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arXiv 1505.03399cs.ITmath.IT
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子空间或稀疏约束下盲反卷积的可辨识性

Identifiability in Blind Deconvolution with Subspace or Sparsity Constraints

Yanjun Li, Kiryung Lee, Yoram Bresler

摘要:

盲解卷积(BD),信号和滤波器给定其卷积的分辨率,出现在许多应用中。没有进一步的限制,BD是不适定的。在实践中,已经施加子空间或稀疏性约束以减小搜索空间,并且已经显示出一些经验上的成功。然而,现有的理论分析的唯一性在BD是相当有限的。作为一种努力,以解决仍然神秘的问题,我们推导出充分的条件下,两个向量可以唯一地确定从他们的循环卷积,受子空间或稀疏性约束。这些充分条件提供了BD的第一个代数样本复杂性。我们首先导出一个适用于几乎所有基或框架的充分条件。对于$\mathbb{C}^n$中的向量的盲去卷积,具有维度$m_1$和$m_2$的两个子空间约束,所需的样本复杂度为$n\geq m_1m_2$。然后,我们施加一个基础上的子带结构,并推导出一个充分条件,涉及一个宽松的样本复杂度$n\geq m_1+m_2-1$,我们证明是最佳的。我们提出了这些结果的扩展BD稀疏约束或混合约束,稀疏水平取代子空间维数。在这种情况下,未知支持的成本是样本复杂度的额外因子2。

英文摘要:

Blind deconvolution (BD), the resolution of a signal and a filter given their convolution, arises in many applications. Without further constraints, BD is ill-posed. In practice, subspace or sparsity constraints have been imposed to reduce the search space, and have shown some empirical success. However, existing theoretical analysis on uniqueness in BD is rather limited. As an effort to address the still mysterious question, we derive sufficient conditions under which two vectors can be uniquely identified from their circular convolution, subject to subspace or sparsity constraints. These sufficient conditions provide the first algebraic sample complexities for BD. We first derive a sufficient condition that applies to almost all bases or frames. For blind deconvolution of vectors in $\mathbb{C}^n$, with two subspace constraints of dimensions $m_1$ and $m_2$, the required sample complexity is $n\geq m_1m_2$. Then we impose a sub-band structure on one basis, and derive a sufficient condition that involves a relaxed sample complexity $n\geq m_1+m_2-1$, which we show to be optimal. We present the extensions of these results to BD with sparsity constraints or mixed constraints, with the sparsity level replacing the subspace dimension. The cost for the unknown support in this case is an extra factor of 2 in the sample complexity.

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