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arXiv 1507.01308cs.ITmath.IT
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最小假设条件下盲解卷积的可辨识性和稳定性

Identifiability and Stability in Blind Deconvolution under Minimal Assumptions

Yanjun Li, Kiryung Lee, Yoram Bresler

摘要:

盲解卷积(BD)在许多应用中出现。如果没有对信号和滤波器的假设,BD不承认唯一的解决方案。在实践中,子空间或稀疏性假设已经显示出减少搜索空间并产生唯一解的能力。然而,现有的理论分析的唯一性在BD是相当有限的。在早期的论文中,我们提供了第一个代数样本复杂性的BD,几乎所有的基地或框架。我们证明了对于$\mathbb{C}^n$中一对向量的BD,分别具有维度$m_1$和$m_2$的子空间约束,$n\geq m_1m_2$的样本复杂度是足够的。这个结果是次优的,因为自由度的数量仅仅是$m_1+m_2-1$。我们提供了类似的结果,具有类似的次优性,BD稀疏或混合子空间和稀疏约束。在本文中,利用信息理论的限制,唯一的低秩矩阵恢复的最新进展,我们终于弥合这一差距,并得出一个最佳的样本复杂度结果BD与通用基地或框架。我们表明,对于BD的任意对(分别。所有对)的矢量,具有稀疏级别$\mathbb{C}^n$和$s_2$的稀疏约束,$n > s_1+s_2$的样本复杂度(分别为$n > 2(s_1+s_2)$)就足够了。我们也提出了类似的结果BD与子空间约束或混合约束,子空间维数取代稀疏水平。最后但并非最不重要的是,在所有上述场景中,如果基或帧遵循本文中指定的概率分布,则在相同的样本复杂度下,恢复不仅是唯一的,而且对于测量中的小扰动也是稳定的。

英文摘要:

Blind deconvolution (BD) arises in many applications. Without assumptions on the signal and the filter, BD does not admit a unique solution. In practice, subspace or sparsity assumptions have shown the ability to reduce the search space and yield the unique solution. However, existing theoretical analysis on uniqueness in BD is rather limited. In an earlier paper, we provided the first algebraic sample complexities for BD that hold for almost all bases or frames. We showed that for BD of a pair of vectors in $\mathbb{C}^n$, with subspace constraints of dimensions $m_1$ and $m_2$, respectively, a sample complexity of $n\geq m_1m_2$ is sufficient. This result is suboptimal, since the number of degrees of freedom is merely $m_1+m_2-1$. We provided analogus results, with similar suboptimality, for BD with sparsity or mixed subspace and sparsity constraints. In this paper, taking advantage of the recent progress on the information-theoretic limits of unique low-rank matrix recovery, we finally bridge this gap, and derive an optimal sample complexity result for BD with generic bases or frames. We show that for BD of an arbitrary pair (resp. all pairs) of vectors in $\mathbb{C}^n$, with sparsity constraints of sparsity levels $s_1$ and $s_2$, a sample complexity of $n > s_1+s_2$ (resp. $n > 2(s_1+s_2)$) is sufficient. We also present analogous results for BD with subspace constraints or mixed constraints, with the subspace dimension replacing the sparsity level. Last but not least, in all the above scenarios, if the bases or frames follow a probabilistic distribution specified in the paper, the recovery is not only unique, but also stable against small perturbations in the measurements, under the same sample complexities.

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