RESEARCH REPORT 2002 and 2003 SCHOOL OF ELECTRICAL ...

12502 Cover MAC.qxd 16/07/2004 07:13 AM Page 1 

SCHOOL OF ELECTRICAL 

AND INFORMATION ENGINEERING 

THE UNIVERSITY OF SYDNEY 

RESEARCH REPORT 2002 and 2003

12502 Cover MAC.qxd 27/07/2004 08:04 AM Page 2 

www.ee.usyd.edu.au 

Contents 

Message from the Head of School 1 

Computer Engineering Laboratory 3 

Systems and Control Laboratory 7 

Image Science and Engineering Laboratory 9 

Industrial Modelling and Sensing Technologies Laboratory 12 

Fibre-optics and Photonics Laboratory 15 

Telecommunications Laboratory 20 

School of Electrical 

and Information Engineering 

The University of Sydney 

Postal Address: School of Electrical and Information Engineering, Building J03, University of Sydney, NSW 2006, Australia 

Telephone: +61 2 9351 3229 Facsimile: +61 2 9351 3847 Website: www.ee.usyd.edu.au

12502 Text Pages for Final PDF.qxd 7/7/2004 4:43 PM Page 1 

Message from the Head of School 

Research in the School of EIE is undertaken by outstanding 

research groups working within the themes of: 

Computer Engineering 

Control and Power Engineering 

Imaging Science and Engineering 

Industrial Modelling and Sensing 

Photonics and Optical Communications 

Telecommunications 

The School of EIE has enjoyed a particularly successful year on several fronts. In 2003, Prof. 

Robert Minasian and Prof. Branka Vucetic were elected Fellows of IEEE, in recognition to their 

outstanding research contributions. WTi's WeldPrint, a spin-off company marketing Steve 

Simpson’s novel signal processing technology, won the inaugural Peter Doherty Prize, for the 

nation's premier research commercialization opportunity. Two textbooks in telecommunications, 

authored by Prof Branka Vucetic and A/Prof Abbas Jamalipour were published by John Wiley. 

Some of our research highlights include: 

Four new ARC Discovery Grants and a new ARC Linkage International Grant 

Major grants from CRC’s: Australian Photonics CRC, Welded Structures CRC, 

Technology Enabled Capital Markets CRC 

Defence Advanced Research Program (DARPA) contract 

Eight new Sesqui Grants and a Major Equipment Grant 

VAST Audio, a University of Sydney bio-tech spin-off company won the Best Operations 

Plan and Best Overall Business Plan from the NSW Enterprise Workshop (winter, 2003), 

and has also been awarded from AUSIndustry a Biotechnology Innovation Fund (Round 5) 

grant of $244K. 

Polarizone Technology funded research on cross-polarization interference cancellation 

DEST funded research on advanced wireless communication networks and access 

technologies 

Industry contracts with Australian Photonics Pty Ltd, Crux Cybernetics Pty Ltd, eNose Pty 

Ltd 

ARC SPIRT grant with SingTel Optus 

Industry projects with BP-Solarex, a solar cell manufacturer, integrating their CADA and 

ERP systems, SMI Pty Ltd, e-business systems; and e-Nose Pty Ltd, an electronic sniffer 

for detection of wastewater contamination and odour management in meat processing 

plants 

The Electronic Commerce Science Lectureship initiative has involved extensive 

collaboration with Industry, with IBM, Microsoft, Optus, Nortel, Deutsche Bank, 

Printing.com, Baker McKenzie, Macquarie Bank, iNETStore, OpenTec, Packet Storm and 

other companies. 

This year, I look forward to greater research activities to harvest the value from the significant 

intellectual potential within the School. If you are looking for a partner in your electrical and 

information engineering initiatives, contact Prof. Branka Vucetic, Head of School of EIE at 

hos@ee.usyd.edu.au. We welcome enquiries from companies and individuals. Detailed information 

about the School can be found at www.ee.usyd.edu.au. 

Branka Vucetic 

Professor and Head of School 

1


2


Computer Engineering Laboratory 

A/Prof. David Levy Dr Andre van Schaik Dr. Richard Coggins Dr. Rafael Calvo Dr. Craig Jin 

Head of Group Reader Senior Lecturer Lecturer Lecturer 

The Computer Engineering Laboratory (CEL) specializes in all aspects of computer and software 

engineering, with applications including real-time and distributed systems, language engineering, 

intelligent sensors and e-learning. The laboratory is also active in middleware, web engineering and 

services, neuromorphic engineering, neural computing and genetic algorithms. 

An important activity of the laboratory is that of sharpening its computer systems engineering skills 

through basic research and collaborative research and development projects aiming at producing 

innovative solutions to industrial problems. 

The CEL comprised the subgroups Computing and Audio Research (CARLab), Components, 

Architecture and Middleware (CAM), Web Engineering (WEG). 

CARLab’s research interests focus on Analogue IC Design, Neuromorphic Engineering, Smart 

Sensory Systems, Human Computer Interfaces, Virtual and Augmented Reality, Virtual Auditory 

Spaces, Human Sound Localisation and the generation of an immersive Audio-Visual 

Environment. 

CAM focuses on Architecture and Performance of Real-Time Frameworks and Middleware, 

Architectural Analysis and Performance Prediction of Real-Time and Middleware-based Systems, 

Fault-tolerant distributed systems and Consistency in Loosely Coupled Distributed Systems. 

WEG focuses on the technologies and skills for the Engineering of Web-based applications, 

Language Engineering and Data Mining. WEG has several projects with the Capital Markets CRC 

investigating, inter alia, announcement classification and automated trading. 

CEL has significant research funding from competitive grants schemes such as the Australian 

Research Council, the Capital markets CRC, the Australian Academy of Science, and industrial 

contracts. It is also involved in close collaboration with industry, both in Australia and 

internationally and with the CSIRO. The current industry funding supports a number of projects 

within the group. Research collaborations are also maintained with a number of international 

research groups, including the Media Lab and Sloan School of Management at MIT and at CMU. 

During 2002/3 we had five academic staff, two research and technical staff and at the end of 2003, 

32 postgraduate students. 

3


Research Projects 

Real-time performance prediction with UML 

Researchers: A/Prof. D C Levy 

In this project we concentrated on the development of 

tools for predicting the performance of real-time systems 

designed with real-time UML tools, using the UML 

Profile for Schedulability, Performance and Time. 

Intelligent Learning management Systems 

Researchers: Dr. Rafael A. Calvo 

ILMS are the future e-learning infrastructure: systems that 

manage large amounts of content and students’ 

interactions by using data mining and language 

engineering techniques. This project has received funding 

from Sloan School of Management at MIT. 

GainSpring 


This project aims to improve the way financial institutions 

exploit the value of corporate announcements and other 

financial text-based information. We are developing 

information extraction and summarization techninques 

novel web interfaces together with Macquarie University. 

The project has received over $150k from the Capital 

Markets CRC in addition to the $44k for projects finished 

in 2002 and 2003. 

Scalable Document Classification 


We are performing basic research on algorithms for 

processing, storing and automatically classifying large 

amounts of text. In 2003 Prof Lee (Hansung University, 

Korea) visited WEG as part of our ongoing collaboration. 

We have received funding from the Australian research 

Council, the Australian Academy of Science and the 

University of Sydney. 

Staff 

Academic Staff 

A/Prof. David Levy 

Dr. A van Schaik 

Dr. R Coggins 

Dr. Rafael Calvo 

Dr Craig Jin 

Technical Staff 

William Fong 

Michael Zhou 

Administrative Staff 

Colleen Moore 

Malgorzata Mendrela 

Postgraduate Students 

Hisako Shiraishi 

Stephen Kim 

Bing Du 

Bryan Lee 

David Peterson 

David Zhong 

Dongxi Jin 

Jeff Zou 

Kanut Tangtisanon 

Matt Kyan 

Sena Seneviratne 

Xiao Xing Wang 

Yiding Wen 

Yu-Chu (Glen) Tian 

Peter Stepien 

Adam Blazejewski 

Eric Wang 

Kevin Lo 

Marcus Lim 

Victor Weidong Zhou 

Jang Loh 

Alan Kan 

Manurajh Thurairajah 

Gary Lazarus 

Winston Wu 

Ernie Guglione 

Ken Williams 

Nicholas Carroll 

Xiaobo Li 

Research Funding 

A. van Schaik, “Dynamic signal 

processing with currents” , ARC 

fellowship linkage grant, A$305,793, 

2003-2007. 

C. T. Jin, A. van Schaik, “Mobile 

spatial-audio telecommunication 

systems”, ARC discovery, 

A$292,294, 2003-2005. 

A. van Schaik, “Intelligent noiserobust 

interfaces for MEMS acoustic 

sensors”, DARPA projects, 

A$ 198,138, 2001-2003. 

A. van Schaik, “Design and 

Implementation of an on-chip 

cochlear model for cochlear 

implants”, Sydney University Sesqui 

Grant, A$25,000, 2003. 

C. T. Jin, “Recording 3D audio”, 

Sydney University Sesqui Grant, 

A$26,000, 2003. 

R. A. Calvo, “Classification of 

financial announcements a baseline”, 

Capital Markets CRC, A$662, 2002. 

R. A. Calvo and Robert Dale, “Key 

Element Summarisation Using ASX 

Announcements”, Capital Markets 

CRC, A$7,530, 2002. 

D. C. Levy, “Fault Tolerant Systems” 

ARC Linkage, A$15,000, 2003-2005. 

C. T. Jin, “Improving speech 

segregation and intelligibility 

in 

noisy environments for the hearing 

impaired”, ARC Discovery, 2004. 

C. T. Jin, A. van Schaik, “Acoustic 

Filter Functions from Morphological 

Measurements” ARC Linkage 

International, 2004. 

A. van Schaik, R. Reeve “A 

neuromorphic model of sound 

localisation in the cricket”, Institute 

of Neuromorphic Engineering 

International Collaboration Grant, 

2004. 

C. T. Jin, “Broadcasting 3D audio 

over the internet”, Sydney University 

Sesqui Grant, A$20,000 2004. 

4


A. van Schaik, “Design of silicon 

cochlea with Address Event 

Representation communication 

interface (AER EAR)”, Sydney 

University Sesqui Grant, A$22,000, 

2004. 

R. A Calvo, “Clustering aggregates 

of learning machines in classification 

tasks”, Sesqui new staff grant, 

A$10,000, 2004. 

C. T. Jin, “Digital imaging system 

for personalised acoustic filters”, 

Sesqui new staff grant, A$10,000, 2004. 

A. van Schaik, “Spatial audio 

recording and playback system”, 

Sesqui major equipment grant, 

A$88,000, 2004. 

R. A. Calvo, “Efficient data 

manipulation in document 

classification”, ARC Fellowship 

International Linkage, A$59,873, 

2004. 

R. A Calvo, “Announcement 

classification for ASX QA”, 

CMCRC seed grant, A$18,450, 2003. 

R. A. Calvo, “GainSpring”, CMCRC 

grant, A$150,000, 2004. 

R. Coggins, “Planning, pricing and 

on-line optimisation of institutional 

trade execution strategies”, Capital 

Markets CRC project grant, 


R. Coggins, “Optimal execution of 

volume weighted average price 

(VWAP) blocks trades”, Capital 

Markets CRC, A$18,736, 2002. 

R. Coggins, “Liquidity Modelling of 

ASX Equities for Trade Execution”, 

Capital Markets CRC, A$11,000, 

2002. 

R. A. Calvo and R. Coggins, 

“Enabling Price Sensitivity Detection 

Using Reuters Corporate 

Announcements”, Capital Markets 

CRC, A$13,104, 2002. 

R. Coggins, “Software framework for 

modelling of ASX equities for trade 

execution”, Capital Markets CRC, 


Publications 

Books 

D. Rolsky and K. Williams, 

"Embedding Perl in HTML with 

Mason", O'Reilly and Associates, 


Rafael Calvo, “Introduction to e- 

commerce Systems”, Pearson 

Education, 2002. 

Refereed Journal Papers 

A. van Schaik and A. McEwan, "An 

Analogue VLSI Implementation of 

The Meddis Inner Hair Cell Model," 

EURASIP Journal on Applied Signal 

Processing, Special Issue on 

Neuromorphic Signal Processing and 

Applications, Vol. 7, pp 639-648, 


M.P. Leong, C. Jin, and P. Leong, 

"An FPGA-Based Electronic 

Cochlea," EURASIP Journal on 

Applied Signal Processing Special 

Issue on Neuromorphic Signal 

Processing, Vol. 7, pp 629-638, 2003. 

Calvo R.A. and R. Ellis, dotLRN: 

Herramienta de gestion de la 

Ensenanza. Revista IRICE 17, 143- 

50, 2003. 

J J Zou, H Yan and D C Levy, 

“Reducing Artifacts in Block Coded 

Images using Adaptive Constraints”, 

Optical Engineering, Volume 42, 

Issue 10, pp. 2900-2911, Oct 2003. 

Refereed Conference Papers 

K. Lo, R.J. Coggins, "Profitability of 

Contrarian Strategies in the 

Australian Equity Market", the 16th 

Australasian Finance & Banking 

Conference, December 2003. 

A. Blazejewski, R.J. Coggins, "A 

dynamic non-parametric model for 

trade direction forecasting", 

presented at the 16th Australasian 

Finance & Banking Conference, 

December 2003. 

M. Lim, R.J. Coggins, "Price Impact 

of Trades on the ASX", the 16th 

Australasian Finance & Banking 

Conference, December 2003. 

W. Zhou, R.J. Coggins, "Emotionbased 

hierarchical reinforcement 

learning", in the third International 

conference on Hybrid Intelligent 

Systems (HIS'03), December, 2003. 

R.J. Coggins, A. Blazejewski, 

M. Aitken, "Optimal Trade 

Execution of Equities in a Limit 

Order Market", International 

Conference on Computational 

Intelligence for Financial 

Engineering, pp. 371-378, March, 


K. Lo, R.J. Coggins, "Intraday 

Analysis of Portfolios on the ASX 

using ICA" , in Fourth International 

Conference on Intelligent Data 

Engineering and Automated 

Learnin g (IDEAL'03), p p. 934-938, 

March 2003. 

W. Zhou, R.J. Coggins, 

"Computational Models of the 

Amygdala and the Orbitofrontal 

Cortex: A Hierarchical 

Reinforcement Learning System for 

Robotic Control", in Proceedings of 

the 15th Australian Joint Conference 

on Artificial Intelligence, pp. 419- 


C. Jin, V. Best, S. Carlile, T. Baer, 

and B. Moore, "Speech 

Localisation," In Proceedings of the 

112th Convention of the Audio 

Engineering Society, May, 2002. 

S. Carlile, C. Jin, and J. Leung, 

"Performance measures of the spatial 

fidelity of virtual auditory space: 

effects of filter compression and 

spatial sampling," In Proceedings of 

the 8th International Conference on 

Auditory Display, 375-379, July 2-5, 


S. Carlile, C. Jin, and J. Leung, 

"Virtual Auditory Space – Managing 

Perceptual Fidelity and 

Computational Expense," keynote 

presentation at Western Pacific 

Acoustic Conference, April 2003. 

V. Best, S. Carlile, and A. van Schaik, 

"Spatial effects on the segregation of 

sounds in virtual auditory space," 

invited presentation at Western 

Pacific Acoustic Conference, April 


A. van Schaik and Shihab Shamma, 

"A neuromorphic sound localizer for 

a smart MEMS system," Proceedings 

5


of the IEEE International Symposium 

on Circuits and Systems (ISCAS 

2003) May 2003. 

A. van Schaik and Craig Jin, "The 

tau-cell: a new method for the 

implementation of arbitrary 

differential equations," Proceedings 

of the IEEE International Symposium 



A. van Schaik, "A small analog VLSI 

inner hair cell model" Proceedings of 

the IEEE International Symposium 



Jin, V. Best, A. van Schaik, and S. 

Carlile, "Psychoacoustic evaluation 

of a perceptual spatial-audio coding 

technique for speech and noise," 

proceedings 24th AES International 

Conference, June 2003. 

Jin, A. van Schaik, V. Best, and S. 

Carlile, "Perceptual Spatial-Audio 

Coding" proceedings of the 

International Conference on auditory 

displays (ICAD 2003), July 2003. 

V. Best, S. Carlile, and A. van Schaik, 

"Two-point discrimination of speech 

in auditory displays" Proceedings of 

the International Conference on 

auditory displays (ICAD 2003), July 


Jin, A. van Schaik, V. Best, and S. 

Carlile, "Individualization in Spatial- 

Audio Coding" Proceedings of the 

2003 IEEE Workshop on 

Applications of Signal Processing to 

Audio and Acoustics, October 2003. 

Calvo RA, "User Scenarios for the 

Design and Implementation of 

iLMS", in R. Calvo and M. 

Grandbastien (eds), Proceedings of 

the first workshop "Towards 

Intelligent Management Systems", 

Volume IV of the Supplemental 

Proceedings of the 11th International 

Conference on Artificial Intelligence 

in Education, University of Sydney, 

Australia, 2003 

Williams K., R. A. Calvo and D. Bell, 

“Automatic Categorization of 

Questions for a Mathematics 

Education Service”, Proceedings of 

the 11th International Conference on 

Artificial Intelligence in Education, 

University of Sydney, Australia. July 


Calvo RA and Jae-Moon Lee, 

“Coping with the news: the machine 

learning way”, In A. Treloar and A. 

Ellis (Eds). Proceedings of AusWEB, 

pp. 392-399, 2003. 

Calvo RA, E. Ghiglione and R. Ellis , 

“The OpenACS e-learning 

infrastructure”, In A. Treloar and A. 

Ellis (Eds) Proceedings of AusWEB 

Gold Coast Australia. pp. 175-183, 


Williams K. and R.A. Calvo, “A 

Framework for Text Categorization”, 

7th Australasian Document 

Computing Symposium, Sydney, 

Australia. 13-19, 2002. 

D X Jin and D C Levy, "An 

Integrated Object-Oriented 

Methodlogy for Real-Time Software 

Design”, SERP Las Vegas, June 

2002, pp 260-266, 2002. 

D X Jin and D C Levy, "An 

Approach to Performance Analysis 

of UML-based Real-time Systems 

Design", WOSP 2002, Rome, , pp 

243-250, July 2002. 

R A Ellis, D C Levy, et al, 

“Conceptual Integrity in Web- 

Inclusive Curriculum 

Design”, 

AusWeb 2002, Eighth Australian 

World Wide Web Conference, 

Queensland, July 2002, pp 438-445, 


G B Lazarus and D C Levy, 

“ Towards an Open Project 

Management Methodology for the 

Management and Control of Virtual 

Teams”, 7th Australian International 

Performance Management 

Symposium, Canberra, Australia, 19 

- 21 Feb 2003. 

Bing Du, D C Levy, “H robust 

control scheduling design 

methodology in real-time systems”, 

Int Conf on Embedded Sys and App 

(ESA'03), Las Vegas, pp 285-291, 

June 23 - 26, 2003. 

Patents 

J. Leung, C. Jin, S. Carlile, and A. 

van Schaik, "Recording a three 

dimensional auditory scene and 

reproducing it for the listener," 

World Patent Office 03/009639, 

January 30, 2003. 

V. Best, S. Carlile, C. Jin, J. Leung, 

and A. van Schaik, "Individualization 

of Spatial-Audio Recordings Using a 

Perceptual Coding Technique Based 

on High-Frequency Gain 

Equalization," Provisional Patent 

Application AU 2003900498. 

Jin, A. van Schaik, J. Leung, and S. 

Carlile, "An in-the-canal earphone 

for augmenting normal hearing with 

the capability of rendering virtual 

spatial audio concurrently with the 

real sound environment," 

Provisional Patent Applications AU 

2003903414, July 4, 2003. 

Jin, A. van Schaik, J. Leung, and S. 

Carlile, "Enhancement of sound 

externalization and separation for 

hearing-impaired listeners: a spatial 

hearing-aid," Provisional Patent 

Applications AU 2003904207, 

August 11, 2003. 

6


Systems & Control Laboratory 

Prof. David J Hill Dr Hansen Yee Dr. Xiheng Hu Dr. Swamidoss Dr. Yash Shrivastava 

Sathiakumar 

Head of Group Associate Professor Senior Lecturer Senior Lecturer Senior Lecturer 

The Systems and Control group specializes in the modeling, analysis and control of complex 

physical systems. The work ranges from theoretical investigations to applications in close contact 

with companies. Substantial financial support exists from the Australian Research Council (ARC) 

along with companies in the power and biomedical areas. A lot of research carried out by the group 

has been of a multi-disciplinary nature. Recent research has been in the areas of nonlinear systems 

and control, neural networks in control, fuzzy control, multidimensional systems, power electronics, 

weld monitoring & control, power systems, telecommunications and biomedical systems 

applications. 


Nonlinear Control 

Control architectures for complex systems (i.e. global 

control), control using artificial intelligence, passivity and 

gain-based control of physical systems, nonlinear 

predictive control, analysis tools for robust control 

Power Systems 

Voltage collapse analysis and control of power systems, 

ancillary services markets for power system security, 

power quality monitoring and fault diagnosis 

Power Electronics 

Soft-switching and EMI reduction techniques for power 

converters, random switching schemes for power 

converters, active power filters, control of AC drives 

without mechanical transducers 

Telecommunications 

Total power control for CDMA communication systems, 

pseudo-noise code synchronization for direct-sequence 

spread-spectrum (DS-SS) systems 

Biomedical Systems 

Control of hand function via the use of electronic implant 

stimulators for people with paralysis of the hand and arm 

subsequent to high spinal cord injury, walking control for 

spinal cord-injured, control of gas supply for anaesthesia 

Staff 


Prof. David J Hill 

A/Prof. Hansen Yee 

Dr. Xiheng Hu 

Dr. Swamidoss Sathiakumar 

Dr. Yash Shrivastava 


Michael Rados 


Sylvia Pyman 


D. Hill, “Development of adaptive 

control strategies & techniques for 

power system operation in a 

competitive market”, SPIRT Industry, 

A$152,935, 2000-2002. 

7


Publications 


C. K. Lee, SYR, Hui, HS-H Chung, 

HS-H, Y. Shrivastava, “A 

randomized voltage vector switching 

scheme for three-level power 

inverters”, IEEE Transactions On 

Power Electronics, Vol. 17, pp.94- 


D. Debuf, Y. Shrivastava, A. Dunn, 

“General analytic solution to the 

Shockley-Read-Hall rate equations 

with a single-level defect”, Physical 

Review B, Vol. 65, 2002. 

M. Larsson, D. J. Hill, G. Olsson, 

“Emergency voltage control using 

search and predictive control”, 

International Journal Of Electrical 

Power & Energy Systems, Vol. 24, 


Q. L. Zhang, W. Q. Liu, D. J. Hill, 

“A lyapunov approach to analysis of 

discrete singular systems”, Systems 

& Control Letters, Vol. 45, 237-247, 


D. Popovic, D. J. Hill, Q. Wu, 

“Optimal voltage security control of 

power systems”, International 

Journal Of Electrical Power & 

Energy Systems, vol. 24, pp. 305-320, 


R. Fang and D. J. Hill, “A new 

strategy for transmission expansion 

in competitive electricity markets”, 

IEEE Transactions on Power 

Systems, Vol. 18, no. 1, pp. 374-380, 


8


Laboratory for Imaging Science 

and Engineering 

Prof. Hong Yan 

Head of Group 

Dr. David Levy 

Associate Professor 

The Image Processing Group encompasses a variety of projects representing diverse applications of 

advanced signal and image processing and pattern recognition technologies. In 2003 we carried out 

basic and applied research in the following areas: 

 

 

 

 

 

Document image analysis and recognition: text extraction from low quality documents, data 

compression, layout analysis and character recognition. 

Human face animation: automated generation of facial expressions. 

Biometric verification: human identification based on face, signature and fingerprint images. 

Image compression: improvement of image quality and compression ratio. 

Image segmentation: extraction of objects from background. 

We have published 12 journal papers and 6 conference papers during the year 2003. 


Document Imaging 

We have developed a technique for the extraction of text 

areas in a document image based on the Delaunay 

triangulation. By representing the location of connected 

components in a document image with their centroids, the 

page structure is described as a set of points in the twodimensional 

space. When imposing Delaunay 

triangulation on these points, the text regions in the 

Delaunay triangulation will have distinguishing triangular 

features from image and drawing regions. For analysis, 

the Delaunay triangles are divided into four classes. The 

study reveals that specific triangles in text areas can be 

clustered together and identified as text body. Using this 

method, text regions in a document image containing 

fragments can also be recognized accurately. Experiments 

show that the method is also very efficient. We have also 

developed advanced algorithms for segmentation and 

layout analysis of large newspaper images. 

Human face animation 

Computer facial animation is a challenging but very 

important area. We have proposed a novel method in 

which the non-uniform rational B-spline (NURBS) curve 

is used as a control mechanism to model and animate 

human facial expressions. A geometric similarity measure 

between the modification of NURBS curves and the 

movement of facial muscles is developed. Based on the 

geometric similarity, NURBS curves are constructed so 

that modifying these curves can closely simulate the 

movement of facial muscles. The control points of the 

NURBS curves are positioned according to facial 

anatomy and the NURBS curves are geometrically 

associated with a generic polygon mesh representing the 

face. The weights can then be changed or the control 

points repositioned to simulate various facial expressions. 

The proposed method performs better than existing facial 

9


animation methods and represents a new approach in 

geometric modelling for computer graphics. 

Signature verification 

Stability and style variation are important characteristics 

in handwriting analysis and recognition. We have 

developed a stability modelling technique of handwritings 

in the context of on-line signature verification. With this 

technique, the stability and style-variation characteristics 

of the reference samples are deduced from the dynamic 

warping relationship between the sequences of basic 

handwriting strokes. Reliability measures of the extracted 

signature features are incorporated into the signature 

segmentation, model building, and verification algorithms, 

so that stable handwriting features are emphasized in the 

signature matching process, while style variations for less 

stable features are tolerated. The generated signature 

model consists of a structure description graph of the 

handwriting components and their stability information. A 

signature is accepted by the model if it is close to a 

permissible path within the weighted graph. A novel 

feature of the technique is its ability to refine the 

correspondence relation of the handwriting during model 

building and signature verification. This ability enables 

the verification and partial correction of segmentation 

errors to reduce the number of false rejections while 

maintaining the system security level and keeping the 

number of reference samples manageable. 

Image compression 

We have investigated computer methods for reducing 

blocking artefacts in compressed images coded by the 

block discrete cosine transform (BDCT). The theory of 

projection onto convex sets (POCS) is applied. Two 

adaptive constraints are used. The first constraint 

corresponds to a model that simulates an image before 

compression using a Delaunay triangular mesh. The mesh 

is constructed by dividing each block into a set of 

triangles. The number of triangles in a block is 

determined by the local block activity. The second 

constraint is a narrow quantization constraint, where the 

bound of a BDCT coefficient is also determined by the 

local block activity. The block activity is measured by the 

ac components of the BDCT coefficients by incorporating 

the human visual system model. Our technique produces 

significantly improved results after a single iteration, and 

compares favorably with existing methods. 

Image segmentation 

We have developed an adaptive spatial fuzzy c-means 

clustering algorithm for the segmentation of threedimensional 

(3-D) magnetic resonance (MR) images. The 

input images may be corrupted by noise and intensity 

non-uniformity (INU) artefact. The proposed algorithm 

takes into account the spatial continuity constraints by 

using a dissimilarity index that allows spatial interactions 

between image voxels. The local spatial continuity 

constraint reduces the noise effect and the classification 

ambiguity. The INU artefact is formulated as a 

multiplicative bias field affecting the true MR imaging 

signal. By modelling the log bias field as a stack of 

smoothing -spline surfaces, with continuity enforced 

across slices, the computation of the 3-D bias field 

reduces to that of finding the B-spline coefficients, which 

can be obtained using a computationally efficient twostage 

algorithm. 

Staff 


Prof. Hong Yan 

A/Prof. David Levy 


Yan Chang 

Rong He 

Kai Huang 

Ding Huang 

Philpip Mitchell 

Savant Karunaratne 

Teewoon Tan 

Yi Xiao 

Zhanggui Zeng 

Qinzhi Zhang 

Mansuo Zhao 


D. Levy and H. Yan, “A novel image 

depression technique”, ARC large 

grant, A$161,096, 2001-2003. 

H. Yan, “Intelligent document image 

analysis & recognition systems”, 

ARC grant, A$224,910, 2000-2002. 

H. Yan, “Advanced techniques for 

extraction of text information from 

digital images”, SPIRT Industry, 


Publications 


S. Zhao, Z. Chi, P. Shi and H. Yan, 

"Tow-stage segmentation of 

handwritten Chinese characters based 

on fuzzy decision rules," Pattern 

Recognition, 36:145-156, 2003. 

Y. Xiao and H. Yan, "Text extraction 

in document images based on 

Delaunay triangulation," Pattern 

Recognition, 36(3):799-809, 2003. 

A. W. Liew, H. Yan and M. Yang, 

"Robust adaptive spot segmentation 

of DNA microarray images," Pattern 


Y. Wu, A. Liew, H. Yan and M. 

Yang, "DB-Cure, a novel 2D method 

of DNA sequence visualization and 

representation,” Chemical Physics 

Letters, 367:170-176, 2003. 

H. Okii, T. Uozumi, K. Ono and H. 

Yan, "Automatic feature extraction 

from breast tumor images using 

artificial organisms," IEICE Tans. Inf. 

& Sys., E86-D(5):964-975, 2003. 

A. W. Liew and H. Yan, "An 

adaptive spatial fuzzy clustering 

algorithm for 3-D MR image 

segmentation," IEEE Trans. Medical 

Imaging, 22(9):1063-1075, 2003. 

10


D. Huang and H. Yan, "Modeling of 

deformation using NURBS curves as 

controller," Signal Processing: Image 

Communications, 18:419-425, 2003. 

D. Huang and H. Yan, "NURBS 

curve controlled modelling for facial 

animation," Computers & Graphics, 

27:373-385, 2003. 

K. Huang and H. Yan, "Stability and 

style-variation modeling for on-line 

signature verification," Pattern 


J. J. Zou, H. Yan and D. Levy, 

"Reducing artifacts in block-coded 

images using adaptive constraints," 

Optical Engineering, 42(10)2900- 


Y. Wu, A. W. C. Liew, H. Yan and 

M. Yang, "Classification of short 

human exons and introns based on 

statistical features," Physical Review 

E, 67:0619161-0619167, 2003. 

X. Gan, A. W. C. Liew and H. Yan, 

"Blocking artifact reduction in 

compressed images based on edgeadaptive 

quadrangle meshes," J. 

Visual Communications & 

Representation, 14(4):492-507, 2003. 


S. Wu and H. Yan, "Microarray 

image processing based on clustering 

and morphological analysis," Proc. 

1st Asia Pacific Bioinformatics 

Conference, Adelaide, Australia, 

111-118, 2003. 

L. K. Szeto, A. Liew, H. Yan and S. 

Tang, "Gene expression data 

clustering and visualization using a 

binary hierarchical clustering 

framework," Proc. 1st Asia Pacific 

Bioinformatics Conference, Adelaide, 

Australia, 145-152, 2003. 

J. J. Zou and H. Yan, "Model-based 

smoothing for reducing artifacts in 

compressed images," Proc. IEEE 

ICASSP, 2003, III:741-744, 2003. 

A. Liew and H. Yan, "Adaptive 

fuzzy segmentation of 3D MR brain 

images," Proc. IEEE Int. Conf. Fuzzy 

Systems, St. Louis, USA, 978-983, 


A. W. C. Liew, H. Yan, and S. Wu, 

"A novel OPTOC-based clustering 

algorithm for gene expression data 

analysis”, Proc. 4th Int'l Conf. on 

Information, Communications & 

Signal Processing & 4 th IEEE 

Pacific-Rim Conf. on Multimedia, 

Singapore, 2003. 

S. S. Tang, H. Yan, J. Feng, L. K. 

Szeto and A. W. C. Liew, "A 

NURBS-based vector muscle model 

for generating human facial 

expressions”, Proc. 4th Int'l Conf. on 

Information, Communications & 

Signal Processing & 4 th IEEE 

Pacific-Rim Conf. on Multimedia, 

Singapore, 2003. 

11


Industrial Modelling and Sensing 

Technologies Laboratory 

A/Prof. Steve Dr. Swamidoss Dr. Yash Shrivastava Dr. Peiyuan Zhu 

Simpson 

Sathiakumar 

Head of Group Senior Lecturer Senior Lecturer Research Fellow 

Research activities in the group range from investigations of power electronics and drives to control 

and monitoring of arc and spot welding processes. Signal processing of EEG data is a new research 

area. 

In the area of welding, recent achievements include high speed filming of metal droplet formation 

and the transfer process. A model for simulation of commercial welding processes has been 

developed to make it more realistic. The group’s novel signal processing technology, signature 

image monitoring, has been commercialized by the Australian start-up company Welding 

Technology Innovations (WTi), which is a member of the Australian Technology Showcase. The 

company won the $100,000 inaugural Peter Doherty Prize for Australasian Innovation in 2003, and 

has recently accepted venture capital funding. 

The Welding Laboratory, which is well equipped for both continuous and transient welding studies, 

is a member of the OzWeld Welding and Joining Technology Support Centres Network for 

Australian Industry. In 2002-3, one PhD student completed his thesis. Research funding has come 

from the Australian Research Council. 

During 2003, Dr. Hidenori Terasaki visited from Osaka University to work on the welding 

simulation model WeldSim. Collaboration with Dr Armin Mohamed, Director of the 

Comprehensive Epilepsy Service at the Royal Prince Alfred Hospital, is under way in the area of 

processing EEG data. 


Continuous welding control and monitoring 

Researcher: A/Prof. Steve Simpson 

Emphasis has been on optimising performance of 

signature image data processing using a computer server 

network for training with laboratory data. Good results 

have been achieved in detecting off-seam lap joint faults, 

of key importance to the automotive industry worldwide. 

Drop-Spray Transfer Mode Identification 

Researchers: Dr. Peiyuan Zhu & A/Prof. Steve 

Simpson 

This project concentrated on the identification of a 

recently reported droplet transfer mode: “Drop-spray”, 

which appears in a narrow operating band in between the 

two predominant modes for free-flight metal transfer 

during welding: globular and spray transfer modes. 

Detailed understanding of this mode will be providing 

important experimental evidence for further theoretical 

12


study of the welding system. In this project we have 

investigated the relations between the welding voltage 

variation and the droplet transfer process. 

Droplet speed measurements & modelling 

Researchers: Dr. Peiyuan Zhu & A/Prof. Steve 

Simpson 

We have measured the travel speed of a free transferred 

droplet as a function of the time. The change in droplet 

speed directly reflects the interaction forces between the 

arc plasma and the travelling droplet. The initial research 

finding of this project confirms there are important 

interactions between the arc and droplet and work on 

explaining the results is under way. 

It is planned to develop a comprehensive model of the 

physical system in gas-metal arc welding which will 

explain the experimental features observed in the 

Laboratory. 

EEG monitoring 


The aim is to improve the lifestyle of people suffering 

from epilepsy by developing a diagnostic monitor which 

will warn them when they are about to have a seizure. 

Externally measured EEG signals are analysed by 

signature image processing, to determine when an 

epileptic seizure is about to happen minutes before it 

occurs. If patients are able to anticipate seizures prior to 

the onset, they will be able to institute preventative 

measures and lead as normal a life as possible. This 

research is carried out in collaboration with Dr Armin 

Mohamed, Director of the Comprehensive Epilepsy 

Service at the Royal Prince Alfred Hospital. 

Spot weld monitoring 


Laboratory work has shown good ability to identify 

common faults in spot welding using coated steels typical 

of the automotive industry. In the industrial environment 

of a large automotive company, it proved possible to 

detect changes in operating conditions associated with 

scheduled electrode machining. A complicating factor is 

the common occurrence of expulsion during spot welding 

of coated steels. 

Welding simulation 


The comprehensive model of the gas metal arc welding 

system has been further developed with assistance from 

Dr Hidenori Terasaki visiting from Osaka University. 

The model now includes a more accurate description of 

metal transfer during the short circuit phase of short-arc 

welding. 

Signature images for power quality 

Researchers: Dr S Sathiakumar, A/Prof. Steve 

Simpson 

The power grid is a huge network supplying power to 

different customers. Equipment connected to the grid 

having different characteristics causes harmonic pollution. 

As a result, some modern equipment, that is very sensitive 

to harmonic malfunction, can be damaged. It is of great 

concern to the power industry to ensure power quality. 

As a result power quality monitors are employed to 

monitor the quality at different nodes in a power network. 

In this project the monitoring of the power waveform is 

done using specific signatures of the power waveform to 

predict the power quality. 

Estimation and speed control for an ac 

machine 

Researchers: Dr. S Sathiakumar, Dr. Yash 

Shrivastava 

The speed control of a machine usually requires a 

mechanical speed sensor mounted on the shaft. The 

mechanical speed sensors are inherently unreliable and in 

some cases impossible to mount. So in order to make the 

drive system more reliable it has been a challenge to do 

away with the mechanical sensors altogether. This 

requires implementing ‘soft sensors’ that use the terminal 

voltage and current measurements of the machine to 

estimate the speed. In this project various speed 

estimation algorithms are investigated and the stability of 

the speed control system using the estimated speed is 

studied. 

Switching schemes for 3-level inverters 

Researchers: Dr. Yash Shrivastava, Dr. S 

Sathiakumar 

Advances in power electronics have made possible an 

efficient conversion from DC to AC power through the 

use of semiconductor switches. To reduce the stress in the 

switches for high power applications (e.g. HVDC 

transmission) many switches are used in a series 

connection. This project investigates the use of a 3-level 

inverter and proposes different switching schemes to 

improve the quality of power supply. 

Random switching for dc-dc power 

conversion 

Researchers: Dr. Yash Shrivastava, Dr. S 

Sathiakumar 

Randomised modulation technique has recently been 

recognised as an emerging technology. The basic 

principle of introducing randomness into standard PWM 

schemes is to spread the harmonic power which exists at 

well defined frequencies (discrete harmonics) over a wide 

range of frequencies so that no harmonic of significant 

magnitude exists. As a result, discrete harmonics are 

significantly reduced and the harmonic power is spread 

13


over the spectrum as ‘noise’ (continuous spectrum) of 

insignificant magnitude. Due to the reduction of discrete 

harmonics, the DC-AC randomised switching methods 

have been shown to have obvious advantages of acoustic 

noise reduction and mechanical vibration reduction in 

electronic drive systems. In this project various random 

switching schemes are investigated to improve the 

spectral performance. 

Staff 


A. Prof. Steve Simpson 

Dr Swamidoss Sathiakumar 

Dr Yash Shrivastava 

Dr. Peiyuan Zhu 


Marcel Kaegi 


Peter Hughes 


Simpson, S.W., and Shrivastava, Y., 

"Dynamic control of gas metal arc 

welding with signature images", 

ARC large grant, A$158,741, 2001- 


Simpson, S.W., "Intelligent 

monitoring and control of resistance 

spot welding", ARC large grant, 


S. Sathiakumar, “Environmentally 

green energy management system for 

future homes/offices”, Joint project 

with H. Kong at Polytech University, 


Publications 


Hole, M.J., and Simpson, S.W., 

“Analytical Description of a 

Collisional Plasma Column in a 

Vacuum Arc Centrifuge”, J. Phys. 

D.:Appl. Phys. 34, 3028-3035, 2002. 

Hole, M.J., Dallaqua, R., Simpson, 

S.W. and Del Bosco, E., “Plasma 

Instability of a Vacuum Arc 

Centrifuge”, Phys. Rev. E. 65, 

046409-1-046409-15, 2002. 

Lin, Q., and Simpson, S.W., “The 

application of Fuzzy Logic Control 

in Gas Metal Arc Welding”, 

Australasian Welding Journal - 

Welding Research Supplement, 48, 

33-40, 2003. 

Debuf, D., and Shrivastava, Y., “A 

general analytic solution to the 


with a single-level defect”, 

Proceedings PV in Europe from PV 

Technology to Energy Solutions 

Conference and Exhibition, Palazzo 

dei Congressi, Rome, Italy, October 


Debuf, D., Shrivastava, Y., and Dunn, 

A., “General analytic solution to the 


with a single-level defect”, Physical 

Review B, vol. 65, issue 24, article 

245211, June 2002. 

Lee C.K., Hui, S.Y.R., Chung, H., 

and Shrivastava, Y., “A randomized 

voltage vector switching scheme for 

three-level power inverters”, IEEE 

Transactions on Power Electronics, 

vol. 17, pp. 94-100, January 2002. 


Simpson, S.W., “Fault Recognition 

in Resistance Spot welding with 

Signature Images”, Commission III 

of the 55th Annual Assembly of the 

International Institute of Welding, 

IIW Doc. III-1215-02, Copenhagen, 

Denmark, 26-28 June 2002. 

Hughes, P., and Simpson, S.W., 

“Industrial Application Of Welding 

Signatures For Real Time Quality 

Assurance And Process 

Improvement”, 12th International 

TWI Computer Technology in 

Welding Conference, paper 67, 

August 2002, Sydney, Australia. 

Patents 

Simpson, S.W., "Welding 

Assessment", U.S.A. Patent 

Application 10/149777, South 

Korean Patent Application 10-2002- 

7007624, Canadian Patent 

Application 2393773, Australian 

Patent Application 21301/01, 

Chinese Patent Application 

00817251.x, Indian Patent 

Application IN/PCT/2002/00740, 

Japanese Patent Application 2001- 

545030, 2002. 

14


Fibre-optics and Photonics Laboratory 

Prof. Robert Dr Javid Atai Dr Ningsi You Dr. Hong Ke Mr. Erwin Chan 

Minasian 

Head of Group Senior Lecturer Research Fellow Research Fellow Research Fellow 

Ms. Xiaoke Yi 

Research Fellow 

Mr. Mingya Shen 

Research Assistant 

The Fibre-optics and Photonics Laboratory specialises in research into advanced optical techniques 

for information systems. This focuses on fundamental research in areas including photonic signal 

processing, optical communications, microwave photonics, nonlinear optical phenomena, opticallycontrolled 

phased arrays, and terahertz/gigahertz photonics in communication and radar systems. 

Recent highlights include new photonic signal processing structures that enable high-resolution and 

adaptive processing of high-speed signal in fibre, and new WDM dispersion managed systems and 

nonlinear optical dynamics. 

The Fibre-optics and Photonics Laboratory is involved in collaboration with the Australian 

Photonics Cooperative Research Centre. The Fibre-optics and Photonics Laboratory has won 

significant research funding from nationally competitive grant schemes including the Australian 

Research Council, and the Australian Photonics CRC; from statutory agencies including the 

Defence Science and Technology Organisation, and the Commonwealth Scientific and Industrial 

Research Organisation; and from industry. 

The research of the Fibre-optics and Photonics Laboratory links with an extensive international 

network of photonics research institutions around the world. 


Photonic Signal Processing 

Researchers: Robert Minasian, Erwin Chan, Ningsi 

You, Jack Chen, Xiaoke Yi 

Support: ARC Discovery Grant 

This project aims to develop new photonic signal 

processing structures that can manipulate broadband 

signals. An important aspect of the work is to explore 

techniques to make the processors adaptive and tunable so 

that the characteristics can be controlled for information 

processing. Optical signal processing is expected to 

effectively handle high-speed, broadband signals in 

15


advanced optical communications systems and 

information processing. This can provide direct 

interfacing of fibre processing with high-speed systems. 

Photonic signal processors can overcome limitations 

imposed by conventional electrical signal processors at 

sampling speeds above 1 GHz. In addition photonic 

processors are compatible with fire-optic transmission 

systems and can process signals in the optical domain 

directly. Research is aimed at deriving new structures that 

can perform high speed processing tasks on the signals 

that are contained within the fibre. Applications both in 

the frequency domain and time domain include 

microwave filtering, interference suppressors, channel 

selectors, fast signal correlation, matched filtering and 

programmable delay lines. 

The structures being researched are based on discrete time 

signal processors using Bragg grating sampling elements 

and multiple wavelength techniques. The objectives are to 

investigate new structures that can realise high-resolution 

optical filters for microwave signals. An additional 

objective is to investigate techniques to make these 

processors widely tunable and adaptive, to enable highresolution 

microwave optical signal processing with high 

time-bandwidth operation. 

Dispersion managed solitons 

Researchers: Javid Atai, Saul Carroll 

The aim of this project is to study the propagation of 

optical pulses in dispersion managed links particularly in 

the presence of optical filtering. One of the goals this 

project is to find better ways of suppressing Gordon-Haus 

jitter. 

Lightwave Synthesiser 

Researchers: Robert Minasian, Mingya Shen, Hong 

Ke, Jean Duquennois 

Support: ARC Large Grant 

This project aims to study a new concept for synthesising 

a large number of different wavelengths from a single 

laser. Such sources are essential for gigahertz photonic 

signal processing functions and dense wavelength 

division multiplexed systems. The objective is to generate 

a large number of wavelengths at precise frequencies, and 

also have the ability of tuning the microwave frequency 

spacing between the wavelengths. The lightwave 

synthesiser output aims to provide a comb of precisely 

defined optical frequencies locked to a highly stable 

master laser, together with accurate frequency channel 

spacing that can be arbitrarily chosen over a wide range of 

frequencies. 

Nonlinear pulse propagation in periodic 

media 

Researchers: Javid Atai, Boris Malomed 

In this project we have studied the stability of Bragg 

grating solitons in media where the sign of nonlinearity is 

periodically changing ("nonlinearity management"). We 

have found that the stability diagram in this model is a 

universal one inthat it is not dependent on the soliton's 

power. 

Optically-controlled Phased Arrays 

Researchers: Robert Minasian, Ningsi You, Erwin 

Chan, Hong Ke, Mingya Shen 

Support: Australian Photonics Cooperative Research 

Centre 

This project aims to derive new architectures of optical 

phased arrays that realise high capacity phased array 

antennas that can generate high-resolution steerable 

beams and which can operate with wide bandwidth. 

Future radar and communication systems will require 

phased array antennas that can achieve true-time delay 

beam-forming and which can synthesises a large number 

of beams. The important advantages of wideband and 

squint-free operation motivate the use of optical 

beamforming techniques. 

The aim is to investigate new photonic-based 

beamforming architecture that can realise a true-time 

delay beam steering in wide-band phased array antennas. 

This is based on fibre Bragg grating true time delay 

elements and multiple wavelength WDM techniques. This 

exploits the wavelength selectivity of gratings to realise a 

highly parallel delay processing function, which perform 

the complex signal delay processing equalisation on a 

large number of array elements simultaneously within the 

fibre. Our new architecture uses wavelength mapping to 

the array elements and partitioning concepts. Another 

objective is to investigate new direction finding 

techniques using photonics-based techniques that solve 

the accuracy and wideband operation requirements of 

these systems. The aim is to open the way to the 

realization of high-functionality arrays for high-resolution 

multiple-beam antennas with wideband operation. 

WDM photonic downconverter 

Researchers: Robert Minasian, Erwin Chan 

Support: Australian Photonics Pty. Ltd., DSTO 

Photonic mixing has several advantages over the 

conventional approach of direct detection of the optical 

carrier followed by electronic mixing. This includes a 

higher conversion efficiency and dynamic range. In 

addition, photonic mixing has inherent high isolation due 

to the optical interaction process in mixing, immunity of 

EMI and crosstalk, and the ability of operating over very 

wide bandwidths. 

This project aims to derive new techniques that provide 

linearisation as well as wideband mixing capability. The 

objective is to use WDM techniques to simultaneously 

frequency convert multiple carriers. Another objective is 

to increase the dynamic range characteristics. 

Investigations involve optimum optoelectronic device 

structures for increasing the spurious free dynamic range, 

and for reducing the noise figure. The aim is to obtain 

new topologies that overcome existing limitations of 

16


mixers, and to increase the dynamic range, which is a 

fundamental requirement of receiver systems. 

Solitons in dual-core optical waveguides 

Researchers: Javid Atai, Boris Malomed 

In this project stability and interactions of spatial solitons 

in a model of two linearly coupled nonlinear optical 

waveguides with a phase-velocity difference between 

them are investigated. By means of systematic numerical 

simulations, conjectures about stability of different 

branches of solitons in this system are verified. 

Additionally, a stable branch into which unstable solitons 

evolve is identified. It is also shown that the outcome of 

interaction depends on the initial separation and 

asymmetry parameter. 

Microwave Photonics 


You, Hong Ke 

Support: Australian Photonics Cooperative Research 

Centre 

There is currently investigation of possible applications of 

photonics applicable to the development of radar and 

microwave signal conditioning systems. This includes 

optimum optical modulation formats and structures for 

programmable photonic delay lines. The project also aims 

to develop new photonic-based tunable filters to provide 

signal conditioning in receivers. Future receiver systems 

will utilise the benefits of fibre optics and it is useful to 

implement as much signal conditioning as possible in the 

fibre. The objective of this project is to investigate new 

structures for signal conditioning of RF signals using 

optical fibre and widely tunable filters implemented in the 

fibre. 

Optical Fibre Transmission and Interference 

Mitigation Filters 

Researchers: Robert Minasian, Erwin Chan 

Support: Australian Research Council, CSIRO. 

Two critical aspects of research relating to nextgeneration 

antenna arrays relate to the transmission of 

broadband (>1GHz) signals over the array network and 

the removal of interfering signals. The objective of this 

project is to investigate new fibre-based filter structures 

that can suppress interference and which are compatible 

with fibre-optic transmission systems. 

Wavelength division multiplexing in a 

stabilized Ginzburg-Landau system 

Researchers: J. Atai, B.A. Malomed, D.J. 

Frantzeskakis, K. Hizanidis 

We have studied the stability and interactions of chirped 

solitary pulses in a system of nonlinearly coupled cubic 

Ginzburg-Landau (CGL) equations with a group-velocity 

mismatch between them, where each CGL equation is 

stabilized by linearly coupling it to an additional linear 

dissipative equation. In the context of nonlinear fiber 

optics, the model describes transmission and collisions of 

pulses at different wavelengths in a dual-core fiber, in 

which the active core is furnished with bandwidth-limited 

gain, while the other, passive (lossy) one is necessary for 

stabilization of the solitary pulses. It is demonstrated that 

the model may readily support fully stable pulses whose 

collisions are quasielastic, provided that the groupvelocity 

difference between the two channels exceeds a 

critical value. In the case of quasielastic collisions, the 

temporal shift of pulses, predicted by the analytical 

approach, is in semi-quantitative agreement with direct 

numerical results in the case of anomalous dispersion. We 

also consider a simultaneous collision between pulses in 

three channels. It is found that this collision remains 

quasielastic, and the pulses remain completely stable. 

Novel optical discrete time processor filters 


You, Mingya Shen 

Support: University of Sydney Sesqui R&D Grant 

Fibre-optic delay lines are finding an increasing number 

of applications in the fields of communications and 

photonic signal processing. There is a need for generating 

small time delay steps of the order of ps-steps as a 

function of wavelength, for example in wavelength 

multiplexed optical beamforming networks for 

microwave phased arrays and photonic signal processors. 

We have obtained a new approach for generating 

extremely small time delay steps that uses multiple 

overwritten gratings with different Bragg wavelengths in 

the same length of fibre. This has demonstrated very 

small delay steps, potentially below 1 ps, for the 

generation of the delay increments that are required in 

high-resolution processors. 

This project also aims to solve several fundamental 

challenges, including coherence limitations, and methods 

for generating negative taps. Another objective is to 

investigate topologies for photonic signal processors that 

overcome the limitations of a periodic frequency response 

to enable the realisation of photonic signal processors 

with wide passband. 

Photonics-based Arbitrary Waveform 

Generators 

Researchers: Robert Minasian, Mingya Shen 

Support: Australian Research Council 

The synthesis of high-speed arbitrary waveforms using 

photonics has attracted significant interest because of its 

importance in a range of applications such as radar, signal 

processing, and communications. This stems from the 

potential ability of photonics techniques to overcome the 

inherent limitations of electronics-based approaches in 

generating high frequency waveforms and achieving the 

very high sampling frequencies required and the limited 

speed and linearity of electronic device technology such 

as digital-to-analog converters. 

This project investigates new photonic methods for 

generating high-speed arbitrary RF waveforms. It is based 

17


on the generation of short sample pulses using photonics, 

the generation of high sampling rates using short delay 

steps in fibre grating reflectors in conjunction with a 

novel delay line structure, and the generation of arbitrary 

high-speed waveforms using sample weighting and 

filtering. The technique employs a simple fiber optic 

structure, and is capable of synthesizing wideband 

waveforms with high resolution. 

New Optical Sources for Photonic Signal 

Processing 

Researchers: Robert Minasian, Yuan Li 

Support: Australian Research Council 

Photonic signal processing offers the potential of highspeed 

processing of signals directly in the optical domain 

to realise fiber systems with built-in signal conditioning. 

In order to avoid optical interference effects and obtain 

robust transfer functions, nearly all photonic signal 

processors operate in the incoherent regime. This requires 

that the coherence time of the optical source is shorter 

than the minimum time delay in the processor. Hence, for 

high-speed processors that operate at multi-GHz 

fundamental frequencies, this requires an optical source 

with a relatively large linewidth appropriate to the 

processor frequency. 

However, optical sources with suitable linewidth are not 

readily available. Intrinsic laser linewidth is usually too 

small and can cause coherent interference effects in the 

processor. On the other hand, broadband sources such as 

ASE and SLD sources that have extremely wide spectral 

bandwidths, as needed for sensor applications, are 

unsuitable because of their low power density. Hence, 

spectrum-slicing approaches from such broadband 

sources are usually limited by the low source power 

generated. 

This project investigates new structures that can generate 

optical sources of optimum linewidth for photonic signal 

processor applications, and which can simultaneously 

achieve a high power. The structures are based on a twostage 

double-pass topology. A significant feature of this 

novel optical source is that it can achieve extremely high 

conversion efficiency without the presence of lasing 

effect and it can realise a source with appropriate 

linewidth for photonic signal processing. 

18 

Staff 


Prof. Robert Minasian 

Dr Javid Atai 

Research Staff 

Dr. Ningsi You 

Dr Hong Ke 

Erwin Chan 

Mingya Shen 

Xiaoke Yi 


Bernie Press 


Colleen Moore 


Saul Carrol 

Erwin Chan 

Jack Chen 

Jean Duquennois 

John Haywood 

Yuan Li 

Yahua Li 

Yuqing Liu 

Mingya Shen 

Ningsi You 


Minasian, R.A., “New photonicsbased 

interference mitigation filters 

for radioastronomy”, Australian 

Research Council, Discovery Grant, 


Minasian, R.A., “Lightwave 

Synthesiser for Array Beamforming”, 

Australian Research Council Large 

Grant, A$225,332, 2000-2002. 

Green, Sadler, Melrose, Ekers, Bailes, 

Tingay, Briggs, Hunstead, Eggleton, 

Everitt, Ashley, Schmidt, Minasian, 

et al., “Frontier technologies, 

prototypes and strategic positioning 

for the international radio telescope, 

the Square Kilometre Array”, ARC 

Research Network, A$10,000, 2003. 

Minasian, R.A., “WDM transponder”, 

Australian Photonics Cooperative 

Research Centre, A$250,000, 

2003/04. 

Minasian, R.A., “Optical signal 

processing”, Australian Photonics 

Cooperative Research Centre, 


Minasian, R.A., “Photonic 

processors”, Australian Photonics 

Cooperative Research Centre”, 

A$248,544, 2001/02. 

Minasian, R.A., “Novel optical 

discrete time processor filters”, 

University of Sydney Sesqui R&D 


Minasian, R.A., “Microwave 

spectrum analyser”, University of 

Sydney, Sesqui, Major Equipment 


Minasian, R.A., “Photonic WDM 

downconverter topology with 

electro-absorption modulator based 

RF sections”, Australian Photonics 

Pty Ltd., A$13,640, 2003. 

Publications 


Atai, J. and Malomed, B. A., 

“Stability and interactions of solitons 

in asymmetric dual-core optical 

waveguides”, 

Optics 

Communications, Vol. 221, pp. 55- 


Atai, J. and Malomed, B. A., “Spatial 

solitons in a medium composed of 

self-focusing and self-defocusing 

layers”, Physics Letters A, Vol. 298, 


Nistazakis, H. E., Frantzeskakis, D. J., 

Atai, J. and Malomed, B. A., 

Efremidis, N., and Hizanidis, K., 

“Multichannel pulse dynamics in a


stabilized Ginsburg-Landau system”, 

Physics Review E, Vol. 65, 036605- 

1-036605-12, 2002. 

Chan, E.H.W., and Minasian, R.A., 

“Novel all-optical RF notch Filters 

with equivalent negative tap 

response”, IEEE Photonics 

Technology Letters, Vol. 16, No. 5, 

pp. 1370-1372, (2004). 

Shen, M., and Minasian, R.A., 

“Toward a high-speed arbitrary 

waveform generation by a novel 

photonic processing structure”, IEEE 

Photonics Technology Letters, Vol. 

16, No. 4, pp. 1155-1157, (2004). 


“Photonic notch filter without optical 

coherence limitations”, IEEE Journal 

of Lightwave Technology, accepted, 

scheduled for Vol. 22, No. 7, July, 

(2004). 


“High-resolution photonics-based 

interference suppression filter with 

wide passband”, IEEE Journal of 

Lightwave Technology, Special Issue 

on Microwave Photonics, Vol. 21, 

No. 12, pp. 3144-3149, 2003. 

Chan, E.H.W., Alameh, K.E., and 

Minasian, R.A., “A photonics-based 

wideband linearised microwave 

mixer”, Microwave and Optical 



Chan, E.H.W., Alameh, K.E., and 

Minasian, R.A., “Photonic bandpass 

filters with high skirt selectivity and 

stopband attenuation”, IEEE/OSA 

Journal of Lightwave Technology, 

Vol 20, No. 11, pp. 1962-1967, 2002. 


“Linearization processing of a novel 

short time-delay WDM superposed 

fibre Bragg grating”, IEEE Photonics 



Minasian, R.A., and Alameh, K.E., 

“A modern and interactive approach 

to learning laser and optical 

communications”, The British 

Journal of Educational Technology, 

Vol. 33, No. 2, pp. 237-242, 2002. 


Minasian, R.A., and Alameh, K.E., 

“Photonic signal processing”, Invited 

Paper, International Union of Radio 

Science, URSI 27 th General 

Assembly, Paper D7-1, Proceedings, 

p. 192, Maastricht, The Netherlands, 



“Design of superposed fiber Bragg 

grating for high-resolution timedelay 

signal processing”, in 

Proceedings of SPIE Vol. 4998, 

Photonic Integrated Systems, pp. 

170-177, San Jose, USA, 2003. 


“Coherence-free photonic notch 

filter”, Communication Systems, 

Networks and Digital Signal 

Processing International Symposium, 

CSNDSP’2004, accepted, Newcastleon-Tyne, 

UK, July, (2004). 


processing of microwave signals”, 

Invited Paper, IEEE AP/MTT NSW 

Chapter, Oct. 2002. 

Li, Y., and Minasian, R.A., “High 

power and low coherence fibre-optic 

source for incoherent photonic signal 

processing”, Symposium on Optoand 

Microelectronic Devices and 

Circuits, IEEE sponsored, 

SODC’2004, pp. 172-176, Wuhan, 

China, (2004). 


“Serrodyne optical frequency 

translation using photonic generated 

sawtooth waveform”, Australian 

Conference on Optical Fibre 

Technology, ACOFT’04, accepted, 

July, (2004). 


“Photonics-based optical frequency 

comb generation”, Australian 


Technology, ACOFT’04, accepted, 

July, (2004). 


“Photonic generation of arbitrary 

waveforms”, Proc. Conference on the 

Optical Internet/Australian 


Technology, COIN/ACOFT 2003, pp. 

361-364, Melbourne 2003. 


processing of microwave signals”, 

European Microwave Conference, 

EuMC, Paper WM3-9, Milan , Italy, 

2002 

Patents 

MINASIAN, R.A., and YOU, N., 

“High-Q optical microwave 

processor using hybrid delay-line 

filters”, United States Patent, No. 

6681065, 2003. 

Minasian, R.A., and Chan, E.H.W., 

“A photonic RF or microwave notch 

filter”, Australian Provisional Patent 

application, No. 2003903255, 2003. 

Commissioned 

Report 

Research 

Minasian, R.A., “Photonic WDM 

downconverter topology with 

electro-absorption modulator based 

RF sections”, Commissioned 

Research Report for Australian 

Photonics Pty Ltd., 14 pp., 2003. 

19


Telecommunications Laboratory 

Prof. BrankaVucetic Dr Abbas Jamalipour Dr. Iain Collings Dr. Guoqiang Mao Dr. Yonghui Li 

Head of Group Associate Professor Senior Lecturer Lecturer Research Fellow 

The Telecommunications Laboratory specializes in the important area of data transmission, with 

applications including mobile cellular radio, fixed satellite, mobile satellite, wireless systems, and 

telephone networks. The laboratory is also active in network traffic analysis, network performance 

analysis, broadband ISDN systems, network architectures, high speed DSL modems, and spread 

spectrum communications. 

The main focus in the Laboratory is on fundamental research. Recent main achievements include 

optimum modulation codes for fading channels, optimum soft output detection and decoding 

algorithms, channel models for satellite mobile channels and adaptive receivers for code division 

multiple access (CDMA). 

The Telecommunications Laboratory has significant research funding from competitive grants 

schemes such as the ARC. It is also involved in close collaboration with industry, both in Australia 

and internationally. The current industry funding supports a number of projects within the group. 

Research collaborations are also maintained with a number of international research groups, 

including those at the University of California at Berkeley (USA), and the University of Kiel 

(Germany). 

Currently we have four academic staff, three research and technical staff, and a number of 

postgraduate students. 


Weighted Space Time Turbo Trellis Codes 

Researchers: Branka Vucetic, Yohghui Li, Jinhong 

Yuan and Agus Santoso 

Support: ARC Discovery Grant, Norman I Price 

Scholarship and Girling Watson Fellowship 

Space-time coding, carried out in both the time and space 

domains, is a practical technique that enables to approach 

the MIMO system capacity bounds. The simplest example 

of space-time coding is the Alamouti scheme, which has 

been adopted as a standard for the third generation of W- 

CDMA cellular radio networks and IEEE 802.16 

broadband wireless access systems. It is simple to 

implement but has no coding gain and its performance is 

far from the MIMO system capacity limit. Space-time 

trellis codes achieve substantial coding and diversity 

gains and are simple to implement for small numbers of 

transmit antennas. Layered space-time codes (LST), with 

time domain coding only, achieve high coding and 

diversity gains but the detection/decoding is quite 

challenging for a large number of transmit antennas. 

Space-time turbo trellis coded modulation schemes, 

outperform the other known ST codes. All these space- 

20


time coding schemes use channel state information (CSI) 

at the receiver only. Substantial further improvements are 

possible by exploiting CSI both at the transmitter and the 

receiver, as demonstrated in our recent results in MIMO 

systems with transmit antenna selection. In this project 

the performance and design of space-time turbo trellis 

codes with variable power across transmit antennas if 

both full and partial CSI are available at the transmitter 

will be investigated. 

Layered space time codes with partial 

channel information feedback 

Researchers: Branka Vucetic, Yonghui Li and 

Rushikesh Kalaspurkar 

Support: Norman I Price Scholarship, Girling 

Watson Fellowship 

Layered space-time codes (LST), with time domain 

coding only, achieve high coding and diversity gains but 

the detection/decoding is quite challenging for a large 

number of transmit antennas. The performance of layered 

space-time trellis codes can be considerably improved if 

the channel state information is available at the 

transmitter and exploited for signal weighting across 

transmit antennas. In this project we propose to consider 

joint transmit signal weighting and layered space-time 

codes to simultaneously optimize coding, diversity and 

weighting gains. We define the weighting gain as the 

signal-to-noise gain of a weighted space-time trellis coded 

MIMO system relative to a non-adaptive MIMO system 

with the same space-time code. The research includes the 

performance evaluation of layered adaptive space-time 

layered coded Gaussian MIMO system, design and 

optimization of weighting schemes and design of 

optimum layered codes for the optimum weighting 

scheme. We also consider the design of the signal 

weighting and its optimization at the receive antennas. 

Weighted Space Time Trellis Codes for 

Multiple Receive Antennas 

Researchers: Branka Vucetic, Yonghui Li and Agus 

Santoso 

Support: Norman I Price Scholarship, Girling 

Watson Fellowship 

The performance of space-time trellis codes can be 

considerably improved if the channel state information is 

available at the transmitter and exploited for signal 

weighting across transmit antennas. In this project we 

consider joint transmit & receive signal weighting and 

space-time coding to simultaneously optimize coding, 

diversity and weighting gains. We define the weighting 

gain as the signal-to-noise gain of a weighted space-time 

trellis coded MIMO system relative to a non-adaptive 

MIMO system with the same space-time code. The 

research includes the performance evaluation of an 

adaptive space-time trellis coded Gaussian MIMO system, 

design and optimization of weighting schemes and design 

of optimum space-time trellis codes for the optimum 

weighting scheme. The effect of channel estimation and 

prediction errors on the system performance is also 

considered to determine its robustness in practical 

systems. In a preliminary study with a non-optimum 

weighting scheme, new weighted 4-state QPSK spacetime 

codes have been designed with a weighting gain of 

2.25 dB and a coding gain of 0.6dB compared to the 

comparable standard space-time trellis code designed by 

Tarokh et all. Further improvements are expected for 

optimum weighting schemes. 

Adaptive Transmission Strategies for MIMO 

Systems 

Researchers: Branka Vucetic, Yonghui Li, 

Zhendong Zhou and Rushikesh Kalaspurkar 

Support: DEST Grant, Norman I Price Scholarships, 

Girling Watson Fellowship 

In wireless communication systems the channel is subject 

to deep fades that cause large signal power variations. 

Non-adaptive transmission strategies are typically 

designed for the worst channel conditions and require 

fixed power margins or very powerful coding to maintain 

an acceptable performance in deep fades. Obviously, in 

this approach the system resources are not used efficiently. 

If the channel state information is available at the 

transmitter, the system characteristics such as power, rate, 

coding scheme and bit error rate (BER) can be adapted to 

obtain the best performance. Some forms of adaptive 

schemes have been proposed for next generation wireless 

systems. 

In MIMO systems in addition to time variations, multiple 

transmit and receive antennas introduce an additional 

dimension in signal processing. The aim of the project is 

to carry-out a general form of MIMO systems power, 

coding, BER and data rate adaptations in both time and 

space domain, that maximize the spectral efficiency. A 

general case adaptive system is formulated as a non-linear 

optimization problem with non-linear constraints. A 

systematic study on the spectral efficiency variations by 

optimally varying combinations of the system parameters 

and a trade-off analysis is provided. 

Iterative Receivers for Multi-path MIMO 

Interference Cancellation 

Researchers: Branka Vucetic, Yonghui Li, Chakree 

Teekapakvisit, Joseph Chueh and Osamu Takyu 

Support: Keio University Fellowship, ARC Grant, 

Girling Watson Fellowship 

The performance of all practical wireless communication 

systems, including cellular radio and WLANs, is limited 

by interference. There are various sources of interference, 

such as multiple access interference caused by nonorthogonal 

code sequences in Coded Division Multiple 

Access (CDMA) systems, signals transmitted from 

different antennas in layered space-time coded systems, or 

multi-path propagation. 

Higher data rates imply that the signal will be 

increasingly prone to destructive effects of frequency 

21


selective fading caused by multi-path propagation. This 

phenomenon is even more pronounced in MIMO systems, 

as multi-path interference consists of multiple echoes of 

the desired signal as well as echoes of the signals from 

other transmit antennas. 

A conventional approach in reducing multi-path 

interference is by RAKE receivers. Though it is effective 

in CDMA systems, in space-time coded CDMA systems 

with a large number of multi-paths, the residual 

interference is considerable. 

In this project we derive a new iterative receiver for 

layered space-time coded systems over frequency 

selective fading channels. 

MIMO Radar Communications 

Researchers: Branka Vucetic and Abner Ephrath 

The application of MIMO principles in wireless 

communications resulted in enormous spectral efficiency 

and performance gains. In today’s radar systems single 

receive antennas are used for both transmission and 

reception. In a preliminary research, a realization of 

MIMO radar systems has been explored. The MIMO part 

of the system is based on an un-coded layered system 

with multiple transmit antennas, while the radar signal 

generation is standard and based on phase modulation. 

The space-time divider splits a long and complex radar 

pulse into n “slices” in time, where n is the number of 

transmit antennas, and each “slice” is directed to a 

different transmit antenna. The signals transmitted 

simultaneously from various antennas, propagate over 

independently scattered paths and interfere with each 

other upon reception. The received signal for a particular 

transmit antenna, contains interference from other 

transmit antennas. In addition, there is inter-symbol 

interference (ISI) caused by multi-path and clutter. Each 

receive antenna gets a linear combination of the signals 

from all transmit antennas. In order to recover signals sent 

from each transmit antenna, the detector carries out multistage 

interference cancellation by making interference 

estimates and removing them from the received signal. 

Generalized Design of Space Time Block 

Codes 

Researchers: Yonghui Li 

Support: Girling Watson Fellowship 

Alamouti has proposed a simple space time block codes 

(STBC) for two transmit antennas, and it is generalized to 

an arbitrary number of antennas by Tarokh. A space time 

block code can achieve a full diversity order, but no 

coding gains. To improve the performance of STBC, 

further optimization is necessary by using super-set 

partitioning. The signals transmitted from two transmit 

antennas construct a super constellation, represented by 

the Cartesian product of the two constellations, thus the 

traditional super-set partitioning algorithm can be applied 

to partition the super-set into subsets with fewer points 

and construct a new trellis. The trellis coded signals are 

then coded by the traditional STBC. The proposed 

scheme can achieve not only a full rate and a full diversity 

order, but also an additional coding gain. 

Furthermore, it is proposed to develop STBC using 

lattices, along with the design of STBC with partial 

channel information feedback, product STBC codes with 

iterative decoding and a simplification of the decoding 

algorithm by using sphere decoding. 

Design of Space Time Codes for Broadcast 

Channels 

Researchers: Yonghui Li and Branka Vucetic 

Support: Girling Watson Felloship 

The downlink in cellular radio systems is critical in 

mobile Internet system design, due to high demands for 

information downloading. This link is an example of a 

broadcast channel (BC). It has been demonstrated that if 

the transmitter, but not the receiver, of a BC channel has 

perfect knowledge of additive Gaussian interference, the 

capacity of the channel is the same as if there is no 

interference. If the transmitters can co-operate, coding for 

non-causally known interference can be used to suppress 

unwanted signals from other transmitters. This scheme is 

called the Dirty Paper Coding (DPC). It implies that by 

using this type of pre-coding at the transmitter, it is 

possible to send messages from the transmitter to various 

receivers, simultaneously and in the same frequency band, 

and thus substantially improve the spectral efficiency. 

This result, due to Costas, was published in 1980, but it 

has not attracted much attention in the research 

community, as the proposed pre-coding scheme, is very 

hard to implement. It requires a brute force search of the 

entire space of the system input covariance matrices that 

meet the power constraint. In this project we designed 

practical pre-coding schemes in wireless downlinks, 

based on coset codes, that would approach the capacity of 

MIMO BC. We also develop space-time coding 

techniques for BC. 

Ultrawide Band Com munication Systems 

Researchers: Branka Vucetic and Yang Tang 

Support: Norman I Price Scholarship 

Wireless Ultra-Wideband communications systems enable 

high data rates with lower power consumption and have 

emerged as an exciting technology for the multimedia 

application. As the UWB communications systems are 

required to operate in multiple-user and dense multipath 

environments, the multiple access interferences (MAI) 

and intersymbol interferences (ISI) induced adversely 

effect system capacity and performance. A novel 

multiuser detection scheme for asynchronous Ultra- 

Wideband impulse radio systems is demonstrated based 

on the double stages block-spread code-division multipleaccess 

(BS-CDMA), which successfully maintains the 

code orthogonality at the receiver under the asynchronous 

environment. As a result, the MAI are completely 

mitigated. 

22


In order to efficiently eliminate the ISI, the UWB channel 

is modeled as a block circulant matrix such that the Fast 

Fourier Transform (FFT) based equalization schemes are 

applied. The FFT-based MMSE equalization eliminates 

the ISI to such an extent that the system performance 

approaches that of an AWGN channel. As the large 

number order of the UWB channel, the FFT-based 

equalization scheme dramatically decreases the 

computational complexity. 

Turbo Equalization for High Mobility 

Communications 

Researchers: Iain Collings 

This project is addressing the problem of cancelling the 

effect of a quickly varying transmission channel, in a way 

which is as near to optimal as is practically possible to 

implement. We have proposed a new adaptive turbo 

equalizer (joint work with Dr L. Davis, Bell Labs) and are 

currently developing analysis to assist with design choices 

such as the trade-off between coding and pilot insertion. 

High Speed ADSL Modems 


Asymmetric Digital Subscriber Line (ADSL) modems are 

capable of sending data at rates up to 20Mbps, over 

standard telephone wires! We are currently developing 

new algorithms for DSL modems, to overcome the 

difficulties associated with sending at such high speeds 

(compared to standard telephone line modems, eg. V.34 

modems). In particular, we have developed new latticebased 

transmission techniques to overcome amplifierclipping. 

This research project is in collaboration with Dr 

I.V.L. Clarkson at the University of Queensland. We are 

also developing a hardware testbed for ADSL using the 

Texas Instruments TMS320C6201 DSP. 

Receiver Design for Multiuser Mobile 

Communications 


Future generations of wireless networks will require 

advanced multi-user receivers to cancel the effect of high 

levels of mobility, interference, and noise. We are 

developing and analyzing a number of aspects of future 

generation receivers, such as iterative and adaptive 

MMSE receivers (joint work with Dr J. Evans at the 

University of Melbourne), and low complexity 

synchronization and equalization techniques. 

Receiver Design for 4G Mobile & Wireless 

Local Area Networks 


Future generation mobile communications and WLANs 

are expected to use transmission technologies such as 

orthogonal frequency division multiplexing (OFDM) and 

multicode multicarrier code division multiple access 

(MC-MC-CDMA). We are developing and analyzing new 

reveiver designs, as well as deriving theoretical 

performance measures for such techniques. 

This is joint work with Prof. M. Honig at North Western 

University, USA. 

Quality of Service in 4G Wireless Network 

Researchers: Guoqiang Mao, Lixiang Xiong 

4G wireless network is going to be a high speed, IP based 

network, supporting a variety of services and seamless 

mobility between different access technologies (e.g. 

wireless LAN, W-CDMA). Providing Quality of Service 

(QoS) demanded by the multimedia services in the 4G 

network is a challenging problem. 

This project will investigate QoS solutions in the 4G 

network. The objective of this research is to provide 

robust and uniform QoS to multimedia services across 

heterogeneous networks in 4G. 

Network Traffic Modelling and Performance 

Analysis in the Presence of Traffic Selfsimilarity 

Researchers: Guoqiang Mao 

It is well known that some characteristics of network 

traffic fall beyond the conventional framework of Markov 

traffic modelling. Despite the recognition of the existence 

of self-similarity, little agreement has been reached on its 

impact on traffic modelling and performance analysis. 

Clearly the impact of self-similarity would not be as 

severe as indicated by some pure theoretical analysis 

considering an infinite timescale. Because it is in a real 

network with limited time-scale range that traffic selfsimilarity 

exists and exerts its impact. 

This project will investigate the impact of traffic selfsimilarity 

by both qualitatively and quantitatively 

determining the finite time-scale range of interest for 

traffic measurements and performance analysis. Then it 

will build a traffic model matching network traffic within 

the finite time-scale range and carry out performance 

analysis accordingly. The research outcome will benefit a 

lot of areas, including traffic measurements, modelling, 

performance analysis and multi-timescale traffic 

engineering. 

Multiple Time Scale Traffic Engineering 


Traffic engineering makes use of a number of different 

traffic control mechanisms. Some examples are active 

queue management, admission control, load balancing 

and routing. These different mechanisms exist, not only 

because they serve different purposes, but also because 

they only operate effectively over one particular network 

timescale, i.e. packet level, burst level and connection 

level. Moreover traffic engineering at each timescale 

works separately without any coordination. A small 

timescale allows traffic engineering to better track traffic 

changes to respond to congestion in a timely manner. 

However, this can cause frequent route changes which 

can deteriorate the performance of the applications 

23


running over the network. In addition, traffic information 

has to be disseminated in the network frequently and this 

puts additional load onto the network. On the other hand, 

a large timescale can provide stable routing which is 

important in maintaining good performance of network 

applications and imposes less burden on the network for 

traffic load information dissemination. However, it cannot 

deal with short term traffic surge. Thus, in choosing 

between a small or large timescale, a tension exists 

between routing stability and capability to cope with 

short-term network congestion. 

The fundamental problem of this dilemma is caused by 

using only one single timescale and can effectively be 

removed if both small timescale and large timescale 

traffic engineering can be unified into one framework as 

proposed here. This project breaks away from the 

traditional traffic engineering paradigm which takes only 

one timescale into account to a new paradigm which takes 

multiple timescales into consideration. In this project, we 

plan to investigate a new architecture where the long term 

traffic control decisions are made centrally while the short 

term ones are made distributedly. A challenging research 

problem is to ensure that these decisions work together to 

enhance the overall network problems rather than 

working against each other. 

Closed-loop Connection Admission Control 

Scheme 


Connection Admission Control (CAC) is a preventive 

traffic and congestion control mechanism. It is essential 

for providing Quality of Service (QoS) supports required 

by multimedia applications. Currently almost all CAC 

schemes are open loop. Its performance relies on accurate 

traffic and network models, accurate model parameters, 

and accurate loss performance analysis. As a quick review 

of the existing literature indicates, no traffic model can be 

claimed to be accurate for all traffic sources (e.g. voice 

traffic, data traffic, video traffic) under all network 

conditions (e.g. heavy traffic or light traffic, LAN or 

WAN). Modelling errors, traffic parameter errors and 

errors in performance analysis are inevitable. An openloop 

CAC scheme lacks the ability to account for these 

errors and adapt to real network environment to achieve 

an optimum performance. 

This project will investigate a novel closed-loop CAC 

scheme where performance feedback is provided to CAC 

scheme to enable it to adapt to real network environment. 

The closed-loop CAC is able to overcome inherent 

drawbacks in an open-loop CAC to achieve better 

performance in a complex, changing network 

environment. 

On-Line Network Quality of Service 

Monitoring 

Researchers: Guoqiang Mao, Yanqiang Luan 

For real-time network applications, e.g. voice, video, QoS 

requirements are very stringent. A prime concern is to 

ensure that there are adequate resources in the network to 

meet the traffic demand or to prioritize the use of 

resources when resources short-falls are unavoidable. 

Network monitoring and estimation have to be performed 

in order to keep abreast of demand. To provide dynamic 

network control and management, On-line monitoring and 

estimation have been employed as opposed to 

conventional off-line testing technique. One potential 

problem for on-line monitoring is that some QoS 

indicators are specified in terms of the probability of 

occurrence of certain rare events. This makes direct 

monitoring method very difficult. The objective of this 

project is to overcome these difficulties and comes up 

with a new scheme that can accurately monitor QoS 

parameters such as traffic loss, delay and jitter on line. 

24 

Staff 


Prof. Branka Vucetic 

A/Prof. Abbas Jamalipour 

Dr. Iain Collings 

Dr. Guoqiang Mao 

Research Staff 

Dr. Yonghui Li 


Dong Pham 


Maree Belleli 


Zhuo Chen 

Lixiang Xiong 

Yanqiang Luan 

Joseph Chueh 

Robert Fry 

Paul Jeffery 

Matthew Peacock 

Agus Santoso 

Qingyang Song 

Chakree Teekapakvisit 

Fei Xin 

Yang Tang 

Rushikesh Kalaspurkar 

Kingsley Allan 

Zhendong Zhou 

Riad Kabbara 

M. Rubaiyat Kibria 

Ehssan Sakhaee 


B. Vucetic, “Pseudo-Random 

Polarization Shift Keying System”, 

Industrial Contract with Polarizone 

Technologies, Malaysia, A$106,300, 


I. Collings and Clarkson, “New 

Lattice Approach for Digital 

Broadband Communications”, ARC 

Discovery Grant, A$150,000, 2004- 

2006. 

I. Collings, “Advanced multi user 

receivers for increased capacity 

broadband communications”,


University of Sydney Competitive 

Research Grant, A$30,000, 2004. 

I. Collings, B. Vucetic with other 

joint Chief Investigators, “Australian 

Communications Research Network 

(ACoRN)”, ARC Special Research 

Initiatives (seed funding for research 

network), A$20,000, 2003. 

I. Collings, “MIMO Wireless 

Communications”, CSIRO industry 

funding, A$16,000, 2003. 

I. Collings, “Adaptive Turbo 

Receivers for Mobile Data 

Communications”, ARC Discovery 


I. Collings, “Wireless 

Communication 

Channel 

Equalization for New Digital Coding 

Techniques”, University of Sydney 

Competitive Research Grant, 


I. Collings, “MIMO Wireless 

Communications”, CSIRO industry 

funding, A$14,000, 2002. 

B. Vucetic and A. Jamalipour, 

“Capacity Enhancement of GSM 

Cellular Network”, ARC SPIRIT, 


A. Jamalipour and B. Vucetic, 

“Transparent Network Architecture 

and Access Technologies for High- 

Speed Wireless Communications”, 

DEST IAP-IST Competitive Grants, 

A$241,000, 2004-2005. 

B. Vucetic, “Novel Multistage & 

Interactive Receivers for Wireless 

Communications Systems”, ARC 

Discovery, A$16,606, 2002-2004. 

B. Vucetic, “Space-time coding and 

receiver structures for high speed 

wireless communications”, ARC 

Linkage, A$174,073, 2003-2005. 

Publications 

Books and Book Chapters 

A.. Jamalipour, “Mobile and wireless 

Internet: Protocols, architectures, and 

services”, Chichester, England: John 

Wiley & Sons, 2003, 482 pp (ISBN 

0-470-84468-X). 

A.. Jamalipour, “Satellite in IP 

networks, in Wiley Encyclopedia of 

Telecommunications”, New York: 

John Wiley & Sons, vol. 4, pp. 2111- 

2122, edited by John G. Proakis, 

2003 (ISBN 0-471-36972-1). 

J. Yuan, B. Vucetic, W. Fing and M. 

Tan, “Design of Cyclic Shift 

Interleavers”, a chapter in Turbo 

Codes, edt. By M. Jezequel and R. 

Pundiah, HPS, 2002. 

B. Vucetic and J. Yuan, “Space-Time 

Coding for High Speed Wireless 

communication System”, John Wiley, 



G. Mao and D. Habibi, “A Cell Loss 

Upper Bound for Heterogeneous On- 

Off Sources with Application to 

Connection Admission Control”, 

Computer Communications, Vol. 25, 

Issue 13, pp. 1172-1184, August, 


G. Mao and D. Habibi, “Loss 

Performance Analysis for 

Heterogeneous ON-OFF Sources 

with Application to Connection 

Admission Control”, IEEE/ACM 

Transactions on Networking, Vol. 10, 

No. 1, pp. 125-138, February, 2002. 

M.R.G. Butler and I.B. Collings, “A 

zero-forcing approximate loglikelihood 

receiver for MIMO bitinterleaved 

coded modulation,” IEEE 

Communications Letters, vol. 8, no. 

2, pp. 105-107, Feb. 2004. 

K. Yu and I.B. Collings, 

“Performance of low complexity 

code acquisition for direct-sequence 

spread spectrum systems," IEE 

Proceedings - Communications, vol. 

150, pp. 453-460, Dec. 2003. 

K. Yu, J.S. Evans, and I.B. Collings, 

“Performance analysis of LMMSE 

receivers for M-ary QAM in 

Rayleigh faded CDMA channels,” 

IEEE Transactions on Vehicular 

Technology, vol. 52, pp. 1242-1253, 

Sep. 2003. 

L.G.F. Trichard, J.S. Evans, and I.B. 

Collings, “Performance analysis and 

parameter optimisation of second 

order linear iterative CDMA 

receivers,” IEEE Transactions on 

Wireless Communications, vol. 2, pp. 

591-600, May 2003. 


Collings, “Large system analysis of 

linear parallel interference 

cancellation,” IEEE Transactions on 

Communications, vol. 50, pp. 1778- 

1786, Nov. 2002. 

I.V.L. Clarkson and I.B. Collings, “A 

new joint coding and modulation 

scheme for channels with clipping,” 

Digital Signal Processing, vol. 12, pp. 

223-241, Apr./Jul. 2002. 

J. Yuan, B. Vucetic and W. Feng, 

“Parallel and Serially Concatenated 

Codes on Fading Channels”, IEEE 

Trans. Commun., vol. 50, pp. 1600- 


W. Feng, J. Yuan and B. Vucetic, “A 

Code Matched Interleaver Design for 

Turbo Codes”, IEEE Trans. 

Commun., vol. 50, pp. 926-937, 2002. 

V.~Ponnampalam and B.~Vucetic, 

“Soft Decision Decoding of Reed- 

Solomon Codes”, IEEE Trans. 

Commun., vol. 50, pp. 1758-1768, 


W. Firmanto, J. Yuan, B. Vucetic, 

"Turbo Codes with Transmit 

Diversity: Performance Analysis and 

Evaluation", IEICE Trans. Commun., 

Vol. E85-B, No. 5, pp. 859-865, May 


W. Firmanto, Z. Chen, B. Vucetic, J. 

Yuan, “Space-time Trellis Coded 

Modulation for Wireless Data 

Communications”, Eurasip Journal 

on Applied Signal Processing, Vol. 5, 

pp 459-470, 2002. 

Z. Chen, B. Vucetic, J. Yuan and K.L. 

Lo, “Space-time Trellis Coded 

Modulation with Three and Four 

Transmit Antennas on Slow Fading 

Channels”, IEEE Commun. Lett., 

Vol. 6, no. 2, pp. 67-69, Feb. 2002. 


Lo, “Space-time Trellis Codes for 8- 

PSK with Two, Three and Four 

Transmit Antennas in Quasi-Static 

Flat Fading Channels”, Electronic 

Letters, UK, vol. 38, p. 462-464, 


25


Z. Chen, B. Vucetic and J. Yuan, 

“Space-time trellis codes with 

transmit antenna selection”, Electron. 

Letter, vol. 39, no. 11, pp. 854-855, 


W. Firmanto, B. Vucetic, J. Yuan, 

“Recursive Space-Time TCM for 

Serial/Parallel Concatenations”, 

IEICE Trans. Commun., Vol. E85-B, 

No. 9, pp. 1846-1848, Sep. 2002. 

Z. Chen, J. Yuan, B. Vucetic, and Z. 

Zhou, “Performance of Alamouti 

scheme with transmit antenna 

selection”, Electronics Letters, vol. 

39, no. 23, pp. 1666-1668, Nov. 2003. 

Yuan, Z. Chen, B. Vucetic and W. 

Firmanto, “Performance Analysis 

and Design of Space-Time Coding 

on Fading Channels”, IEEE 

Transactions on Communications, 

vol. 51, no. 12, pp. 1991-1996, Dec. 


Y. Li, B. Vucetic, A. Santoso and Z. 

Chen, “Weighted Space-Time Trellis 

Codes", Electronics Letters, vol. 39, 

no. 25, pp. 1833-1834, Dec. 2003. 

Santoso, J. Choi, C. Chew Lim and B. 

Vucetic, “Chip Level Decision 

Feedback Equalizer for CDMA 

Downlink with Space-time Coding”, 

Electronics Letters, April 2004. 

Jinghong Guo, Xiheng Hu and 

Branka Vucetic, “Performance of A 

New Digital Code Tracking Loop for 

DSSS Systems in the Presence of 

Doppler Shifts, IEE Proceedings 

Communication, pp202-206, Vol. 

150, N0. 3. June 2003. 

A. Santoso, Y. Li, and B. Vucetic, 

“Weighted Space-time Trellis 

Codes”, Electronics Letters, Vol. 40, 

pp. 54-55, Feb 2004. 

S. Kim and A. Jamalipour, “A flow 

control scheme using broadcast 

information for Internet services in 

multiple beam satellite networks,” 

IEEE Journal on Selected Areas in 

Communications, vol. 22, no. 3, pp. 

482-491, April 2004. 

A. Jamalipour, M. Marchese, H. S. 

Cruickshank, J. Neale, and S. N. 

Verma, “Broadband IP Networks via 

Satellites – Part II,” IEEE Journal on 

Selected Areas in Communications, 

vol. 22, no. 3, pp. 433-437, April 

2004. 

T. Tung and A. Jamalipour, 

“Adaptive directional-aware location 

update strategy,” Wiley International 

Journal of Communication Systems, 

vol. 17, no. 2, pp. 141-161, March 

2004. 

A. Jamalipour, M. Marchese, H. S. 

Cruickshank, J. Neale, and S. N. 

Verma, “Broadband IP Networks via 

Satellites,” IEEE Journal on Selected 

Areas in Communications, vol. 22, 

no. 2, pp. 213-217, February 2004. 

T. Tung and A. Jamalipour, “A novel 

sectional paging strategy for location 

tracking in cellular networks,” IEEE 

Communications Letters, vol. 8, no. 

1, pp. 24-26, January 2004. 

T. Tung and A. Jamalipour, “A 

Kalman-filter based location 

management strategy for cellular 

networks,” IEICE Transactions on 

Communications, vol. E86-B, no. 11, 

pp. 3209-3216, November 2003. 

A. Jamalipour and P. Lorenz, 

“Merging IP and wireless networks,” 

IEEE Wireless Communications 

Magazine, vol. 10, no. 15, October 


A. Jamalipour and J. Kim, 

“Measurement-based admission 

control scheme with priority and 

service classes for application in 

wireless IP networks,” Wiley 

International Journal of 

Communication Systems, vol. 16, no. 

6, pp. 535-551, August 2003. 

A. Jamalipour and J. Chen, “A QoS 

guaranteed routing scheme for 

DiffServ satellite IP networks,” 

Satellite Communication Letters, 

special edition on “Satellite 

Multimedia”, vol. 3, no. 2, pp. 1-13, 

July 2003. 

A. Jamalipour and S. Kim, “On the 

performance of broadband 

applications over satellite,” Satellite 

Communication Letters, special 

edition on “Direct To Home 

Broadcast TV,” vol. 3, no. 1, pp. 1-8, 

March 2003. 

A. Jamalipour and M. Yabusaki, “3G 

mobile technologies and 

experiences,” IEEE Wireless 

Communications Magazine, vol. 10, 

no. 1, pp. 6-8, February 2003. 

J. Chen and A. Jamalipour, “An 

adaptive path routing scheme for 

satellite IP networks,” International 

Journal of Communication Systems 

(Wiley InterScience), Special Issue 

on Wireless Access to the Global 

Internet, vol. 16, no. 1, pp. 5-21, 

February 2003. 

A. Jamalipour and S. Kim, “On the 

performance of broadband 

applications over satellite,” Satellite 

Communications Letters, special 

issue on Direct To Home Broadcast 

TV, vol. 3, no. 1, January 2003. 


G. Mao, “Finite Timescale Range of 

Interest for Self-Similar Traffic 

Measurements, Modelling and 

Performance Analysis”, IEEE 

International Conference on 

Networks, pp.7-12, Sydney, Sep. 


G. Mao and D. Habibi, “Connection 

Admission Control - Closing the 

Loop”, IEEE International 

Conference on Networks, ICON'03, 

September, pp. 373-378, Sydney, 


G. Mao and D. Habibi, “Quality of 

Service Monitoring in Multimedia 

Network”, SPIE Conference on 

Multimedia Computing and 

Networking, pp. 5019-7-1 – 5019-7- 

10, Santa Clara, CA, USA, Jan. 2003. 

D. Habibi and G. Mao, “Scalable 

Liquid Crystal Optical Switches: 

Fiction or Reality” International 

Conference on Optical 

Communications and Networks, pp. 

330-333, Singapore, 2002. 


Lo, “Space-time trellis coded 

modulation on quasi-static fading 

channels”, IEEE ICC'02, New York, 

pp. 1589-1595, June 2002. 

L. Ka, Z. Chen, P. Alexander and B. 

Vucetic, “Layered Space-time 

26


Coding with Joint Iterative Detection, 

Channel Estimation and Decoding”, 

in Proc. Of IEEE ISSSTA'02, Prague, 

Czech Republic, pp. 308-312, Sep. 


K. Lo, S. Marinkovic, Z. Chen, and 

B. Vucetic, “Performance 

Comparison of Layered Space-time 

Codes," Proc. of IEEE ICC'02, New 

York, pp 1382-1387, May 2002. 

H. Yang, D. Hong, C. Kang, B. 

Vucetic, “Constrained Adaptive 

Space-Time Diversity Receivers for 

Multiuser WCDMA Systems”, 

ICC'02, New York, 2002. 

H. Yang, D. Hong, C. Kang, B. 

Vucetic, “A Reduced Rank 

Constrained Adaptive Space-Time 

Interference Canceller for Multiuser 

Multirate WCDMA Systems”, 

VTC'02 Spring Birmingham, May, 


H. Yang, J. Yuan, B. Vucetic, 

“Performance of Space-Time Trellis 

Codes in Frequency Selective 

WCDMA Systems”, VTC'02 Fall, 

Vancouver, Canada, 2003 

Y. Hong, J. Yuan, B. Vucetic and Z. 

Chen, “Design of Space-time Turbo 

Trellis Codes for two, three and four 

transmit antennas”, ICCS 

Proceedings, Singapore, pp 202-206, 


Z. Chen, B. Vucetic, and J. Yuan, 

“Comparison of three closed-loop 

transmit diversity schemes”, in 

Proc IEEE VTC'03 (Spring), Jeju 

Island, Korea, pp. 751-754, Apr. 


Z. Chen, B. Vucetic, J. Yuan, and K. 

L. Lo, “Analysis of transmit antenna 

selection/maximal-ratio combining 

in Rayleigh fading channels”, in Proc. 

IEEE ICCT'03, Beijing, P. R. China, 

Apr. 2003. 

A. Santoso, J. Choi, C.C. Lim and B. 

Vucetic, “A chip level decision 

feedback equalizer for CDMA 

downlink channel with the Alamouti 

transmit diversity scheme”, IEEE 

International Symposium on PIMRC 

Beijing, China, pp. 1322-1326, 2003. 

Z. Chen, B. Vucetic, J. Yuan, and K. 

L. Lo, “Analysis of transmit antenna 

selection/maximal-ratio combining 

in Rayleigh fading channels”, in Proc. 

IEEE ISIT'03, Yokohama, Japan, p. 

94, June 2003. 

A. Ephrath and B. Vucetic, 

“Applications of Space-Time 

Techniques in Radar Systems”, Proc. 

IEEE Radar Conference, April 26-29 

2004. 

I.B. Collings and I.V.L. Clarkson, 

“Low complexity lattice-based low- 

PAR transmission for DSL 

channels,” in Proc. of the IEEE Int. 

Conf. on Global Communications 

(GLOBECOM), Signal Processing 

for Communications Mini- 

Conference, San Francisco, USA, pp. 

2120-2124, December 2003. 

M.J.M. Peacock, I.B. Collings, and 

M.L. Honig, “General asymptotic 

LMMSE SINR and spectral 

efficiency for multi-user multisignature 

MC-CDMA in multipath 

Rayleigh fading,” in Proc. of the 

IEEE Int. Conf. on Global 

Communications (GLOBECOM), 

Communication Theory Mini- 

Conference, San Francisco, USA, pp. 

1882-1886, December 2003. 


Collings, “Optimal Linear Multistage 

Receivers with Unequal Power 

Users,” in Proc. of IEEE Int. Symp. 

on Information Theory (ISIT), 

Yokohama, Japan, p. 390, June 2003. 

I.B. Collings and D.H. Won, “Fully 

Adaptive MLSE Equalizer 

Performance with MPSK Signals”, in 

Proc. of the IEEE Int. Conf. on 

Communications (ICC), Advanced 

Signal Processing for 

Communications Mini-Conference, 

Anchorage, USA, pp. 2370-2374, 

May 2003. 

M.J.M. Peacock and I.B. Collings, 

“Mutual Information Analysis of 

Turbo Equalizers for Fixed and 

Fading Channels”, in Proc. of the 

IEEE Int. Conf. on Communications 

(ICC), Communication Theory Mini- 

Conference, Anchorage, USA, pp. 



M.L. Honig, “Asymptotic SINR 

Analysis of Multi-User MC-CDMA 

in Rayleigh Fading”, in Proc. of the 

IEEE Int. Conf. on Communications 

(ICC), Communication Theory Mini- 

Conference, Anchorage, USA, pp. 


M.J.M. Peacock, I.B. Collings, and I. 

Land, “Performance and design 

tradeoffs for adaptive turboequalizers,” 

in Proc. of Int. Conf. on 

Communication Systems and 

Networks (CSN), Malaga, Spain, 

272-277, September 2002. 


M.L. Honig, “Asymptotic SINR 

analysis of single-user MC-CDMA in 

Rayleigh fading,” in Proc. of Int. 

Symp. on Spread Spectrum 

Technologies and Applications 

(ISSSTA), Prague, Czech Republic, 

pp. 338-342, September 2002. 


Collings, “Optimal linear multistage 

receivers and the recursive large 

system SIR,” in Int. Symp. on 

Information Theory (ISIT), 

Switzerland, p. 21, June 2002. 


Collings, “Optimal linear multistage 

receivers for synchronous CDMA,” 

in IEEE Int. Conf. on 

Communications (ICC), New York, 

USA, pp. 1461-1465, April 2002. 

K. Yu, J.S. Evans, and I.B. Collings, 

“Performance analysis of pilot aided 

QAM for Rayleigh fading channels,” 

in IEEE Int. Conf. on 

Communications (ICC), New York, 

USA, pp. 1731-1735, April 2002. 

K. Yu, J.S. Evans and I.B. Collings, 

“Performance Analysis of MMSE 

receivers for M-ary QAM in 

Rayleigh faded CDMA channels”, in 

the Proc. of the 4 th Australian 

Communications Theory Workshop, 

Melbourne, Australia, pp. 13-18, 


D. H. Won and I.B. Collings, “A 

doubly adaptive MLSE equalizer for 

fast-fading channels,” in 3 rd 

Australian Communications Theory 

Workshop, Canberra, Australia, pp. 

95–99, February 2002. 

M.R. Kibria and I.B. Collings, “An 

EM receiver for fast phase rotating 

27


channels,” in 3rd Australian 


Canberra, Australia, pp. 81–85, 


K. Deenick and I.B. Collings, 

“LDPC decoding with hard decision 

inputs for FSK modems,” in 3rd 

Australian Communications Theory 

Workshop, Canberra, Australia, pp. 

53–57, February 2002. 

I. B. Collings, K. Goonetilleke, 

and L.G.F. Trichard, “Multiuser 

receivers for non-ideal power control 

conditions,” in 3rd Australian 


Canberra, Australia, pp. 1–5, 



“Adaptive location management 

strategy to the distance-based 

location update technique for cellular 

networks,” IEEE Wireless 

Communications and Networking 

Conference (WCNC2004), Atlanta, 

Georgia, USA, March 21-25, 2004. 

R. Fry and A. Jamalipour, “A 

precision predictive call admission 

control in packet switched multiservice 

wireless cellular networks,” 

IEEE Global Telecommunications 

Conference (Globecom2003), San 

Francisco, CA, December 1-5, 2003. 

F. Xin and A. Jamalipour, 

“Correlation effects of delay spikes 

and initial congestion window size 

on TCP performance in wireless 

cellular networks,” 2003 Workshop 

on High Performance Switching and 

Routing, Torino, Italy, June 24 - 28, 


A. Jamalipour, “Next generation 

networks with an expandable and 

flexible architecture,” IEEE 

International Conference on 

Communications (ICC2003), 

Anchorage, Alaska, May 11-15, 2003. 


“Adaptive location management 

strategy combining distance-based 

update and sectional paging 

techniques,” 36th Hawaii 

International Conference on System 

Sciences (HICSS36), Mini-track on 

“Quality of Service in Wireless and 

Mobile Networks,” Big Island of 

Hawaii, January 6 - 9, 2003. 

T. Tung and A. Jamalipour, “A 

Kalman-filter based paging strategy 

for cellular networks,” 36th Hawaii 

International Conference on System 

Sciences (HICSS36), Mini-track on 

“Quality of Service in Wireless and 

Mobile Networks,” Big Island of 

Hawaii, January 6 - 9, 2003. 

28

RESEARCH REPORT 2002 and 2003 SCHOOL OF ELECTRICAL ...

Create successful ePaper yourself

Delete template?

Save as template?