Results 51 to 60 of about 14,760 (220)

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

Massive MIMO With Dual-Polarized Antennas

IEEE Transactions on Wireless Communications, 2023
This paper considers a single-cell massive MIMO (multiple-input multiple-output) system with dual-polarized antennas at both the base station and users. We study a channel model that includes the key practical aspects that arise when utilizing dual-polarization: channel cross-polar discrimination (XPD) and cross-polar correlations (XPC) at the ...
Özgecan Özdogan, Emil Björnson
openaire   +2 more sources

Fundamental Challenges, Physical Implementations, and Integration Strategies for Ising Machines in Large‐Scale Optimization Tasks

Advanced Electronic Materials, EarlyView.
Ising machines are emerging as specialized hardware solvers for computationally hard optimization problems. This review examines five major platforms—digital CMOS, analog CMOS, emerging devices, coherent optics, and quantum systems—highlighting physics‐rooted advantages and shared bottlenecks in scalability and connectivity.
Hyunjun Lee, Joon Pyo Kim, Sanghyeon Kim
wiley   +1 more source

Hybrid Beamforming for Massive MIMO: A Survey [PDF]

IEEE Communications Magazine, 2017
Hybrid multiple-antenna transceivers, which combine large-dimensional analog pre/postprocessing with lower-dimensional digital processing, are the most promising approach for reducing the hardware cost and training overhead in massive MIMO systems. This paper provides a comprehensive survey of the various incarnations of such structures that have been ...
Molisch, Andreas F., Ratnam, Vishnu V., Han, Shengqian, Li, Zheda, Nguyen, Sinh Le Hong, Li, Linsheng, Haneda, Katsuyuki   +7 more
openaire   +2 more sources

Review of millimeter‐wave and terahertz near‐field synthetic aperture radar imaging technology

InfoScience, EarlyView.
Abstract This paper comprehensively reviews the development of millimeter‐wave (MMW) and terahertz (THz) near‐field imaging technologies, with an emphasis on the state of synthetic aperture radar (SAR)‐based imaging technologies. Near‐field imaging technologies are categorized into passive and active imaging modes, among which active imaging is favored
Qi Yang, Hongqiang Wang, Xu Chen, Xin Peng   +3 more
wiley   +1 more source

Throughput Analysis of Massive MIMO Uplink With Low-Resolution ADCs

, 2017
We investigate the uplink throughput achievable by a multiple-user (MU) massive multiple-input multiple-output (MIMO) system, in which the base station is equipped with a large number of low-resolution analog-to-digital converters (ADCs). Our focus is on
Giuseppe Durisi, Gustavsson, Ulf, Durisi, Giuseppe,, Coldrey, Mikael, Durisi, Giuseppe, Jacobsson, Sven,, Sven Jacobsson, Ulf Gustavsson, Christoph Studer, Gustavsson, Ulf,, Studer, Christoph, Studer, Christoph,, Mikael Coldrey, Jacobsson, Sven, Coldrey, Mikael,   +14 more
core   +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

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

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

Design Parameters for Massive Communication Systems Under Energy-Efficient Polynomial Precoder

IEEE Access, 2022
Massive multiple-input multiple output (MIMO) systems have been introduced as a resolution for next generation cellular systems. The complexity of computing the precoding in massive MIMO is increased.
Mohamed G. El-Mashed, Fahad Alraddady, Fahd Aldosari, Osama S. Faragallah   +3 more
doaj   +1 more source