02-27-2020 09:40 AM
Hi,
I am using the PXI-5105 digitizer to obtain some data. Now, without any antenna, I can collect some noise samples by it. I got the samples by the MATLAB. However, I found that the samples are real number. May I know how to obtain some I/Q data or complex number? Thanks so much.
The Figure is some samples I got from 8 channels
08-19-2020 11:04 AM
Hi,
I believe that the way you can recover phase information from a real signal is using the Hilbert transform.
This exists as a function in the signal processing toolkit in LabVIEW (fast Hilbert Transform), and I imagine there's also a function in MATLAB for this.
The Hilbert transform will give you the Q or imaginary part of the data and you would use your original signal as the I or real part of the data.
Here's a screenshot of some simple LabVIEW code that demonstrates this:
Hope this helps.
Regards,
Jonah Winn
NI Technical Support Engineer