6G wireless communications networks: A comprehensive survey

M Alsabah, MA Naser, BM Mahmmod… - Ieee …, 2021 - ieeexplore.ieee.org
The commercial fifth-generation (5G) wireless communications networks have already been
deployed with the aim of providing high data rates. However, the rapid growth in the number …

Massive MIMO channel subspace estimation from low-dimensional projections

S Haghighatshoar, G Caire - IEEE Transactions on Signal …, 2016 - ieeexplore.ieee.org
Massive MIMO is a variant of multiuser MIMO (Multi-Input Multi-Output) system, where the
number of basestation antennas M is very large and generally much larger than the number …

On the ergodic rate lower bounds with applications to massive MIMO

G Caire - IEEE Transactions on Wireless Communications, 2018 - ieeexplore.ieee.org
A well-known lower bound widely used in the massive MIMO literature hinges on channel
hardening, ie, the phenomenon for which, thanks to the large number of antennas, the …

A new approach to user scheduling in massive multi-user MIMO broadcast channels

G Lee, Y Sung - IEEE Transactions on Communications, 2017 - ieeexplore.ieee.org
In this paper, a new two-phase-feedback-based user-scheduling-and-beamforming method
is proposed for multi-user multiple-input multiple-output downlink in the context of two-stage …

Impact of line-of-sight and unequal spatial correlation on uplink MU-MIMO systems

H Tataria, PJ Smith, LJ Greenstein… - IEEE Wireless …, 2017 - ieeexplore.ieee.org
Closed-form approximations of the expected per-terminal signal-to-interference-plus-noise-
ratio (SINR) and ergodic sum spectral efficiency of a multiuser multiple-input multiple-output …

Does massive MIMO fail in Ricean channels?

M Matthaiou, PJ Smith, HQ Ngo… - IEEE Wireless …, 2018 - ieeexplore.ieee.org
Massive multiple-input multiple-output (MIMO) is now making its way to the standardization
exercise of future 5G networks. Yet, there are still fundamental questions pertaining to the …

Accelerating Iteratively Linear Detectors in Multi-User (ELAA-) MIMO Systems with UW-SVD

J Liu, Y Ma, J Wang, R Tafazolli - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
Current iterative multiple-input multiple-output (MIMO) detectors suffer from slow
convergence when the wireless channel is ill-conditioned. The ill-conditioning is mainly …

Downlink training design for FDD massive MIMO systems in the presence of colored noise

MA Naser, M Alsabah, BM Mahmmod, NK Noordin… - Electronics, 2020 - mdpi.com
Massive multiple-input multiple-output (MaMi) systems have attracted much research
attention during the last few years. This is because MaMi systems are able to achieve a …

Performance evaluation of frequency division duplex (FDD) massive multiple input multiple output (MIMO) under different correlation models

AM Abdul-Hadi, MA Naser, M Alsabah… - PeerJ Computer …, 2022 - peerj.com
Massive multiple-input multiple-output (massive-MIMO) is considered as the key technology
to meet the huge demands of data rates in the future wireless communications networks …

Scheduling in massive MIMO: User clustering and pilot assignment

SE Hajri, M Assaad, G Caire - 2016 54th Annual Allerton …, 2016 - ieeexplore.ieee.org
In this paper, we consider the problem of user scheduling and pilot assignment in TDD
multicell multiuser Massive MIMO systems. While in TDD systems the channel is acquired …