Patent ID: 8559483

Claim:
A method of determining a presence of a spread spectrum signal, comprising: receiving N input samples of a signal; performing a first autocorrelation on the N input samples with a first offset; performing a second autocorrelation on the N input samples with a second offset; performing a third autocorrelation on the N input samples with a third offset; performing a fourth autocorrelation on the N input samples with a fourth offset; performing a fifth autocorrelation on the N input samples with a fifth offset; determining if values of the first, second, and third autocorrelations are decreasing; determining if values of the fourth and fifth autocorrelations are less than a threshold value; and determining that the spread spectrum signal is present in the N input samples when both the values of the first, second, and third autocorrelations are decreasing and the values of the fourth and fifth autocorrelations are less than the threshold value.