Results 41 to 50 of about 798,977 (204)

Multi‐Vendor and Multi‐Site Characterization of 13C Coils for Clinical Studies

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Due to the inherently low signal‐to‐noise ratio (SNR) domain for 13C imaging, optimal coil performance is essential to maximize data quality. Quality control (QC) for 13C coils employed in magnetic resonance spectroscopy (MRS) is of paramount importance.
Emil S. Christensen, Andreas Clemmensen, Esben S. S. Hansen, Jonathan Birchall, Mary A. McLean, Christoffer Laustsen, Andreas Kjaer, Thomas L. Andersen   +7 more
wiley   +1 more source

Performance Analysis for Continuous Antennas in Rician Channels

IEEE Wireless Communications Letters
Antenna arrays with discrete antenna elements have been conventionally used in multiple-input multiple-output (MIMO) communications. Improved spectral efficiency resulting from more antenna elements has motivated the idea of packing very large numbers of elements in an array, yielding continuous-like antennas. This paper conducts a performance analysis
Smith, PJ, Khordad, E, Senanayake, R, Coon, JP   +3 more
openaire   +3 more sources

Relationship Between Mean Kärger Model Water Exchange Rate and Intercellular Water Transition Rate

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To derive a quantitative relationship between the mean Kärger model (KM) water exchange rate and the mean intercellular water transition rate applicable to brain and other complex biological tissues. Theory and Methods The mean KM water exchange rate applies to any KM, accommodates an arbitrary number of compartments, and can be ...
Jens H. Jensen, Hunter G. Moss, Thorsten Feiweier, Andreana Benitez   +3 more
wiley   +1 more source

Performance of MHPM in Rician and Rayleigh Fading Mobile Channels [PDF]

, 1997
This paper evaluates the error probability of the rectangular frequency pulse multi-h modulation (MHPM) scheme in slowly-fading, frequency-nonselective or frequency-selective Rician and Rayleigh channels.
Xiong, Fuqin, Bgatnyket, S
core   +1 more source

Respiratory‐Resolved Isotropic 3D T1 Mapping of the Carotid Vessel Wall With B1+ Correction (CARISMAT1C)

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To develop, optimize, and characterize a respiratory motion‐resolved free‐running isotropic 3D carotid vessel wall T1 mapping technique named CARISMAT1C. Methods An inversion‐recovery gradient‐echo free‐running pulse sequence with interleaved double flip‐angle (2FA) was implemented, and an extended‐phase‐graph dictionary was used to ...
Isabel Montón Quesada, Céline Hirsch, Pauline Calarnou, Jean‐Baptiste Ledoux, Jérôme Yerly, Christopher W. Roy, Augustin C. Ogier, Ruud B. van Heeswijk   +7 more
wiley   +1 more source

Performance of Rate Splitting Multiple Access-based Visible Light Communications with Residual Interference and Channel Estimation Errors

Journal of Communications Software and Systems
Rate splitting multiple access (RSMA) is a powerful and upcoming multiple access technique that can serve as a promising technology for 5G and beyond applications.
Sundaresan Sabapathy, Surendar Maruthu
doaj   +1 more source

Combined diversity and improved energy detection in cooperative spectrum sensing with faded reporting channels

Journal of King Saud University: Computer and Information Sciences, 2016
In this paper we evaluate the performance of cooperative spectrum sensing (CSS) where each cognitive radio (CR) employs an improved energy detector (IED) with multiple antennas and uses selection combining (SC) for detecting the primary user (PU) in ...
Srinivas Nallagonda, Sanjay Dhar Roy, Sumit Kundu   +2 more
doaj   +1 more source

Low‐Complexity Hybrid Beamforming for LEO Satellites: Beam Update Rate Analysis and Advanced Adaptive Precoding

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Low Earth Orbit (LEO) satellite constellations offer unprecedented opportunities for global broadband connectivity but pose significant beamforming challenges due to rapid platform motion and stringent onboard hardware constraints. Fully digital architectures, while optimal in theory, remain impractical for satellite payloads, motivating ...
Mohammad Momani, Thomas Delamotte, Andreas Knopp   +2 more
wiley   +1 more source

Achievable Rates for Full-Duplex Massive MIMO Systems Over Rician Fading Channels

IEEE Access, 2018
We study the uplink and downlink achievable rate of full-duplex large-scale multi-input multioutput (MIMO) systems with a base station (BS) and users over Rician fading channels, based on maximum ratio combining/maximum ratio transmission and zero ...
Juan Liu, Jianxin Dai, Jin-Yuan Wang, Junxi Zhao, Chonghu Cheng   +4 more
doaj   +1 more source

Integrating Image Segmentation and Deep Learning to Improve Radio Frequency Propagation Models

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper proposes a multi‐sensor approach to improve radio frequency (RF) propagation models, which play a key role in the rapidly expanding field of connected vehicle technology. Focusing on the 1‐ to 20‐GHz frequency range, which is critical for both satellite‐to‐vehicle and base station‐to‐vehicle communications, our study introduces a ...
Jonathan Israel, Xavier Boulanger, Vegard Arneson   +2 more
wiley   +1 more source