Patent ID: 7076015

Claim:
A method of detecting one of a set of preamble sequences in a spread signal comprising the steps of: (a) correlating a received spread signal with sequences of a first orthogonal Gold code (OGC) set in accordance with a first fast transform to provide a preamble signal; (b) correlating the preamble signal with the set of preamble sequences in accordance with a second fast transform to generate a set of index values, wherein each index value of the set of index values corresponds to a one preamble sequence of the set of preamble sequences; (c) forming a decision statistic based on the set of index values; and (d) selecting, as the detected one of the set of preamble sequences, a preamble sequence corresponding to the decision statistic; wherein step (c) comprises the steps of: 1) forming an initial decision statistic based on the a relative maximum index of the set of index values; 2) selecting a signal generated by the preamble signal combined with the preamble sequence corresponding to the relative maximum index of the initial decision statistic; 3) adjusting, in one or more of amplitude and phase, the selected signal in step 2); and 4) forming the decision statistic based on the adjusted selected signal.