What is the practical importance of cross correlation?

[rabel126]

what is practical importance of cross correlation suppose if we corelate two discreate sequences {1, 2 ,3} and {2 , 0 ,5} the answer is { 5 10 17 4 6}
what does there value shows high correlation , low correlation or anyother

 

[konarkk]

Re: cross correlation

Hey importance of correlation lies in fact that how much two signal are equal.

If high correlation occurs then another signal is copy of orignal one , matter lies only in phase.

e.g for detection in radar a recevied signal is correlated to obtain the information that how badly it is contaminated with white noise.

Also Importance of correlation very much in digital communication & control system.

 

[JohnJ]

Re: cross correlation

A non-mathematician way to look at cross-correlation is the misnomer 'pattern matching'. I had to use cross-correlation to pick a pleth (heart-beat) pattern out of a raw ECG signal.

Also, arguably, an FT or FFT is cross-correlation of the input with a sine wave of a given frequency. (Also, do it with the cosine-wave of each frequency and you remove the phase sensitivity.) The complexity comes from the tricks used to speed up the process.

I struggled with FFTs for a long time before someone ( a P.H.D in DSP of all people) explained that to me.

 

[jasmin_123]

cross correlation

>Wiener-Khinchin theorem

Nowadays it is called Einstein-Wiener-Khinchin theorem.

 

[nanang_00]

Re: cross correlation

In the CDMA technology, cross-correlation between codes that used are zero, so they don't interfere each other.

 

[kesuma]

cross correlation

In the CDMA technology, cross-correlation between codes that used are zero, so they don't interfere each other.

So it's means that all the signal having no similarity..
OW, ic now
That's why they didn't interfere each other right?

Then what is the mean of cross correlation?

Thanks