Patent Document ID: 7751520
Application ID: 10666723
Patent Flag: 1

Claim One:
1. A method of detecting a packet comprising: sampling a received signal to produce a sequence of samples wherein the sequence of samples includes a plurality of subsequences of samples; cross correlating each of the plurality of subsequences of samples with a known form of a subsequence to produce at least one cross correlation for each of the plurality of subsequences of samples, wherein the known form of the subsequence is adjusted in sign according to a pseudorandom sequence; self correlating the cross correlations to produce a plurality of self correlations; summing the self correlations, including adjusting the sign of each of the plurality of self correlations according to a known sequence that corresponds to the pseudorandom sequence; and detecting a packet at least in part by processing the sum of the self correlations; wherein processing the sum of the self correlations includes comparing for a period of time the magnitude of the sum of the self correlations to a first threshold and summing the sums of the self correlation whose magnitudes exceed the first threshold and comparing the magnitude of summed sums to a second threshold.