Note on a Lower Bound on the Linear Complexity of the Fast Fourier Transform

Note on a Lower Bound on the Linear Complexity of the Fast Fourier Transform
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关于快速傅立叶变换线性复杂度下界的注记

DOI:
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发表时间:
1973
期刊:
JACM
影响因子:
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通讯作者:
Jacques Morgenstern
Jacques Morgenstern
中科院分区:
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文献类型:
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作者:
Jacques Morgenstern

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当一个上界<italic>/italic>可以赋给计算中所涉及的复数的模时,给出了用线性算法计算一族线性函数族所需的加法次数的下界。在快速傅立叶变换的情况下,当<italic>c</italic>=1时,下限为(<italic>n</italic>/italic>/log<subscrpt>2</subscrpt><italic>n</italic>)。
A lower bound for the number of additions necessary to compute a family of linear functions by a linear algorithm is given when an upper bound <italic>c</italic> can be assigned to the modulus of the complex numbers involved in the computation. In the case of the fast Fourier transform, the lower bound is (<italic>n</italic>/2) log<subscrpt>2</subscrpt><italic>n</italic> when <italic>c</italic> = 1.