Explanipedia

Energy-Efficient Federated Learning with Relay-Assisted Aggregation in IIoT Networks Open

Hamid Reza Hashempour, Mostafa Nozari, Gilberto Berardinelli, Yanjiao Li, Jie Zhang , et al. · 2025

This paper presents an energy-efficient transmission framework for federated learning (FL) in industrial Internet of Things (IIoT) environments with strict latency and energy constraints. Machinery subnetworks (SNs) collaboratively train a…

Fairness Designs for Load Balancing Optimization in Satellite-Cell-Free Massive MIMO Systems Open

Ngo Tran Anh Thu, N. Lam, Hien Quoc Ngo, Symeon Chatzinotas, Huỳnh Thị Thanh Bình · 2025

Space-ground communication systems are important in providing ubiquitous services in a large area. This paper considers the fairness designs under a load-balancing framework with heterogeneous receivers comprising access points (APs) and a…

Cluster-wise processing in fronthaul-aware cell-free massive MIMO systems Open

Zahra Mobini, Ahmet Gokceoglu, Li Wang, Gunnar Peters, Hyundong Shin , et al. · 2025

We exploit a general cluster-based network architecture for a fronthaul-limited user-centric cell-free massive multiple-input multiple-output (CF-mMIMO) system under different degrees of cooperation among the access points (APs) to achieve…

Hybrid centralized-distributed precoding in fronthaul-constrained CF-mMIMO systems Open

Zahra Mobini, Hien Quoc Ngo, Ardavan Rahimian, Anvar Tukmanov, Dave Townend , et al. · 2025

We investigate a fronthaul-limited cell-free massive multiple-input multiple-output (CF-mMIMO) system and propose a hybrid centralized-distributed precoding strategy that dynamically adapts to varying fronthaul and spectral efficiency (SE)…

RIS-Assisted XL-MIMO for Near-Field and Far-Field Communications Open

Xiaomin Cao, Mohammadali Mohammadi, Hien Quoc Ngo, Hyundong Shin, Michail Matthaiou · 2025

We consider a reconfigurable intelligent surface (RIS)-assisted extremely large-scale multiple-input multiple-output (XL-MIMO) downlink system, where an XL-MIMO array serves two groups of single-antennas users, namely near-field users (NFU…

Energy Efficiency for Massive MIMO Integrated Sensing and Communication Systems Open

Huy T. Nguyen, Van‐Dinh Nguyen, Nhan T. Nguyen, Nguyen Cong Luong, Vo Nguyen Quoc Bao , et al. · 2025

This paper explores the energy efficiency (EE) of integrated sensing and communication (ISAC) systems employing massive multiple-input multiple-output (mMIMO) techniques to leverage spatial beamforming gains for both communication and sens…

Salmonella typhimurium co-expressing cytolysin A and hyaluronidase suppresses tumor growth and metastasis Open

Jung‐Joon Min, Khuynh Van Nguyen, Dinh-Huy Nguyen, Hien Quoc Ngo, Sung-Hwan You , et al. · 2025

Recently, various attenuated bacteria have been studied as cancer therapies due to their unique characteristics, which include tumor-targeting bioactivity and immunogenicity. Previously, we reported a Salmonella typhimurium strain, CNC018,…

Fairness Designs for Load Balancing Optimization in Satellite-Cell-Free Massive MIMO Systems Open

Trinh Van Chien, Ngo Tran Anh Thu, N. Lam, Hien Quoc Ngo, Symeon Chatzinotas , et al. · 2025

peer reviewed

Joint AP Selection and Power Allocation for Unicast–Multicast Cell-Free Massive MIMO Open

Mustafa S. Abbas, Zahra Mobini, Hien Quoc Ngo, Hyundong Shin, Michail Matthaiou · 2025

Joint AP Selection and Power Allocation for Unicast-Multicast Cell-Free Massive MIMO Open

Mustafa S. Abbas, Zahra Mobini, Hien Quoc Ngo, Hyundong Shin, Michail Matthaiou · 2025

Joint unicast and multicast transmissions are becoming increasingly important in practical wireless systems, such as Internet of Things networks. This paper investigates a cell-free massive multiple-input multiple-output system that simult…

Near-Field Energy Harvesting Using XL-MIMO Over Non-Stationary Channels Open

Muhammad Zeeshan Mumtaz, Mohammadali Mohammadi, Hien Quoc Ngo, Michail Matthaiou · 2025

This paper explores the maximization of the harvested power efficiency (HPE) in a modular extremely large multiple-input multiple-output (XL-MIMO) system, which supports energy harvesting (EH) for near-field users. These users are located …

Near-Field SWIPT Using XL-MIMO: Power Allocation and Subarray Activation Open

Muhammad Zeeshan Mumtaz, Mohammadali Mohammadi, Hien Quoc Ngo, Michail Matthaiou · 2025

This paper investigates the simultaneous wireless information and power transfer (SWIPT) capability of a modular extremely large multiple-input multiple-output (XL-MIMO) system, in the context of power consumption (PC) efficiency. The netw…

Fronthaul-Aware User-Centric Generalized Cell-Free Massive MIMO Systems Open

Zahra Mobini, Ahmet Gokceoglu, Li Wang, Gunnar Peters, Hien Quoc Ngo · 2025

We consider fronthaul-limited generalized zeroforcing-based cell-free massive multiple-input multiple-output (CF-mMIMO) systems with multiple-antenna users and multipleantenna access points (APs) relying on both cooperative beamforming (CB…

Cell-Free Massive MIMO-Assisted SWIPT for IoT Networks Open

Mohammadali Mohammadi, Le‐Nam Tran, Zahra Mobini, Hien Quoc Ngo, Michail Matthaiou · 2025

This paper studies cell-free massive multiple-input multiple-output (CF-mMIMO) systems that underpin simultaneous wireless information and power transfer (SWIPT) for separate information users (IUs) and energy users (EUs) in Internet of Th…

Low-resolution compressed sensing and beyond for communications and sensing: Trends and opportunities Open

Geethu Joseph, Venkata Gandikota, Ayush Bhandari, Junil Choi, In-Soo Kim , et al. · 2025

Generalized Tensor-Aided Channel Estimation for Hardware Impaired Device Identification Open

Qi Wu, Zeping Sui, Hien Quoc Ngo, Qun Wan, Michail Matthaiou · 2025

In this paper, we investigate the joint generalized channel estimation and device identification problem in Internet of Things (IoT) networks {under multipath propagation}. To fully utilize the received signal, we decompose the generalized…

How to Proactively Monitor Untrusted Communications with Cell-Free Massive MIMO? Open

Isabella W. G. da Silva, Zahra Mobini, Hien Quoc Ngo, Hyundong Shin, Michail Matthaiou · 2025

This paper studies a cell-free massive multiple-input multiple-output (CF-mMIMO) proactive monitoring system in which multiple multi-antenna monitoring nodes (MNs) are assigned to either observe the transmissions from an untrusted transmit…

Cell-Free Massive MIMO SWIPT with Beyond Diagonal Reconfigurable Intelligent Surfaces Open

Duc Thien Hua, Mohammadali Mohammadi, Hien Quoc Ngo, Michail Matthaiou · 2025

We investigate the integration of beyond diagonal reconfigurable intelligent surfaces (BDRISs) into cell free massive multiple input multiple output (CFmMIMO) systems to enhance simultaneous wireless information and power transfer (SWIPT).…

Performance Analysis and Power Allocation for Massive MIMO ISAC Systems Open

Nhan T. Nguyen, Van‐Dinh Nguyen, Hieu V. Nguyen, Hien Quoc Ngo, A. Lee Swindlehurst , et al. · 2025

Cell-Free Massive MIMO With Multiple Active Eavesdroppers Open

Yasseen Sadoon Atiya, Zahra Mobini, Hien Quoc Ngo, Michail Matthaiou · 2025

This paper investigates the secrecy performance of cell-free massive MIMO (CF-mMIMO) systems in the presence of active spoofing attacks by multiple eavesdroppers (Eves). Each Eve conducts a spoofing attack on a different legitimate user du…

Cell-Free Full-Duplex Communication -- An Overview Open

Diluka Galappaththige, Mohammadali Mohammadi, Hien Quoc Ngo, Michail Matthaiou, Chintha Tellambura · 2024

Cell-free (CF) architecture and full-duplex (FD) communication are leading candidates for next-generation wireless networks. The CF framework removes cell boundaries in traditional cell-based systems, thereby mitigating inter-cell interfer…

Performance Analysis and Power Allocation for Massive MIMO ISAC Systems Open

Nhan T. Nguyen, Van‐Dinh Nguyen, Hieu V. Nguyen, Hien Quoc Ngo, A. Lee Swindlehurst , et al. · 2024

Integrated sensing and communications (ISAC) is envisioned as a key feature in future wireless communications networks. Its integration with massive multiple-input-multiple-output (MIMO) techniques promises to leverage substantial spatial …

Multi-Static Cell-Free Massive MIMO ISAC: Performance Analysis and Power Allocation Open

Nhan T. Nguyen, Tianyu Fang, Hien Quoc Ngo, Markku Juntti · 2024

In this work, we consider a cell-free massive multiple-input multiple-output (MIMO) integarted sensing and communications (ISAC) system with maximum-ratio transmission schemes combined with multistatic radar-type sensing. Our focus lies on…

Distributed Graph Neural Network Design for Sum Ergodic Spectral Efficiency Maximization in Cell-Free Massive MIMO Open

Xuan Tung Nguyen, Trinh Van Chien, Hien Quoc Ngo, Won–Joo Hwang · 2024

This paper proposes a distributed learning-based framework to tackle the sum ergodic rate maximization problem in cell-free massive multiple-input multiple-output (MIMO) systems by utilizing the graph neural network (GNN). Different from c…

Active and Passive Beamforming Designs for SER Minimization in RIS-Assisted MIMO Systems Open

Trinh Van Chien, Bui Trong Duc, Ho Viet Duc Luong, Huỳnh Thị Thanh Bình, Hien Quoc Ngo , et al. · 2024

This research exploits the applications of reconfigurable intelligent surface (RIS)-assisted multiple input multiple output (MIMO) systems, specifically addressing the enhancement of communication reliability with modulated signals. Specif…

Anti-Malicious ISAC Using Proactive Monitoring Open

Zonghan Wang, Zahra Mobini, Hien Quoc Ngo, Michail Matthaiou · 2024

In this paper, we investigate proactive monitoring to mitigate malicious activities in integrated sensing and communication (ISAC) systems. Our focus is on a scenario where a cell-free massive multiple-input multiple-output (CF-mMIMO) arch…

CSI Acquisition in Cell-Free Massive MIMO Surveillance Systems Open

Isabella W. G. da Silva, Zahra Mobini, Hien Quoc Ngo, Michail Matthaiou · 2024

We consider a cell-free massive multiple-input multiple-output (CF-mMIMO) surveillance system, in which multiple multi-antenna monitoring nodes (MNs) are deployed in either observing or jamming mode to disrupt the communication between a m…

Unicast-Multicast Cell-Free Massive MIMO: Gradient-Based Resource Allocation Open

Mustafa S. Abbas, Zahra Mobini, Hien Quoc Ngo, Michail Matthaiou · 2024

We consider a cell-free massive multiple-input multiple-output (CF-mMIMO) system with joint unicast and multi-group multicast transmissions. We derive exact closed-form expressions for the downlink achievable spectral efficiency (SE) of bo…

Ten Years of Research Advances in Full-Duplex Massive MIMO Open

Mohammadali Mohammadi, Zahra Mobini, Hien Quoc Ngo, Michail Matthaiou · 2024

We present an overview of ongoing research endeavors focused on in-band full-duplex (IBFD) massive multiple-input multiple-output (MIMO) systems and their applications. In response to the unprecedented demands for mobile traffic in concurr…

Energy Harvesting Characterization in Cell-Free Massive MIMO Using Markov Chains Open

Muhammad Zeeshan Mumtaz, Mohammadali Mohammadi, Hien Quoc Ngo, Michail Matthaiou · 2024

This paper explores a discrete energy state transition model for energy harvesting (EH) in cell-free massive multiple-input multiple-output (CF-mMIMO) networks. Multiple-antenna access points (APs) provide wireless power and information to…

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