algorithm - MATLAB 1-D Pseudo Wigner Distribution -

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i'm trying implement 1-d pseudo wigner distribution. distribution has expression:

enter image description here

where n , k represent time , frequency, m shifting parameter. z[n] vector , z* complex conjugate. author of article

it can interpreted discrete fourier transform of product z[n+m]z*[n-m].

i know smartest , fastest way implement (in particular product z[m+n]z*[n-m], if can apply fft) because need use expression lot of times. appreciated!


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