Results 41 to 50 of about 10,463 (206)

Modified Conjugate Beamforming for Cell-Free Massive MIMO [PDF]

IEEE Wireless Communications Letters, 2019
The work of A. Lozano was supported in part by MINECO/FEDER, UE under Project TEC2015-66228-P, and in part by the European Research Council through H2020 Framework Programme/ERC under Grant 694974.
Masoud Attarifar, Aliazam Abbasfar, Angel Lozano   +2 more
openaire   +2 more sources

Next-Generation Multiple Access With Cell-Free Massive MIMO

Proceedings of the IEEE, 2023
<p>To meet the unprecedented mobile traffic demands of future wireless networks, a paradigm shift from conventional cellular networks to distributed communication systems is imperative. Cell-free massive multiple-input multiple-output (CF-mMIMO) represents a practical and scalable embodiment of distributed/network MIMO systems.
Mohammadali Mohammadi, Zahra Mobini, Hien Quoc Ngo, Michail Matthaiou   +3 more
openaire   +4 more sources

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

Access Point Switch ON/OFF Strategies for Green Cell-Free Massive MIMO Networking

IEEE Access, 2020
The combination of user-centric network densification and distributed massive multiple-input multiple-output (MIMO) operation has recently brought along a new paradigm in the wireless communications arena, referred to as cell-free massive MIMO networking.
Guillem Femenias, Narjes Lassoued, Felip Riera-Palou   +2 more
doaj   +1 more source

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

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 Q. Duong   +3 more
openaire   +3 more sources

Comparative Analysis of Procedures and Solutions to Improve Energy Efficiency of Massive MIMO [PDF]

International Journal of Electronics and Telecommunications, 2022
The blustery growth of high data rate applications leads to more energy consumption in wireless networks to satisfy service quality. Therefore, energy-efficient communications have been paid more attention to limited energy resources and environmentally ...
Ritu Singh Phogat, Rutvij Joshi
doaj   +1 more source

Cell-Free Massive MIMO: Uniformly great service for everyone [PDF]

2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2015
We consider the downlink of Cell-Free Massive MIMO systems, where a very large number of distributed access points (APs) simultaneously serve a much smaller number of users. Each AP uses local channel estimates obtained from received uplink pilots and applies conjugate beamforming to transmit data to the users.
Ngo, Hien Quoc, Ashikhmin, Alexei, Yang, Hong, Larsson, Erik G., Marzetta, Thomas L.   +4 more
openaire   +4 more sources

Towards Cell-Free Massive MIMO: A Measurement-Based Analysis

IEEE Access, 2022
Cell-free widely distributed massive multiple-input multiple-output (MIMO) systems utilize radio units spread out over a large geographical area. The radio signal of a user equipment (UE) is coherently detected by a subset of radio units (RUs) in the ...
David Loschenbrand, Markus Hofer, Laura Bernado, Stefan Zelenbaba, Thomas Zemen   +4 more
doaj   +1 more source

Robust Pilot Decontamination Based on Joint Angle and Power Domain Discrimination [PDF]

, 2016
We address the problem of noise and interference corrupted channel estimation in massive MIMO systems. Interference, which originates from pilot reuse (or contamination), can in principle be discriminated on the basis of the distributions of path angles ...
Cottatellucci, Laura, Gesbert, David, He, Gaoning, Müller, Ralf R., Yin, Haifan   +4 more
core   +1 more source