I hope, you are doing well. I want to ask question about baseband conversion.
- I generated two AM signals in MATLAB, which one of them is shifted in time.
- I multiply the signals with $\cos(2\pi f_c t)$ in order to obtain IF signal.
- I filtered the IF signals with $f_c$ cut-off frequency.
In this way, I aim to downconverted to signal to baseband.
My problem is, when I try to cross-correlated the baseband signals, my result peaks at zero.
I expect to see the delay, but I could not. Am I missing something?
Notes: I am exact sure, my cross-correlation function works perfectly. I tried this function before baseband process. Also, in order to obtain both I and Q components, I try to multiply my signals with sin(2pifc*t). Nothing changes. MessageSignal: Audio Signal.