]
Citations Scopus - 12Web of Science - 8
Co-authors Lawrence Ong
2012 Ong LL, Johnson SJ, Kellett CM, 'The half-duplex AWGN single-relay channel: Full decoding or partial decoding?', IEEE Transactions on Communications, 60 3156-3160 (2012) [C1]
Citations Scopus - 5Web of Science - 5
Co-authors Chris Kellett, Lawrence Ong
2012 Ong LL, Johnson SJ, 'The capacity region of the restricted two-way relay channel with any deterministic uplink', IEEE Communications Letters, 16 396-399 (2012) [C1]
DOI 10.1109/LCOMM.2012.011312.112198
Citations Scopus - 6Web of Science - 3
Co-authors Lawrence Ong
2011 Ong LL, Johnson SJ, Kellett CM, 'The capacity region of multiway relay channels over finite fields with full data exchange', IEEE Transactions on Information Theory, 57 3016-3031 (2011) [C1]
DOI 10.1109/TIT.2011.2120010
Citations Scopus - 47Web of Science - 45
Co-authors Chris Kellett, Lawrence Ong
2011 Johnson SJ, Ong LL, Kellett CM, 'Joint channel-network coding strategies for networks with low-complexity relays', European Transactions on Telecommunications, 22 396-406 (2011) [C1]
Citations Scopus - 7Web of Science - 6
Co-authors Chris Kellett, Lawrence Ong
2010 Ong LL, Johnson SJ, Kellett CM, 'An optimal coding strategy for the binary multi-way relay channel', IEEE Communications Letters, 14 330-332 (2010) [C1]
DOI 10.1109/LCOMM.2010.04.092427
Citations Scopus - 41Web of Science - 36
Co-authors Chris Kellett, Lawrence Ong
2009 Johnson SJ, 'A finite-length algorithm for LDPC codes without repeated edges on the binary erasure channel', IEEE Transactions on Information Theory, 55 27-32 (2009) [C1]
DOI 10.1109/tit.2008.2008118
Citations Scopus - 1
2009 Johnson SJ, 'Burst erasure correcting LDPC codes', IEEE Transactions on Communications, 57 641-652 (2009) [C1]
DOI 10.1109/tcomm.2009.03.060468
Citations Scopus - 14Web of Science - 8
2009 Johnson SJ, Weller SR, 'Practical interleavers for repeat-accumulate codes', IEEE Transactions on Communications, 57 1225-1228 (2009) [C1]
DOI 10.1109/tcomm.2009.05.060382
Citations Scopus - 5Web of Science - 2
Co-authors Steven Weller
2008 Johnson SJ, Weller SR, 'Combinatorial interleavers for systematic regular repeat-accumulate codes', IEEE Transactions on Communications, 56 1201-1206 (2008) [C1]
DOI 10.1109/tcomm.2008.041247
Citations Scopus - 11Web of Science - 9
Co-authors Steven Weller
2006 Johnson SJ, Weller SR, 'Constraining LDPC degree distributions for improved error floor performance', IEEE Communications Letters, 10 103-105 (2006) [C1]
DOI 10.1109/LCOMM.2006.02001.
Citations Scopus - 15Web of Science - 7
Co-authors Steven Weller
2004 Johnson SJ, Weller SR, 'Codes for iterative decoding from partial geometies', IEEE Transactions on Communications, 52 236-243 (2004) [C1]
DOI 10.1109/TCOMM.2003.822737
Citations Scopus - 32Web of Science - 26
Co-authors Steven Weller
2003 Johnson SJ, Weller SR, 'Resolvable 2-Designs for Regular Low-Density Parity-Check Codes', IEEE Transactions on Communications, 51 1413-1419 (2003) [C1]
DOI 10.1109/TCOMM.2003.816946
Citations Scopus - 31Web of Science - 22
Co-authors Steven Weller
2003 Johnson SJ, Weller SR, 'A Family if Irregular LDPC Codes with low Encoding Complexity', IEEE Communication Letters, 7 79-81 (2003) [C1]
DOI 10.1109/LCOMM.2002.808375
Citations Scopus - 78Web of Science - 64
Co-authors Steven Weller
2003 Weller SR, Johnson SJ, 'Regular low-density parity-check codes from oval designs', European Transactions on Teleconmmunications, 14 399-409 (2003) [C1]
DOI 10.1002/ett.939
Citations Scopus - 13Web of Science - 12
Co-authors Steven Weller
Show 32 more journal articles

Conference (44 outputs)

Year Citation Altmetrics Link
2016 Johnson SJ, Chandrasetty VA, Lance AM, 'Repeat-accumulate codes for reconciliation in continuous variable quantum key distribution', 2016 Australian Communications Theory Workshop, AusCTW 2016 (2016) [E1]

© 2016 IEEE.This paper investigates the design of low-complexity error correction codes for the verification step in continuous variable quantum key distribution (CVQKD) systems.... [more]

© 2016 IEEE.This paper investigates the design of low-complexity error correction codes for the verification step in continuous variable quantum key distribution (CVQKD) systems. We design new coding schemes based on quasi-cyclic repeat-accumulate codes which demonstrate good performances for CVQKD reconciliation. Given quasi-cyclic repeat-accumulate codes' commercial maturity, low implementation complexity and existing high-speed ASIC implementations, this makes these codes viable candidates for commercial CVQKD systems.

DOI 10.1109/AusCTW.2016.7433603
Citations Scopus - 1
2016 Shirvanimoghaddam M, Johnson S, Lance AM, 'Design of Raptor Codes in the Low SNR Regime with Applications in Quantum Key Distribution' (2016)
Co-authors Mahyar Shirvanimoghaddam
2016 Asadi B, Ong L, Johnson SJ, 'A unified inner bound for the two-receiver memoryless broadcast channel with channel state and message side information', IEEE International Symposium on Information Theory - Proceedings (2016)

© 2016 IEEE.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 ... [more]

© 2016 IEEE.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 requested by the other receiver as receiver message side information (RMSI). We address two categories of the channel (i) channel with states known causally to the transmitter, and (ii) channel with states known non-causally to the transmitter. Starting with the channel without RMSI, we first propose a transmission scheme and derive an inner bound for the causal category. We then unify our inner bound for the causal category and the best-known inner bound for the non-causal category, although their transmission schemes are different. Moving on to the channel with RMSI, we first apply a pre-coding to the transmission schemes of the causal and non-causal categories without RMSI. We then derive a unified inner bound as a result of having a unified inner bound when there is no RMSI, and applying the same pre-coding to both categories. We show that our inner bound is tight for some new cases as well as the cases whose capacity region was known previously.

DOI 10.1109/ISIT.2016.7541284
Co-authors Lawrence Ong
2016 Shirvanimoghaddam M, Johnson S, 'Approaching the Capacity of AWGN Channels using Multi-Layer Raptor Codes and Superposition Modulation', 2016 IEEE International Symposium on Information Theory (ISIT) (2016) [E1]
Co-authors Mahyar Shirvanimoghaddam
2016 Johnson SJ, Abdolhoseini M, Walker F, 'Automated Tracing of Microglia Using Multilevel Thresholding and Minimum Spanning Trees', http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7580725 (2016)
DOI 10.1109/EMBC.2016.7590922
Co-authors Rohan Walker
2015 Thapa C, Ong L, Johnson SJ, 'Generalized interlinked cycle cover for index coding', ITW 2015 - 2015 IEEE Information Theory Workshop (2015) [E1]

© 2015 IEEE.A source coding problem over a noiseless broadcast channel where the source is preinformed about the contents of the cache of all receivers, is an index coding proble... [more]

© 2015 IEEE.A source coding problem over a noiseless broadcast channel where the source is preinformed about the contents of the cache of all receivers, is an index coding problem. Furthermore, if each message is requested by one receiver, then we call this an index coding problem with a unicast message setting. This problem can be represented by a directed graph. In this paper, we first define a structure (we call generalized interlinked cycle (GIC)) in directed graphs. A GIC consists of cycles which are interlinked in some manner (i.e., not disjoint), and it turns out that the GIC is a generalization of cliques and cycles. We then propose a simple scalar linear encoding scheme with linear time encoding complexity. This scheme exploits GICs in the digraph. We prove that our scheme is optimal for a class of digraphs with message packets of any length. Moreover, we show that our scheme can outperform existing techniques, e.g., partial clique cover, local chromatic number, composite-coding, and interlinked cycle cover.

DOI 10.1109/ITWF.2015.7360723
Co-authors Lawrence Ong
2015 Walker FR, Zouikr I, Patience M, Clarkson A, Isgaard J, Johnson S, et al., 'Chronic stress exacerbates neuronal loss associated with secondary neurodegeneration and suppresses microglial-like cells following focal motor cortex ischemia in the mouse', GLIA (2015) [E3]
Co-authors Neil Spratt, Michael Nilsson, Rohan Walker
2015 Turley JA, Nilsson M, Walker FR, Johnson SJ, 'A comparison of signal processing techniques for Intrinsic Optical Signal imaging in mice', Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS (2015) [E1]

© 2015 IEEE.Intrinsic Optical Signal imaging is a technique which allows the visualisation and mapping of activity related changes within the brain with excellent spatial and tem... [more]

© 2015 IEEE.Intrinsic Optical Signal imaging is a technique which allows the visualisation and mapping of activity related changes within the brain with excellent spatial and temporal resolution. We analysed a variety of signal and image processing techniques applied to real mouse imaging data. The results were compared in an attempt to overcome the unique issues faced when performing the technique on mice and improve the understanding of post processing options available.

DOI 10.1109/EMBC.2015.7319828
Co-authors Michael Nilsson, Rohan Walker
2015 Thapa C, Ong L, Johnson SJ, 'A new index coding scheme exploiting interlinked cycles', IEEE International Symposium on Information Theory - Proceedings (2015) [E1]

© 2015 IEEE.We study the index coding problem in the unicast message setting, i.e., where each message is requested by one unique receiver. This problem can be modeled by a direc... [more]

© 2015 IEEE.We study the index coding problem in the unicast message setting, i.e., where each message is requested by one unique receiver. This problem can be modeled by a directed graph. We propose a new scheme called interlinked cycle cover, which exploits interlinked cycles in the directed graph, for designing index codes. This new scheme generalizes the existing clique cover and cycle cover schemes. We prove that for a class of infinitely many digraphs with messages of any length, interlinked cycle cover provides an optimal index code. Furthermore, the index code is linear with linear time encoding complexity.

DOI 10.1109/ISIT.2015.7282610
Citations Scopus - 1
Co-authors Lawrence Ong
2015 Asadi B, Ong L, Johnson SJ, 'A unified scheme for two-receiver broadcast channels with receiver message side information', IEEE International Symposium on Information Theory - Proceedings (2015) [E1]

© 2015 IEEE.This paper investigates the capacity regions of two-receiver broadcast channels where each receiver (i) has both common and private-message requests, and (ii) knows p... [more]

© 2015 IEEE.This paper investigates the capacity regions of two-receiver broadcast channels where each receiver (i) has both common and private-message requests, and (ii) knows part of the private message requested by the other receiver as side information. We first propose a transmission scheme and derive an inner bound for the two-receiver memoryless broadcast channel. We next prove that this inner bound is tight for the deterministic channel and the more capable channel, thereby establishing their capacity regions.We show that this inner bound is also tight for all classes of two-receiver broadcast channels whose capacity regions were known prior to this work. Our proposed scheme is consequently a unified capacity-achieving scheme for these classes of broadcast channels.

DOI 10.1109/ISIT.2015.7282482
Citations Scopus - 1
Co-authors Lawrence Ong
2014 Ong L, Johnson SJ, Kellett CM, 'Optimal coding functions for pairwise message sharing on finite-field multi-way relay channels', 2014 IEEE International Conference on Communications, ICC 2014 (2014) [E1]

This paper considers the finite-field multi-way relay channel with pairwise message sharing, where multiple users exchange messages through a single relay and where the users may ... [more]

This paper considers the finite-field multi-way relay channel with pairwise message sharing, where multiple users exchange messages through a single relay and where the users may share parts of their source messages (meaning that some message parts are known/common to more than one user). In this paper, we design an optimal functional-decode-forward coding scheme that takes the shared messages into account. More specifically, we design an optimal function for the relay to decode (from the users on the uplink) and forward (back to the users on the downlink). We then show that this proposed function-decode-forward coding scheme can achieve the capacity region of the finite-field multi-way relay channel with pairwise message sharing. This paper generalizes our previous result for the case of three users to any number of users. © 2014 IEEE.

DOI 10.1109/ICC.2014.6883595
Citations Scopus - 1Web of Science - 1
Co-authors Chris Kellett, Lawrence Ong
2014 Asadi B, Ong L, Johnson SJ, 'The capacity of three-receiver AWGN broadcast channels with receiver message side information', IEEE International Symposium on Information Theory - Proceedings (2014) [E1]

This paper investigates the capacity region of three-receiver AWGN broadcast channels where the receivers (i) have private-message requests and (ii) know the messages requested by... [more]

This paper investigates the capacity region of three-receiver AWGN broadcast channels where the receivers (i) have private-message requests and (ii) know the messages requested by some other receivers as side information. We classify these channels based on their side information into eight groups, and construct different transmission schemes for the groups. For six groups, we characterize the capacity region, and show that it improves both the best known inner and outer bounds. For the remaining two groups, we improve the best known inner bound by using side information during channel decoding at the receivers. © 2014 IEEE.

DOI 10.1109/ISIT.2014.6875364
Citations Scopus - 6Web of Science - 6
Co-authors Lawrence Ong
2014 Ong L, Asadi B, Johnson SJ, 'Coding schemes for a class of receiver message side information in AWGN broadcast channels', IEEE Information Theory Workshop (ITW) (2014) [E1]
DOI 10.1109/ITW.2014.6970896
Citations Scopus - 2
Co-authors Lawrence Ong
2014 Jayasooriya S, Johnson SJ, Ong L, Berretta R, 'Optimization of graph based codes for belief propagation decoding', Information Theory Workshop (ITW), 2014 IEEE (2014) [E1]
DOI 10.1109/ITW.2014.6970873
Citations Scopus - 1
Co-authors Lawrence Ong, Regina Berretta
2014 Ye T, Veitch D, Johnson SJ, 'RA-inspired codes for efficient information theoretic multi-path network security', 2014 International Symposium on Information Theory and its Applications (ISITA) (2014) [E1]
2012 Lechner G, Johnson SJ, 'Absorbing sets and cycles', 2012 7th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2012 (2012) [E1]
2012 Ong LL, Timo R, Johnson SJ, 'The finite field multi-way relay channel with correlated sources: Beyond three users', 2012 IEEE International Symposium on Information Theory Proceedings (ISIT) (2012) [E1]
Citations Scopus - 1Web of Science - 1
Co-authors Lawrence Ong
2012 Ong LL, Johnson SJ, 'The capacity region of restricted multi-way relay channels with deterministic uplinks', 2012 IEEE International Symposium on Information Theory Proceedings (ISIT) (2012) [E1]
Citations Scopus - 2Web of Science - 2
Co-authors Lawrence Ong
2011 Ong LL, Kellett CM, Johnson SJ, 'On achievable rate regions of the asymmetric AWGN two-way relay channel', 2011 IEEE International Symposium on Information Theory Proceedings (ISIT) (2011) [E1]
DOI 10.1109/ISIT.2011.6034256
Co-authors Chris Kellett, Lawrence Ong
2011 Ong LL, Timo R, Lechner G, Johnson SJ, Kellett CM, 'The finite field multi-way relay channel with correlated sources: The three-user case', 2011 IEEE International Symposium on Information Theory Proceedings (ISIT) (2011) [E1]
Citations Scopus - 1
Co-authors Chris Kellett, Lawrence Ong
2010 Ong LL, Johnson SJ, Kellett CM, 'The binary-symmetric parallel-relay network', Proceedings of the 2010 IEEE International Symposium on Information Theory (ISIT 2010) (2010) [E1]
DOI 10.1109/ISIT.2010.5513571
Co-authors Chris Kellett, Lawrence Ong
2010 Ong LL, Kellett CM, Johnson SJ, 'Capacity theorems for the AWGN multi-way relay channel', Proceedings of the 2010 IEEE International Symposium on Information Theory (ISIT 2010) (2010) [E1]
DOI 10.1109/ISIT.2010.5513576
Citations Scopus - 23Web of Science - 26
Co-authors Chris Kellett, Lawrence Ong
2010 Ong LL, Johnson SJ, Kellett CM, 'The capacity of a class of multi-way relay channels', Proceedings of the 12th IEEE International Conference on Communications Systems (ICCS 2010) (2010) [E1]
DOI 10.1109/ICCS.2010.5686491
Citations Scopus - 1
Co-authors Lawrence Ong, Chris Kellett
2010 Ong LL, Johnson SJ, Kellett CM, 'Functional-decode-forward for the general discrete memoryless two-way relay channel', Proceedings of the 12th IEEE International Conference on Communications Systems (ICCS 2010) (2010) [E1]
DOI 10.1109/ICCS.2010.5686490
Citations Scopus - 4
Co-authors Lawrence Ong, Chris Kellett
2010 Hayes DF, Johnson SJ, Weller SR, 'Irregular repeat-accumulate-like codes with improved error floor performance', 2010 IEEE Information Theory Workshop, ITW 2010 - Proceedings (2010) [E1]
DOI 10.1109/CIG.2010.5592734
Co-authors Steven Weller
2009 Ong LL, Johnson SJ, Motani M, 'Optimal schedules for the D-node half duplex phase fading MRC', 2009 IEEE International Symposium on Information Theory (ISIT 2009) (2009) [E1]
DOI 10.1109/isit.2009.5206072
Citations Scopus - 1
Co-authors Lawrence Ong
2009 Ong LL, Johnson SJ, Kellett CM, 'Achievable rate regions of the butterfly network with noisy links and end-to-end error correction', 2009 IEEE Information Theory Workshop (ITW 2009) (2009) [E1]
DOI 10.1109/ITW.2009.5351229
Citations Scopus - 1
Co-authors Lawrence Ong, Chris Kellett
2007 Johnson SJ, 'LDPC codes for correcting multiple erasure bursts', 8th Australian Communication Theory Workshop, AusCTW 2007 (2007)

In this paper low-density parity-check (LDPC) codes are considered for burst erasure channels. Multiple burst erasure correcting LDPC codes are constructed using superposition and... [more]

In this paper low-density parity-check (LDPC) codes are considered for burst erasure channels. Multiple burst erasure correcting LDPC codes are constructed using superposition and the burst erasure correcting performances of the resulting codes are derived as a property of the stopping set size of the base matrices and the choice of permutation matrices for the superposition.

2007 Johnson SJ, Kellett CM, 'Joint Network and Channel Coding for Cooperative Networks', 2007 AUSTRALASIANTELECOMMUNICATION NETWORKS AND APPLICATIONS CONFERENCE (2007)
Co-authors Chris Kellett
2006 Johnson SJ, Weller SR, 'Practical Interleavers for Systematic Repeat-Accumulate Codes', 2006 IEEE 63rd Vehicular Technology Conference (2006) [E1]
Citations Scopus - 4
Co-authors Steven Weller
2006 Grant A, Kennedy R, Hanlen LW, Johnson SJ, Teal PD, 'Editorial remarks', Proceedings - 7th Australian Communications Theory Workshop, 2006 (2006)
2006 Johnson SJ, 'Erasure Correcting LDPC Codes For Channels With Packet Losses', Proceedings of the NEWCOM-ACORN Joint Workshop, Vienna, September 2006 (2006) [E1]
2006 Hanlen LW, Johnson SJ, Teal PD, 'Proceedings 7th Australian Communications Theory Workshop 2006', Proceedings 7th Australian Communications Theory Workshop 2006 (2006) [E4]
2005 Johnson SJ, Weller SR, 'Interleaver and Accumulator Design For Systematic Repeat-Accumulate Codes', Proceedings 6th Australian Communications Theory Workshop 2005 : 2-4 February 2005, The University of Queensland, Brisbane, Australia (2005) [E1]
Citations Scopus - 4Web of Science - 1
Co-authors Steven Weller
2005 Johnson SJ, 'Finite-Length Repeat-Accumulate Codes on The Binary Erasure Channel', 2005 Asia-Pacific Conference on Communications, Perth, Western Australia, 3-5 October 2005 (2005) [E1]
Citations Scopus - 4
2005 Johnson SJ, Weller SR, 'Constructions for Irregular Repeat-Accumulate Codes', Proceedings of 2005 IEEE International Symposium on Information Theory (2005) [E1]
Citations Scopus - 4
Co-authors Steven Weller
2004 Johnson SJ, Weller SR, 'Structured low-density parity-check codes over non-binary fields', Proceedings of the 5th Australian Communication Theory Workshop 2004 (2004) [E1]
Co-authors Steven Weller
2003 Johnson SJ, Weller SR, 'High-Rate LDPC Codes from Unital Designs', Proceedings for GLOBECOM 2003 (2003) [E1]
Citations Scopus - 5Web of Science - 3
Co-authors Steven Weller
2003 Johnson SJ, Weller SR, 'Can Cyclic Codes be Useful Low-Density Parity-Check Codes', Proceedings for AUSCTW 2003 (2003) [E1]
Co-authors Steven Weller
2003 Brown RA, Johnson SJ, Weller SR, 'Performance of Space-Time Block Codes with Finite Geometry LDPC Outer Codes', Proceedings for AUSCTW 2003 (2003) [E1]
Co-authors Steven Weller
2002 Johnson SJ, Weller SR, 'Codes for Iterative Decoding from Partial Geometries', International Symposium on Information Theory 2002 (2002) [E1]
Citations Scopus - 4Web of Science - 5
Co-authors Steven Weller
2002 Johnson SJ, Weller SR, 'Quasi-cyclic LDPC Codes from Difference Families', Proceedings 3rd Australian Communications Theory Workshop 2002 (2002) [E1]
Co-authors Steven Weller
2001 Johnson SJ, Weller SR, 'Construction of Low-density Parity-check Codes from Kirkman Triple Systems', IEEE Global Telecommunications Conference (2001) [E1]
Citations Scopus - 24Web of Science - 5
Co-authors Steven Weller
2001 Johnson SJ, Weller SR, 'Regular low-density parity-check codes from combinatorial designs', Proceedings 2001 IEEE Information Theory Workshop (2001)
Citations Scopus - 39Web of Science - 44
Co-authors Steven Weller
Show 41 more conferences

Other (1 outputs)

Year Citation Altmetrics Link
2015 Shirvanimoghaddam M, Johnson SJ, 'Raptor Codes in the Low SNR Regime', (2015)
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Grants and Funding

Summary

Number of grants 21
Total funding $3,724,394

Click on a grant title below to expand the full details for that specific grant.


Highlighted grants and funding

New strategies to transmit data: Coping with exponential growth in demand$361,213

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson, Doctor Lawrence Ong, Dr Gottfried Lechner
Scheme Discovery Projects
Role Lead
Funding Start 2015
Funding Finish 2017
GNo G1400187
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

New error correction strategies for continuous variable quantum key distribution$322,558

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson, Dr Andrew Lance
Scheme Linkage Projects
Role Lead
Funding Start 2013
Funding Finish 2016
GNo G1201139
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Compression of Digital Data: Bridging The Gap Between Theory and Practice$320,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team

Ingmar Land

Scheme Discovery Project
Role Investigator
Funding Start 2012
Funding Finish 2014
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

New high-performance iterative error correction codes$667,420

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson
Scheme Future Fellowships
Role Lead
Funding Start 2011
Funding Finish 2016
GNo G1100437
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Optimising Cooperation in Multiterminal Wireless Networks$150,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson
Scheme Discovery Projects
Role Lead
Funding Start 2010
Funding Finish 2012
GNo G0189995
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Iterative coding for next generation networks$335,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson, Associate Professor Christopher Kellett
Scheme Discovery Projects
Role Lead
Funding Start 2008
Funding Finish 2010
GNo G0187513
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Construction methods and analysis tools for repeat-accumulate error correction codes$112,128

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson
Scheme Discovery Projects
Role Lead
Funding Start 2006
Funding Finish 2008
GNo G0185285
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Structured low-density parity-check codes for next-generation digital communications$257,466

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Steven Weller, Associate Professor Sarah Johnson
Scheme Discovery Projects
Role Investigator
Funding Start 2004
Funding Finish 2006
GNo G0183017
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

20161 grants / $325,297

HMRI MRSP Infrastructure (12-16) Brain and Mental Health Program – Stroke and Brain Injury$325,297

Funding body: Hunter Medical Research Institute

Funding body Hunter Medical Research Institute
Project Team Doctor Neil Spratt, Professor Mark Parsons, Doctor Frederick Walker, Doctor Coralie English, Professor Michael Nilsson, Conjoint Professor Chris Levi, Doctor Andrew Bivard, Associate Professor Jane Maguire, Conjoint Professor Parker Magin, Associate Professor Sarah Johnson, Professor John Attia
Scheme NSW MRSP Infrastructure Grant
Role Investigator
Funding Start 2016
Funding Finish 2016
GNo G1600733
Type Of Funding Other Public Sector - State
Category 2OPS
UON Y

20152 grants / $381,213

New strategies to transmit data: Coping with exponential growth in demand$361,213

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson, Doctor Lawrence Ong, Dr Gottfried Lechner
Scheme Discovery Projects
Role Lead
Funding Start 2015
Funding Finish 2017
GNo G1400187
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Blocking the negative effects of stress on the brain to promote better healing of the brain after stroke$20,000

Funding body: Hunter Medical Research Institute

Funding body Hunter Medical Research Institute
Project Team Doctor Frederick Walker, Doctor Lin Kooi Ong, Doctor Ming Yang, Associate Professor Sarah Johnson
Scheme Project Grant
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo G1501384
Type Of Funding Grant - Aust Non Government
Category 3AFG
UON Y

20142 grants / $62,000

New error correction strategies for continuous variable quantum key distribution$42,000

Funding body: Quintessence Labs Pty. Ltd.

Funding body Quintessence Labs Pty. Ltd.
Project Team Associate Professor Sarah Johnson, Dr Thomas Symul, Dr Andrew Lance
Scheme Linkage Projects Partner Funding
Role Lead
Funding Start 2014
Funding Finish 2016
GNo G1201271
Type Of Funding Grant - Aust Non Government
Category 3AFG
UON Y

Improving error correction performance through spatial coupling $20,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Associate Professor Sarah Johnson
Scheme Near Miss Grant
Role Lead
Funding Start 2014
Funding Finish 2014
GNo G1301383
Type Of Funding Internal
Category INTE
UON Y

20134 grants / $404,558

New error correction strategies for continuous variable quantum key distribution$322,558

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson, Dr Andrew Lance
Scheme Linkage Projects
Role Lead
Funding Start 2013
Funding Finish 2016
GNo G1201139
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Improving error correction performance through spatial coupling$50,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Associate Professor Sarah Johnson
Scheme Near Miss Grant
Role Lead
Funding Start 2013
Funding Finish 2013
GNo G1300453
Type Of Funding Internal
Category INTE
UON Y

Integrated virtual reality jet ball system$20,000

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team

Sarah Johnson

Scheme Equipment Grant
Role Lead
Funding Start 2013
Funding Finish 2013
GNo
Type Of Funding Internal
Category INTE
UON N

Image processing of neural cell morphology$12,000

Funding body: Faculty of Engineering

Funding body Faculty of Engineering
Project Team

Sarah Johnson

Scheme Strategic Pilot Grant
Role Lead
Funding Start 2013
Funding Finish 2013
GNo
Type Of Funding Internal
Category INTE
UON N

20123 grants / $435,000

Compression of Digital Data: Bridging The Gap Between Theory and Practice$320,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team

Ingmar Land

Scheme Discovery Project
Role Investigator
Funding Start 2012
Funding Finish 2014
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

Error correction for quantum key distribution$100,000

Funding body: Enterprise Connect

Funding body Enterprise Connect
Project Team

Sarah Johnson

Scheme Researchers in Business
Role Lead
Funding Start 2012
Funding Finish 2012
GNo
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON N

2011 Emerging Research Leaders Program$15,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Associate Professor Sarah Johnson
Scheme Emerging Research Leaders Program
Role Lead
Funding Start 2012
Funding Finish 2012
GNo G1201064
Type Of Funding Internal
Category INTE
UON Y

20111 grants / $667,420

New high-performance iterative error correction codes$667,420

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson
Scheme Future Fellowships
Role Lead
Funding Start 2011
Funding Finish 2016
GNo G1100437
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

20101 grants / $150,000

Optimising Cooperation in Multiterminal Wireless Networks$150,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson
Scheme Discovery Projects
Role Lead
Funding Start 2010
Funding Finish 2012
GNo G0189995
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

20081 grants / $335,000

Iterative coding for next generation networks$335,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson, Associate Professor Christopher Kellett
Scheme Discovery Projects
Role Lead
Funding Start 2008
Funding Finish 2010
GNo G0187513
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

20072 grants / $529,312

2007 Research Fellowship$514,312

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Associate Professor Sarah Johnson
Scheme Research Fellowship
Role Lead
Funding Start 2007
Funding Finish 2012
GNo G0187099
Type Of Funding Internal
Category INTE
UON Y

2007 Research Fellowship Project Grant$15,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Associate Professor Sarah Johnson
Scheme Fellowship Grant
Role Lead
Funding Start 2007
Funding Finish 2007
GNo G0188110
Type Of Funding Internal
Category INTE
UON Y

20061 grants / $112,128

Construction methods and analysis tools for repeat-accumulate error correction codes$112,128

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson
Scheme Discovery Projects
Role Lead
Funding Start 2006
Funding Finish 2008
GNo G0185285
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

20051 grants / $50,000

Australian Communications Research Network (ACoRN)$50,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Steven Weller, Professor Brett Ninness, Associate Professor Sarah Johnson
Scheme Research Networks
Role Investigator
Funding Start 2005
Funding Finish 2009
GNo G0186088
Type Of Funding Scheme excluded from IGS
Category EXCL
UON Y

20042 grants / $272,466

Structured low-density parity-check codes for next-generation digital communications$257,466

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Steven Weller, Associate Professor Sarah Johnson
Scheme Discovery Projects
Role Investigator
Funding Start 2004
Funding Finish 2006
GNo G0183017
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Design and evaluation of repeat-accumulate error correction codes for digital communications$15,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Associate Professor Sarah Johnson
Scheme Early Career Researcher Grant
Role Lead
Funding Start 2004
Funding Finish 2004
GNo G0184996
Type Of Funding Internal
Category INTE
UON Y
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Research Supervision

Number of supervisions

Completed1
Current6

Total current UON EFTSL

Masters0.5
PhD2.15

Current Supervision

Commenced Level of Study Research Title / Program / Supervisor Type
2015 PhD System Identification and Reconstruction of Glial Cell Microscopy Images
PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle
Principal Supervisor
2014 Masters The design and construction of an intrinsic optical signal brain imaging system and the development of signal processing techniques to investigate the effects of stroke in mice.
M Philosophy(Elec Engineering), Faculty of Engineering and Built Environment, The University of Newcastle
Principal Supervisor
2014 PhD Index Coding: How to Utilize Side Information?
PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle
Co-Supervisor
2013 PhD Broadcast Channels with Receiver Message Side Information
PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle
Co-Supervisor
2013 PhD Analysis and Design of Multi-Edge Type Low-Density Parity-Check Codes
PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle
Principal Supervisor
2011 PhD An Examination of How Environmental Disturbances Alter Microglia Morphology and Function Within the CNS
PhD (Human Physiology), Faculty of Health and Medicine, The University of Newcastle
Co-Supervisor

Past Supervision

Year Level of Study Research Title / Program / Supervisor Type
2005 PhD The Graphical Structure of Iterative Low-Density Parity-Check Decoding
Electrical Engineering, Australian National University
Co-Supervisor
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Research Collaborations

The map is a representation of a researchers co-authorship with collaborators across the globe. The map displays the number of publications against a country, where there is at least one co-author based in that country. Data is sourced from the University of Newcastle research publication management system (NURO) and may not fully represent the authors complete body of work.

Country Count of Publications
Australia 69
United Kingdom 3
New Zealand 3
Sweden 2
Singapore 2
More...
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News

Australian Research Council (ARC)

ARC Discovery Project funding success

November 19, 2014

Associate Professor Sarah Johnson and Dr Lawrence Ong have been awarded more than $355,000 in ARC Discovery Project funding commencing in 2015 for their research project New strategies to transmit data: Coping with exponential growth in demand.

Secure Communications Grant

$300,000 for secure communications research

August 16, 2013

University of Newcastle wins $300,000 to make digital communications secure

Grants for creativity

Creative Industries

June 28, 2013

A study concerning Creativity and Cultural Production in the Hunter Region was announced today as one of six University of Newcastle projects awarded highly prestigious Australian Research Council Linkage Project Grants worth a total of $1.8 million.

Associate Professor Sarah Johnson

Position

ARC Future Fellow
School of Elect Engineering and Computer Science
Faculty of Engineering and Built Environment

Focus area

Electrical and Computer Engineering

Contact Details

Email sarah.johnson@newcastle.edu.au
Phone (02) 4921 6028
Fax (02) 4921 6993

Office

Room EA G14
Building Engineering A
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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