how can i do recursive DFT for a measured signal in simulink?

i have in simulink a discrete decaying sinusoidal signal so its frequency is not constant and dont know how can i do a recursive discrete fourier transform for this signal in simulink to increase number of samples from 32 samples per fundemental frequency to 38 samples per cycle at 50 HZ (the measurement window is increased in integral steps of 32, 33, 34, 35, 36, 37 to 38 samples as the frequency is decreasing from 60 Hz to 50 Hz) i wnant know how can i do a total of seven recursive DFT calculations(one for each of the sample window lengths) in parallel and the appropriate phasors are selected based on the measured frequency.

thanks for all