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Associate Professor Sarah Johnson

Associate Professor

School of Electrical Engineering and Computing (Electrical and Computer Engineering)

Engineering a better future

Associate Professor Sarah Johnson is applying engineering solutions to a range of end-user’s problems.

The basis of Sarah’s research is digital information and digital signals processing. She has developed an international profile in error correction codes, which are essential to establishing and maintaining secure and reliable transmission of data, which improve the reliability and quality of digital technologies such as television, mobile phones and the Internet.

"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," Sarah says.

Sarah’s fundamental contribution to secure information communication systems has demonstrated national and international impact, in both theory and end user applications. Her works in Low Density Parity Check Codes have significant implications for communications reliability, utilisation and simplified implementation.

In addition to making fundamental discoveries, Sarah actively engages with industry, most significantly collaborating with Quintessence Laboratories, developing ultra-secure quantum key enabled communication. This aims for the realisation and production of data communications systems with guaranteed security properties based on quantum technology.

She is also extensively engaged in applying digital signal processing in the field of biomedical engineering, with a focus on developing new technologies to improve the brain’s recovery following injury or disease. Sarah is currently working on new sensor-enhanced motor-learning technology to assist during recovery from stroke.

A University of Newcastle electrical engineering alumna, Sarah was awarded her PhD in 2004 and launched her research career with a fellowship at NICTA, Australia's Information and Communications Technology Research Centre of Excellence. She is now Associate Professor at the University of Newcastle and her specialty field is digital information and digital signals processing which has widespread application across a number of fields.

Sarah focusses on creating solutions through using mathematical algorithms and collaborating across a number of disciplines. Working with colleagues in computer science, electrical engineering and biomedical sciences Sarah aims to deliver the keys to a clearer image of the future.

Secure Communications

Sarah is an expert on error correction codes which improve the reliability and quality of digital technologies such as mobile phones, the internet, DVD players. Her specialty field is iterative error correction coding, which has widespread application in cellular communications, digital video broadcasting and wi-fi networks.

A collaboration with QuintessenceLabs is developing next-gen quantum key distribution (QKD) technology that will enable two parties to produce a random shared key, known only to them. This key can then be used to encrypt and decrypt messages to guarantee secure transmission of data.

This work has potential for a broad range of applications and industry where security and sensitivity is essential. “Banks, government, defence forces and the corporate world are just some of the areas set to benefit from these information protection solutions,” Sarah says.

“Data security is of the utmost importance, whether it’s a company protecting itself from espionage attacks or a country guarding against cyber-terrorism,” Sarah adds.

Technology-enhanced rehabilitation

Collaborating with colleagues from biomedical sciences, neuroscience, engineering and rehabilitation experts, Sarah is applying information and digital signals processing technologies to develop a sensor enhanced motor learning approach to augment physiotherapy treatment and improve rehabilitation outcomes for stroke patients.

Firstly, the SEML (sensor-enhanced motor-learning) project aims to support patients to optimize their physiotherapy exercises in a non-clinical environment, such as their own home. A visual model of the ideal movements for each exercise is modelled through readings from a movement tracking suit, which uses gyroscopes that track range motion (the suit is worn by a physiotherapist who demonstrates the exercises). This expert model is then incorporated into software that the patient can use in their home. The patient then does their exercises whilst wearing the movement tracking sensors and the software provides real-time guided feedback on how to adjust their actions. The system also records the patient’s performance for review by an expert.

Secondly, the Cerebrovascular Health Project aims to better understand the effectiveness of rehabilitation on the recovery of the brain. Non-invasive NIR (near-infrared) imaging is used to shine light on the brain to measure activity in different areas. As a particular part of brain becomes active blood flow increases oxygen levels. Because the oxygenated areas reflect and refract the light differently, the infrared image can show which areas of the brain are active. If the infrared imaging is captured during the physiotherapy exercises, feedback can be provided on which movements are working to stimulate brain function.

Women in STEM

As an engineer, it’s no surprise that Sarah has a keen interest in promoting STEM. This led to her co-found HunterWISE, a group dedicated to promoting and supporting girls and women in STEM.

HunterWISE features two interlinked actions aimed at increasing the number of girls and women participating in STEM through a school program and a series of networking events across the Hunter for women STEM professionals. This approach is designed to steer women toward STEM, and encourage their retention in the STEM pipeline.

In 2017 Sarah was awarded a NSW Premier’s Prize for Excellence in Engineering & Communications Technologies. “It is a great privilege to receive this award which recognises the importance of Science and Engineering to our community.”

“I really want to advance the biomedical projects to get it to a point where we can send SEML home with patients and really make a difference to their recovery.”

Sarah Johnson

Engineering a better 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

Sarah Johnson graduated from the University of Newcastle with a Bachelor degree in Electrical Engineering (1st class Honors and university medal) in 2000 and PhD in 2004. She has been awarded a CSIRO postgraduate scholarship, an Australian Research Council Postgraduate Research Fellowship and an Australian Research Council Future Fellowship. She has published over 100 academic research articles and a book with Cambridge University Press. Her research has been supported by six Australian Research Council (ARC) DP grants, an ARC Linkage Project and industry-sponsored projects. Sarah is currently and Associate Professor and Deputy Head of School (Research) in the School of Electrical Engineering and Computing at the University of Newcastle.

Research

I perform research in the fields of signal processing and information theory applied to communications and biomedical technologies:

Secure 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. My current research focus is on code design for Machine-to-Machine (M2M) communications and communications networks more broadly.

Together with industry partners, QuintessenceLabs, I am designing 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 technology could be used to protect.

Biomedical technologies

The aim of physiotherapy exercises for a stroke patient is to shift brain function from the ‘dead’ part of the brain to another area, thus allowing the patient to regain lost brain function. The standard level of physiotherapy treatment recommended for a stroke patient is a minimum of 1 hour of active practice per day However, due to limited access, the typical level of treatment patients actually receive is significantly less than this. As a result, their recovery is often compromised. 

Collaborating with colleagues from biomedical sciences, neuroscience and rehabilitation, Associate we are applying systems engineering to develop a sensor enhanced motor learning approach to augment physiotherapy treatment and improve rehabilitation outcomes for stroke patients. The project aims to support patients to optimize their physiotherapy exercises without expert supervision and in a non-clinical environment, such as their own home. 

Firstly, a visual model of the ideal movements for each exercise is modelled through readings from a movement tracking suit, which uses gyroscopes that track range motion (the suit is worn by a physiotherapist who demonstrates the exercises). This expert model is then incorporated into software that the patient can use in their home. The patient then does their exercises whilst wearing a movement tracking suit and the software provides real-time guided feedback on how to adjust their actions. The system also records the patient’s performance for review by an expert.

Secondly, non-invasive NIR (near-infrared) imaging is used to shine light on the brain to measure activity in different areas. As a particular part of brain becomes active blood flow increases oxygen levels. Because the oxygenated areas reflect and refract the light differently, the infrared image can show which areas of the brain are active. If the infrared imaging is captured during the physiotherapy exercises, feedback can be provided on which movements are working to stimulate brain function. 

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
080401 Coding and Information Theory 70
090609 Signal Processing 30

Professional Experience

UON Appointment

Title Organisation / Department
Associate Professor University of Newcastle
School of Electrical Engineering and Computing
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
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 - 24
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 - 80Web of Science - 66
Co-authors Steven Weller
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 - 94
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 - 49Web of Science - 44
Co-authors Lawrence Ong, Chris Kellett
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 - 50Web of Science - 48
Co-authors Lawrence Ong, Chris Kellett
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 - 18Web of Science - 13
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 - 6Web of Science - 5
Co-authors Rohan Walker
2016 Shirvanimoghaddam M, Johnson S, 'Raptor Codes in the Low SNR Regime', IEEE Transactions on Communications, 64 4449-4460 (2016) [C1]
DOI 10.1109/TCOMM.2016.2606410
Citations Scopus - 2Web of Science - 2
Co-authors Mahyar Shirvanimoghaddam
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), Barcelona, Spain (2016) [E1]
Citations Scopus - 1
Co-authors Mahyar Shirvanimoghaddam
2016 Shirvanimoghaddam M, Johnson S, 'Raptor Codes in the Low SNR Regime', IEEE Transactions on Communications, 64 4449-4460 (2016) [C1]
DOI 10.1109/TCOMM.2016.2606410
Co-authors Mahyar Shirvanimoghaddam
2017 Thapa C, Ong L, Johnson SJ, 'Interlinked Cycles for Index Coding: Generalizing Cycles and Cliques', IEEE TRANSACTIONS ON INFORMATION THEORY, 63 3692-3711 (2017) [C1]
DOI 10.1109/TIT.2017.2662706
Citations Scopus - 1Web of Science - 1
Co-authors Lawrence Ong
2017 Shirvanimoghaddam M, Dohler M, Johnson SJ, 'Massive Non-Orthogonal Multiple Access for Cellular IoT: Potentials and Limitations', IEEE COMMUNICATIONS MAGAZINE, 55 55-61 (2017) [C1]
DOI 10.1109/MCOM.2017.1600618
Co-authors Mahyar Shirvanimoghaddam
2017 Shirvanimoghaddam M, Dohler M, Johnson S, 'Massive Multiple Access Based on Superposition Raptor Codes for M2M Communications', IEEE Transactions on Wireless Communications, 16 (2017) [C1]
DOI 10.1109/TWC.2016.2623305
Citations Scopus - 4Web of Science - 4
Co-authors Mahyar Shirvanimoghaddam
2017 Turley JA, Zalewska K, Nilsson M, Walker FR, Johnson SJ, 'An analysis of signal processing algorithm performance for cortical intrinsic optical signal imaging and strategies for algorithm selection', SCIENTIFIC REPORTS, 7 (2017) [C1]
DOI 10.1038/s41598-017-06864-y
Co-authors Michael Nilsson, 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 - 94

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 (49 outputs)

Year Citation Altmetrics Link
2017 Asadi B, Ong L, Johnson SJ, 'The DoF Region of the Three-Receiver Gaussian MIMO Broadcast Channel With Receiver Message Side Information', IEEE TRANSACTIONS ON COMMUNICATIONS, 65 2000-2010 (2017) [C1]
DOI 10.1109/TCOMM.2017.2667660
Co-authors Behzad Asadi, Lawrence Ong
2017 Jayasooriya S, Shirvanimoghaddam M, Ong L, Johnson SJ, 'Joint optimisation technique for multi-edge type low-density parity-check codes', IET COMMUNICATIONS, 11 61-68 (2017) [C1]
DOI 10.1049/iet-com.2016.0287
Co-authors Sachini Jayasooriya, Lawrence Ong, Mahyar Shirvanimoghaddam
2017 Jayasooriya, Shirvanimoghaddam, Ong L, Johnson SJ, 'Raptor Codes for Higher-Order Modulation Using a Multi-Edge Framework', IEEE Wireless Communications Letters, (2017)
DOI 10.1109/LWC.2017.2757482
Co-authors Sachini Jayasooriya, Lawrence Ong, Mahyar Shirvanimoghaddam
2017 Shirvanimoghaddam M, Condoluci M, Dohler M, Johnson SJ, 'On the Fundamental Limits of Random Non-Orthogonal Multiple Access in Cellular Massive IoT', IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, 35 2238-2252 (2017) [C1]
DOI 10.1109/JSAC.2017.2724442
Co-authors Mahyar Shirvanimoghaddam
2017 Asadi B, Ong L, Johnson SJ, 'Leveraging Receiver Message Side Information in Two-Receiver Broadcast Channels: A General Approach', ENTROPY, 19 (2017) [C1]
DOI 10.3390/e19040138
Co-authors Lawrence Ong, Behzad Asadi
2017 Johnson SJ, Lance AM, Ong L, Shirvanimoghaddam M, Ralph TC, Symul T, '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, 19 (2017) [C1]
DOI 10.1088/1367-2630/aa54d7
Co-authors Lawrence Ong, Mahyar Shirvanimoghaddam
2017 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, Behavior, and Immunity, 60 117-125 (2017) [C1]

© 2016 Elsevier Inc. Exposure to psychological stress is known to seriously disrupt the operation of the substantia nigra (SN) and may in fact initiate the loss of dopaminergic n... [more]

© 2016 Elsevier Inc. Exposure to psychological stress is known to seriously disrupt the operation of the substantia nigra (SN) and may in fact initiate the loss of dopaminergic neurons within the SN. In this study, we aimed to investigate how chronic stress modified the SN in adult male mice. Using a paradigm of repeated restraint stress (an average of 20¿h per week for 6¿weeks), we examined changes within the SN using western blotting and immunohistochemistry. We demonstrated that chronic stress was associated with a clear loss of dopaminergic neurons within the SN. The loss of dopaminergic neurons was accompanied by higher levels of oxidative stress damage, indexed by levels of protein carbonylation and strong suppression of both microglial and astrocytic responses. In addition, we demonstrated for the first time, that chronic stress alone enhanced the aggregation of a-synuclein into the insoluble protein fraction. These results indicate that chronic stress triggered loss of dopaminergic neurons by increasing oxidative stress, suppressing glial neuroprotective functions and enhancing the aggregation of the neurotoxic protein, a-synuclein. Collectively, these results reinforce the negative effects of chronic stress on the viability of dopaminergic cells within the SN.

DOI 10.1016/j.bbi.2016.10.001
Citations Scopus - 3Web of Science - 3
Co-authors Phil Dickson, Linkooi Ong, Michael Nilsson, Rohan Walker
2017 Thapa C, Ong L, Johnson SJ, 'Interlinked Cycles for Index Coding: Generalizing Cycles and Cliques', IEEE TRANSACTIONS ON INFORMATION THEORY, 63 3692-3711 (2017) [C1]
DOI 10.1109/TIT.2017.2662706
Citations Scopus - 1Web of Science - 1
Co-authors Lawrence Ong
2017 Shirvanimoghaddam M, Dohler M, Johnson SJ, 'Massive Non-Orthogonal Multiple Access for Cellular IoT: Potentials and Limitations', IEEE COMMUNICATIONS MAGAZINE, 55 55-61 (2017) [C1]
DOI 10.1109/MCOM.2017.1600618
Co-authors Mahyar Shirvanimoghaddam
2017 Shirvanimoghaddam M, Dohler M, Johnson S, 'Massive Multiple Access Based on Superposition Raptor Codes for M2M Communications', IEEE Transactions on Wireless Communications, 16 (2017) [C1]
DOI 10.1109/TWC.2016.2623305
Citations Scopus - 4Web of Science - 4
Co-authors Mahyar Shirvanimoghaddam
2017 Zhao Z, Ong LK, Johnson S, Nilsson M, Walker FR, 'Chronic stress induced disruption of the peri-infarct neurovascular unit following experimentally induced photothrombotic stroke.', Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism, 37 3709-3724 (2017) [C1]
DOI 10.1177/0271678x17696100
Co-authors Linkooi Ong, Rohan Walker, Michael Nilsson
2017 Zalewska K, Pietrogrande G, Ong LK, Abdolhoseini M, Kluge M, Johnson SJ, et al., 'Sustained administration of corticosterone at stress-like levels after stroke suppressed glial reactivity at sites of thalamic secondary neurodegeneration.', Brain Behav Immun, (2017)
DOI 10.1016/j.bbi.2017.11.014
Co-authors Linkooi Ong, Rohan Walker, Michael Nilsson, Mahmoud Abdolhoseini Uon
2017 Turley JA, Zalewska K, Nilsson M, Walker FR, Johnson SJ, 'An analysis of signal processing algorithm performance for cortical intrinsic optical signal imaging and strategies for algorithm selection', SCIENTIFIC REPORTS, 7 (2017) [C1]
DOI 10.1038/s41598-017-06864-y
Co-authors Michael Nilsson, Rohan Walker
2017 Zalewska K, Ong LK, Johnson SJ, Nilsson M, Walker FR, 'Oral administration of corticosterone at stress-like levels drives microglial but not vascular disturbances post-stroke', Neuroscience, 352 30-38 (2017) [C1]

© 2017 IBRO Exposure to chronic stress following stroke has been shown, both clinically and pre-clinically, to impact negatively on the recovery process. While this phenomenon is... [more]

© 2017 IBRO Exposure to chronic stress following stroke has been shown, both clinically and pre-clinically, to impact negatively on the recovery process. While this phenomenon is well established, the specific mechanisms involved have remained largely unexplored. One obvious signaling pathway through which chronic stress may impact on the recovery process is via corticosterone, and its effe cts on microglial activity and vascular remodeling. In the current study, we were interested in examining how orally delivered corticosterone at a stress-like concentration impacted on microglial activity and vascular remodeling after stroke. We identified that corticosterone administration for two weeks following stroke significantly increased tissue loss and decreased the weight of the spleen and thymus. We also identified that corticosterone administration significantly altered the expression of the key microglial complement receptor, CD11b after stroke. Corticosterone administration did not alter the expression of the vessel basement membrane protein, Collagen IV after stroke. Together, these results suggest that corticosterone is likely to represent only one of the major stress signals responsible for driving the negative impacts of chronic stress on recovery.

DOI 10.1016/j.neuroscience.2017.03.005
Citations Scopus - 1
Co-authors Michael Nilsson, Linkooi Ong, Rohan Walker
2017 Kluge MG, Kracht L, Abdolhoseini M, Ong LK, Johnson SJ, Nilsson M, Walker FR, 'Impaired microglia process dynamics post-stroke are specific to sites of secondary neurodegeneration', GLIA, 65 1885-1899 (2017) [C1]

© 2017 Wiley Periodicals, Inc. Stroke induces tissue death both at the site of infarction and at secondary sites connected to the primary infarction. This latter process has been... [more]

© 2017 Wiley Periodicals, Inc. Stroke induces tissue death both at the site of infarction and at secondary sites connected to the primary infarction. This latter process has been referred to as secondary neurodegeneration (SND). Using predominantly fixed tissue analyses, microglia have been implicated in regulating the initial response at both damage sites post-stroke. In this study, we used acute slice based multiphoton imaging, to investigate microglia dynamic process movement in mice 14 days after a photothrombotic stroke. We evaluated the baseline motility and process responses to locally induced laser damage in both the peri-infarct (PI) territory and the ipsilateral thalamus, a major site of post-stroke SND. Our findings show that microglia process extension toward laser damage within the thalamus is lost, yet remains robustly intact within the PI territory. However, microglia at both sites displayed an activated morphology and elevated levels of commonly used activation markers (CD68, CD11b), indicating that the standardly used fixed tissue metrics of microglial ¿activity¿ are not necessarily predictive of microglia function. Analysis of the purinergic P 2 Y 12 receptor, a key regulator of microglia process extension, revealed an increased somal localization on nonresponsive microglia in the thalamus. To our knowledge, this is the first study to identify a non-responsive microglia phenotype specific to areas of SND post-stroke, which cannot be identified by the classical assessment of microglia activation but rather the localization of P 2 Y 12 to the soma.

DOI 10.1002/glia.23201
Co-authors Rohan Walker, Linkooi Ong, Michael Nilsson, Mahmoud Abdolhoseini Uon
2016 Jayasooriya S, Shirvanimoghaddam M, Ong L, Lechner G, Johnson S, 'New Density Evolution Approximation for LDPC and Multi-Edge Type LDPC Codes', IEEE Transactions on Communications, 64 4044-4056 (2016) [C1]
DOI 10.1109/TCOMM.2016.2600660
Co-authors Lawrence Ong, Sachini Jayasooriya, Mahyar Shirvanimoghaddam
2016 Shirvanimoghaddam M, Johnson S, 'Raptor Codes in the Low SNR Regime', IEEE Transactions on Communications, 64 4449-4460 (2016) [C1]
DOI 10.1109/TCOMM.2016.2606410
Citations Scopus - 2Web of Science - 2
Co-authors Mahyar Shirvanimoghaddam
2016 Shirvanimoghaddam M, Johnson S, 'Raptor Codes in the Low SNR Regime', IEEE Transactions on Communications, 64 4449-4460 (2016) [C1]
DOI 10.1109/TCOMM.2016.2606410
Co-authors Mahyar Shirvanimoghaddam
2016 Shirvanimoghaddam M, Johnson SJ, 'Multiple Access Technologies for Cellular M2M Communications', ZTE COMMUNICATIONS, 14 42-49 (2016) [C1]
DOI 10.3969/j
Co-authors Mahyar Shirvanimoghaddam
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 - 6Web of Science - 5
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 disr... [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 - 6Web of Science - 5
Co-authors Michael Nilsson, Brett Graham, 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
Citations Scopus - 1Web of Science - 1
Co-authors Behzad Asadi, 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 - 5Web of Science - 7
Co-authors Rohan Walker, Michael Nilsson
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 - 12Web of Science - 10
Co-authors Rohan Walker, Michael Nilsson, Neil Spratt
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 - 8Web of Science - 7
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 - 3Web of Science - 3
Co-authors Lawrence Ong, Behzad Asadi
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 Scopus - 15Web of Science - 15
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 - 3Web of Science - 2
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 - 2Web of Science - 6
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 - 41Web of Science - 40
Co-authors Michael Nilsson, Rohan Walker, Madeleine Hinwood
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 - 4Web 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 - 18Web of Science - 13
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 - 31Web of Science - 29
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 - 13Web of Science - 10
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 Lawrence Ong, Chris Kellett
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 - 50Web of Science - 48
Co-authors Lawrence Ong, Chris Kellett
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 Lawrence Ong, Chris Kellett
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 - 49Web of Science - 44
Co-authors Lawrence Ong, Chris Kellett
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 - 15Web of Science - 9
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 - 6Web 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 - 12Web of Science - 10
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 - 16Web of Science - 9
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 - 34Web of Science - 28
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 - 24
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 - 80Web of Science - 66
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 - 15Web of Science - 12
Co-authors Steven Weller
Show 46 more journal articles

Conference (50 outputs)

Year Citation Altmetrics Link
2017 Pietrogrande G, Mabotuwana N, Zhao Z, Abdolhoseini M, Johnson SJ, Nilsson M, Walker FR, 'Chronic stress induced disturbances in Laminin: A significant contributor to modulating microglial pro-inflammatory tone?', Brain, behavior, and immunity (2017)
DOI 10.1016/j.bbi.2017.09.012
Co-authors Mahmoud Abdolhoseini Uon, Michael Nilsson, Rohan Walker
2017 Pietrogrande G, Mabotuwana N, Zhao Z, Mahmoud A, Johnson SJ, Zalewska K, et al., 'Chronic stress induced disturbances in Laminin: a significant contributor to modulating microglial pro-inflammatory tone?', GLIA, Edinburgh, SCOTLAND (2017)
Co-authors Michael Nilsson, Rohan Walker
2017 Li M, Ong L, Johnson SJ, 'Improved Bounds for Multi-Sender Index Coding', 2017 IEEE International Symposium on Information Theory, Aachen, Germany (2017) [E1]
DOI 10.1109/ISIT.2017.8007092
Co-authors Lawrence Ong, Min Li
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', 2016 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY, Barcelona, SPAIN (2016) [E1]
Co-authors Lawrence Ong, Behzad Asadi
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 SJ, Lance AM, 'Design of Raptor Codes in the Low SNR Regime with Applications in Quantum Key Distribution', IEEE ICC 2016 - Communications Theory, Kuala Lumpur (2016) [E1]
Co-authors Mahyar Shirvanimoghaddam
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), Barcelona, Spain (2016) [E1]
Citations Scopus - 1
Co-authors Mahyar Shirvanimoghaddam
2016 Thapa C, Ong L, Johnson SJ, 'Graph-theoretic approaches to two-sender index coding', 2016 IEEE Globecom Workshops, GC Wkshps 2016 - Proceedings, Washington, DC (2016) [E1]
DOI 10.1109/GLOCOMW.2016.7848917
Co-authors Lawrence Ong
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, Florida USA (2016) [E1]
DOI 10.1109/EMBC.2016.7590922
Co-authors Rohan Walker, Mahmoud Abdolhoseini Uon
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 probl... [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
Citations Scopus - 3Web of Science - 1
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, Bilbao, SPAIN (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 te... [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
Citations Scopus - 2Web of Science - 1
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 dire... [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 - 2
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 ... [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 - 3Web of Science - 2
Co-authors Lawrence Ong, Behzad Asadi
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 - 2Web of Science - 1
Co-authors Lawrence Ong, Chris Kellett
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 - 9Web of Science - 7
Co-authors Behzad Asadi, 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), Hobart, Australia (2014) [E1]
DOI 10.1109/ITW.2014.6970896
Citations Scopus - 2
Co-authors Behzad Asadi, 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, Hobart, Tas (2014) [E1]
DOI 10.1109/ITW.2014.6970873
Citations Scopus - 2
Co-authors Sachini Jayasooriya, 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), Melbourne (2014) [E1]
2012 Lechner G, Johnson SJ, 'Absorbing sets and cycles', 2012 7th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2012, Gothenburg, Sweden (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), Cambridge, Massachusetts (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), Boston, Massachusetts (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), St. Petersburg, Russia (2011) [E1]
DOI 10.1109/ISIT.2011.6034256
Citations Scopus - 3Web of Science - 1
Co-authors Lawrence Ong, Chris Kellett
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), St. Petersburg, Russia (2011) [E1]
Citations Scopus - 3
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), Austin, TX (2010) [E1]
DOI 10.1109/ISIT.2010.5513571
Citations Scopus - 1
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), Austin, TX (2010) [E1]
DOI 10.1109/ISIT.2010.5513576
Citations Scopus - 39Web of Science - 28
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), Singapore (2010) [E1]
DOI 10.1109/ICCS.2010.5686491
Citations Scopus - 2
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), Singapore (2010) [E1]
DOI 10.1109/ICCS.2010.5686490
Citations Scopus - 5
Co-authors Chris Kellett, Lawrence Ong
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, Dublin, IRELAND (2010) [E1]
DOI 10.1109/CIG.2010.5592734
Citations Scopus - 1
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), Seoul, Korea (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), Taormina, Sicily (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, Christchurch, NEW ZEALAND (2007)
Citations Scopus - 2
Co-authors Chris Kellett
2007 Chiera B, Hong Y, Letzepis N, Rasmussen L, Rasmussen LK, Woodward G, et al., 'Welcome: Message from the technical programme committee', 8th Australian Communication Theory Workshop, AusCTW 2007 (2007)
Co-authors Steven Weller
2006 Johnson SJ, Weller SR, 'Practical Interleavers for Systematic Repeat-Accumulate Codes', 2006 IEEE 63rd Vehicular Technology Conference, Melbourne, VIC, Australia (2006) [E1]
Citations Scopus - 10
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, Vienna, Austria (2006) [E1]
2006 Hanlen LW, Johnson SJ, Teal PD, 'Proceedings 7th Australian Communications Theory Workshop 2006', Proceedings 7th Australian Communications Theory Workshop 2006, Perth, Australia (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, Brisbane, Australia (2005) [E1]
Citations Scopus - 7Web of Science - 3
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, Perth, Australia (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, Adelaide, S. Aust (2005) [E1]
Citations Scopus - 11
Co-authors Steven Weller
2004 Sadeghi P, Rapajic PB, Johnson SJ, 'Numerical capacity analysis of time varying fading channels using finite state Markov models', IEEE International Symposium on Information Theory - Proceedings (2004)

We investigate the effect of channel gain quantization on the information capacity of unknown time varying flat fading channels. The phase and/or amplitude of the flat fading chan... [more]

We investigate the effect of channel gain quantization on the information capacity of unknown time varying flat fading channels. The phase and/or amplitude of the flat fading channel gain is modelled as a finite state Markov (FSM) process and the information capacity of the FSM channel is calculated numerically as a measure for choosing the number of channel quantization levels, as well as quantization thresholds. The results indicate that for binary signalling, the capacity is saturated beyond 8 to 16 levels of phase and 8 to 16 levels of amplitude quantization.

2004 Johnson SJ, Weller SR, 'Structured low-density parity-check codes over non-binary fields', Proceedings of the 5th Australian Communication Theory Workshop 2004, Brisbane (2004) [E1]
Co-authors Steven Weller
2003 Johnson SJ, Weller SR, 'High-Rate LDPC Codes from Unital Designs', Proceedings for GLOBECOM 2003, San Francisco, USA (2003) [E1]
Citations Scopus - 10Web 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, Melbourne (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, University of Melbourne (2003) [E1]
Co-authors Steven Weller
2002 Johnson SJ, Weller SR, 'Codes for Iterative Decoding from Partial Geometries', International Symposium on Information Theory 2002, Switzerland (2002) [E1]
Citations Scopus - 11Web 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, Canberra, Australia (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, San Antonio, Texas, USA (2001) [E1]
Citations Scopus - 31Web 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, Cairns, Australia (2001)
Citations Scopus - 55Web of Science - 45
Co-authors Steven Weller
Show 47 more conferences
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Grants and Funding

Summary

Number of grants 31
Total funding $4,973,446

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


Highlighted grants and funding

Communications strategies for the internet of things$433,122

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson, Dr Mahyar Shirvanimoghaddam, Gianluigi Liva, Professor Mischa Dohler
Scheme Discovery Projects
Role Lead
Funding Start 2018
Funding Finish 2020
GNo G1601547
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

New strategies to transmit data: Coping with exponential growth in demand$367,556

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$667,422

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

20181 grants / $433,122

Communications strategies for the internet of things$433,122

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Associate Professor Sarah Johnson, Dr Mahyar Shirvanimoghaddam, Gianluigi Liva, Professor Mischa Dohler
Scheme Discovery Projects
Role Lead
Funding Start 2018
Funding Finish 2020
GNo G1601547
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

20178 grants / $779,585

Subproject:HMRI MRSP Infrastructure (17) Brain and Mental Health - PRC for Stroke and Brain Injury$356,551

Funding body: Hunter Medical Research Institute

Funding body Hunter Medical Research Institute
Project Team Professor Neil Spratt, Professor Mark Parsons, Professor Michael Nilsson, Associate Professor Rohan Walker, Associate Professor Sarah Johnson, Doctor Andrew Bivard, Doctor Andrew Gardner, Conjoint Professor Chris Levi, Doctor Coralie English, Associate Professor Frini Karayanidis, Aprof JANE Maguire
Scheme NSW MRSP Infrastructure Grant
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo GS170009
Type Of Funding Other Public Sector - State
Category 2OPS
UON Y

HunterWiSE: Hunter Women in STEM and Entrepreneurship$30,000

Funding body: Muswellbrook Shire Council

Funding body Muswellbrook Shire Council
Project Team Doctor Elena Prieto-Rodriguez, Doctor Karen Blackmore, Doctor Anna Giacomini, Associate Professor Sarah Johnson, Professor Regina Berretta, Professor Erica Wanless, Associate Professor Juanita Todd
Scheme Research Grant
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1700965
Type Of Funding Other Public Sector - Local
Category 2OPL
UON Y

HunterWiSE: Hunter Women in STEM and Entrepreneurship$15,000

Funding body: Hunter Water Corporation

Funding body Hunter Water Corporation
Project Team Doctor Elena Prieto-Rodriguez, Doctor Karen Blackmore, Doctor Anna Giacomini, Associate Professor Sarah Johnson, Professor Regina Berretta, Professor Erica Wanless, Associate Professor Juanita Todd
Scheme Research Grant
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1700961
Type Of Funding Donation - Aust Non Government
Category 3AFD
UON Y

HunterWiSE: Hunter Women in STEM and Entrepreneurship$15,000

Funding body: Glencore Coal Assets Australia Pty Ltd

Funding body Glencore Coal Assets Australia Pty Ltd
Project Team Doctor Elena Prieto-Rodriguez, Doctor Karen Blackmore, Doctor Anna Giacomini, Associate Professor Sarah Johnson, Professor Regina Berretta, Professor Erica Wanless, Associate Professor Juanita Todd
Scheme Research Grant
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1700962
Type Of Funding Donation - Aust Non Government
Category 3AFD
UON Y

HunterWiSE: Hunter Women in STEM and Entrepreneurship$15,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Elena Prieto-Rodriguez, Doctor Karen Blackmore, Doctor Anna Giacomini, Associate Professor Sarah Johnson, Professor Regina Berretta, Professor Erica Wanless, Associate Professor Juanita Todd
Scheme Special Project Grant
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1700963
Type Of Funding Internal
Category INTE
UON Y

Development of Automated Multidimensional Biometric Assessment Platform for Virtual Reality and Simulation Based Training$10,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Associate Professor Rohan Walker, Associate Professor Eugene Nalivaiko, Associate Professor Sarah Johnson
Scheme Linkage Pilot Research Grant
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1701118
Type Of Funding Internal
Category INTE
UON Y

Ultra-Low latency communication Strategies for Machine-to-Machine Communications$6,200

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Associate Professor Sarah Johnson, Dr Mahyar Shirvanimoghaddam
Scheme Australia-Germany Joint Research Cooperation Scheme
Role Lead
Funding Start 2017
Funding Finish 2017
GNo G1600925
Type Of Funding Internal
Category INTE
UON Y

20162 grants / $355,297

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 Professor Neil Spratt, Professor Mark Parsons, Associate Professor Rohan Walker, Doctor Coralie English, Professor Michael Nilsson, Conjoint Professor Chris Levi, Doctor Andrew Bivard, Aprof 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

Imagent system$30,000

Funding body: NHMRC (National Health & Medical Research Council)

Funding body NHMRC (National Health & Medical Research Council)
Project Team Associate Professor Juanita Todd, Associate Professor Rohan Walker, Associate Professor Frini Karayanidis, Associate Professor Sarah Johnson
Scheme Equipment Grant
Role Investigator
Funding Start 2016
Funding Finish 2016
GNo G1601309
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON Y

20152 grants / $387,556

New strategies to transmit data: Coping with exponential growth in demand$367,556

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 Associate Professor Rohan 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

20141 grants / $20,000

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

20135 grants / $446,558

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

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 2013
Funding Finish 2016
GNo G1201271
Type Of Funding Grant - Aust Non Government
Category 3AFG
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 / $667,422

New high-performance iterative error correction codes$667,422

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

Completed4
Current5

Total current UON EFTSL

Masters0.6
PhD1.7

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2017 Masters Cache-aided Noisy Channels: Optimisation and Security M Philosophy(Elec Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2017 PhD Functional Connectivity in Near-Infrared Spectroscopy PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
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 An Analysis of Signal Processing Techniques for Intrinsic Optical Signal Brain Imaging 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

Past Supervision

Year Level of Study Research Title Program Supervisor Type
2017 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
2017 PhD Broadcast Channels with Receiver Message Side Information PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2017 PhD Multi-Edge Type Density Evolution: Analysis, Code Optimization and Applications to Raptor Code Design PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
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 91
United Kingdom 6
New Zealand 4
Sweden 2
Singapore 2
More...
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News

STEM pilot program a great success

November 23, 2017

The HunterWiSE 2017 Pilot Program culminated in a final presentation on Wednesday the 1st of November.

State leaders in science and engineering announced

October 23, 2017

Two outstanding University of Newcastle (UON) researchers have been named recipients of the prestigious 2017 Premier’s Prizes for Science and Engineering, announced today at a reception held at Sydney’s Government House.

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

Associate Professor
School of Electrical Engineering and Computing
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 Building
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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