Richard H. Middleton
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View article: Straggler Effect Mitigation for Federated Learning in Cell-Free Massive MIMO
Straggler Effect Mitigation for Federated Learning in Cell-Free Massive MIMO Open
Straggler effect is the main bottleneck in realizing federated learning (FL) in wireless networks. This work proposes a novel user (UE) selection approach to mitigate this effect with UE sampling in cell-free massive multiple-input multipl…
View article: Scalable algorithms for designing CO2 capture and storage infrastructure
Scalable algorithms for designing CO2 capture and storage infrastructure Open
This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature's AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or …
View article: Scalability in Nonlinear Network Systems Affected by Delays and Disturbances
Scalability in Nonlinear Network Systems Affected by Delays and Disturbances Open
This paper is concerned with the study of scalability in nonlinear heterogeneous networks affected by communication delays and disturbances. After formalizing the notion of scalability, we give two sufficient conditions to assess this prop…
View article: Discrete-Time Consensus Networks: Scalability, Grounding and Countermeasures
Discrete-Time Consensus Networks: Scalability, Grounding and Countermeasures Open
We investigate the disruption of discrete-time consensus problems via grounding. Loosely speaking, grounding a network occurs if the state of one agent no longer responds to inputs from other agents and/or changes its dynamics. Then, the a…
View article: Passive momentum observer for mechanical systems
Passive momentum observer for mechanical systems Open
In this paper, we propose a hybrid momentum observer for mechanical systems that has the momentum estimate error as a passive output. It is shown that, in the absence of additional input terms, the proposed observer is exponentially stable…
View article: User Selection Approaches to Mitigate the Straggler Effect for Federated Learning on Cell-Free Massive MIMO Networks.
User Selection Approaches to Mitigate the Straggler Effect for Federated Learning on Cell-Free Massive MIMO Networks. Open
This work proposes UE selection approaches to mitigate the straggler effect for federated learning (FL) on cell-free massive multiple-input multiple-output networks. To show how these approaches work, we consider a general FL framework wit…
View article: Joint Resource Allocation to Minimize Execution Time of Federated Learning in Cell-Free Massive MIMO
Joint Resource Allocation to Minimize Execution Time of Federated Learning in Cell-Free Massive MIMO Open
Due to its communication efficiency and privacy-preserving capability, federated learning (FL) has emerged as a promising framework for machine learning in 5G-and-beyond wireless networks. Of great interest is the design and optimization o…
View article: Cell-Free Massive MIMO for Wireless Federated Learning
Cell-Free Massive MIMO for Wireless Federated Learning Open
This paper proposes a novel scheme for cell-free massive multiple-input multiple-output (CFmMIMO) networks to support any federated learning (FL) framework. This scheme allows each instead of all the iterations of the FL framework to happe…
View article: Scalability in nonlinear network systems affected by delays and disturbances
Scalability in nonlinear network systems affected by delays and disturbances Open
This paper is concerned with the study of scalability in nonlinear heterogeneous networks affected by communication delays and disturbances. After formalizing the notion of scalability, we give two sufficient conditions to assess this prop…
View article: Analysis of Attack via Grounding and Countermeasures in Discrete-Time Consensus Networks
Analysis of Attack via Grounding and Countermeasures in Discrete-Time Consensus Networks Open
We investigate the disruption of discrete-time consensus problems via grounding. Loosely speaking, grounding a network occurs if the state of one agent no longer responds to inputs from other agents and/or changes its dynamics. Then, the a…
View article: Disruption via Grounding and Countermeasures in Discrete-Time Consensus Networks
Disruption via Grounding and Countermeasures in Discrete-Time Consensus Networks Open
We investigate the disruption of discrete-time consensus problems via grounding. Loosely speaking, grounding a network occurs if the state of one agent no longer responds to inputs from other agents and/or changes its dynamics. Then, the a…
View article: Contract Farming in the Mekong Delta's Rice Supply Chain: Insights from an Agent-Based Modeling Study
Contract Farming in the Mekong Delta's Rice Supply Chain: Insights from an Agent-Based Modeling Study Open
We would like to thank Michael Maes and the anonymous reviewers for their insightful and constructive feedback. The first author, H. K. Nguyen, would like to acknowledge support from an Australian Government Research Training Program schol…
View article: The 56th IEEE Conference on Decision and Control [Conference Reports]
The 56th IEEE Conference on Decision and Control [Conference Reports] Open
Presents information on the 56th IEEE Conference on Decision and Control.
View article: Energy-Efficient Design for Downlink Cloud Radio Access Networks
Energy-Efficient Design for Downlink Cloud Radio Access Networks Open
This work aims to maximize the energy efficiency of a downlink cloud radio access network (C-RAN), where data is transferred from a baseband unit in the core network to several remote radio heads via a set of edge routers over capacity-lim…
View article: A port-Hamiltonian approach to the control of nonholonomic systems
A port-Hamiltonian approach to the control of nonholonomic systems Open
In this paper a method of controlling nonholonomic systems within the port-Hamiltonian (pH) framework is presented. It is well known that nonholonomic systems can be represented as pH systems without Lagrange multipliers by considering a r…
View article: Coordinated Control for Low Voltage Ride Through in PMSG Wind Turbines
Coordinated Control for Low Voltage Ride Through in PMSG Wind Turbines Open
This work proposes a control strategy for permanent magnet synchronous generator (PMSG) based wind energy conversion systems (WECSs) to improve low voltage ride through (LVRT) capabilities. The nonlinear relationship between the generator …
View article: Joint Optimization of User Association, Data Delivery Rate and Precoding for Cache-Enabled F-RANs
Joint Optimization of User Association, Data Delivery Rate and Precoding for Cache-Enabled F-RANs Open
This paper considers the downlink of a cache-enabled fog radio access network (F-RAN) with limited fronthaul capacity, where user association (UA), data delivery rate (DDR) and signal precoding are jointly optimized. We formulate a mixed-i…
View article: Matched disturbance rejection for energy-shaping controlled underactuated mechanical systems
Matched disturbance rejection for energy-shaping controlled underactuated mechanical systems Open
In this paper, we present a method of applying integral action to enhance the robustness of energy shaping controllers for underactuated mechanical systems with matched disturbances. Previous works on this problem have required a number of…
View article: New results on disturbance rejection for energy-shaping controlled port-Hamiltonian systems
New results on disturbance rejection for energy-shaping controlled port-Hamiltonian systems Open
In this paper we present a method to robustify energy-shaping controllers for port-Hamiltonian (pH) systems by adding an integral action that rejects unknown additive disturbances. The proposed controller preserves the pH structure and, by…
View article: Matched disturbance rejection for energy-shaping controlled\n underactuated mechanical systems
Matched disturbance rejection for energy-shaping controlled\n underactuated mechanical systems Open
In this paper, we present a method of applying integral action to enhance the\nrobustness of energy shaping controllers for underactuated mechanical systems\nwith matched disturbances. Previous works on this problem have required a\nnumber…
View article: Decentralized control for l2 weak string stability of vehicle platoon
Decentralized control for l2 weak string stability of vehicle platoon Open
In this paper we present a method of bidirectional control of a vehicle string that achieves l2 weak string stability. Previous work required short-range communications between vehicles within the string. Here, we utilise some recent resul…
View article: Vehicular Platoons in cyclic interconnections with constant inter-vehicle spacing
Vehicular Platoons in cyclic interconnections with constant inter-vehicle spacing Open
This paper investigates homogeneous vehicle platoons with cyclic, bi-directional communication maintaining a constant (velocity independent) target inter vehicle spacing. We investigate stability and disturbance amplification if the string…
View article: Joint Optimization of User Association, Data Delivery Rate and Precoding\n for Cache-Enabled F-RANs
Joint Optimization of User Association, Data Delivery Rate and Precoding\n for Cache-Enabled F-RANs Open
This paper considers the downlink of a cache-enabled fog radio access network\n(F-RAN) with limited fronthaul capacity, where user association (UA), data\ndelivery rate (DDR) and signal precoding are jointly optimized. We formulate a\nmixe…
View article: Integral control of port-Hamiltonian systems: non-passive outputs without coordinate transformation
Integral control of port-Hamiltonian systems: non-passive outputs without coordinate transformation Open
In this paper we present a method for the addition of integral action to non-passive outputs of a class of port-Hamiltonian systems. The proposed integral controller is a dynamic extension, constructed from the open loop system, such that …