Results 41 to 50 of about 97,244 (184)

Reconstruction of the primordial fluctuation spectrum from the five-year WMAP data by the cosmic inversion method with band-power decorrelation analysis

, 2008
The primordial curvature fluctuation spectrum is reconstructed by the cosmic inversion method using the five-year WMAP data of the cosmic microwave background temperature anisotropy. We apply the covariance matrix analysis and decompose the reconstructed
Jun’ichi Yokoyama, K. Sato, Ryo Nagata
core   +1 more source

Linear Shape Deformation Models with Local Support Using Graph-based Structured Matrix Factorisation [PDF]

, 2016
Representing 3D shape deformations by linear models in high-dimensional space has many applications in computer vision and medical imaging, such as shape-based interpolation or segmentation. Commonly, using Principal Components Analysis a low-dimensional
Bernard, Florian, Gemmar, Peter, Goncalves, Jorge, Hertel, Frank, Thunberg, Johan   +4 more
core   +2 more sources

Coprime array‐based robust beamforming using covariance matrix reconstruction technique [PDF]

IET Communications, 2018
A novel robust adaptive beamforming algorithm based on a coprime array is proposed in this study. First, the authors exploit the virtual array structure of the coprime coarray to construct two subspaces. The first subspace is obtained from the covariance matrix of the virtual uniform linear array, whereas the second one is obtained by integrating a ...
Ke Liu, Yimin D. Zhang
openaire   +1 more source

Lower bounds for the minimax risk using $f$-divergences and applications

, 2011
Lower bounds involving $f$-divergences between the underlying probability measures are proved for the minimax risk in estimation problems. Our proofs just use simple convexity facts.
Guntuboyina, Adityanand
core   +1 more source

Fast Underdetermined DOA Estimation Based on Generalized MRA via Original Covariance Vector Sparse Reconstruction

IEEE Access, 2021
Minimum redundancy array (MRA) has the maximum aperture with continuous difference co-array among various sparse arrays with same number of physical sensors, but it is hard to calculate the sensor position of MRA and realize array design by using MRA. To
Geng Wang, Minghao He, Chunlai Yu, Jun Han, Changxiao Chen   +4 more
doaj   +1 more source

On the joint analysis of CMB temperature and lensing-reconstruction power spectra [PDF]

, 2013
Gravitational lensing provides a significant source of cosmological information in modern CMB parameter analyses. It is measured in both the power spectrum and trispectrum of the temperature fluctuations.
Challinor, Anthony, Hanson, Duncan, Lewis, Antony, Schmittfull, Marcel M.   +3 more
core   +1 more source

Quantum characterization of bipartite Gaussian states

, 2010
Gaussian bipartite states are basic tools for the realization of quantum information protocols with continuous variables. Their complete characterization is obtained by the reconstruction of the corresponding covariance matrix.
A. Porzio, Agarwal, Bowen, Bowen, Braunstein, Cerf, D. Buono, Dell’Anno, Drever, Drummond, Duan, D’Ariano, D’Ariano, D’Ariano, D’Auria, D’Auria, D’Auria, D’Auria, D’Auria, Eisert, Englert, Franzen, G. Nocerino, Genoni, Hage, Horodecki, Laurat, Lvovsky, M. G. A. Paris, Mancini, Maniscalco, Ou, Paris, Pirandola, Porzio, Rehàcek, Reid, S. Olivares, Serafini, Serafini, Serafini, Shapiro, Simon, Slepian, Treps, V. D’Auria, Vasile, Vidal, Wang, Wenger, Zhang   +50 more
core   +1 more source

High‐accuracy DOA estimation via parallel sparse nested array with extended aperture and reduced mutual coupling

Electronics Letters, 2023
This letter proposes a novel parallel sparse nested array and then provides a matrix reconstruction‐based method with three steps, to enhance the performance of direction of arrival (DOA) estimation in practice.
Yunlong Yang, Guojun Jiang
doaj   +1 more source

Robust STAP Against Unknown Mutual Coupling Based on Middle Subarray Clutter Covariance Matrix Reconstruction

IEEE Access, 2019
The presence of mutual coupling usually causes space-time steering vector distortion for space-time adaptive processing (STAP) in airborne radar, thereby causing significant performance degradation.
Zhihui Li, Yongshun Zhang, Weijian Liu, Yiduo Guo, Hanwei Liu   +4 more
doaj   +1 more source

Non-Gaussian errors of baryonic acoustic oscillations

, 2012
We revisit the uncertainty in baryon acoustic oscillation (BAO) forecasts and data analyses. In particular, we study how much the uncertainties on both the measured mean dilation scale and the associated error bar are affected by the non-Gaussianity of ...
Blake, Blake, Cole, Coles, Eisenstein, Eisenstein, Eisenstein, Eisenstein, Feldman, Guth, Harnois-Déraps, Hockney, Hütsi, I. MacDonald, J. Harnois-Déraps, Lu, Masui, McDonald, Meiksin, Merz, Miller, Neyrinck, Noh, P. McDonald, Padmanabhan, Percival, Percival, Rimes, Rimes, Scoccimarro, Seo, Seo, Seo, Seo, Seo, Smith, Takahashi, Takahashi, Tegmark, Tegmark, U.-L. Pen, W. Ngan, Yu, Zel’Dovich, Zhang   +44 more
core   +1 more source