FFT of Sampled data

Hi all I have a sampled data of the length 1024. the sampling frequency is 400kHz.

I want to split this data in two Vectors. One vector is for the even members and the other one for the even members of the vector.

For each on i want to make separetly an FFT.

Is now the sampling frequency 200 KHZ for each stream?

 % Fs=400
NFFT = 2^nextpow2(length(data)); % Next power of 2 from length of y
I_fft = fft(data,NFFT)/length(data);
Q_fft=fft(data,NFFT)/length(data);
f = Fs/2*linspace(0,1,NFFT/2+1);

I wish you could help...

Answer 1

[Wayne King]

I'm assuming you meant "even and odd". Yes, the sampling frequency is 200 kHz for the downsampled by 2 data.

     Fs = 400e3;
     t = 0:1/Fs:1;
     x = cos(2*pi*50e3*t);
     xeven = x(1:2:end);
     xodd = x(2:2:end);
     xeven_dft = fft(xeven);
     xodd_dft = fft(xodd);