Results 111 to 120 of about 13,357 (238)

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, Zhuang‐Zhuang Wei, Yu‐Qi Zhang, Hong‐Xu Gao, Hai‐Tao Zhao, Hong‐Bo Zhu   +5 more
wiley   +1 more source

Correction to 'Cell-Free Massive MIMO Versus Small Cells'

, 2020
We correct the achievable rates (42) and (47) for small cells in 'Cell-free massive MIMO versus small cells,' IEEE Trans. Wireless Commun., vol. 16, 2017.
Yang, Hong, Larsson, Erik G., Ashikhmin, Alexei, Ngo, Hien Quoc; id_orcid, Marzetta, Thomas L.   +4 more
core   +1 more source

CNN-Based End-to-End CPU-AP-UE Power Allocation for Spectral Efficiency Enhancement in Cell-Free Massive MIMO Networks

Mathematics
Cell-free massive multiple-input multiple-output (MIMO) networks eliminate cell boundaries and enhance uniform quality of service by enabling cooperative transmission among access points (APs). In conventional cellular networks, user equipment located at
Yoon-Ju Choi, Ji-Hee Yu, Seung-Hwan Seo, Seong-Gyun Choi, Hye-Yoon Jeong, Ja-Eun Kim, Myung-Sun Baek, Young-Hwan You, Hyoung-Kyu Song   +8 more
doaj   +1 more source

Regularised Hyper Parameter Bi Level Optimisation With Continual Learning Based Deep Neural Network for Beamforming in Ultra‐Wide Band System

IET Communications, Volume 20, Issue 1, January/December 2026.
This research proposes a Regularised Hyperparameter Bilevel Optimisation with Continual Learning‐based Deep Neural Network (RHBO‐CLDNN) for beamforming in an Ultra‐Wide Band (UWB) system. The RHBO ensures the hyperparameter efficiency at both upper and lower levels, which allows DNN to fine‐tune the unique characteristics of the UWB system, which leads
Pradeep Kumar Siddanna, Bidare Divakarachari Parameshachari, Dharmanna Shivappa Lamani   +2 more
wiley   +1 more source

Spatial modulation for generalized MIMO: challenges, opportunities and implementation [PDF]

, 2013
A key challenge of future mobile communication research is to strike an attractive compromise between wireless network's area spectral efficiency and energy efficiency.
Renzo, Marco Di, Sugiura, S., Di Renzo, Marco, Haas, Harald, Hanzo, Lajos, Ghrayeb, Ali, Ali Ghrayeb, Marco Di Renzo, Sugiura, Shinya, Ghrayeb, A., Shinya Sugiura, Harald Haas, Hanzo, L., Lajos Hanzo   +13 more
core   +1 more source

Closed‐Form Approximation of Average Error Probability With Finite‐Blocklength Coding Over Lognormal Wireless Communication Links

IET Communications, Volume 20, Issue 1, January/December 2026.
This work extends the Polyanskiy‐Poor‐Verdu (PPV) framework to lognormal wireless links. Specifically, the paper derives a closed‐form approximation for the average error probability under lognormal distribution, effectively generalizing the PPV analysis beyond the additive white Gaussian noise assumption.
Peng Du, Yuan Zhang
wiley   +1 more source

Optimal Bilinear Equalizer for Cell-Free Massive MIMO Systems Over Correlated Rician Channels [PDF]

IEEE Transactions on Signal Processing
In this paper, we explore the low-complexity optimal bilinear equalizer (OBE) combining scheme design for cell-free massive multiple-input multiple-output networks with spatially correlated Rician fading channels.
Zhe Wang, Jiayi Zhang, Emil Björnson, D. Niyato, Bo Ai   +4 more
semanticscholar   +1 more source

Massive Grant-Free Access in Cell-Free Massive MIMO Networks

, 2023
In this paper, a grant-free scheme is proposed for massive access from machine-type devices in cell-free massive MIMO networks. The proposed scheme, based on the coded random access approach, features transmission of multiple packet replicas per device ...
Paolini E., Valentini L., Chiani M.
core  

Cell-Free Massive MIMO with Channel Aging and Pilot Contamination

, 2020
In this paper, we investigate the impact of channel aging on the performance of cell-free (CF) massive multiple-input multiple-output (MIMO) systems with pilot contamination.
Björnson, Emil,, Emil Bjornson, Zhang, J.,, Jiakang Zheng, Jiayi Zhang, Zheng, Jiakang,, Bo Ai, Ai, Bo,   +7 more
core   +1 more source

Cell-Free Massive MIMO-OFDM for High-Speed Train Communications

, 2022
Cell-free (CF) massive multiple-input multiple-output (MIMO) systems show great potentials in low-mobility scenarios, due to cell boundary disappearance and strong macro diversity.
Björnson, Emil,, Emil Bjornson, Zhetao Li, Jiakang Zheng, Jiayi Zhang, Zhang, Jiayi,, Li, Zhetao,, Zheng, Jiakang,, Bo Ai, Ai, Bo,   +9 more
core   +1 more source