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arXiv 1702.03201math.FAcs.NAmath.NA
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调制空间的核定理

Kernel theorems for modulation spaces

Università di Torino(都灵大学);Politecnico di Torino(都灵理工大学)

Elena Cordero, Fabio Nicola

AI总结:

本文研究调制空间上线性算子的连续性,通过核在混合调制空间中的成员资格完全刻画,揭示了调制空间形式在信号处理中的优势。

摘要:

我们研究调制空间的核定理。我们通过核在混合调制空间中的成员资格完全刻画了线性算子在调制空间$M^p$上的连续性,对于每个$1\leq p\leq\infty$。尽管Feichtinger的核定理(作为特殊情况被重新获得)是Schwartz核定理在温分布中的对应物,我们的结果在分布理论中没有对应物。这揭示了调制空间形式在某些方面的优越性,正如Feichtinger为数学信号处理定制的后现代调和分析宣言中所强调的。证明使用了通过Gabor框架离散化问题的必要方式。我们还展示了相应核的算子范数与调制空间范数的等价性。对于在$M^{p,q}$上作用的算子,类似的刻画不被期望,但可以以相同的精神给出有界性的充分条件。

英文摘要:

We deal with kernel theorems for modulation spaces. We completely characterize the continuity of a linear operator on the modulation spaces $M^p$ for every $1\leq p\leq\infty$, by the membership of its kernel to (mixed) modulation spaces. Whereas Feichtinger's kernel theorem (which we recapture as a special case) is the modulation space counterpart of Schwartz' kernel theorem for temperate distributions, our results do not have a couterpart in distribution theory. This reveals the superiority, in some respects, of the modulation space formalism upon distribution theory, as already emphasized in Feichtinger's manifesto for a post-modern harmonic analysis, tailored to the needs of mathematical signal processing. The proof uses in an essential way a discretization of the problem by means of Gabor frames. We also show the equivalence of the operator norm and the modulation space norm of the corresponding kernel. For operators acting on $M^{p,q}$ a similar characterization is not expected, but sufficient conditions for boundedness can be sated in the same spirit.

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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