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Nous avons constaté empiriquement que sur certains types deprobì emes simulés, en l'absence de bruit, le support de la solution x obtenue en sortie de SBR co¨?ncideco¨?ncide avec celui de la vraie solution x * (` a partir de laquelle les donnees y = Ax * ontétéontété simulées) pourvu que ? soit suffisamment faible. Les simulations que nous avons effectuées sur unprobì eme de déconvolution impulsionnelle (séparation de deux signaux gaussiensàgaussiensà supports non disjoints) montrent que sans bruit, SBR conduitàconduità une reconstruction exacte d` es lors que la valeur de ? est suffisamment faible, quel que soit la distance entre les deux signaux gaussiens. Ces résultats pratiques appellent uné etude théorique (non encore réalisée), dans le but de confirmer que sous certaines hypothèses sur la matrice A et sur le signal x * ` a reconstruire ,
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des algorithmes sous-optimaux sont proposés pour leprobì eme de l'approximation parcimonieuse basée sur la pseudo-norme 0 : l'algorithme Single Best Replacement (SBR) est un algorithme itératif de type " ajout-retrait " inspiré d'algorithmes existants pour la restauration de signaux Bernoulli-gaussiens. L'algorithme Continuation Single Best Replacement (CSBR) est un algorithme permettant de fournir des approximationsàapproximationsà des degrés de parcimonie variables. Nous proposons aussi un algorithme de séparation de sources parcimonieusesàparcimonieusesà partir de mélanges avec retards, basé sur l'application préalable de l'algorithme CSBR sur chacun des mélanges ,