Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 11 of 11
Full-Text Articles in Engineering
Transmit Antenna Subset Selection With Power Balancing For High Data Rate Mimo-Ofdm Uwb Systems, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei
Transmit Antenna Subset Selection With Power Balancing For High Data Rate Mimo-Ofdm Uwb Systems, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part A
This paper proposes per-subcarrier transmit antenna subset selection with power balancing for MIMO-OFDM UWB systems to simultaneously improve the system error performance and increase data rates. The deployment of the per-subcarrier antenna subset selection may result in a power unbalance across antennas, which could cause power amplifiers (PAs) to operate in their non-linear regions. To overcome this disadvantage, we formulate a linear optimization problem for the optimal allocation of data subcarriers under a constraint that all antennas have the same number of assigned data symbols. This optimization problem could be applied to systems with an arbitrary number of multiplexed data …
Is 'Community' Important For Community Information Systems?, Alison E. Freeman, Peter Hyland, Mark Freeman, Karlheinz Kautz
Is 'Community' Important For Community Information Systems?, Alison E. Freeman, Peter Hyland, Mark Freeman, Karlheinz Kautz
Faculty of Engineering and Information Sciences - Papers: Part A
Community information systems have the power to transform communities. However, without fully understanding the pre-requisite factors affecting community information system viability, and the complex relationships between these factors, communities struggle to manage such projects in a way that leads to viable systems that deliver real benefits. This paper develops and presents a Model of Community Information System Viability Pre-requisite Factors, based on both existing literature and the study of three community information system projects. This Model represents the generic factors that inform viability (i.e. leadership, active membership, funding, awareness, and system design and functionality), and also considers the impact of …
On The Effects Of Spreading Sequences Over Mimo Systems, Tianle Liu, David A. Stirling, Le Chung Tran, Tadeusz A. Wysocki, Beata J. Wysocki, Prashan Dissanayake Mudiyanselage,, Peter James Vial
On The Effects Of Spreading Sequences Over Mimo Systems, Tianle Liu, David A. Stirling, Le Chung Tran, Tadeusz A. Wysocki, Beata J. Wysocki, Prashan Dissanayake Mudiyanselage,, Peter James Vial
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we develop a Software Defined Radio (SDR) test bed to evaluate the Multiple Access Interference (MAI) effects over SISO and 2 x 1MIMO systems. It can be observed that under asynchronous transmissions, the Gold code leads to the best performance over both systems due to the fact that it has the best correlation properties. We also find the MAI effects in terms of the spreading sequences pairs on MIMO-STS systems. We propose a criterion for selecting promising spreading sequences for MIMO systems. Based on the measured results, we identify pairs of spreading sequences which have improved BER …
Power Sharing Among Multiple Solar Photovoltaic (Pv) Systems In A Radial Distribution Feeder, Brian K. Perera, Philip Ciufo
Power Sharing Among Multiple Solar Photovoltaic (Pv) Systems In A Radial Distribution Feeder, Brian K. Perera, Philip Ciufo
Faculty of Engineering and Information Sciences - Papers: Part A
With an increasing penetration of solar photovoltaic (PV) systems, power distribution grids are becoming more susceptible to network voltage rise. As per applicable standards for grid-integrated PV systems, a PV system must be automatically disconnected from the grid when the terminal voltage of the PV system exceeds a defined maximum voltage. With this directive, in certain situations, PV systems connected at nodes at which the voltage sensitivity is high, may be disconnected from the grid while PV systems connected at less sensitive nodes are continuing to operate. In such a situation, owners whose PV systems are connected at nodes at …
Efficient And Dynamic Key Management For Multiple Identities In Identity-Based Systems, Hua Guo, Chang Xu, Zhoujun Li, Yanqing Yao, Yi Mu
Efficient And Dynamic Key Management For Multiple Identities In Identity-Based Systems, Hua Guo, Chang Xu, Zhoujun Li, Yanqing Yao, Yi Mu
Faculty of Engineering and Information Sciences - Papers: Part A
The traditional identity-based cryptography requires a user, who holds multiple identities, to hold multiple private keys, where each private key is associated with an identity. Managing multiple private/public keys is a heavy burden to a user due to key management and storage. The recent advancement of identity-based cryptography allow a single private key to map multiple public keys (identities); therefore the private key management is simplified. Unfortunately, the existing schemes capturing this feature do not allow dynamic changes of identities and have a large data size proportional to the number of the associated identities. To overcome these problems, in this …
Combined Adaptive Lattice Reduction-Aided Detection And Antenna Shuffling For Dsttd-Ofdm Systems, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei
Combined Adaptive Lattice Reduction-Aided Detection And Antenna Shuffling For Dsttd-Ofdm Systems, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we consider lattice reduction (LR) aided linear detection in a DSTTD-OFDM (double space-time transmit diversity- orthogonal frequency division multiplexing) system with antenna shuffling. We first derive an antenna shuffling criterion for the LR-aided DSTTD-OFDM system. Next, we propose a combined reduced-feedback and adaptive LR algorithm by exploiting the correlation between OFDM subcarriers in the frequency domain. The LR-aided DSTTD OFDM system with this algorithm requires low computational effort for the LR operation and small feedback information. Simulation results show that a significant improvement could be achieved in the proposed system compared to previous (non-LR-aided) systems under spatially …
Spectral Triples For Hyperbolic Dynamical Systems, Michael F. Whittaker
Spectral Triples For Hyperbolic Dynamical Systems, Michael F. Whittaker
Faculty of Engineering and Information Sciences - Papers: Part A
Spectral triples are defined for C-algebras associated with hyperbolic dynam- ical systems known as Smale spaces. The spectral dimension of one of these spectral triples is shown to recover the topological entropy of the Smale space.
Mitigation Of Rooftop Solar Pv Impacts And Evening Peak Support By Managing Available Capacity Of Distributed Energy Storage Systems, Md Jan-E- Alam, Kashem Muttaqi, Darmawan Soetanto
Mitigation Of Rooftop Solar Pv Impacts And Evening Peak Support By Managing Available Capacity Of Distributed Energy Storage Systems, Md Jan-E- Alam, Kashem Muttaqi, Darmawan Soetanto
Faculty of Engineering and Information Sciences - Papers: Part A
A high penetration of rooftop solar photovoltaic (PV) resources into low-voltage (LV) distribution networks creates reverse power-flow and voltage-rise problems. This generally occurs when the generation from PV resources substantially exceeds the load demand during high insolation period. This paper has investigated the solar PV impacts and developed a mitigation strategy by an effective use of distributed energy storage systems integrated with solar PV units in LV networks. The storage is used to consume surplus solar PV power locally during PV peak, and the stored energy is utilized in the evening for the peak-load support. A charging/discharging control strategy is …
The Game Of Information Systems Higher Education, Mark Freeman, Alison E. Freeman
The Game Of Information Systems Higher Education, Mark Freeman, Alison E. Freeman
Faculty of Engineering and Information Sciences - Papers: Part A
With continual changes in higher education in the field of Information Systems (IS), educators are faced with the question: how can we actively engage each learner in a way that encourages self-direction while developing the ability to independently solve problems? The unique learning characteristics of adult learners must each be considered in the design of learning experiences in higher education environments. Gamification - the use of gaming elements in non-gaming contexts - is one source of opportunities for new and interesting learning experiences. Through discussion of 12 major gaming elements, this paper considers whether gamification can create innovative learning environments …
A Reflective Closed Loop Approach For Implementing A New Authentic Assessment-Based Teaching Facility For Electric Motor And Drive Systems, Craig Mclauchlan, Philip Ciufo, Sarath Perera
A Reflective Closed Loop Approach For Implementing A New Authentic Assessment-Based Teaching Facility For Electric Motor And Drive Systems, Craig Mclauchlan, Philip Ciufo, Sarath Perera
Faculty of Engineering and Information Sciences - Papers: Part A
BACKGROUND A new teaching facility with a focus on electric motor and drive systems has been implemented at the University of Wollongong. This facility aspires to use authentic assessment principles to assist in preparing students to properly utilise electric motor and drive systems in professional practice. In an attempt to realise this aim, the implementation of this facility was undertaken using a reflective closedloop approach, addressing the educational outcomes achieved by the students. Setting a holistic scope for the implementation beyond technical concerns to include educational outcomes was critical to the success achieved and has laid the foundation for further …
Application Of Multiple Objective Particle Swarm Optimisation In The Design Of Damaged Offshore Mooring Systems, Zhuo Wang, Timothy J. Mccarthy, M Neaz Sheikh
Application Of Multiple Objective Particle Swarm Optimisation In The Design Of Damaged Offshore Mooring Systems, Zhuo Wang, Timothy J. Mccarthy, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
The offshore hydrocarbon industry operates in more hostile environments as more of marginal fields become economically viable. This means that more floating production systems and economical mooring systems will be needed. With this increase in the use of marginal fields goes the need to re-use vessels and moorings. Floating production systems, such as FPSO's, need to survive extreme events and extreme damage conditions. When one mooring line is damaged, the remaining ones must be sufficient to avoid a complete failure and still protect critical components such as the riser. This paper looks into applying an evolutionary optimisation technique, namely multiple …