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arXiv 1911.07428cs.ITmath.ITmath.STstat.TH
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确定性压缩感知矩阵的RIP常数-超越Gershgorin

RIP constants for deterministic compressed sensing matrices-beyond Gershgorin

Arman Arian, Ozgur Yilmaz

摘要:

压缩感知(CS)是一种信号采集范式,同时获取和降低信号的稀疏表示的维数。这是通过收集信号的线性、非自适应测量来实现的,其可以被形式化为将信号与“测量矩阵”相乘。如果测量满足所谓的限制等距属性(RIP),那么它将适合用于压缩感知。虽然广泛的一类随机矩阵证明满足RIP与高概率,明确和确定性的建设已被证明(到目前为止),以满足RIP只有在一个显着次优制度。本文针对基于Paley紧框架的确定性构造,提出了两种基于Gershgorin圆定理的RIP常数估计的改进方法,得到了对由乘法常数限定的Gershgorin界的改进.在一种方法中,我们使用最近的结果的频谱的斜邻接矩阵的定向图。在另一种方法中,我们使用所谓的Dembo界的极端特征值的一个半正定厄米特矩阵。我们还推广这些界限,我们结合新的界限与猜想,我们作出关于分布的二次剩余在有限域中提供一个潜在的路径,以打破所谓的“平方根障碍”-我们提供了一个证明的假设,猜想成立。

英文摘要:

Compressed sensing (CS) is a signal acquisition paradigm to simultaneously acquire and reduce dimension of signals that admit sparse representations. This is achieved by collecting linear, non-adaptive measurements of a signal, which can be formalized as multiplying the signal with a "measurement matrix". If the measurement satisfies the so-called restricted isometry property (RIP), then it will be appropriate to be used in compressed sensing. While a wide class of random matrices provably satisfy the RIP with high probability, explicit and deterministic constructions have been shown (so far) to satisfy the RIP only in a significantly suboptimal regime. In this paper, we propose two novel approaches for improving the RIP constant estimates based on Gershgorin circle theorem for a specific deterministic construction based on Paley tight frames, obtaining an improvement over the Gershgorin bound by a multiplicative constant. In one approach we use a recent result on the spectra of the skew-adjacency matrices of oriented graphs. In the other approach, we use the so-called Dembo bounds on the extreme eigenvalues of a positive semidefinite Hermitian matrix. We also generalize these bounds and we combine the new bounds with a conjecture we make regarding the distribution of quadratic residues in a finite field to provide a potential path to break the so-called "square-root barrier"-we provide a proof based on the assumption that the conjecture holds.

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