Re: FFT Spectrum Analyzer using Digitizer

Hi,

I use a similar setup with Rohde&Schwarz IQ generator and vector signal
analyzer (not that it matters, any equipment will give essentially the
same result).

If you don't have any bugs in your code, there are two things that can go
easily wrong:

- You need to synchronize the clocks of both instruments, otherwise
frequency offset results.
- If possible, handle a full cycle length of your signal - in other words,
use only sine waves that have a full number of cycles within the
measurement time window.

Getting the phase of the received sine wave is trivial without FFT:
multiply the received signal with the conjugate of the transmitted signal,
sum up and take the phase.

If you want to do deeper analysis, I use the following code to align
transmitted and received signal, because hardware sync is not accurate
enough for my purposes:

http://www.dsprelated.com/showarticle/26.php

Cheers

Markus
.

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