Results 81 to 90 of about 13,357 (238)

Cell-Free Massive MIMO in 5G and Beyond [PDF]

, 2021
Στην παρούσα διπλωματική εργασία εξετάζεται μία νέα αρχιτεκτονική δικτύων, η οποία καταργώντας το συμβατικό σύστημα των κυψελών (Cell-Free) υπόσχεται όχι μόνο να παράσχει πλήρη ικανοποίηση των προδιαγραφών που έχουν ορίσει τα τωρινά 5G δίκτυα, αλλά και ...
Chiotis Ioannis, Χιώτης Ιωάννης   +1 more
core  

Fundamental Challenges, Physical Implementations, and Integration Strategies for Ising Machines in Large‐Scale Optimization Tasks

Advanced Electronic Materials, EarlyView.
Ising machines are emerging as specialized hardware solvers for computationally hard optimization problems. This review examines five major platforms—digital CMOS, analog CMOS, emerging devices, coherent optics, and quantum systems—highlighting physics‐rooted advantages and shared bottlenecks in scalability and connectivity.
Hyunjun Lee, Joon Pyo Kim, Sanghyeon Kim
wiley   +1 more source

The Cell-Free Networks Enhancement by Relays Implementa-tion [PDF]

International Journal of Telecommunications, 2023
Data rates that users can sustain in both uplink and downlink can be increased because of multiple input multiple output (MIMO) technology. MIMO is therefore a new technology for 5G networks and beyond.
doaj   +1 more source

Integrated LEO Constellation and In‐Cabin Distribution System for Continuous Aircraft 5G Connectivity

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT The integration of low Earth orbit (LEO) satellite constellations with commercial aircraft communication systems presents critical challenges in maintaining continuous connectivity during dynamic flight conditions. Current geostationary satellite systems suffer from high round‐trip latency (>$$ > $$ 500 ms) and inadequate coverage at high ...
Raúl Parada, Victor Monzon Baeza, Carlos Horcajo Fernández de Gamboa, Rocío Serrano Camacho, Carlos Monzo   +4 more
wiley   +1 more source

Joint AP-UE Association and Precoding for SIM-Aided Cell-Free Massive MIMO Systems [PDF]

IEEE Transactions on Wireless Communications
Cell-free (CF) massive multiple-input multiple-output (mMIMO) systems are emerging as promising alternatives to cellular networks, especially in ultra-dense environments. However, further capacity enhancement requires the deployment of more access points
Enyu Shi, Jiayi Zhang, Jiancheng An, Guangyang Zhang, Zih-Yi Liu, Chau Yuen, Bo Ai   +6 more
semanticscholar   +1 more source

Low‐Complexity Hybrid Beamforming for LEO Satellites: Beam Update Rate Analysis and Advanced Adaptive Precoding

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Low Earth Orbit (LEO) satellite constellations offer unprecedented opportunities for global broadband connectivity but pose significant beamforming challenges due to rapid platform motion and stringent onboard hardware constraints. Fully digital architectures, while optimal in theory, remain impractical for satellite payloads, motivating ...
Mohammad Momani, Thomas Delamotte, Andreas Knopp   +2 more
wiley   +1 more source

Cell-Free Massive MIMO with Multiple-Antenna Users under I/Q Imbalance

, 2021
Cell-free massive multiple-input multiple-output (MIMO) is a core technology for future wireless communication systems, since it harnesses benefits from massive MIMO and distributed MIMO systems.
Sutton, James, Ngo, Hien-Quoc; id_orcid, Hien Quoc Ngo, James A. C. Sutton, Michail Matthaiou, Matthaiou, Michalis; id_orcid   +5 more
core   +1 more source

Effective Channel Gain-Based Access Point Selection in Cell-Free Massive MIMO Systems

IEEE Access, 2020
In this paper, we investigate the selection problem of access points (APs) in cell-free massive multiple-input multiple-output (MIMO) systems, where APs equipped with a large number of antennas are geographically distributed over a wide area with no cell
Hieu Trong Dao, Sunghwan Kim
doaj   +1 more source

The state of the art in beyond 5G distributed massive multiple-input multiple-output communication system solutions [version 1; peer review: 1 approved, 2 approved with reservations]

Open Research Europe, 2022
Beyond fifth generation (5G) communication systems aim towards data rates in the tera bits per second range, with improved and flexible coverage options, introducing many new technological challenges in the fields of network architecture, signal ...
F. Ponzini, A. Filippi, U. Johannsen, D. Kruglov, E. Meyer, R. Argaez-Ramirez, M. Krivic, A. Briseno Ojeda, Y. Zhang, K. Alekseev, K. Smirnova, B. Cimbili, M. Safari Mugisho, Y. Dang, N. Farid, M. Ensan, M. Shahid, H. Bao, J. Banar, U. Gustavsson, M. Matters-Kammerer, T. Zwick, F. Demuynck, C. Fager, M. Acar, M. Ivashina, M. van der Heijden, M. Hasselblad, D. Caratelli, K. Eriksson, A.B. Smolders, M. Tanveer, C. Ulusoy, R. Maaskant, M. Johannson, D. Floriot, R. Quay, L.A. Bronckers, M. Bao, M.C. van Beurden, J. Fridén, C. Kolitsidas, B.P. de Hon, Hamdi Joudeh, D. Blanco, T. Eriksson, F.M.J. Willems   +46 more
doaj   +1 more source

Beyond 5G and Non‐terrestrial Network (NTN) Integrated Architecture: Access Challenges for Expanding Artificial Intelligence of Things (AIoT)

International Journal of Satellite Communications and Networking, Volume 44, Issue 4, Page 378-393, July/August 2026.
ABSTRACT This study analyzes the architecture of the beyond 5G‐NTN (Non‐terrestrial Network) integrated network and presents the technical, legal, and regulatory challenges and considerations for expanding the Artificial Intelligence of Things (AIoT) ecosystem.
Byung Woon Kim, Ga Eun Choi
wiley   +1 more source