symmetric FFT in matlab

Question

I'm going to implement OFDM system in matlab. I need to take IFFT symmetric from data and then again FFT from results. the IFFT goes right, but the FFT doesn't, fisrt half of result numbers are like data bef0r IFFT, but second half is wrong. I just don't know should I use FFT function when I know the IFFT took 'symmetric'.

here is the functions I used:

x_ifft=ifft(x1, 'symmetric')    
x_fft=fft(x_ifft);

Thank you

@Jigg Yes, numbers are complex in freq domain, I need symmetric IFFT and then FFT. — Beh, Nov 14 '13 at 20:30
Have you looked at `fftshift`? Using this function might solve your problem. — Cape Code, Nov 14 '13 at 20:47

score 0 · Answer 1 · answered Mar 28 '14 at 20:16

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You should not use "symmetric", but should use fftshift either after ifft or after fft.

answered Mar 28 '14 at 20:16

Daniel

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symmetric FFT in matlab

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