Results 11 to 20 of about 123,247 (141)

Iterative robust adaptive beamforming

EURASIP Journal on Advances in Signal Processing, 2017
The minimum power distortionless response beamformer has a good interference rejection capability, but the desired signal will be suppressed if signal steering vector or data covariance matrix is not precise. The worst-case performance optimization-based
Yang Li, Hong Ma, Li Cheng
doaj   +3 more sources

Domain Adaptation for Ultrasound Beamforming [PDF]

arXiv, 2020
Ultrasound B-Mode images are created from data obtained from each element in the transducer array in a process called beamforming. The beamforming goal is to enhance signals from specified spatial locations, while reducing signal from all other locations. On clinical systems, beamforming is accomplished with the delay-and-sum (DAS) algorithm.
Matthew Berger, Adam Luchies, Christopher Khan, Brett Byram, Jaime Tierney   +4 more
arxiv   +5 more sources

Robust Adaptive Transmit Beamforming under the Constraint of Low Peak-to-Average Ratio

Sensors, 2022
In radar detection, in order to make the beam have variable directivity, a Capon beamformer is usually used. Although this traditional beamformer enjoys both high resolution and good interference suppression, it usually leads to high sidelobe and is ...
Hongtao Li, Zhoupeng Ding, Sirui Tian, Songpo Jin   +3 more
doaj   +1 more source

Fixed and adaptive beamforming improves speech perception in noise in cochlear implant recipients equipped with the MED-EL SONNET audio processor. [PDF]

PLoS ONE, 2018
To determine the impact of the fixed and adaptive beamforming technology of the new MED-EL SONNET cochlear implant audio processor on speech perception in noise.The study cohort comprises 18 postlingually deafened adult cochlear implant recipients with ...
Clemens Honeder, Rudolfs Liepins, Christoph Arnoldner, Hana Šinkovec, Alexandra Kaider, Erich Vyskocil, Dominik Riss   +6 more
doaj   +1 more source

Mapping Interictal activity in epilepsy using a hidden Markov model: A magnetoencephalography study

Human Brain Mapping, Volume 44, Issue 1, Page 66-81, January 2023., 2023
In this study, we use hidden Markov modeling (HMM) to create a unique statistical model of interictal brain activity for 10 pediatric epilepsy patients. This data‐driven model produces an output unique to each patient, and is used to localize the epileptogenic area(s).
Zelekha A. Seedat, Lukas Rier, Lauren E. Gascoyne, Harry Cook, Mark W. Woolrich, Andrew J. Quinn, Timothy P. L. Roberts, Paul L. Furlong, Caren Armstrong, Kelly St. Pier, Karen J. Mullinger, Eric D. Marsh, Matthew J. Brookes, William Gaetz   +13 more
wiley   +1 more source

Robust transmission design for artificial noise aided multiuser broadcast system in inaccurate channel state information scenario with users of different importance

IET Communications, Volume 17, Issue 2, Page 171-182, January 2023., 2023
Abstract In this article, robust beamforming (BF) and artificial noise (AN) design method is proposed for multiuser broadcast secure transmission under secrecy outage probability (SOP) constraints. A special scenario is assumed that the transmitter cannot obtain the accurate channel state information (CSI) of the users' channel, and different users ...
Li Yao, Youjiang Liu, Jian Zhang, Yudong He   +3 more
wiley   +1 more source

Advanced beamformers for cochlear implant users: acute measurement of speech perception in challenging listening conditions. [PDF]

PLoS ONE, 2014
OBJECTIVE: To investigate the performance of monaural and binaural beamforming technology with an additional noise reduction algorithm, in cochlear implant recipients.
Andreas Buechner, Karl-Heinz Dyballa, Phillipp Hehrmann, Stefan Fredelake, Thomas Lenarz   +4 more
doaj   +1 more source

Adaptive beamforming for photoacoustic imaging [PDF]

Optics Letters, 2008
An adaptive photoacoustic image reconstruction technique that combines coherence factor (CF) weighting and the minimum variance (MV) method is introduced. The backprojection method is widely used to reconstruct photoacoustic tomography images. Owing to the scattering of light, the quality of the photoacoustic imaging can be degraded.
Salavat R. Aglyamov, Andrei B. Karpiouk, Stanislav Emelianov, Suhyun Park   +3 more
openaire   +3 more sources

Superior Implementation of Accelerated QR Decomposition for Ultrasound Imaging

IEEE Access, 2020
In this work, a novel Minimum Variance Distortion less Response (MVDR) beamformer architecture in which the adaptive weight vector is computed based on modified Column wise Givens Rotation (CGR) is presented.
S. G. Sreejeesh, R. Sakthivel, Jayaraj U. Kidav   +2 more
doaj   +1 more source

Minimum variance beamforming combined with covariance matrix-based adaptive weighting for medical ultrasound imaging

BioMedical Engineering OnLine, 2022
Background The minimum variance (MV) beamformer can significantly improve the image resolution in ultrasound imaging, but it has limited performance in noise reduction.
Yuanguo Wang, Yadan Wang, Mingzhou Liu, Zhengfeng Lan, Chichao Zheng, Hu Peng   +5 more
doaj   +1 more source