Papers by Antonio Cantoni
2017 IEEE 85th Vehicular Technology Conference (VTC Spring), 2017
Beam-steering has great potentials for joint communications and sensing, which is becoming a dema... more Beam-steering has great potentials for joint communications and sensing, which is becoming a demanding feature on many emerging platforms such as unmanned aerial vehicles and smart cars. Although beam-steering has been extensively studied for communications and radar sensing respectively, its application in the joint system is not straightforward due to different beamforming requirements by communications and sensing. In this paper, we propose a low-cost system framework which allows seamless operation of communications and sensing, using two small-size steerable analog antenna arrays. We provide system architecture, high-level protocols, detailed signal model, novel beamforming design and advanced 1D compressive sensing algorithms for joint communications and sensing. We also provide preliminary simulation results which validate the effectiveness of the proposed technique in resolving closely located objects.
2017 IEEE 85th Vehicular Technology Conference (VTC Spring), 2017
Beamforming design for millimeter-Wave hybrid array with the subarray structure is very challengi... more Beamforming design for millimeter-Wave hybrid array with the subarray structure is very challenging. There is neither known optimal solution that maximizes the sum rate capacity nor near-optimal solution. This paper proposes some low-complexity user-directed analog radio-frequency (RF) beamforming design schemes. The basic idea is to iteratively allocate different subarrays to different users such that users' channel correlation can be efficiently reduced via RF beamforming. Several new but less efficient schemes are also presented to shed light on RF beamforming design, and to serve as comparisons for the user-directed schemes. Simulation results are provided for these proposed schemes, existing ones in the literature and an upper-bound for hybird array with a fully-connected structure. The user-directed schemes demonstrate significantly better sumrate and BER performance over other schemes, although the gap to the upperbound is still large.
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.
Numerical Algebra, Control and Optimization, 2016
In this paper, we consider the zero-forcing beamforming (ZFBF) under the per-antenna power constr... more In this paper, we consider the zero-forcing beamforming (ZFBF) under the per-antenna power constraints (PAPC). Our objective is to maximize the minimum user information rate. Traditionally, ZFBF under PAPC with a max-min performance measure can be transformed into a second order cone problem and then solved by applying the interior point method. However, it is expensive to realize this design in practice due to high computational complexity per iteration. An alternative low complexity zero-forcing beamformer design is proposed for MU-MIMO systems by applying a dual gradient method. Different from the step size rule in the literature, a backtracking line search is adopted. A numerical example is provided to show the effectiveness of the proposed method.
IEEE Transactions on Communications, 1975
ABSTRACT
2013 IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2013
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.
IET Radar, Sonar & Navigation, 2017
Inverse Synthetic Aperture Radar image formation is a problem that has been studied for many deca... more Inverse Synthetic Aperture Radar image formation is a problem that has been studied for many decades. Despite the effort made by many researchers and practitioners, it is still an open problem as it involves non-trivial aspects both in terms of geometry and scattering mechanisms. In this paper, the authors introduce a new interpretation of classical ISAR signal modelling, based on twodimensional polynomials, providing an alternative perspective that permits the in-depth investigation of the problem of ISAR image formation when using a Fourier Transform based approach. The interpretation of target motion compensation and image autofocus are connected through a mathematical formulation that explains in depth what can and should be compensated in the received signal prior to applying the Fourier Transform and therefore forming the ISAR image.
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.
2017 IEEE 85th Vehicular Technology Conference (VTC Spring), Jun 1, 2017
In this paper, we develop a framework for an innovative perceptive mobile (i.e. cellular) network... more In this paper, we develop a framework for an innovative perceptive mobile (i.e. cellular) network that integrates sensing with communication, and supports new applications widely in transportation, surveillance and environmental sensing. Three types of sensing methods implemented in the base-stations are proposed, using either uplink or downlink multiuser communication signals. The required changes to system hardware and major technical challenges are briefly discussed. We also demonstrate the feasibility of estimating sensing parameters via developing a compressive sensing based scheme and providing simulation results to validate its effectiveness.
Antennas and Propagation, IEEE …, 1986
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.
IEEE Transactions on Communications, 2005
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
2016 10th International Conference on Signal Processing and Communication Systems (ICSPCS), 2016
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Papers by Antonio Cantoni