What is Wavelet packet transform (WPT) time complexity

2013 11 17
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更新时间：2013 11 17
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HI, I have read in many papers that time complexity of WPT is O(N.LogN), but I would like to know what is the effect of Levels in the time complexity. It must be either
O(2^(L+1).*NlogN)
or O(2^(L).NlogN)
or O(L*NlogN).
% L is number of decomposition levels
can anyone helps which is true?

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