How to find autocorrelation function for a mm-sequence ?

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Osman Adil
Osman Adil 2013-4-11
I have generated an m-sequence with periodicity 1023 i.e., for order 10. I have successfully generated the m sequence using matlab but got struck while evaluating autocorrelation function of that sequence. I tried using 'xcorr' but it doesn't seem to match the text book i.e., when I use xcorr I get values more than 1. The problem persist even if I try to normalize it i.e., when I divide it by 1023.
If anyone can help me out how to evaluate the autocorrelation function it will be helpful to me. Also, I am wondering if I could evaluate the autocorrelation for specified time value. For example I know matlab calculates the autocorrealtion for discrete values 1,2,3 ... I was wondering if I could calculate it for 0.2,0.4.
Thanks guys in advance.

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Greg Heath
Greg Heath 2013-4-11
I do not have xcorr. However, I believe there are at least four options with names like 'unbiased', 'biased' , 'coeff' and 'none' see
help xcorr doc xcorr
for details. Also check to see if you have crosscorr
help crosscorr doc crosscorr
Finally, you can use
crosscorrelation(a,b) = ifft(conj(fft(a)).*fft(b))/N;
Unfortunately, nncorr in the Neural Network Toolbox is buggy.
Hope this helps.
Thank you for formally accepting my answer
Greg

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