Results 31 to 40 of about 19,857 (226)

Spatial Multiplexing for MIMO/Massive MIMO

, 2023
In this chapter, we will discuss how to achieve spatial multiplexing in multiple-input multiple-output (MIMO) communications through precoding design, for both traditional small-scale MIMO systems and massive MIMO systems. The mathematical description for MIMO communications will first be introduced, based on which we discuss both block-level precoding
Haonan, Wang,, Ang, Li,
openaire   +2 more sources

An efficient multi‐probe enabled midfield over‐the‐air test method for 5G base station antenna pattern reconstruction

Electronics Letters
With the accelerated deployment of 5G massive multi‐input multi‐output (MIMO)‐structured base stations (BSs), accurate and efficient testing of massive MIMO arrays is essential to ensure that the 5G massive MIMO antenna array can perform as expected. The
Xudong An, Yiwen Wang, Qinjuan Zhang, Weimin Wang, Yuanan Liu   +4 more
doaj   +1 more source

The dynamic power allocation to maximize the achievable sum rate for massive MIMO‐NOMA systems

IET Communications, 2022
The demand of mobile networks and quality of service have recently increased to higher Spectral Efficiency (SE) or Energy Efficiency (EE) and massive connectivity for 5G wireless communications.
Zahra Amirifar, Jamshid Abouei
doaj   +1 more source

Frozen Differential Scattering in Reconfigurable Complex Media

Laser &Photonics Reviews, EarlyView.
A localized perturbation universally results in a rank‐one update of the scattering matrix of any complex medium. The resulting differential output wavefront is “frozen”: its spatial pattern is fixed (agnostic to the input wavefront). Experiments with a programmable‐metasurface‐parametrized wireless link validate frozen differential scattering and ...
Philipp del Hougne
wiley   +1 more source

Performance Analysis and Power Control of Cell-Free Massive MIMO Systems With Hardware Impairments

IEEE Access, 2018
As an interesting network architecture for future wireless communication systems, cellfree (CF) massive multiple-input multiple-output (MIMO) distributes an excess number of access points (APs) with single or multiple antennas to cooperatively ...
Jiayi Zhang, Yinghua Wei, Emil Bjornson, Yu Han, Shi Jin   +4 more
doaj   +1 more source

Beyond 5G and Non‐terrestrial Network (NTN) Integrated Architecture: Access Challenges for Expanding Artificial Intelligence of Things (AIoT)

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This study analyzes the architecture of the beyond 5G‐NTN (Non‐terrestrial Network) integrated network and presents the technical, legal, and regulatory challenges and considerations for expanding the Artificial Intelligence of Things (AIoT) ecosystem.
Byung Woon Kim, Ga Eun Choi
wiley   +1 more source

Orthogonally Precoded Massive MIMO for High Mobility Scenarios

IEEE Access, 2019
Massive multiple-input multiple-output (MIMO) systems are of high interest for ultra-reliable low-latency communication (URLLC) links. They provide channel hardening, i.e.
Thomas Zemen, David Loschenbrand, Markus Hofer, Christoph Pacher, Benjamin Rainer   +4 more
doaj   +1 more source

Data privacy model using blockchain reinforcement federated learning approach for scalable internet of medical things

CAAI Transactions on Intelligence Technology, EarlyView.
Abstract Internet of Medical Things (IoMT) has typical advancements in the healthcare sector with rapid potential proof for decentralised communication systems that have been applied for collecting and monitoring COVID‐19 patient data. Machine Learning algorithms typically use the risk score of each patient based on risk factors, which could help ...
Chandramohan Dhasaratha, Mohammad Kamrul Hasan, Shayla Islam, Shailesh Khapre, Salwani Abdullah, Taher M. Ghazal, Ahmed Ibrahim Alzahrani, Nasser Alalwan, Nguyen Vo, Md Akhtaruzzaman   +9 more
wiley   +1 more source

Indoor Massive MIMO Channel Modelling Using Ray-Launching Simulation

International Journal of Antennas and Propagation, 2014
Massive multi-input multioutput (MIMO) is a promising technique for the next generation of wireless communication networks. In this paper, we focus on using the ray-launching based channel simulation to model massive MIMO channels.
Jialai Weng, Xiaoming Tu, Zhihua Lai, Sana Salous, Jie Zhang   +4 more
doaj   +1 more source

Multisegment Mapping Network for Massive MIMO Detection

International Journal of Antennas and Propagation, 2021
The massive multiple-input multiple-output (MIMO) technology is one of the core technologies of 5G, which can significantly improve spectral efficiency.
Yongzhi Yu, Jianming Wang, Limin Guo
doaj   +1 more source