Results 71 to 80 of about 10,463 (206)
Study of Clustering Solutions for Scalable Cell-Free Massive MIMO
IEEE Access, 2023 In response to the requirements of 5G and beyond, cell-free systems have emerged to ensure uniform service throughout the area. However, the idea of having no cells leads to a considerably large monolithic system, which is not scalable.
Danaisy Prado-Alvarez +4 more
doaj +1 more source
A Bilinear Equalizer for Massive MIMO Systems
, 2018 We present a novel approach for low-complexity equalizer design well-suited for cellular massive MIMO systems. Our design allows to exploit the channel structure in terms of covariance matrices to improve the performance in the face of pilot ...
Joham, Michael +3 more
core +1 more source
Group-blind detection with very large antenna arrays in the presence of pilot contamination [PDF]
, 2015 Massive MIMO is, in general, severely affected by pilot contamination. As opposed to traditional detectors, we propose a group-blind detector that takes into account the presence of pilot contamination.
Ferrante, Guido Carlo +3 more
core +2 more sources
Robust Spectral and Energy Efficiency Tradeoff for RIS‐Aided Multi‐User Communication
IET Communications, Volume 20, Issue 1, January/December 2026.In this work, an RIS‐aided multi‐user network with imperfect CSI is investigated. Correspondingly, we focus on balancing SE and EE through the collaborative design of the base station (BS)'s precoding matrix and the RIS's phase shifts, which consider the transmit power budget and the channel uncertainties constraints.
Xiandeng He, Yilin Wang, Shun Zhang
wiley +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
, 2015 A subspace method for channel estimation has been recently proposed [1] for tackling the pilot contamination effect, which is regarded by some researchers as a bottleneck in massive MIMO systems.
Gesbert, David +3 more
core +1 more source
A Massive Grant‐Free Random Access Scheme Based on Spectrum Sensing and Preamble Delay
IET Communications, Volume 20, Issue 1, January/December 2026.This paper introduces cognitive radio (CR) and preamble delay (PD) to reduce access collisions, together with non‐orthogonal multiple access (NOMA) to improve spectrum efficiency, and thus proposes an efficient CR‐NOMA‐PD‐based massive grant‐free random multiple access scheme.
Jing Zhang +5 more
wiley +1 more source
Coordinated air-ground scheduling for UAV-assisted cell-free massive MIMO
Dianxin kexue, 2022 Cell-free massive multiple-input multiple-output (MIMO) technology uses a large number of access points (AP) to provide efficient communication services for terrestrial users.However, massive APs and users increase the demand for channel state ...
Danhao DENG +3 more
doaj +2 more sources
IEEE Access, 2020 The irruption of the cell-free (CF) massive multiple-input multiple-output (MIMO) network topology has meant taking one step further the concept of massive MIMO as a means to provide uniform service in large coverage areas. A key property of massive MIMO
Alberto Alvarez Polegre +3 more
doaj +1 more source
A survey on user-centric cell-free massive MIMO systems
Digital Communications and Networks, 2022 The mobile data traffic has been exponentially growing during the last several decades. This was enabled by the densification of the network infrastructure in terms of increased cell density (i.e., Ultra-Dense Network (UDN)) and/or the increased number ...
Shuaifei Chen +4 more
doaj +1 more source