I am trying to implement the following 4-Tap Polyphase window shown in figure below and used in : polyphase filters- radio astronomy: lecture #8 by Prof. Dale E. Gary on Matlab. I have tried splitting the window in time domain after multiplication with Sinc function but has not achieved the sidelobe level and mainlobe width shown in green graph- figure on right. I am not sure what I might be missing here.
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