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arXiv 1904.11596cs.ITmath.IT
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球面和旋转群上的传感矩阵设计与稀疏恢复

Sensing Matrix Design and Sparse Recovery on the Sphere and the Rotation Group

Arya Bangun, Arash Behboodi, Rudolf Mathar

摘要:

在本文中,{的目标是设计确定性的采样模式上的球和旋转组},从而,构造感测矩阵的稀疏恢复带限函数。首先证明了由Wigner D-函数的随机样本组成的随机感知矩阵在适当的预处理下满足限制等距性(RIP),并且可以用于旋转群上的稀疏恢复。然而,互相关是用来评估性能的确定性和定期的传感矩阵。我们发现,许多广泛使用的常规采样模式产生的传感矩阵最坏的可能的互相关,因此是不可取的稀疏恢复。使用量子力学中的角动量分析工具,我们提供了一个新的表达的相互相干性,这鼓励使用规则的高程样本。我们构造低相干确定性矩阵固定的定期样本的仰角和最小化的方位角偏振选择的相互相干。结果表明,一旦高程采样是固定的,互相关有一个下限,只依赖于高程样本。然而,这个下限,可以实现球谐函数,这导致新的传感矩阵具有更好的相干性比其他代表性的常规采样模式。这也反映在我们的数值实验中,我们提出的采样模式完全匹配随机采样模式的相变。

英文摘要:

In this paper, {the goal is to design deterministic sampling patterns on the sphere and the rotation group} and, thereby, construct sensing matrices for sparse recovery of band-limited functions. It is first shown that random sensing matrices, which consists of random samples of Wigner D-functions, satisfy the Restricted Isometry Property (RIP) with proper preconditioning and can be used for sparse recovery on the rotation group. The mutual coherence, however, is used to assess the performance of deterministic and regular sensing matrices. We show that many of widely used regular sampling patterns yield sensing matrices with the worst possible mutual coherence, and therefore are undesirable for sparse recovery. Using tools from angular momentum analysis in quantum mechanics, we provide a new expression for the mutual coherence, which encourages the use of regular elevation samples. We construct low coherence deterministic matrices by fixing the regular samples on the elevation and minimizing the mutual coherence over the azimuth-polarization choice. It is shown that once the elevation sampling is fixed, the mutual coherence has a lower bound that depends only on the elevation samples. This lower bound, however, can be achieved for spherical harmonics, which leads to new sensing matrices with better coherence than other representative regular sampling patterns. This is reflected as well in our numerical experiments where our proposed sampling patterns perfectly match the phase transition of random sampling patterns.

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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