Results 21 to 30 of about 5,561,714 (285)

A review on principles, performance and complexity of linear estimation and detection techniques for MIMO systems

open access: yesFrontiers in Communications and Networks, 2023
The advent of the fifth generation (5G) of mobile networks has introduced several new use cases that are pushing mobile networks in environments that are typically supported by wired technologies.
Danilo Gaspar   +2 more
doaj   +1 more source

Enhanced Estimation of a Noisy Quantum Channel Using Entanglement [PDF]

open access: yes, 2001
We discuss the estimation of channel parameters for a noisy quantum channel - the so-called Pauli channel - using finite resources. It turns out that prior entanglement considerably enhances the fidelity of the estimation when we compare it to an ...
Cirone, Markus A.   +3 more
core   +2 more sources

Trends in anthropogenic ammonia emissions in China since 1980: A review of approaches and estimations

open access: yesFrontiers in Environmental Science, 2023
Ammonia (NH3) emissions from intensive anthropogenic activities is an important component in the global nitrogen cycle that has triggered large negative impacts on air quality and ecosystems worldwide.
Jianan Chen   +8 more
doaj   +1 more source

Piecewise convex function estimation: pilot estimators [PDF]

open access: yesThe Annals of Statistics, 1997
Given noisy data, function estimation is considered when the unknown function is known a priori to consist of a small number of regions where the function is either convex or concave. When the number of regions is unknown, the model selection problem is to determine the number of convexity change points.
openaire   +4 more sources

Compressive Parameter Estimation for Sparse Translation-Invariant Signals Using Polar Interpolation [PDF]

open access: yes, 2015
We propose new compressive parameter estimation algorithms that make use of polar interpolation to improve the estimator precision. Our work extends previous approaches involving polar interpolation for compressive parameter estimation in two aspects: (i)
Duarte, Marco F.   +2 more
core   +3 more sources

A systematic review of software development cost estimation studies [PDF]

open access: yes, 2007
This paper aims to provide a basis for the improvement of software estimation research through a systematic review of previous work. The review identifies 304 software cost estimation papers in 76 journals and classifies the papers according to research ...
Jørgensen, M, Shepperd, MJ
core   +1 more source

Parameters estimation in quantum optics [PDF]

open access: yes, 2000
We address several estimation problems in quantum optics by means of the maximum-likelihood principle. We consider Gaussian state estimation and the determination of the coupling parameters of quadratic Hamiltonians.
A.S. Holevo   +18 more
core   +3 more sources

Silhouette estimation

open access: yesJournal of the Optical Society of America A, 2014
Silhouettes arise in a variety of imaging scenarios. Pristine silhouettes are often degraded via blurring, detector sampling, and detector noise. We present a maximum a posteriori estimator for the restoration of parameterized facial silhouettes. Extreme dealiasing and dramatic superresolution, well beyond the diffraction limit, are demonstrated ...
Paxman, Richard G   +3 more
openaire   +4 more sources

Robust Estimation of Optical Phase Varying as a Continuous Resonant Process [PDF]

open access: yes, 2013
It is well-known that adaptive homodyne estimation of continuously varying optical phase provides superior accuracy in the phase estimate as compared to adaptive or non-adaptive static estimation.
Huntington, Elanor H.   +2 more
core   +1 more source

Nonparametric estimation of mean-squared prediction error in nested-error regression models [PDF]

open access: yes, 2016
Nested-error regression models are widely used for analyzing clustered data. For example, they are often applied to two-stage sample surveys, and in biology and econometrics.
Hall, Peter, Maiti, Tapabrata
core   +1 more source

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