94 citations · 280 across the 25 of their papers we have counts for
25 papers
Improved Soft-k-Means Clustering Algorithm for Balancing Energy Consumption in Wireless Sensor Networks
Botao Zhu, Ebrahim Bedeer, Ha H. Nguyen +2
Energy load balancing is an essential issue in designing wireless sensor networks (WSNs). Clustering techniques are utilized as energy-efficient methods to balance the network ener…
D2D-aided LoRaWAN LR-FHSS in Direct-to-Satellite IoT Networks
Alireza Maleki, Ha H. Nguyen, Ebrahim Bedeer +1
In this paper, we present a device-to-device (D2D) transmission scheme for aiding long-range frequency hopping spread spectrum (LR-FHSS) LoRaWAN protocol with application in direct…
Bit-Interleaved Coded Energy-Based Modulation with Iterative Decoding
Ali Fazeli, Ha H. Nguyen, Halim Yanikomeroglu
This paper develops a low-complexity near-optimal non-coherent receiver for a multi-level energy-based coded modulation system. Inspired by the turbo processing principle, we incor…
Multi-level Design for Multiple-Symbol Non-Coherent Unitary Constellations for Massive SIMO Systems
Son T. Duong, Ha H. Nguyen, Ebrahim Bedeer
This paper investigates non-coherent detection of single-input multiple-output (SIMO) systems over block Rayleigh fading channels. Using the Kullback-Leibler divergence as the desi…
RIS-Aided Cell-Free Massive MIMO Systems: Joint Design of Transmit Beamforming and Phase Shifts
Si-Nian Jin, Dian-Wu Yue, Ha H. Nguyen
This paper studies RIS-aided cell-free massive MIMO systems, where multiple RISs are deployed to assist the communication between multiple access points (APs) and multiple users, w…
Concurrent Transmission and Multiuser Detection of LoRa Signals
The Khai Nguyen, Ha H. Nguyen, Ebrahim Bedeer
This paper investigates a new model to improve the scalability of low-power long-range (LoRa) networks by allowing multiple end devices (EDs) to simultaneously communicate with mul…
Angle Estimation for Terahertz Ultra-Massive MIMO-Based Space-to-Air Communications
Anwen Liao, Zhen Gao, Yang Yang +3
This paper investigates terahertz ultra-massive (UM)-MIMO-based angle estimation for space-to-air communications, which can solve the performance degradation problem caused by the…
UAV Trajectory Planning in Wireless Sensor Networks for Energy Consumption Minimization by Deep Reinforcement Learning
Botao Zhu, Ebrahim Bedeer, Ha H. Nguyen +2
Unmanned aerial vehicles (UAVs) have emerged as a promising candidate solution for data collection of large-scale wireless sensor networks (WSNs). In this paper, we investigate a U…
Performance Improvement of LoRa Modulation with Signal Combining and Semi-Coherent Detection
The Khai Nguyen, Ha H. Nguyen, Ebrahim Bedeer
In this paper, we investigate performance improvements of low-power long-range (LoRa) modulation when a gateway is equipped with multiple antennas. We derive the optimal decision r…
Frequency-Shift Chirp Spread Spectrum Communications with Index Modulation
Muhammad Hanif, Ha H. Nguyen
This paper introduces a novel frequency-shift chirp spread spectrum (FSCSS) system with index modulation (IM). By using combinations of orthogonal chirp signals for message represe…
Performance Analysis and Optimization of Bidirectional Overlay Cognitive Radio Networks with Hybrid-SWIPT
Addanki Prathima, Devendra Singh Gurjar, Ha H. Nguyen +1
This paper considers a cooperative cognitive radio network with two primary users (PUs) and two secondary users (SUs) that enables two-way communications of primary and secondary s…
Wireless Information and Power Transfer for IoT Applications in Overlay Cognitive Radio Networks
Devendra Singh Gurjar, Ha H. Nguyen, Hoang D. Tuan
This paper proposes and investigates an overlay spectrum sharing system in conjunction with the simultaneous wireless information and power transfer (SWIPT) to enable communication…
Performance of Wireless Powered Cognitive Radio Sensor Networks With Nonlinear Energy Harvester
Devendra Singh Gurjar, Ha H. Nguyen, Prabina Pattanayak
This letter analyzes the performance of simultaneous wireless information-and-power transfer (SWIPT) in an overlay cognitive radio network (CRN) under Nakagami- fading. A pair o…
mmWave Doubly-Massive-MIMO Communications Enhanced with an Intelligent Reflecting Surface
Dian-Wu Yue, Ha H. Nguyen, Yu Sun
As a means to control wireless propagation environments, the use of emerging and novel intelligent reflecting surfaces (IRS) is envisioned to enhance and broaden many applications…
Multisensor Data Fusion for Water Quality Monitoring using Wireless Sensor Networks
Ebrahim Karami, Francis M. Bui, Ha H. Nguyen
In this paper, the application of hierarchical wireless sensor networks in water quality monitoring is investigated. Adopting a hierarchical structure, the set of sensors is divide…
Multiplexing Analysis of Millimeter-Wave Massive MIMO Systems
Dian-Wu Yue, Ha H. Nguyen, Shuai Xu
This paper is concerned with spatial multiplexing analysis for millimeter-wave (mmWave) massive MIMO systems. For a single-user mmWave system employing distributed antenna subarray…
Diversity Analysis of Millimeter-Wave Massive MIMO Systems
Dian-Wu Yue, Shuai Xu, Ha H. Nguyen
This paper is concerned with asymptotic diversity analysis for millimeter-wave (mmWave) massive MIMO systems. First, for a single-user mmWave system employing distributed antenna s…
Differential Amplify-and-Forward Relaying Using Linear Combining in Time-Varying Channels
M. R. Avendi, Ha H. Nguyen, Dac-Binh Ha
Differential encoding and decoding can be employed to circumvent channel estimation in wireless relay networks. This article studies differential amplify-and-forward relaying using…
Differential Dual-Hop Relaying under User Mobility
M. R. Avendi, Ha H. Nguyen
This paper studies dual-hop amplify-and-forward relaying system employing differential encoding and decoding over time-varying Rayleigh fading channels. First, the convectional "tw…
Multiple-Symbol Differential Detection for Distributed Space-Time Coding
M. R. Avendi, Ha H. Nguyen, Nguyen Quoc-Tuan
Differential distributed space-time coding (D-DSTC) technique has been considered for relay networks to provide both diversity gain and high throughput in the absence of channel st…
Selection Combining for Differential Amplify-and-Forward Relaying Over Rayleigh-Fading Channel
M. R. Avendi, Ha H. Nguyen
This paper proposes and analyses selection combining (SC) at the destination for differential amplify-andforward (D-AF) relaying over slow Rayleigh-fading channels. The selection c…
Performance of Differential Amplify-and-Forward Relaying in Multi-Node Wireless Communications
M. R. Avendi, Ha H. Nguyen
This paper is concerned with the performance of differential amplify-and-forward (D-AF) relaying for multi-node wireless communications over time-varying Rayleigh fading channels.…
Performance of Selection Combining for Differential Amplify-and-Forward Relaying Over Time-Varying Channels
M. R. Avendi, Ha H. Nguyen
Selection combining (SC) at the destination for differential amplify-and-forward (AF) relaying is attractive as it does not require channel state information as compared to the sem…
Differential Amplify-and-Forward Relaying in Time-Varying Rayleigh Fading Channels
M. R. Avendi, Ha H. Nguyen
This paper considers the performance of differential amplify-and-forward (D-AF) relaying over time-varying Rayleigh fading channels. Using the auto-regressive time-series model to…