Results 51 to 60 of about 4,370 (213)
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
Multiple-Beam Selection With Limited Feedback for Hybrid Beamforming in Massive MIMO Systems
IEEE Access, 2017 Hybrid multiple-input multiple-output (MIMO) systems have been thought as a promising technology in future 5G. Compared with conventional digital MIMO systems, such a structure is equipped with fewer RF chains, which would reduce the computational ...
Yuwei Ren +3 more
doaj +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
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
Millimeter-Wave Hybrid Beamforming Based on Implicit Channel State Information
, 2019 Millimeter wave (mmWave) spectrum above 30 GHz offers us an opportunity to pursue high-data-rate transmission using a channel bandwidth up to several gigahertz. To provide reliable link quality in mmWave frequency bands, hybrid analog-digital beamforming
Chiang, Hsiao-Lan
core +1 more source
Hybrid Beamforming for Active Sensing using Sparse Arrays
, 2020 This paper studies hybrid beamforming for active sensing applications, such as millimeter-wave or ultrasound imaging. Hybrid beamforming can substantially lower the cost and power consumption of fully digital sensor arrays by reducing the number of ...
Koivunen, Visa +2 more
core +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
Hybrid Beamforming for Millimeter-Wave Heterogeneous Networks
, 2019 Heterogeneous networks (HetNets) employing massive multiple-input multiple-output (MIMO) and millimeter-wave (mmWave) technologies have emerged as a promising solution to enhance the network capacity and coverage of next-generation 5G cellular networks ...
Mostafa Hefnawi
core +1 more source
Epilepsia, EarlyView.Abstract Objective Surgical decision‐making in temporal lobe epilepsy (TLE) faces a critical challenge in determining whether the hippocampus can be safely spared during anterior temporal resection, particularly when surgery involves the language‐dominant hemisphere.
Guhan Seshadri NP +6 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