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arXiv 1503.03184cs.ITmath.IT
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盲解卷积的基本限制第II部分:稀疏性-模糊性权衡

Fundamental Limits of Blind Deconvolution Part II: Sparsity-Ambiguity Trade-offs

Sunav Choudhary, Urbashi Mitra

摘要:

盲解卷积是无线通信、图像处理等应用中普遍存在的非线性逆问题。这个问题通常是不适定的,因为信号的可识别性是一个关键问题,并且已经努力使用稀疏模型来正则化盲反卷积以提高信号的可识别性。这两部分的论文的第一部分建立了一个措施,理论上严格的模糊度空间的特性,盲反卷积和不可识别的这个逆问题下无约束的输入。本文的第二部分分析了经典稀疏盲反卷积问题的可识别性,并在稀疏模糊度权衡缩放定律上建立了令人惊讶的强否定结果。具体地说,规范稀疏盲反卷积的不适定性量化的不可识别的信号集的维数为例。本文的一个重要结论是,典型的稀疏性自然发生在应用中是不够的,编码是必要的盲反卷积信号的可识别性。本文所开发的方法应用于第二跳信道估计问题,以表明子空间编码信号(包括重复编码和几何衰减信号)的家庭是不可识别的盲反卷积。

英文摘要:

Blind deconvolution is an ubiquitous non-linear inverse problem in applications like wireless communications and image processing. This problem is generally ill-posed since signal identifiability is a key concern, and there have been efforts to use sparse models for regularizing blind deconvolution to promote signal identifiability. Part I of this two-part paper establishes a measure theoretically tight characterization of the ambiguity space for blind deconvolution and unidentifiability of this inverse problem under unconstrained inputs. Part II of this paper analyzes the identifiability of the canonical-sparse blind deconvolution problem and establishes surprisingly strong negative results on the sparsity-ambiguity trade-off scaling laws. Specifically, the ill-posedness of canonical-sparse blind deconvolution is quantified by exemplifying the dimension of the unidentifiable signal sets. An important conclusion of the paper is that canonical sparsity occurring naturally in applications is insufficient and that coding is necessary for signal identifiability in blind deconvolution. The methods developed herein are applied to a second-hop channel estimation problem to show that a family of subspace coded signals (including repetition coding and geometrically decaying signals) are unidentifiable under blind deconvolution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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