Results 91 to 100 of about 11,967 (225)

Physical layer authentication for 5G/6G millimeter wave communications by using channel sparsity

IET Communications, 2022
This paper proposes a comprehensive study for the physical layer channel based authentication (PLA) designs in mmWave communications, which reveals the principles that how does the sparse properties of mmWave channel can benefit the PLA designs and ...
Jie Tang, Hong Wen, Huanhuan Song
doaj   +1 more source

Millisecond‐Switching Dual‐Band/Dual‐Polarization Ka‐Band Wavefront Control Enabled by a Complementary Liquid‐Crystal Metasurface

Advanced Materials Technologies, Volume 11, Issue 4, 19 February 2026.
An LCD‐compatible complementary liquid‐crystal metasurface delivers dual‐band, dual‐polarized Ka‐band wavefront control with millisecond switching via a 10‐µm LC gap. Interlaced patch/slot pairs enable independent phase tuning at 28 and 38 GHz, while strategic 45° slot rotation suppresses parasitic resonances. Measurements on a 160 × 160‐cell prototype
Daehyeon Kim, Donggeun An, Hyunjae Shin, Youngno Youn, Wonbin Hong   +4 more
wiley   +1 more source

Transport Layer Performance in 5G mmWave Cellular [PDF]

, 2016
The millimeter wave (mmWave) bands are likely to play a significant role in next generation cellular systems due to the possibility of very high throughput thanks to the availability of massive bandwidth and high-dimensional antennas.
Di Kong, Panwar, Shivendra, Zorzi, Michele, Ford, Russell, Zhang, Menglei, Zorzi, Michelle, Sundeep Rangan, Michele Zorzi, Nix, Andrew R, Rangan, Sundeep, Mezzavilla, Marco, Mellios, Evangelos, Shivendra Panwar, Andrew Nix, Kong, Di, Russell Ford, Nix, Andrew, Evangelos Mellios, Menglei Zhang, Marco Mezzavilla   +19 more
core   +3 more sources

Phase Smoothing for Mutual Coupling Mitigation in Multifunctional Metasurfaces Designed with Diffractive Neural Networks

Advanced Optical Materials, Volume 14, Issue 1, 9 January 2026.
A diffractive neural networkdesigned metasurface operating at 86 GHz generates multiple holographic patterns by controlling the phase of subwavelength unit cells. A phase‐smoothing regularization mitigates mutual coupling, enabling accurate multifunctional wavefront shaping.
Damián Rodríguez‐Trujillo, Alicia E. Torres‐García, Mikel Aldea, Jorge Teniente, Asier Marzo‐Pérez, Miguel Beruete   +5 more
wiley   +1 more source

Graphene-based beam-reconfigurable liquid antenna for 5G mmWave wireless systems

Frontiers in Communications and Networks
The advancement of wireless technologies has led to significant progress in antenna design in order to meet the continuously increasing demands. Liquid antennas have gained significant interest in research owing to their distinctive properties, such as ...
Sasmita Dash, Constantinos Psomas, Ioannis Krikidis   +2 more
doaj   +1 more source

Phase‐Changing Vanadium Oxides for Electromagnetic Radiation Management

Small Science, Volume 6, Issue 1, January 2026.
Vanadium dioxide's reversible insulator‐to‐metal transition near room temperature enables ultrafast, broadband electromagnetic modulation from ultraviolet to radiofrequencies. With femtosecond switching speeds and cycling endurance exceeding 100 million cycles, VO2 metasurfaces achieve tuneable absorption, beam steering, and polarisation control. These
Mohammad Taha, Torben Daeneke, Sumeet Walia   +2 more
wiley   +1 more source

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

Millimeter Wave Energy Absorption by Human Tissues: Evaluation of Tissue Penetration [PDF]

Iranian Journal of Electrical and Electronic Engineering
Presented in this paper is an evaluation of human tissue penetration by millimeter wave (mmW) energy, particularly at 30, 35, 40 and 45 GHz. Numerical simulations show that the penetration depths in the tissue are (0.1000, 0.0937, 0.08869 and 0.08882) mm
Godday Biowei, Sulaiman Adeniyi Adekola, Kamoli Akinwale Amusa   +2 more
doaj  

Imperfections to be Considered in mmWave Systems for Hybrid Processing / Imperfeições a serem consideradas em sistemas mmWave para processamento híbrido [PDF]

, 2021
This paper describes a methodology to generate mmWave scenarios, where both imperfect channel estimation and noised phase shifters are considered. This methodology is greatly useful to evaluate hybrid precoder performance. Numerical results evidence that
Nóbrega, Luciana Farias de Oliveira, Ortega, Alvaro Javier, Silva, Jackeline Dourado da   +2 more
core  

Exploring Missed Spectrum Access Opportunities in Wi‐Fi 6 and 5G NR‐U Coexistence for Enhancing 6 GHz Spectrum Utilization

IET Communications, Volume 20, Issue 1, January/December 2026.
This paper investigates new radio spectrum coexistence mechanisms, leveraging the currently uninhabited 6 GHz bands and aiming for fair coexistence of Wi‐Fi 6 and 5G new radio unlicensed (NR‐U). A novel two‐stage channel contention mechanism is proposed to explore additional spectrum access opportunities which remain unrealized in the existing channel ...
Md Toufiqur Rahman, Jiang Xie, Xingya Liu   +2 more
wiley   +1 more source