Patent ID: 7346116

Claim:
A method of detecting the presence of a signal, comprising: receiving a signal; autocorrelating the signal with a time-delayed copy of itself at a first time to form a first autocorrelation result; autocorrelating the signal with a time-delayed copy of itself at a second time to form a second autocorrelation result; crosscorrelating the signal with a Barker signal type at the first time to form a first crosscorrelation result; crosscorrelating the signal with an OFDM signal type at the second time to form a second crosscorrelation result; and declaring the signal detected if the summation of (1) the maximum of the first autocorrelation result and the second autocorrelation result and (2) the maximum of the first crosscorrelation result and the second crosscorrelation result exceed a specified value.