Results 21 to 30 of about 6,373 (171)

Adaptive Antenna Null Broadening Beamforming against Array Calibration Error Based on Adaptive Variable Diagonal Loading

International Journal of Antennas and Propagation, 2017
An approach for null broadening beamforming is proposed based on adaptive variable diagonal loading (VDL) and combined with the covariance matrix taper (CMT) approach, aiming at improving the robustness of adaptive antenna null broadening beamforming ...
Wenxing Li, Yu Zhao, Qiubo Ye, Bin Yang
doaj   +1 more source

Robust Beamforming for Ultrasonic Imaging using Wavelet-based Thresholding and Coherence Weighting [PDF]

International Journal of Industrial Electronics, Control and Optimization
The delay-and-sum (DS) beamforming and delay-weight-and-sum (DWS) beamforming are primary methods in ultrasonic imaging with phased arrays. Total focusing method (TFM) and Minimum Variance (MV) based adaptive beamforming are well-known methods within DS ...
Mozhgan Ehsani, Mehdi Bekrani, Solyman Garousi   +2 more
doaj   +1 more source

Joint Control of Radiated and Surface Waves via Space‐Time Coding Metasurfaces

Advanced Functional Materials, EarlyView.
A unified space‐time coding metasurface platform enables simultaneous control of radiated and surface‐confined waves across multiple harmonics. Demonstrated functionalities include multi‐frequency beam shaping; surface‐wave excitation, and hybrid multiplexing.
Zihao Dai, Yi Ning Zheng, Lei Zhang, Xiao Qing Chen, Giuseppe Castaldi, Tie Jun Cui, Vincenzo Galdi   +6 more
wiley   +1 more source

Adaptive Wideband Beamforming Based on Digital Delay Filter

Journal of Microwaves, Optoelectronics and Electromagnetic Applications
A novel adaptive wideband beamforming method is proposed, where beamforming is achieved by LMS based space-time adaptive filtering algorithm. Conventional broadband beamforming requires desired signal to be incident from the broadside i.e.
Zeeshan Ahmad, Song Yaoliang, Qiang Du
doaj   +1 more source

Downlink beamforming concepts in UTRA FDD [PDF]

Advances in Radio Science, 2003
This article gives a comparison of beamforming concepts. Adaptive beamforming and fixed beam switching in WCDMA-FDD-mode are compared from a system level perspective, ordinary sectorization (three 120° sectors) serves as a basis for comparison.
M. Schacht, A. Dekorsy, P. Jung
doaj  

Remorphable Architectures: Reprogramming Global Bistability through Locally Bistable Metamaterials

Advanced Materials, EarlyView.
Local bistable reconfiguration in mechanical metamaterials is leveraged in globally bistable architectures to enable in situ reprogrammable transition pathways through state flip of individual building blocks. The local‐to‐global correspondence of instabilities empowers soft robotic systems with on‐demand morphing traits, as well as aerospace ...
Lei Wu, Shujia Chen, Ali Elias Acha, Damiano Pasini   +3 more
wiley   +1 more source

Optimizing intra-layer data communication with adaptive beamforming for proactive flow control in wireless network-on-chip

EURASIP Journal on Wireless Communications and Networking
WiNoC establishes itself as a prospective architectural solution which delivers swift communication capabilities to multi-core systems. Multi-layer system efficiency depends on the development of advanced intra-layer communication techniques because data
T. R. Dinesh Kumar, S. Lokesh, B. Sathyasri   +2 more
doaj   +1 more source

Efficient 2D adaptive beamforming algorithm based on sparse array optimisation

The Journal of Engineering, 2019
In this study, a 2D adaptive beamforming algorithm for sparse array is proposed. Firstly, a signal model based on matrix completion theory for adaptive beamforming in sparse array is established, which is proved to satisfy null space property.
Chaoyu Wang, Can Zhu, Chunlin Chen, Hongtao Li   +3 more
doaj   +1 more source

Design and Fabrication of High Dielectric GRIN Lens for a Directive Antenna Using a Hybrid Filled Voxel Additive Manufacturing Technique

Advanced Materials Technologies, EarlyView.
Hybrid‐filled voxel AM enables integration of high‐permittivity materials into additively manufactured devices. Using this approach, a graded refractive index (GRIN) lens is demonstrated, achieving a 50% antenna size reduction with enhanced directivity.
Qianfang Zheng, Anna Radkovskaya, Kailun Xu, Ekaterina Shamonina, Patrick S. Grant   +4 more
wiley   +1 more source

Low-Complexity Robust Capon Beamforming Based on Reduced-Rank Technique

Journal of Electrical and Computer Engineering, 2015
Existing robust Capon beamformers achieve robustness against steering vector errors at a high cost in terms of computational complexity. Computationally efficient robust Capon beamforming approach based on the reduced-rank technique is proposed in this ...
Zaifang Xi, Xiao-feng Wu, Shuyue Wu, Zhijun Tang, Shigang Hu   +4 more
doaj   +1 more source