The dynamical formulation of the optimal transport problem, introduced by J. D. Benamou and Y. Brenier, corresponds to the time-space search of a density and a momentum minimizing a transport energy between two densities. In order to solve this problem, an algorithm has been proposed to estimate a saddle point of a Lagrangian. We will study the con...
This paper presents a generative approach to speech enhancement based on a recurrent variational autoencoder (RVAE). The deep generative speech model is trained using clean speech signals only, and it is combined with a nonnegative matrix factorization noise model for speech enhancement. We propose a variational expectation-maximization algorithm w...
International audience
The ability of an adaptive ultrasonic imaging procedure to inspectinside unknown anisotropic nuclear steels, such as V-shape welds or cladded components, is investigated herein. Theoptimization scheme combines the Total Focusing Method (TFM) imaging algorithm with a customizedgradient ascent method in order to improve both the quality and reliabili...
Channel estimation is of paramount importance in most communication systems in order to maximize data rate. In modern systems, the possibly large number of transmit/receive antennas and subcarriers makes this task difficult. Several parametric models, either linear or nonlinear, have thus been proposed to ease channel estimation by reducing the dim...
Time-harmonic transverse-magnetic electromagneticprobing of a grid-like, finite set of infinitely long circularcylindrical dielectric rods affected by missing ones is investigated.Sub-wavelength distances between adjacent rods and subwavelengthrod diameters are assumed and it leads to a severechallenge due to need of super-resolution within the pre...
Since tree roots are important to ecosystems, particularlyin the context of global climate change, better understandingtheir organization is necessary. Ground-penetrating radar(GPR) appears a useful tool to that effect. In this contribution, anovel processing procedure to reconstruct 3D root architecturesfrom GPR data in heterogeneous environments ...
This paper analyzes different methods to simulate sea surface waves over a large area rapidly and with low computational complexity. Indeed, for wind speed between 1 and 10 m/s, the area of the sea surfaces must range from 10 to 92, 000m2 to account for all the surface roughness scales which can contribute to the scattering process at microwave fre...
In this work, we investigate direction nding in the presence of sensor gain uncertainties and directional perturbations for sensor array processing in a multi-frequency scenario. Specically, we adopt a distributed optimization scheme in which coherence models are incorporated and local agents exchange information only between connected nodes in the...
