Power spectrum estimator -filter bank method

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Dear All;
I am trying to estimate the power spectrum of the attached signal but i am not getting the meaningfull spectrum as shown in the attached figue
any idea ? it show the power spectrum is unifrom which is not true
Mustafa Al-Nasser
Mustafa Al-Nasser on 11 Feb 2021
Thank you for your answer
but the signal is not short , actually when i compute power spectrum using filter bank method all power values are zeros but when i used wlech method , i got values !
in fact the power value that i got is very small in watt which looks for me that filter bank attenuates all values , so which parameters should I change to avoid that

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