Constrained Hardy space approximation
Constrained Hardy space approximation
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约束 Hardy 空间近似
DOI:
10.1016/j.jat.2010.03.006
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
A. Schneck
中科院分区:
文献类型:
--
作者:
A. Schneck
We consider the problem of minimizing the distance [Formula: see text] , where K is a subset of the complex unit circle ∂D and ϕ∈C(K), subject to the constraint that f lies in the Hardy space Hp(D) and |f|≤g for some positive function g. This problem occurs in the context of filter design for causal LTI systems. We show that the optimization problem has a unique solution, which satisfies an extremal property similar to that for the Nehari problem. Moreover, we prove that the minimum of the optimization problem can be approximated by smooth functions. This makes the problem accessible for numerical solution, with which we deal in a follow-up paper.
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通讯作者:
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DOI:
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发表时间:
2009
期刊:
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