Please help understanding the DSP usage of Autocorrelation & Cross-correlation
It seems this is strongly linked to calculating phase offsets, frequency offset for carrier recovery, symbol timing errors, recovery algorithms, what else?
What can I get from Cross-correlation? Started list below, please help
- Biased version can give difference in constant phase offset between two signals, useful to rotate one set of symbols back into place.
- Biased version can give The difference in power between the two which is useful if I want to get them to the same amplitude.
**What can I get from Auto-correlation? Started list below, please help **
- I think that the magnitude or absolute of unbiased and unnormalised with no frequency offset or error can give me the bandwidth or Symbol rate of the signal on the Y axis where there is the maximum spike.
- The frequency offset can be obtained from the imaginary part of the autocorrelation, how this is implemented to correct the offset in carrier recovery is still alluding me.