Hi all!

For the 2048 point FFT implementation I have used two 1024 point Radix-4
(Decimation-in-frequency) FFT and for final stage I have used 2048 point
(Decimation-in-time) Radix-2 FFT. 
But outputs are incorrect. 
When input is a pulse at x[i] = {1 when i = 1, 0 otherwise} the real part
of output is cosine with frequency = 2, since I have expected the cosine
with frequency = 1. Likewise for the imaginary part of output.



Thanks for replies.