Results 61 to 70 of about 3,716 (175)
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 +8 more
wiley +1 more source
The Power Gain Difference Method Analysis
Sensors, 2020 In this paper, we propose a new approach to passively locate the 3D position of a signal source. This novel technique, called the power gain difference (PGD), is based only on measuring the received signal strength (RSS) with multiple sensors deployed in
Jiří Veselý +2 more
doaj +1 more source
The Cramer-Rao lower bound and its extensions
, 1989 Bibliography: p. 87-91.
openaire +2 more sources
Doppler stretch and delay Cramer-Rao lower bound for signal with large bandwidth
Известия высших учебных заведений России: Радиоэлектроника, 2016 In this paper Cramer-Rao lower bound of joint Doppler stretch and delay estimation for wideband signal is derived. We use wideband term to denote cases in which narrowband signal model is inappropriate.
I. V. Gogolev
doaj
Existence of unbiased estimators in discrete quantum systems
Physical Review ResearchThe Cramér-Rao bound serves as a crucial lower limit for the mean square error of an estimator in frequentist parameter estimation. Paradoxically, it requires highly accurate prior knowledge of the estimated parameter for constructing the optimal ...
Javier Navarro +2 more
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Modified Cramer-Rao lower bound for symbol width estimation from a phase-shift-keying signal
Tongxin xuebao, 2009 The modified Cramer-Rao lower bound（MCRB） on symbol width estimation of a phase-shift-keying signal was derived.When calculating the integration of the square of dirac delta function δ（t ）, Parseval’s theorem was used to transform the computation from ...
DENG Zhen-miao, LIU Yu
doaj +2 more sources
Cramer-Rao lower bound on doppler frequency of coherent pulse trains
2008 IEEE International Conference on Acoustics, Speech and Signal Processing, 2008 This paper derives the Cramer-Rao lower bound (CRLB) on estimates of the frequency of a coherent pulse-train passively intercepted at a moving antenna. Such estimates are used to locate the transmitting radar. Although frequency estimation algorithms for pulse trains have been proposed, no results were previously available for the CRLB; thus, it has ...
J. Andrew Johnson, Mark L. Fowler
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Optimal sensing on an asymmetric exceptional surface
Physical Review ResearchWe study the connection between exceptional points (EPs) and optimal parameter estimation, in a simple system consisting of two counterpropagating traveling wave modes in a microring resonator.
Robert L. Cook +2 more
doaj +1 more source
Location Awareness in 5G Networks Using RSS Measurements for Public Safety Applications
IEEE Access, 2017 One of the notable aspects of public safety applications in 5G networks is location awareness, which is a feature of contemporary technology that imparts details about a user`s geographical location to another user or application. Mobile users take their
Muhammad Alee Khan +3 more
doaj +1 more source
Autonomous Tracking of Intermittent RF Source Using a UAV Swarm
IEEE Access, 2018 The localization of a radio-frequency transmitter with intermittent transmissions is considered via a group of unmanned aerial vehicles (UAVs) equipped with omnidirectional received signal strength sensors.
Farshad Koohifar +2 more
doaj +1 more source