Jung-Chieh Chen
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View article: Dynamic Placement of Pinching Antennas for Multicast MU-MISO Downlinks
Dynamic Placement of Pinching Antennas for Multicast MU-MISO Downlinks Open
Within the surface-wave communication paradigm, pinching-antenna systems employ dielectric waveguides as both transmission media and reconfigurable radiators, enabling dynamic antenna repositioning to mitigate path-loss limitations inheren…
View article: Beamforming Design for Dynamic Metasurface Antennas-Based Massive Multiuser MISO Downlink Systems
Beamforming Design for Dynamic Metasurface Antennas-Based Massive Multiuser MISO Downlink Systems Open
This study addresses a massive multiuser multiple-input single-output downlink system with a base station equipped with dynamic metasurface antennas (DMAs) serving single-antenna users. Our goal is to jointly optimize the transmit precoder…
View article: Optimizing D2D Communication With Practical STAR-RIS and Irregular Configurations
Optimizing D2D Communication With Practical STAR-RIS and Irregular Configurations Open
Device-to-device (D2D) communication offers significant potential for future wireless networks but faces challenges such as limited range, signal blockage, and interference. Reconfigurable intelligent surfaces (RISs) can mitigate these iss…
View article: Tuning atom-field interaction via phase shaping
Tuning atom-field interaction via phase shaping Open
A coherent electromagnetic field can be described by its amplitude, frequency, and phase. All these properties can influence the interaction between the field and an atom. Here we demonstrate the phase shaping of microwaves that are scatte…
View article: A Projected Gradient Descent Algorithm for Designing Low-Resolution Finite-Alphabet Equalizers in All-Digital Massive MU-MIMO Communication Systems
A Projected Gradient Descent Algorithm for Designing Low-Resolution Finite-Alphabet Equalizers in All-Digital Massive MU-MIMO Communication Systems Open
Incorporating low-resolution finite-alphabet equalizers into all-digital base station architectures is a promising approach to enhance energy efficiency and cost-effectiveness in massive multi-user multiple-input multiple-output uplink sys…
View article: Capacity Improvement for Intelligent Reflecting Surface-Assisted Wireless Systems With a Small Portion of Active Elements
Capacity Improvement for Intelligent Reflecting Surface-Assisted Wireless Systems With a Small Portion of Active Elements Open
In this study, the use of intelligent reflecting surfaces (IRSs) to improve the capacity of a multi-user multiple-input-single-output downlink system is investigated. Unlike existing IRS-assisted wireless systems equipped with entirely pas…
View article: IEEE Wireless Communications Letters
IEEE Wireless Communications Letters Open
View article: Constructive Interference-Based Symbol-Level Precoding Design for Millimeter-Wave Massive Multiuser MIMO Systems With Hardware-Efficient Hybrid Precoding Architecture
Constructive Interference-Based Symbol-Level Precoding Design for Millimeter-Wave Massive Multiuser MIMO Systems With Hardware-Efficient Hybrid Precoding Architecture Open
This study considers the constructive interference-based symbol-level precoding design problem in millimeter-wave massive multiuser multiple-input multiple-output systems with hybrid analog-and-digital precoding architecture. In contrast t…
View article: Landau-Zener-Stückelberg-Majorana interferometry of a superconducting qubit in front of a mirror
Landau-Zener-Stückelberg-Majorana interferometry of a superconducting qubit in front of a mirror Open
We investigate the Landau-Zener-Stuckelberg-Majorana interferometry of a\nsuperconducting qubit in a semi-infinite transmission line terminated by a\nmirror. The transmon-type qubit is at the node of the resonant electromagnetic\n(EM) fiel…
View article: Large Collective Lamb Shift of Two Distant Superconducting Artificial Atoms
Large Collective Lamb Shift of Two Distant Superconducting Artificial Atoms Open
Virtual photons can mediate interaction between atoms, resulting in an energy shift known as a collective Lamb shift. Observing the collective Lamb shift is challenging, since it can be obscured by radiative decay and direct atom-atom inte…
View article: Joint Quantized Constant Envelope Precoding and Antenna Selection for Massive MU-MIMO Downlink Systems Using Higher-Order QAM
Joint Quantized Constant Envelope Precoding and Antenna Selection for Massive MU-MIMO Downlink Systems Using Higher-Order QAM Open
This paper introduces the antenna selection (AS) mechanism into the quantized constant envelope (CE) precoding in massive multiuser multiple-input multiple-output systems to simultaneously reduce multiuser interference and hardware power c…
View article: Reflective Amplification without Population Inversion from a Strongly Driven Superconducting Qubit
Reflective Amplification without Population Inversion from a Strongly Driven Superconducting Qubit Open
Amplification of optical or microwave fields is often achieved by strongly driving a medium to induce population inversion such that a weak probe can be amplified through stimulated emission. Here we strongly couple a superconducting qubit…
View article: Energy-Efficient Hybrid Precoding Design for Millimeter-Wave Massive MIMO Systems Via Coordinate Update Algorithms
Energy-Efficient Hybrid Precoding Design for Millimeter-Wave Massive MIMO Systems Via Coordinate Update Algorithms Open
This paper considers an energy-efficient, hybrid digital, and analog precoding design problem in millimeter-wave massive multiple-input multiple-output systems, in which the analog precoder is realized with a small number of energy-efficie…
View article: State Estimation in Smart Distribution System With Low-Precision Measurements
State Estimation in Smart Distribution System With Low-Precision Measurements Open
Efficient and accurate state estimation is essential for the optimal management of the future smart grid. However, to meet the requirements of deploying the future grid at a large scale, the state estimation algorithm must be able to accom…
View article: State Estimation in Smart Distribution System With Low-Precision Measurements
State Estimation in Smart Distribution System With Low-Precision Measurements Open
Efficient and accurate state estimation is essential for the optimal management of the future smart grid. However, to meet the requirements of deploying the future grid at a large scale, the state estimation algorithm must be able to accom…
View article: Liquid-Crystal Terahertz Quarter-Wave Plate Using Chemical-Vapor-Deposited Graphene Electrodes
Liquid-Crystal Terahertz Quarter-Wave Plate Using Chemical-Vapor-Deposited Graphene Electrodes Open
Quarter-wave operation or a phase shift of more than π/2, which is approximately ten times greater than that reported in previous works using liquid crystals (LCs) and graphene electrodes, was demonstrated. The device is transparent to the…
View article: Location Identification of Power Line Outages Using PMU Measurements With Bad Data
Location Identification of Power Line Outages Using PMU Measurements With Bad Data Open
The use of phasor angle measurements provided by phasor measurement units (PMUs) in fault detection is regarded as a promising method in identifying locations of power line outages. However, communication errors or system malfunctions may …