Results 61 to 70 of about 4,245 (179)

Parallel time-delay estimation algorithm for GMSK mixing signals

Tongxin xuebao, 2011
Parallel time-delay estimation algorithm was proposed for GMSK mixing signals based on linear approxima-tion approach.Parallel estimation equations were built in flat-fading channel according to autocorrelation of over-sampling based mixing signals and ...
RUI Guo-sheng1, XU Bin2, ZHANG Song2
doaj   +2 more sources

Improving polarized neutron reflectometry experiments on soft‐matter samples: optimization of the solid substrate structure

Journal of Applied Crystallography, Volume 59, Issue 4, Page 1192-1199, August 2026.
We demonstrate a Fisher‐information‐based strategy for optimizing the solid substrate structure in polarized neutron reflectometry experiments on soft‐matter samples. The approach identifies magnetic reference layer designs that improve experimentally accessible information and provides a general framework for more efficient reflectometry experiment ...
Ivan P. Yakimenko, Alessandra Luchini, Joshaniel F. K. Cooper, Sebastian Köhler, Tommy Nylander, Sean Langridge, Christy J. Kinane, Andrew J. Caruana, Björgvin Hjörvarsson, Max Wolff, Alexei Vorobiev, Sergiy Valyukh, Fredrik Eriksson, Jens Birch, Kenneth Järrendahl   +14 more
wiley   +1 more source

Value of MRI Outcomes for Preventive and Early‐Stage Trials in Spinocerebellar Ataxias 1 and 3

Annals of Clinical and Translational Neurology, Volume 13, Issue 7, Page 1452-1466, July 2026.
ABSTRACT Objective To examine the value of MRI outcomes as endpoints for preventive and early‐stage trials of two polyglutamine spinocerebellar ataxias (SCAs). Methods A cohort of 100 participants (23 SCA1, 63 SCA3, median Scale for the Assessment and Rating of Ataxia (SARA) score = 5, 42% preataxic, and 14 gene‐negative controls) was scanned at 3T up ...
Thiago J. R. Rezende, Emilien Petit, Young Woo Park, Sophie Tezenas du Montcel, James M. Joers, Jonathan M. DuBois, H. Moore Arnold, Michal Povazan, Ipek Özdemir, Guita Banan, Romain Valabregue, Philipp Ehses, Jennifer Faber, Chiadi U. Onyike, Peter B. Barker, Jeremy D. Schmahmann, Eva‐Maria Ratai, Sub H. Subramony, Thomas H. Mareci, Khalaf O. Bushara, Henry Paulson, Thomas Klockgether, Alexandra Durr, Tetsuo Ashizawa, Christophe Lenglet, Gülin Öz, READISCA Investigators   +26 more
wiley   +1 more source

Radiation‐Absorptive Heat Transport in Buoyancy‐Driven MHD Nanofluids Flow With Cross‐Diffusion and Chemical Interaction Effects Over a Vertical Moving Plate

Asia-Pacific Journal of Chemical Engineering, Volume 21, Issue 4, July/August 2026.
ABSTRACT This article investigates the Soret–Dufour cross‐diffusion effects on radiation‐absorptive unsteady free‐convection of magnetized nanofluids ( TiO2–water and Cu–water) flow over a vertical moving permeable plate. The model integrates thermal source, chemical reactions, porous resistance, and thermal radiation. The water‐based nanofluids mixing
B. Prabhakar Reddy, Jumanne Mng'ang'a, P. V. Kanaka Rao   +2 more
wiley   +1 more source

Metalens‐Enabled Double‐Helix Point Spread Function for Multifunctional Imaging

Advanced Physics Research, Volume 5, Issue 7, July 2026.
A single metalens is employed to generate a double‐helix point spread function (DH‐PSF). At the design wavelength, the PSF rotation angle varies linearly with depth, while the lobe spacing follows an inverse dependence on axial position. At a fixed depth, the lobe spacing further exhibits a linear dependence on wavelength due to dispersion.
Xuanyu Wu, Xuanguang Wu, Liang Zhou, Bingyan Wei, Sheng Liu, Dandan Wen, Yi Zhang, Jianlin Zhao, Peng Li   +8 more
wiley   +1 more source

Joint frequency offset, time offset, and channel estimation for OFDM/OQAM systems

EURASIP Journal on Advances in Signal Processing, 2018
Among the multicarrier modulation techniques considered as an alternative to orthogonal frequency division multiplexing (OFDM) for future wireless networks, a derivative of OFDM based on offset quadrature amplitude modulation (OFDM/OQAM) has received ...
Ali Baghaki, Benoit Champagne
doaj   +1 more source

Analyzing of Cooperative Locating Error and Formation Configuration of AUV Based on Geometric Interpretation

Xibei Gongye Daxue Xuebao, 2020
Because the evaluation of the location performance of AUVs with the lower bound of the Cramer-Rao inequality is not intuitive, the geometric interpretation method is proposed based on geometric ellipse.

doaj   +1 more source

Constrained total least squares localization using angle of arrival and time difference of arrival measurements in the presence of synchronization clock bias and sensor position errors

International Journal of Distributed Sensor Networks, 2019
Based on measurements of angle of arrival and time difference of arrival, a method is proposed to improve the accuracy of localization with imperfect sensors. A derivation of the Cramér–Rao lower bound and the root mean square error is presented aimed at
Ruirui Liu, Ding Wang, Jiexin Yin, Ying Wu   +3 more
doaj   +1 more source

Valid lower bound for all estimators in quantum parameter estimation

New Journal of Physics, 2016
The widely used quantum Cramér–Rao bound (QCRB) sets a lower bound for the mean square error of unbiased estimators in quantum parameter estimation, however, in general QCRB is only tight in the asymptotical limit.
Jing Liu, Haidong Yuan
doaj   +1 more source

Cramér-Rao Bound Study of Multiple Scattering Effects in Target Localization

International Journal of Antennas and Propagation, 2012
The target position information contained in scattering data is explored in the context of the scalar Helmholtz operator for the basic two-point scatterer system by means of the statistical estimation framework of the Fisher information and associated ...
Edwin A. Marengo, Maytee Zambrano-Nunez, Paul Berestesky   +2 more
doaj   +1 more source