论文标题
在重现内核空间中浓缩信号的随机采样和重建
Random sampling and reconstruction of concentrated signals in a reproducing kernel space
论文作者
论文摘要
在本文中,我们考虑(随机)对信号的(随机)采样集中在公制测量空间的有界开瓶器域$ω$上,并从其(联合国)损坏的采样数据中重建集中信号,以$ω$中包含的采样集进行。我们在重现核空间中的集中信号集上建立了Bi-Lipschitz类型的加权稳定性。 Bi-Lipschitz类型的加权稳定性为采样方案提供了弱的鲁棒性,但是由于集中信号集的非转换性,它并不意味着唯一的信号重建。从(联合国)在包含$ω$中包含的有限采样集上的(联合国)损坏的样品中,我们提出了一种算法,以查找集中在有限的开瓶器域$ω$上的信号的近似值。随机采样是一种抽样方案,其中根据概率分布随机采样位置。接下来,我们表明,有了很高的概率,信号集中在有界的开瓶器域$ω$上,可以从i.i.d的未腐烂(或随机损坏的)样本中重建。如果采样大小至少是$μ(ω)\ ln(μ(ω))$的$ω$的随机位置,其中$μ(ω)$是浓缩域$ω$的度量。最后,我们证明了提出的对原始浓缩信号的近似值的性能,当采样过程以较小的密度或大尺寸随机进行。
In this paper, we consider (random) sampling of signals concentrated on a bounded Corkscrew domain $Ω$ of a metric measure space, and reconstructing concentrated signals approximately from their (un)corrupted sampling data taken on a sampling set contained in $Ω$. We establish a weighted stability of bi-Lipschitz type for a (random) sampling scheme on the set of concentrated signals in a reproducing kernel space. The weighted stability of bi-Lipschitz type provides a weak robustness to the sampling scheme, however due to the nonconvexity of the set of concentrated signals, it does not imply the unique signal reconstruction. From (un)corrupted samples taken on a finite sampling set contained in $Ω$, we propose an algorithm to find approximations to signals concentrated on a bounded Corkscrew domain $Ω$. Random sampling is a sampling scheme where sampling positions are randomly taken according to a probability distribution. Next we show that, with high probability, signals concentrated on a bounded Corkscrew domain $Ω$ can be reconstructed approximately from their uncorrupted (or randomly corrupted) samples taken at i.i.d. random positions drawn on $Ω$, provided that the sampling size is at least of the order $μ(Ω) \ln (μ(Ω))$, where $μ(Ω)$ is the measure of the concentrated domain $Ω$. Finally, we demonstrate the performance of proposed approximations to the original concentrated signal when the sampling procedure is taken either with small density or randomly with large size.