Patent ID: 8238493

Claim:
A system comprising: a differential demodulation module configured to generate differentially demodulated signals based on having differentially demodulated received signals, and a first summing module configured to generate a combined signal by adding the differentially demodulated signals, wherein the combined signal includes a plurality of symbols; and a second summing module configured to generate a plurality of sums for each of a plurality of derived preamble sequences, wherein the derived preamble sequences are derived from preamble sequences, wherein each of the derived preamble sequences includes a plurality of derived symbols, and wherein one of the plurality of sums generated for one of the derived preamble sequences is a sum of (i) a first portion of one of the plurality of symbols of the combined signal and (ii) a second portion of one of the derived symbols of the one of the derived preamble sequences, and generate cross-correlation values for the derived preamble sequences based on the plurality of sums, wherein one of the cross-correlation values generated for one of the derived preamble sequences is a sum of the plurality of sums generated for the one of the derived preamble sequences.