Thank you very much Martin for your kind reply.
I want to decompose the signal into uniform frequency bands of 50 Hz using WPT with 1600Hz as a sampling frequency and then my goal is to compute the energy in each 50 Hz subband. The calculated energy does not corresponds to the actual energy contents of the signal like 250 Hz energy contents appear in the 350 Hz band etc....
I have attached my work for your reference.