Results 61 to 70 of about 8,525,169 (240)

Downlink transmission and channel estimation for cell-free massive MIMO-OFDM with DSDs

EURASIP Journal on Advances in Signal Processing, 2022
In a cell-free massive MIMO system, multiple users arrive at multiple access points at separate times, while in an OFDM system, different delays can be equivalent to delay spread differences (DSDs).
Yunxiang Guo, Zhenqi Fan, An Lu, Pan Wang, Dongjie Liu, Xinjiang Xia, Dongming Wang   +6 more
doaj   +1 more source

Scalable Cell-Free Massive MIMO with Multiple CPUs

Mathematics, 2022
In this paper, we consider the uplink of a scalable cell-free massive MIMO (CF-M-MIMO) system where user equipments (UEs) are served only by a subset of access points (APs).
Feiyang Li, Qiang Sun, Xiaodi Ji, Xiaomin Chen   +3 more
doaj   +1 more source

Performance of Cell-Free Massive MIMO With Rician Fading and Phase Shifts [PDF]

IEEE Transactions on Wireless Communications, 2019
In this paper, we study the uplink (UL) and downlink (DL) spectral efficiency (SE) of a cell-free massive multiple-input-multiple-output (MIMO) system over Rician fading channels.
Özgecan Özdogan, Emil Björnson, Jiayi Zhang   +2 more
semanticscholar   +1 more source

User-Centric Cell-Free Massive MIMO Networks: A Survey of Opportunities, Challenges and Solutions [PDF]

IEEE Communications Surveys and Tutorials, 2021
Densification of network base stations is indispensable to achieve the stringent Quality of Service (QoS) requirements of future mobile networks. However, with a dense deployment of transmitters, interference management becomes an arduous task.
Hussein A. Ammar, R. Adve, Shahram Shahbazpanahi, G. Boudreau, K. V. Srinivas   +4 more
semanticscholar   +1 more source

Local Partial Zero-Forcing Precoding for Cell-Free Massive MIMO [PDF]

IEEE Transactions on Wireless Communications, 2019
Cell-free Massive MIMO (multiple-input multiple-output) is a promising distributed network architecture for 5G-and-beyond systems. It guarantees ubiquitous coverage at high spectral efficiency (SE) by leveraging signal co-processing at multiple access ...
Giovanni Interdonato, Marcus Karlsson, Emil Björnson, E. Larsson   +3 more
semanticscholar   +1 more source

Cell-Free Massive MIMO for Wireless Federated Learning [PDF]

IEEE Transactions on Wireless Communications, 2020
This paper proposes a novel scheme for cell-free massive multiple-input multiple-output (CFmMIMO) networks to support any federated learning (FL) framework. This scheme allows each instead of all the iterations of the FL framework to happen in a large-scale coherence time to guarantee a stable operation of an FL process.
Tung Thanh Vu, Duy Trong Ngo, Nguyen Hoang Tran, Hien Quoc Ngo, Minh Ngoc Dao, Richard H. Middleton   +5 more
openaire   +4 more sources

Technology Trends for Massive MIMO towards 6G

Sensors, 2023
At the dawn of the next-generation wireless systems and networks, massive multiple-input multiple-output (MIMO) in combination with leading-edge technologies, methodologies, and architectures are poised to be a cornerstone technology. Capitalizing on its
Yiming Huo, Xingqin Lin, Boya Di, Hongliang Zhang, Francisco Javier Lorca Hernando, Ahmet Serdar Tan, Shahid Mumtaz, Özlem Tuğfe Demir, Kun Chen-Hu   +8 more
doaj   +1 more source

Ultradense Cell-Free Massive MIMO for 6G: Technical Overview and Open Questions [PDF]

Proceedings of the IEEE
Ultradense cell-free massive multiple-input–multiple-output (CF-MMIMO) has emerged as a promising technology expected to meet the future ubiquitous connectivity requirements and ever-growing data traffic demands in sixth generation (6G).
H. Ngo, Giovanni Interdonato, Erik G. Larsson, Giuseppe Caire, Jeffrey G. Andrews   +4 more
semanticscholar   +1 more source

Pilot Power Control for Cell-Free Massive MIMO [PDF]

IEEE Transactions on Vehicular Technology, 2018
In this correspondence paper, we consider a cell-free massive Multiple-Input Multiple-Output (MIMO) system where access points (APs) serve a much smaller number of users under the time-division duplex operation. The APs first estimate the channels via the uplink training phase.
Trang C. Mai, Hien Quoc Ngo, Malcolm Egan, Trung Quang Duong   +3 more
openaire   +2 more sources

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   +1 more source