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COSMO-SkyMed is a Dual – Use program, devoted to produce both civilian and military applications, and as such it is required to have a fast response time, to avoid conflicts and to optimize resources. In order to provide operational continuity to COSMO-SkyMed mission, the Italian Space Agency (ASI) and Italian Ministry of Defense (It-MoD) are conceiving the… (More)

Compressed sensing (CS) is a concept that allows to acquire compressible signals with a small number of measurements. As such it is very attractive for hardware implementations. Therefore, correct calibration of the hardware is a central issue. In this paper we study the so-called blind calibration, i.e. when the training signals that are available to… (More)

- Francesco Caltagirone, Florent Krzakala, Lenka Zdeborová
- 2014 IEEE International Symposium on Information…
- 2014

Approximate message passing is an iterative algorithm for compressed sensing and related applications. A solid theory about the performance and convergence of the algorithm exists for measurement matrices having iid entries of zero mean. However, several authors have observed that for more general matrices the algorithm often encounters convergence… (More)

- Francesco Caltagirone, Silvio Franz, Richard Morris, Lenka Zdeborová
- Physical review. E, Statistical, nonlinear, and…
- 2014

This work is motivated by recent progress in information theory and signal processing where the so-called spatially coupled design of systems leads to considerably better performance. We address relevant open questions about spatially coupled systems through the study of a simple Ising model. In particular, we consider a chain of Curie-Weiss models that are… (More)

- Francesco Caltagirone, Marc Lelarge, Léo Miolane
- 2016 54th Annual Allerton Conference on…
- 2016

We consider the sparse stochastic block model in the case where the degrees are uninformative. The case where the two communities have approximately the same size has been extensively studied and we concentrate here on the community detection problem in the case of unbalanced communities. In this setting, spectral algorithms based on the non-backtracking… (More)

- F Caltagirone, U Ferrari, L Leuzzi, G Parisi, F Ricci-Tersenghi, T Rizzo
- Physical review letters
- 2012

A method is provided to compute the exponent parameter λ yielding the dynamic exponents of critical slowing down in mode coupling theory. It is independent from the dynamic approach and based on the formulation of an effective static field theory. Expressions of λ in terms of third order coefficients of the action expansion or, equivalently, in terms of six… (More)

- Maria Chiara Angelini, Francesco Caltagirone, Florent Krzakala, Lenka Zdeborová
- 2015 53rd Annual Allerton Conference on…
- 2015

We consider the problem of the assignment of nodes into communities from a set of hyperedges, where every hyperedge is a noisy observation of the community assignment of the adjacent nodes. We focus in particular on the sparse regime where the number of edges is of the same order as the number of vertices. We propose a spectral method based on a… (More)

- Francesco Caltagirone, Lenka Zdeborová
- ArXiv
- 2014

—In this paper we address a series of open questions about the construction of spatially coupled measurement matrices in compressed sensing. For hardware implementations one is forced to depart from the limiting regime of parameters in which the proofs of the so-called threshold saturation work. We investigate quantitatively the behavior under finite… (More)

- Eric W. Tramel, Andre Manoel, Francesco Caltagirone, Marylou Gabrié, Florent Krzakala
- 2016 IEEE Information Theory Workshop (ITW)
- 2016

In this work, we consider compressed sensing reconstruction from M measurements of K-sparse structured signals which do not possess a writable correlation model. Assuming that a generative statistical model, such as a Boltzmann machine, can be trained in an unsupervised manner on example signals, we demonstrate how this signal model can be used within a… (More)

- Alaa Saade, Francesco Caltagirone, +4 authors Florent Krzakala
- 2016 IEEE International Conference on Acoustics…
- 2016

Random projections have proven extremely useful in many signal processing and machine learning applications. However, they often require either to store a very large random matrix, or to use a different, structured matrix to reduce the computational and memory costs. Here, we overcome this difficulty by proposing an analog, optical device, that performs the… (More)