IFFT for bandpass data

I would like to know what is the correct method to transform bandpass data in the frequency domain into the time domain using IFFT in Matlab? Assuming I have 101 discrete complex raw data in frequency domain, ranging from 5GHz to 10 GHz, I would like to know what is the time domain response of this bandpass data. I would like to know any of this method correct or could you please tell me what is the right way of performing IFFT for bandpass signal.

1. Simply taking IFFT of frequency domain complex data, assuming 5GHz is the DC point or starting point.

2. Flip and conjugate the raw data for negative frequency component, then apply ifftshift and and ifft.

3. Zero padd from DC to 5GHz, then followed by step 2.

Thank you.

Answer 1

[Walter Roberson]

I would not recommend doing this with ifft. I would recommend you use the Non-uniform FFT File Exchange contribution.