Results 51 to 60 of about 4,393 (215)
Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems
Advanced Electronic Materials, EarlyView.Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang +9 more
wiley +1 more source
Sequential Hybrid Beamforming for Radio Stripes
IEEE AccessCell-free (CF) massive multiple-input multiple-output (mMIMO) systems will revolutionize wireless communication by moving away from traditional base stations (BSs). By eliminating conventional cell boundaries, CF mMIMO deploys a large number of distributed access points (APs), enabling seamless connectivity across a wide area, more flexible resource ...
Joumana Kassam +4 more
openaire +3 more sources
Recent Advances in Programmable Metasurfaces and Meta‐Devices
Advanced Electronic Materials, EarlyView.Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao +4 more
wiley +1 more source
IET Microwaves, Antennas & Propagation, 2023 Next generation communication systems go to tetra‐hertz (THz) frequency bands. In this article, low‐complexity but near‐optimal hybrid beamforming design is investigated in THz by considering its unique channel characteristics and discuss potential ...
Qingdong Yue, Jie Hu, Kun Yang
doaj +1 more source
Advanced Intelligent Systems, EarlyView.A piezoelectric meta‐transducer generates an ultrasonic rainbow, steering guided elastic waves to different angles according to frequency. A dithering‐based binary electrode design enables a closer realization of the target wavenumber filter, improving directional purity and suppressing unwanted lobes. Numerical and experimental validation demonstrates
Masoud Mohammadgholiha +5 more
wiley +1 more source
Digital beamforming and multidimensional waveform encoding for sapceborne radar remote sensing [PDF]
, 2007 This paper introduces the innovative concept of multidimensional waveform encoding for space-borne synthetic aperture radar (SAR). The combination of this technique with digital beamforming on receive enables a new generation of SAR systems with ...
Moreira, Alberto +2 more
core
Hybrid beamforming for millimeter wave communications [PDF]
, 2022 Communications over millimeter wave (mmWave) frequencies is a key component of the fifth generation (5G) cellular networks due to the large bandwidth available at mmWave bands.
Zhan, Jinlong
core +1 more source
Advanced Intelligent Systems, EarlyView.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 +3 more
wiley +1 more source
On a Hybrid Beamforming/Space-Time Coding Scheme [PDF]
IEEE Communications Letters, 2004 A multiple transmit antenna system based on hybrid beamforming and space-time coding technologies is examined. The reduction factor of the required transmitted energy achievable by the use of hybrid scheme is quantified for any given outage capacity.
Li Ping 0001 +2 more
openaire +1 more source
Low Complexity and Robust Codebook-Based Analog Beamforming for Millimeter Wave MIMO Systems
IEEE Access, 2017 Millimeter-wave (mm-Wave) MIMO systems have been proposed to achieve higher spectral efficiency via the hybrid beamforming structure, which consists of analog beamforming and digital beamforming.
Yong Niu +5 more
doaj +1 more source