Results 71 to 80 of about 1,259,174 (207)

Exact BER Performance of Asynchronous MC-DS-CDMA over Fading Channels

, 2010
In this contribution an accurate average Bit Error Rate (BER) formula is derived for MC-DS-CDMA in the context of asynchronous transmissions and random spreading sequences. We consider a flat Nakagami-m fading channel for each subcarrier. Our analysis is
Smida, Besma, Affes, Sofiene, Hanzo, Lajos   +2 more
core   +1 more source

DETERMINATION OF DEPENDENCE OF ENERGY STEALTH COEFFICIENT OF SATELLITE COMMUNICATION SYSTEMS AT SIGNAL DETECTION FROM CHOICE OF OPERATING FREQUENCY ON THE BASIS OF NUMERICAL METHODS FOR SOLVING NONLINEAR EQUATIONS

Современная наука и инновации, 2022
In the article on the basis of results of signal detection in a channel with the Rician fading, analysis of depth of fadings in a transionospheric radio channel and numerical methods of solving nonlinear equations, developed a methodology of estimation ...
Alexey Vladimirovidi Lyakhov
doaj  

Resolving cognitive heterogeneity in white matter hyperintensities through integrated analyses of microbiome, metabolome, and brain glymphatic function

Alzheimer's &Dementia, Volume 22, Issue 2, February 2026.
Abstract INTRODUCTION Individuals with similar white matter hyperintensities (WMH) burden show heterogeneous cognitive outcomes, yet the biological mechanisms underlying this variability remain incompletely understood. METHODS We integrated 16S rDNA sequencing, untargeted metabolomics, and multi‐modal magnetic resonance imaging (MRI) to comprehensively
Xiaotao Xu, Xia Zhou, Mengwei Zhang, Jingjing Fang, Zhiqing Yan, Xiaoqun Zhu, Yongqiang Yu, Jiajia Zhu   +7 more
wiley   +1 more source

A Unified Approach to the Analysis of Multicarrier DS-CDMA over Nakagami-$M$ Fading Channels

, 2001
A class of unified multicarrier DS-CDMA (MC DS-CDMA) schemes is defined and its performance is considered over multipath Nakagami-$M$ fading channels. The spacing between two adjacent subcarriers of the unified MC DS-CDMA scheme is a variable, allowing ...
Yang, L-L., Hanzo, L.
core   +1 more source

A Spatially Consistent MIMO Channel Model With Adjustable K Factor

IEEE Access, 2019
In the area of research on massive multiple-input multiple-output (MIMO), two assumptions on the wireless channel dominate channel modeling. Either, a rich scattering environment is assumed and the channel is modeled as i.i.d. Rayleigh fading, or, a line
Stefan Pratschner, Thomas Blazek, Erich Zochmann, Fjolla Ademaj, Sebastian Caban, Stefan Schwarz, Markus Rupp   +6 more
doaj   +1 more source

Diffusion Tensor MRI and Spherical‐Deconvolution‐Based Tractography on an Ultra‐Low Field Portable MRI System

Human Brain Mapping, Volume 47, Issue 2, February 1, 2026.
A Portable ULF scanner (1a) imaged a subject (1b) and phantom (1c) to give T2 (2a) and DW (2b) acquisitions alongside a regularised phantom fieldmap (2c). These were processed to give corrected DTI (3a) and CSD (3b) derivatives and were used for whole‐brain tractography (3c) in a feasible acquisition duration.
James Gholam, Phil Schmid, Joshua Ametepe, Alix Plumley, Leandro Beltrachini, Francesco Padormo, Rui Teixeira, Rafael O'Halloran, Kaloian Petkov, Klaus Engel, Steven C. R. Williams, Sean Deoni, Mara Cercignani, Derek K. Jones   +13 more
wiley   +1 more source

segcsvdPVS: A Convolutional Neural Network‐Based Tool for Quantification of Enlarged Perivascular Spaces (PVS) on T1‐Weighted Images

Human Brain Mapping, Volume 47, Issue 2, February 1, 2026.
segcsvdPVS is a novel convolutional neural network (CNN)‐based perivascular spaces (PVS) segmentation tool for T1‐weighted images based on a hierarchical segmentation framework developed with strategically designed inputs and robust training. It demonstrates high accuracy, consistent performance, and improved detection of age‐related changes in PVS ...
Erin Gibson, Joel Ramirez, Lauren Abby Woods, Stephanie Berberian, Julie Ottoy, Christopher J. M. Scott, Vanessa Yhap, Fuqiang Gao, Roberto Duarte Coello, Maria Valdes Hernandez, Anthony E. Lang, Carmela M. Tartaglia, Sanjeev Kumar, Malcolm A. Binns, Robert Bartha, Sean Symons, Richard H. Swartz, Mario Masellis, Navneet Singh, Bradley J. MacIntosh, Joanna M. Wardlaw, Sandra E. Black, ONDRI Investigators, ADNI, CAHHM Investigators, CAIN Investigators, colleagues from the Foundation Leducq Transatlantic Network of Excellence, Andrew S. P. Lim, Maged Goubran   +28 more
wiley   +1 more source

Exact BER performance of asynchronous MC-DS-CDMA over Nakagami-m fading channels [PDF]

, 2008
In this contribution an accurate average bit error rate (BER) formula is derived for Nakagami-faded MC-DSCDMA in the context of asynchronous transmissions and random spreading sequences.
Smida, Besma, Affes, Sofiene, Besma Smida, Sofiene Affes, Hanzo, Lajos, Lajos Hanzo   +5 more
core   +1 more source

Channel estimation for rician fading with attention mechanism [PDF]

EPJ Web of Conferences
The outdoor terahertz communication channel imposes challenging constraints in the sixth genera- tion (6G), which has attracted researchers to investigate this piece of spectrum band 0.3-10 Thz.
Assabir Abdelkhalek, Aniba Ghassane, Assabir Abdelmoujoud   +2 more
doaj   +1 more source