I need to time align two complex signals. The two signals obtained were at different RF frequency before digitisation. So,I have two complex signals(IQ) and I need to do delay estimation and apply correction on one of the signal.
Cross-correlating the absolute values of two signals and finding the peak gives one answer while cross-correlating the complex values and then finding the peak from the absolute value of the obtained (complex)correlation gives another peak?
Which method shall I choose? what is the best way forward? Any insight into it?