Results 91 to 100 of about 8,525,169 (240)

Massive Grant-Free Access in Cell-Free Massive MIMO Networks

, 2023
In this paper, a grant-free scheme is proposed for massive access from machine-type devices in cell-free massive MIMO networks. The proposed scheme, based on the coded random access approach, features transmission of multiple packet replicas per device ...
Paolini E., Valentini L., Chiani M.
core   +1 more source

Performance of Multiuser Downlink Cell-Free Massive MIMO Systems With Hard Deadlines

IEEE Access, 2022
Cell-free massive MIMO (mMIMO) is expected to be a novel network architecture to support massive connections, ultra-high transmission rate, and ultra-reliability low-latency transmission.
Le Tan, Ziyang Zhang, Dongming Wang
doaj   +1 more source

Optical Phased Arrays on Photonic Integrated Circuit Platforms: Challenges, Opportunities, and Future Applications

Nanophotonics, Volume 15, Issue 14, 27 July 2026.
Integrated optical phased arrays are emerging as scalable engines for solid‐state beam steering and programmable wavefront control. This Review maps the field from beam‐steering principles and core building blocks to material platforms, system‐level bottlenecks, and application frontiers, highlighting how heterogeneous integration, aperiodic ...
Jingwei Li, Yuyuan Han, Aoxiang Chen, Pengpeng Li, Xinglin Zhu, Guanbao Zhao, Luohan Peng, Huaibin Zheng   +7 more
wiley   +1 more source

Mixed Quality of Service in Cell-Free Massive MIMO [PDF]

IEEE Communications Letters, 2018
Cell-free massive multiple-input multiple-output (MIMO) is a potential key technology for fifth generation wireless communication networks. A mixed quality-of-service (QoS) problem is investigated in the uplink of a cell-free massive MIMO system where the minimum rate of non-real time users is maximized with per user power constraints whilst the rate ...
Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Hien Quoc Ngo, H. Vincent Poor   +4 more
openaire   +6 more sources

CNN‐DDQN Spatial Learning for Fractional Frequency Reuse Optimization in 5G Heterogeneous Networks

Engineering Reports, Volume 8, Issue 7, July 2026.
This study proposes a spatially aware DRL framework that uses multichannel network‐state tensors and a lightweight CNN‐DDQN architecture to capture interference patterns and user clustering in 5G heterogeneous networks (HetNets). The model is computationally efficient with only 7361 trainable parameters, achieving 115× faster execution and < 10 ms ...
Christian Onu, Abdulwaheed Musa, Olalekan Ogunbiyi, Lambe Mutalub Adesina, Bilkisu Jimada‐Ojuolape, Monsurat Balogun, Abdurrhaman Ademola Isa, Aliyu Ahmed, Ishmael Zibani, Adamu Murtala Zungeru   +9 more
wiley   +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

Sum-Rate of Cell Free Massive MIMO Systems With Power Amplifier Non-Linearity

IEEE Access, 2021
Cell free (CF) massive multiple input multiple output (mMIMO) has been suggested as a key solution to meet the high data rate demands of future wireless communications.
Zahra Mokhtari, Rui Dinis
doaj   +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, Jia-Yi Zhang, Jian-Cheng An, Guangyang Zhang, Zih-Yi Liu, Chau Yuen, Bo Ai   +6 more
semanticscholar   +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

Max-Min Optimal Beamforming for Cell-Free Massive MIMO

, 2020
This letter develops an optimum beamforming method for downlink transmissions in cell-free massive multiple-input multiple-output (MIMO) systems, which employ a massive number of distributed access points to provide concurrent services to multiple users.
Wu, Jingxian,, Fan, Pingzhi,, Larsson, Erik G,, Zhou, Andong,   +3 more
core   +1 more source