Results 71 to 80 of about 20,641 (239)

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

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

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

Clustering-Based Activity Detection Algorithms for Grant-Free Random Access in Cell-Free Massive MIMO [PDF]

IEEE Transactions on Communications, 2021
Future wireless networks need to support massive machine type communication (mMTC) where a massive number of devices accesses the network and massive MIMO is a promising enabling technology. Massive access schemes have been studied for co-located massive
Unnikrishnan Kunnath Ganesan, Emil Björnson, E. Larsson   +2 more
semanticscholar   +1 more source

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

Dealing with Interference in Distributed Large-scale MIMO Systems: A Statistical Approach [PDF]

, 2014
This paper considers the problem of interference control through the use of second-order statistics in massive MIMO multi-cell networks. We consider both the cases of co-located massive arrays and large-scale distributed antenna settings.
Cottatellucci, Laura, Gesbert, David, Yin, Haifan   +2 more
core   +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

RIS-Aided Cell-Free Massive MIMO Systems for 6G: Fundamentals, System Design, and Applications [PDF]

Proceedings of the IEEE, 2023
An introduction of intelligent interconnectivity for people and things has posed higher demands and more challenges for sixth-generation (6G) networks, such as high spectral efficiency and energy efficiency (EE), ultralow latency, and ultrahigh ...
Enyu Shi, Jiayi Zhang, Hongyang Du, Bo Ai, Chau Yuen, Dusist Niyato, K. Letaief, Xuemin Shen   +7 more
semanticscholar   +1 more source

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