Results 61 to 70 of about 539,850 (216)

Nonlinear 1-bit precoding for massive MU-MIMO with higher-order modulation

, 2016
Massive multi-user (MU) multiple-input multiple-output (MIMO) is widely believed to be a core technology for the upcoming fifth-generation (5G) wireless communication standards. The use of low-precision digital-to-analog converters (DACs) in MU-MIMO base
Goldstein, Tom, Giuseppe Durisi, Durisi, Giuseppe,, Coldrey, Mikael, Goldstein, Tom,, Durisi, Giuseppe, Jacobsson, Sven,, Sven Jacobsson, Christoph Studer, Studer, Christoph, Studer, Christoph,, Tom Goldstein, Jacobsson, Sven, Mikael Coldrey, Coldrey, Mikael,   +14 more
core   +1 more source

Relay-assisted multiuser MIMO-DQSM system for correlated fading channels

ETRI Journal
This paper presents the performance evaluation of an amplify-and-forward (AF) relay-assisted multiuser multiple input-multiple output (MU-MIMO) downlink transmission system for correlated fading channels.
Francisco R. Castillo-Soria, Carlos Gutierrez, Fermin M. Maciel-Barboza, Viktor I. Rodriguez Abdala, Jayanta Datta   +4 more
doaj   +1 more source

PAPR-Aware Massive MIMO-OFDM Downlink

IEEE Access, 2019
We investigate the peak-to-average power ratio (PAPR) reduction problem in orthogonal frequency-division multiplexing-based massive multi-user (MU) multiple-input multiple-output (MIMO) downlink systems.
Rafik Zayani, Hmaied Shaiek, Daniel Roviras   +2 more
doaj   +1 more source

Multi‐Domain Linear Hybrid Semi‐Mechanism Modeling and Two‐Level Coordinated Control for a Cascade Dual‐Rotor Wind Turbine

Wind Energy, Volume 29, Issue 10, October 2026.
ABSTRACT For a newly emerging kind of cascade dual‐rotor wind turbine (CDR‐WT), the coordinated control of its front and rear rotor faces significant challenges. To solve this problem, a novel modeling and control design approach is presented in this paper.
Yang Hu, Kaishen Yuan, Haonan Wang, Maofeng Shao   +3 more
wiley   +1 more source

MU-MIMO RFID: Proof of Concept

2024 IEEE International Conference on RFID (RFID)
Radio Frequency Identification (RFID) is often used in high tag density scenarios where tag read rate becomes a limiting factor. Current Class 1 Gen 2 (C1G2) RFID systems are limited in read rate by the Framed Slotted Aloha (FSA) scheduling algorithm and physical layer modulation parameters. We propose a multi-user MIMO (MU-MIMO) RFID system compatible
Ryan Jones, Shuai Yang, Richard V. Penty, Michael J. Crisp   +3 more
openaire   +2 more sources

Joint Channel Impulse Response and Noise-Variance Estimation for OFDM{\slash}SDMA Systems Based on Expectation Maximization

, 2010
A joint channel impulse response (CIR) and noise-variance estimation scheme is proposed for multi-user Multiple-Input-Multiple-Output (MIMO) Orthogonal Frequency-Division Multiplexing\,/\,Space Division Multiple Access (OFDM/SDMA) systems, which is based
Mu, Xiaomin, Hanzo, Lajos, Zhang, Jiankang   +2 more
core   +1 more source

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

Advanced Electronic Materials, Volume 12, Issue 17, 7 September 2026.
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

Uplink MU-MIMO in Asynchronous Wireless LANs [PDF]

Proceedings of the Eighteenth ACM International Symposium on Mobile Ad Hoc Networking and Computing, 2018
In wireless LANs (WLANs), network-wide time and frequency synchronization among user devices is widely regarded as a necessity for uplink MU-MIMO. Therefore, to enable uplink MU-MIMO in 802.11ax, dedicated MAC protocols (e.g., trigger frame and timing advance mechanism) have been proposed to synchronize user devices in the time and frequency domains ...
Huacheng Zeng, Hongxiang Li 0001, Qiben Yan 0001   +2 more
openaire   +2 more sources

Ultra-High-Reliability and Low-Complexity Power Allocation for Next-Generation Wi-Fi MU-MIMO

IEEE Access
Ultra-high reliability (UHR) stands as a central design objective for next-generation Wi-Fi standards, aiming to deliver deterministic and robust wireless connectivity. In this context, effective power allocation is essential for multi-user MIMO (MU-MIMO)
Zexiao Lu, Bin Wu, Xiaoxin Liang, Xiaoping Zhou, Guangxi Liu   +4 more
doaj   +1 more source

Overcoming the Phase Discontinuity Problem in RIS Optimization: A Robust and Scalable Phase‐Aware Deep Regression Framework via Hybrid CNN–LSTM Architecture

Advanced Intelligent Systems, Volume 8, Issue 9, September 2026.
The phase discontinuity problem—where the cyclic nature of phase angles causes catastrophic errors near the ±π boundary—is a fundamental obstacle in learning‐based reconfigurable intelligent surface (RIS) optimization. A phase‐aware hybrid CNN–LSTM framework resolves this by decomposing phase predictions into sine–cosine components, mapping circular ...
Seda Savaşçı Şen, Ali Çalhan, Murtaza Cicioğlu, Oğuzhan Demiryürek   +3 more
wiley   +1 more source