IEEE Transactions on Circuits and Systems II: Express Briefs, 2020
The mathematical formulation of pulse width modulation waveform optimization typically involves d... more The mathematical formulation of pulse width modulation waveform optimization typically involves defining an optimality criterion and constraints on the switching times and other pulse width modulation parameters. In this brief, new results are presented in relation to two constraints. One constraint ensures the strict sequential ordering of switching times. The second constraint ensures that the average value of the pulse width modulation waveform over each segment matches the average of the sine wave to be generated over the corresponding segment. The significance of this latter constraint is explored and a number of new optimal pulse width modulation waveforms are defined based on the enforcement of this constraint. Numerical results of the performance of the optimal pulse width modulation waveforms are presented and compared with respect to indicators which are significant in inverters, such as magnitude of the fundamental frequency component, harmonic content and shortest switching interval of the pulse width modulation waveforms.
Over the past 10 years, signal processing and information systems have played a central role in t... more Over the past 10 years, signal processing and information systems have played a central role in the research activities of the Department of Electrical and Computer Engineering at the University of Newcastle. More recently, considerable effort has been devoted to applying and implementing some of these techniques to real system problems. In particular, this paper will discuss the application and implications of our work on adaptive systems to the solution of several significant engineering problems in the areas of energy, communication and computing. Each of these areas will, we believe, play a crucial role in the next 25 years.
Journal of telecommunications and information technology, 2001
Envelope constrained filter design is concerned with the time domain synthesis of a filter whose ... more Envelope constrained filter design is concerned with the time domain synthesis of a filter whose response to a specified input signal stays within prescribed upper and lower bounds and in addition has minimal noise enhancement. In many practical applications, a “soft” approach, such as least mean square, is not the most suitable and it becomes necessary to use “hard” constraints such as the ones considered in the paper. We present an overview of key ideas related to robust continuous time envelope constrained filter design.
Page 1. 320 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. AP-34, NO. 3, MARCH 1986 A New Se... more Page 1. 320 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. AP-34, NO. 3, MARCH 1986 A New Set of Linear Constraints for Broad-Band Time Domain Element Space Processors Abstract-A new set of linear ...
In this paper, we consider the design of finite-impulse response variable digital filters (VDFs) ... more In this paper, we consider the design of finite-impulse response variable digital filters (VDFs) with variable cutoff frequency or variable fractional delay. We propose the design of VDFs with minimum integral squared error and constraints on the maximum error deviation in conjunction with flatness group delay specification or phase constraints. These specifications allow the VDFs to have approximately linear phase, especially in the passband. As these specifications are required to be satisfied for all the filters generated by the VDF with controllable spectral characteristics, the linear constraints resulting from the flatness specification are relaxed to inequality constraints. To make the optimization problem tractable for the phase constrained problem, suitable approximations are employed in the paper. The design problem is formulated as an optimization problem with a quadratic cost function and infinite number of constraints. A numerical scheme with adaptive grid step size is ...
Vision, Image and Signal Processing, IEE Proceedings-, Jun 1, 1995
Many filter design problems in signal processing can be formulated as a quadratic programming pro... more Many filter design problems in signal processing can be formulated as a quadratic programming problem with linear inequality constraints. The authors present new recursive procedures for solving this kind of problem. Using a constraint transcription technique, this inequality constrained quadratic programming problem can be approximated as an unconstrained minimisation problem. Two types of optimisation methods are developed to solve this unconstrained problem in a recursive adjusting manner.
In a direct-conversion transmitter system, the nonideal transfer characteristics of practical ana... more In a direct-conversion transmitter system, the nonideal transfer characteristics of practical analog subsystems can have significant adverse effects on the performance of the transmitter system. While a significant body of research exists on correcting static errors (including gain imbalance, phase errors, and DC offsets) in the analog subsystems, relatively little attention has been paid to the impact of nonideal frequency-dependent
IEEE Transactions on Circuits and Systems II: Express Briefs, 2020
The mathematical formulation of pulse width modulation waveform optimization typically involves d... more The mathematical formulation of pulse width modulation waveform optimization typically involves defining an optimality criterion and constraints on the switching times and other pulse width modulation parameters. In this brief, new results are presented in relation to two constraints. One constraint ensures the strict sequential ordering of switching times. The second constraint ensures that the average value of the pulse width modulation waveform over each segment matches the average of the sine wave to be generated over the corresponding segment. The significance of this latter constraint is explored and a number of new optimal pulse width modulation waveforms are defined based on the enforcement of this constraint. Numerical results of the performance of the optimal pulse width modulation waveforms are presented and compared with respect to indicators which are significant in inverters, such as magnitude of the fundamental frequency component, harmonic content and shortest switching interval of the pulse width modulation waveforms.
Over the past 10 years, signal processing and information systems have played a central role in t... more Over the past 10 years, signal processing and information systems have played a central role in the research activities of the Department of Electrical and Computer Engineering at the University of Newcastle. More recently, considerable effort has been devoted to applying and implementing some of these techniques to real system problems. In particular, this paper will discuss the application and implications of our work on adaptive systems to the solution of several significant engineering problems in the areas of energy, communication and computing. Each of these areas will, we believe, play a crucial role in the next 25 years.
Journal of telecommunications and information technology, 2001
Envelope constrained filter design is concerned with the time domain synthesis of a filter whose ... more Envelope constrained filter design is concerned with the time domain synthesis of a filter whose response to a specified input signal stays within prescribed upper and lower bounds and in addition has minimal noise enhancement. In many practical applications, a “soft” approach, such as least mean square, is not the most suitable and it becomes necessary to use “hard” constraints such as the ones considered in the paper. We present an overview of key ideas related to robust continuous time envelope constrained filter design.
Page 1. 320 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. AP-34, NO. 3, MARCH 1986 A New Se... more Page 1. 320 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. AP-34, NO. 3, MARCH 1986 A New Set of Linear Constraints for Broad-Band Time Domain Element Space Processors Abstract-A new set of linear ...
In this paper, we consider the design of finite-impulse response variable digital filters (VDFs) ... more In this paper, we consider the design of finite-impulse response variable digital filters (VDFs) with variable cutoff frequency or variable fractional delay. We propose the design of VDFs with minimum integral squared error and constraints on the maximum error deviation in conjunction with flatness group delay specification or phase constraints. These specifications allow the VDFs to have approximately linear phase, especially in the passband. As these specifications are required to be satisfied for all the filters generated by the VDF with controllable spectral characteristics, the linear constraints resulting from the flatness specification are relaxed to inequality constraints. To make the optimization problem tractable for the phase constrained problem, suitable approximations are employed in the paper. The design problem is formulated as an optimization problem with a quadratic cost function and infinite number of constraints. A numerical scheme with adaptive grid step size is ...
Vision, Image and Signal Processing, IEE Proceedings-, Jun 1, 1995
Many filter design problems in signal processing can be formulated as a quadratic programming pro... more Many filter design problems in signal processing can be formulated as a quadratic programming problem with linear inequality constraints. The authors present new recursive procedures for solving this kind of problem. Using a constraint transcription technique, this inequality constrained quadratic programming problem can be approximated as an unconstrained minimisation problem. Two types of optimisation methods are developed to solve this unconstrained problem in a recursive adjusting manner.
In a direct-conversion transmitter system, the nonideal transfer characteristics of practical ana... more In a direct-conversion transmitter system, the nonideal transfer characteristics of practical analog subsystems can have significant adverse effects on the performance of the transmitter system. While a significant body of research exists on correcting static errors (including gain imbalance, phase errors, and DC offsets) in the analog subsystems, relatively little attention has been paid to the impact of nonideal frequency-dependent
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