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Dr Duy Ngo

Lecturer

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

Career Summary

Biography

Duy Trong Ngo came to Australia in 2003 for undergraduate study under the Australian Development Scholarship scheme. In March 2007, he received the B.Eng. degree (with First-class Honours and the University Medal) in Telecommunication Engineering from the University of New South Wales, Sydney. Seeking for more international research experience, he then decided to go to Canada for graduate studies. At the University of Alberta, he worked with Prof. Chinthananda Tellambura and obtained the M.Sc. degree in Electrical Engineering (Communication) in November 2009. In the same year, he moved to Montreal, Quebec to attend McGill University and partly to explore French Canada. Under the supervision of Prof. Tho Le-Ngoc, he received the Ph.D. degree in Electrical Engineering in November 2013. Prior to his Ph.D. defense, he was offered a permanent position at the University of Newcastle, Australia in March 2013, where he has been a Lecturer in Telecommunications with the School of Electrical Engineering and Computer Science since July 2013. During October 2014, he was a Visiting Professor at the University of Alberta, Canada. His broad research interest is in the area of optimisation theory and its applications in wireless communications.

Research Expertise
His primary research expertise is in the area of radio resource allocation and interference management for wireless communications networks. Recent applications include fifth-generation (5G) wireless networks, e.g., small-cell heterogeneous networks, self-organising networks, cognitive radio, energy-efficient communications, wireless energy harvesting and full-duplex relay communications.

Teaching Expertise
Analog and Digital Communications; Electrical Engineering Design; Introduction to Engineering Practices; Wireless Communications.


Collaborations
He maintains active collaborations with several telecommunications research groups in Australia (Australian National University, University of Technology Sydney), Canada (McGill University, University of Alberta) and Finland (Aalto University).


Qualifications

  • PhD (Electrical & Computer Eng), McGill University - Canada
  • Bachelor of Engineering (Telecomunicat Eng)(Hons), University of New South Wales
  • Master of Science (Communications), University of Alberta - Canada

Keywords

  • Algorithm design
  • Convex optimization
  • Distributed computing
  • Radio resource management
  • Wireless communications systems
  • Wireless networks

Fields of Research

Code Description Percentage
080503 Networking and Communications 30
100504 Data Communications 10
100510 Wireless Communications 60

Professional Experience

UON Appointment

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

Academic appointment

Dates Title Organisation / Department
5/10/2014 - 20/10/2014 Visiting Professor University of Alberta
Canada
1/07/2013 - 21/06/2015 Lecturer University of Newcastle
School of Elect Engineering and Computer Science
Australia

Awards

Distinction

Year Award
2007 University Medal
University of New South Wales

Prize

Year Award
2006 NICTA Telecommunications Excellence Award
NICTA (National Information and Communications Technology Australia)

Recipient

Year Award
2013 NSERC Postdoctoral Fellowship
Natural Sciences and Engineering Research Council (NSERC)
2013 FRQNT Postdoctoral Fellowship
Fonds de recherche du Québec - Nature et technologies (FRQNT)

Scholarship

Year Award
2011 Alexander Graham Bell Canada Graduate Scholarship
Government of Canada
2009 Clifford Pang Doctoral Fellowship
McGill University
2009 McGill Engineering Doctoral Award
McGill University
2009 McGill International Doctoral Award
McGill University
2007 Alberta Ingenuity Fund Scholarship
Alberta Ingenuity
2007 iCORE Graduate Scholarship in ICT
Informatics Circle of Research Excellence (iCORE) (former)
2003 Australian Development Scholarship
AusAID (Australian Agency for International Development)
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Publications

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


Book (1 outputs)

Year Citation Altmetrics Link
2014 Ngo DT, Le-Ngoc T, Architectures of Small-Cell Networks and Interference Management, Springer, USA, 121 (2014) [A1]
DOI 10.1007/978-3-319-04822-2

Chapter (2 outputs)

Year Citation Altmetrics Link
2014 Javed MA, Ngo DT, Khan JY, 'Multimedia Communication for Emergency Services in Cooperative Vehicular Ad Hoc Networks', Multimedia Over Cognitive Radio Networks: Algorithms, Protocols and Experiments, CRC Press, Boca Raton, FL 319-346 (2014) [B1]
Co-authors Jamil Khan
2012 Ngo DT, Nguyen DHN, Le-Ngoc T, 'Intercell interference coordination: Towards a greener cellular network', Handbook of green information and communication systems, Academic Press (Elsevier), San Diego, CA / United States 147-182 (2012) [B1]

Journal article (10 outputs)

Year Citation Altmetrics Link
2015 Javed MA, Ngo DT, Khan JY, 'Distributed spatial reuse distance control for basic safety messages in SDMA-based VANETs', Vehicular Communications, 2 27-35 (2015)

The periodic generation and transmission of basic safety messages (BSM) place a heavy burden on the load of a vehicular ad hoc network (VANET), where there also remain multiple pa... [more]

The periodic generation and transmission of basic safety messages (BSM) place a heavy burden on the load of a vehicular ad hoc network (VANET), where there also remain multiple packet collisions undetected due to the hidden terminals. In this paper, we propose a distributed scheme that controls the spatial reuse distance to improve the efficiency of BSM transmissions in space-division multiple access (SDMA) based VANETs. With the proposed SDMA structure, only vehicles located sufficiently far apart are allowed to reuse the same time slot to send their BSMs. The signal interference is thus reduced while the hidden-node problem is essentially alleviated. Multiple transmissions per SDMA road segment or 'cell' are also enabled using the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), giving rise to a much better use of both space and bandwidth. To guarantee that the actual number of BSM transmissions does not exceed the maximum allowable in each SDMA cell, we further devise an adaptive scheme that adjusts the spatial reuse distance in accordance with the vehicle density. Because the global information of vehicle density is not available at individual vehicles, we propose a distributed algorithm that estimates the vehicle density and makes consensus to enhance the accuracy of spatial reuse distance estimation. As the transmission range is controlled accordingly, the mutual interference among the SDMA cells is further reduced. Importantly, the developed control algorithm can be distributively implemented by each vehicle with limited information exchange. To optimize the performance of the proposed solution, we also determine the optimal bandwidth utilization that maximizes the newly-defined criterion termed as 'safe range,' an important figure-of-merit in vehicular safety applications. Simulation results confirm the clear advantages of our proposal over the available approaches in terms of safety range, packet reception rate, end-to-end delay and BSM inter-arrival time in realistic network scenarios.

DOI 10.1016/j.vehcom.2014.12.001
Co-authors Jamil Khan
2014 Ngo DT, Khakurel S, Le-Ngoc T, 'Joint subchannel assignment and power allocation for OFDMA femtocell networks', IEEE Transactions on Wireless Communications, 13 342-355 (2014) [C1]

In this paper, we propose a joint subchannel and power allocation algorithm for the downlink of an orthogonal frequency-division multiple access (OFDMA) mixed femtocell/macrocell ... [more]

In this paper, we propose a joint subchannel and power allocation algorithm for the downlink of an orthogonal frequency-division multiple access (OFDMA) mixed femtocell/macrocell network deployment. Specifically, the total throughput of all femtocell user equipments (FUEs) is maximized while the network capacity of an existing macrocell is always protected. Towards this end, we employ an iterative approach in which OFDM subchannels and transmit powers of base stations (BS) are alternatively assigned and optimized at every step. For a fixed power allocation, we prove that the optimal policy in each cell is to give each subchannel to the user with the highest signal-to-interference-plus-noise ratio (SINR) on that subchannel. For a given subchannel assignment, we adopt the successive convex approximation (SCA) approach and transform the highly nonconvex power allocation problem into a sequence of convex subproblems. In the arithmetic-geometric mean (AGM) approximation, we apply geometric programming to find optimal solutions after condensing a posynomial into a monomial. On the other hand, logarithmic and difference-of-two-concave-functions (D.C.) approximations lead us to solving a series of convex relaxation programs. With the three proposed SCA-based power optimization solutions, we show that the overall joint subchannel and power allocation algorithm converges to some local maximum of the original design problem. While a central processing unit is required to implement the AGM approximation-based solution, each BS locally computes the optimal subchannel and power allocation for its own servicing cell in the logarithmic and D.C. approximation-based solutions. Numerical examples confirm the merits of the proposed algorithm. © 2014 IEEE.

DOI 10.1109/TWC.2013.111313.130645
Citations Scopus - 7Web of Science - 3
2014 Javed M, Ngo D, Khan J, 'A multi-hop broadcast protocol design for emergency warning notification in highway VANETs', EURASIP Journal on Wireless Communications and Networking, 2014 1-15 (2014) [C1]
DOI 10.1186/1687-1499-2014-179
Co-authors Jamil Khan
2012 Ha KH, Ngo DT, Phan A, Hoang TD, 'Nonsmooth optimization for efficient beamforming in cognitive radio multicast transmission', IEEE Transactions on Signal Processing, 60 2941-2951 (2012) [C1]
Citations Scopus - 12
2012 Ngo DT, Le LB, Le-Ngoc T, 'Distributed Pareto-optimal power control for utility maximization in femtocell networks', IEEE Transactions on Wireless Communications, 11 3434-3446 (2012) [C1]
Citations Scopus - 8
2012 Ngo DT, Le LB, Le-Ngoc T, Hossain E, Kim DI, 'Distributed interference management in two-tier CDMA femtocell network', IEEE Transactions on Wireless Communications, 11 979-989 (2012) [C1]
Citations Scopus - 40
2011 Ngo DT, Le-Ngoc T, 'Distributed resource allocation for cognitive radio networks with spectrum-sharing constraints', IEEE Transactions on Vehicular Technology, 60 3436-3449 (2011) [C1]
Citations Scopus - 32Web of Science - 23
2010 Ngo DT, Tellambura C, Nguyen H, 'Resource allocation for OFDMA-based cognitive radio multicast networks with primary user activity consideration', IEEE Transactions on Vehicular Technology, 59 1668-1679 (2010) [C1]
Citations Scopus - 61
2009 Ngo DT, Tellambura C, Nguyen H, 'Efficient resource allocation for OFDMA multicast systems with spectrum-sharing control', IEEE Transactions on Vehicular Technology, 58 4878-4889 (2009) [C1]
Citations Scopus - 28
2008 Ngo DT, Hoang TD, Nguyen H, 'Jointly optimal signature sequences and power allocation for CDMA systems', IEEE Transactions on Wireless Communications, 7 4122-4127 (2008) [C1]
Citations Scopus - 2
Show 7 more journal articles

Conference (15 outputs)

Year Citation Altmetrics Link
2014 Javed MA, Khan JY, Ngo DT, 'Joint space-division multiple access and adaptive rate control for basic safety messages in VANETs', IEEE Wireless Communications and Networking Conference, WCNC (2014) [E1]

In a vehicular ad hoc network (VANET), basic safety messages (BSM) are exchanged among vehicles to provide cooperative awareness and support safety applications. While the periodi... [more]

In a vehicular ad hoc network (VANET), basic safety messages (BSM) are exchanged among vehicles to provide cooperative awareness and support safety applications. While the periodic generation and transmission of such messages already place a heavy burden on the network load, the hidden nodes further complicate the network situation with packet collisions being undetectable. In this paper, we propose a space-division multiple access (SDMA) technique combined with an adaptive rate control mechanism to improve the efficiency of BSM transmissions. With SDMA to reduce the interference among the vehicles and address the hidden-node problem, only vehicles located sufficiently far apart are allowed to reuse the same time slot to send their BSMs. The developed SDMA approach permits multiple transmissions per road segment and uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) in each segment, giving rise to a much better use of both space and bandwidth. To guarantee that the actual number of BSM transmissions does not exceed the maximum allowable, we devise an adaptive scheme that optimally adjusts the individual packet generation rates in accordance to the vehicle density. Toward this end, we find an optimal bandwidth utilization that maximizes the newly-defined metric, termed as 'safety throughput' per vehicle. Such an optimal utilization allows a large number of BSM packets to be generated while maintaining a high reception probability. Our comprehensive simulation results confirm the clear advantages of our proposal over the existing techniques, in terms of safety range, BSM packet inter-arrival time, and safety throughput.

DOI 10.1109/WCNC.2014.6952853
Co-authors Jamil Khan
2014 Javed MA, Khan JY, Ngo DT, 'Multimedia Transmission for Emergency Services in VANETs', VTC Fall 2014, Vancouver, Canada (2014) [E1]
DOI 10.1109/VTCFall.2014.6966065
Co-authors Jamil Khan
2014 Javed MA, Khan JY, Ngo DT, 'A tone-based time-slotted protocol for multi-hop emergency message dissemination in VANETs', 2014 IEEE 79th Vehicular Access Technology (VTC2014 - Spring) Proceedings, Seoul, Korea (2014) [E1]
DOI 10.1109/VTCSpring.2014.7022800
Co-authors Jamil Khan
2014 Le DA, Vu HV, Tran NH, Duong TQ, Ngo DT, 'Numerical calculation of achievable rates for cognitive radio with dynamic frequency hopping under imperfect spectrum sensing', IEEE International Conference on Communications and Electronics Proceedings, Danang, Vietnam (2014) [E1]
2013 Ngo DT, Khakurel S, Le-Ngoc T, 'Distributed subchannel and power allocation for OFDMA-based Femtocell networks', 2013 IEEE 77th Vehicular Technology Conference (VTC Spring) Proceedings, Dresden, DE (2013)
DOI 10.1109/VTCSpring.2013.6692514
2012 Ngo DT, Le LB, Le-Ngoc T, 'Joint utility maximization in two-tier networks by distributed pareto-optimal power control', IEEE Vehicular Technology Conference (2012)

This paper addresses the critical problem of interference management in two-tier networks, where the newly-deployed femtocell users (FUEs) operate in the licensed spectrum owned b... [more]

This paper addresses the critical problem of interference management in two-tier networks, where the newly-deployed femtocell users (FUEs) operate in the licensed spectrum owned by the existing macrocell. A Pareto-optimal power-control algorithm is devised that jointly maximizes the utilities of both macrocell and femtocell networks while robustly guaranteeing the macrocell's quality-of-service (QoS) requirements. After effectively enforcing the minimum signal-to-interference-plus-noise ratios (SINRs) prescribed by the macrocell users (MUEs) with the use of a penalty function, the Pareto- optimal boundary of the strongly-coupling SINR feasible region is characterized. Based upon the specific network utility functions and also the target SINRs of the MUEs, a unique operating SINR point is determined, and transmit power adapted to achieve such a design objective. We prove that the developed algorithm converges to the global optimum, and more importantly, it can be distributively implemented at individual links. Effective mechanisms are also available to flexibly designate the access priority between macrocells and femtocells, as well as to fairly share the system resources among different users. The merits of the proposed approach are verified by numerical examples. © 2012 IEEE.

DOI 10.1109/VTCFall.2012.6399096
2011 Ngo DT, Le LB, Le-Ngoc T, Hossain E, Kim DI, 'Distributed interference management in femtocell networks', IEEE Vehicular Technology Conference (2011)

This paper considers a two-tier cellular network wherein femtocell users, who communicate with their home-owner-deployed base stations, share the same frequency band with macrocel... [more]

This paper considers a two-tier cellular network wherein femtocell users, who communicate with their home-owner-deployed base stations, share the same frequency band with macrocell users by code-division multiple access (CDMA) technology. Since macrocell users have strictly higher priority in accessing the available radio spectrum, their quality-of-service (QoS) performance, expressed in terms of the minimum required signal-to-interference-plus-noise ratio (SINR), should be maintained at all times. Femtocell users, on the other hand, are allowed to exploit residual network capacity for their own communications. In this work, we develop a joint power- and admission-control algorithm for interference management in such two-tier networks. Specifically, throughput-power tradeoff optimization is achieved for femtocell users while all macrocell users being supported with guaranteed QoS requirements whenever feasible. Importantly, the proposed algorithm makes power and admission control decisions in an autonomous and distributive manner with minimal coordination signaling, a desirable feature in two-tier networks where only limited exchange of signaling information can be afforded on backhaul links. Under certain practical conditions, the developed scheme is shown to converge to a stable solution. An effective technique is also proposed to improve the efficiency of such equilibrium in lightly-loaded networks. The performance of our proposed algorithm is demonstrated by numerical results. © 2011 IEEE.

DOI 10.1109/VETECF.2011.6092914
Citations Scopus - 1
2011 Ngo DT, Le LB, Le-Ngoc T, 'Distributed pareto-optimal power control in femtocell networks', IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC'11, Toronto, Ontario, Canada (2011) [E1]
DOI 10.1109/PIMRC.2011.6139914
Citations Scopus - 4
2010 Ngo DT, Le-Ngoc T, 'Distributed Resource Allocation for Cognitive Radio Ad-Hoc Networks with Spectrum-Sharing Constraints', GLOBECOM 2010, Miami, FL (2010)
DOI 10.1109/GLOCOM.2010.5683955
2010 Phan AH, Tuan HD, Kha HH, Ngo DT, 'Nonsmooth optimization for beamforming in cognitive multicast transmission', GLOBECOM - IEEE Global Telecommunications Conference, Miami, FL (2010) [E1]
DOI 10.1109/GLOCOM.2010.5683915
2010 Phan AH, Tuan HD, Kha HH, Ngo DT, 'A reverse convex programming for beamforming in cognitive multicast transmission', Third International Conference on Communications and Electronics 2010 (ICCE), Nha Trang, Vietnam (2010) [E1]
DOI 10.1109/ICCE.2010.5670712
Citations Scopus - 4
2009 Ngo DT, Tellambura C, Nguyen HH, 'Efficient resource allocation for OFDMA multicast systems with fairness consideration', RWS 2009 IEEE Radio and Wireless Symposium, Proceedings, San Diego, CA, United States (2009) [E1]
DOI 10.1109/RWS.2009.4957364
Citations Scopus - 12
2009 Ngo DT, Tellambura C, Nguyen HH, 'Resource allocation for OFDM-based cognitive radio multicast networks', IEEE Wireless Communications and Networking Conference, WCNC, Budapest (2009) [E1]
DOI 10.1109/WCNC.2009.4917948
2007 Phan KT, Tellambura C, Ngo DT, 'Closed-Form SER and Capacity Expressions for Receive Antenna Selection Using Orthogonal Space-Time Block Codes', CCECE 2007, Vancouver, Canada (2007)
DOI 10.1109/CCECE.2007.230
2007 Ngo DT, Tuan HD, Nguyen HH, 'Jointly optimal signature sequences and power allocation for CDMA', ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings (2007)

The problems of designing signature sequences and power allocation policy for code-division multiple access (CDMA) are important and have been the subject of intensive research in... [more]

The problems of designing signature sequences and power allocation policy for code-division multiple access (CDMA) are important and have been the subject of intensive research in recent years. Two different criteria adopted in such design problems are the user capacity and the information-theoretic capacity. Regarding the maximization of the information-theoretic capacity, most of the previous works only consider the optimizations of signature sequences and power allocation separately. In contrast, this paper presents a jointly optimal design of signature sequences and power allocation under the sum power constraint. The proposed design is of closed-form and applicable for the general case of correlated signals and colored noise. Numerical results verify the superiority of the proposed design over the existing ones. © 2007 IEEE.

DOI 10.1109/ICASSP.2007.366766
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Grants and Funding

Summary

Number of grants 5
Total funding $496,200

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


20152 grants / $351,200

Integrated Feedback Control in Future Wireless Communication Networks$350,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Professor Rick Middleton, Dr Robert Karlsson, Doctor Duy Ngo, Dr Torbjorn Wigren, Associate Professor Kaushik Mahata, Ms Ying Sun, Dr Linda Brus
Scheme Linkage Projects
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo G1401341
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

IEEE International Conference on Communications, London UK, 8-12 June 2015.$1,200

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

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Duy Ngo
Scheme Travel Grant
Role Lead
Funding Start 2015
Funding Finish 2015
GNo G1500339
Type Of Funding Internal
Category INTE
UON Y

20141 grants / $5,000

Enabling radio resource management techniques for autonomous wireless networks$5,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Duy Ngo
Scheme New Staff Grant
Role Lead
Funding Start 2014
Funding Finish 2014
GNo G1301354
Type Of Funding Internal
Category INTE
UON Y

20132 grants / $140,000

Enabling optimization techniques for large-scale autonomous wireless networks$80,000

Funding body: Natural Sciences and Engineering Research Council of Canada

Funding body Natural Sciences and Engineering Research Council of Canada
Project Team
Scheme Postdoctoral Fellowship
Role Lead
Funding Start 2013
Funding Finish 2015
GNo
Type Of Funding International - Competitive
Category 3IFA
UON Y

Optimization techniques for large-scale autonomous wireless networks$60,000

Funding body: Fonds de recherche du Québec - Nature et technologies (FRQNT)

Funding body Fonds de recherche du Québec - Nature et technologies (FRQNT)
Project Team
Scheme Postdoctoral Research Fellowship
Role Lead
Funding Start 2013
Funding Finish 2015
GNo
Type Of Funding International - Competitive
Category 3IFA
UON Y
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Research Supervision

Current Supervision

Commenced Research Title / Program / Supervisor Type
2014 Adaptive Packet Transmission Techniques for Energy Efficient and Quality-of-Service Optimized Future WSNs
Computer Engineering, Faculty of Engineering and Built Environment
Co-Supervisor
2014 Delay Aware and Energy Optimized MAC and Routing Protocols for Large Scale Wireless Sensor Networks.
Computer Engineering, Faculty of Engineering and Built Environment
Co-Supervisor
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Dr Duy Ngo

Position

Lecturer
School of Elect Engineering and Computer Science
Faculty of Engineering and Built Environment

Focus area

Electrical and Computer Engineering

Contact Details

Email duy.ngo@newcastle.edu.au
Phone (02) 4921 8947
Fax (02) 4921 6993

Office

Room EAG 19
Building EA Building
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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