Patent ID: 8254508

Claim:
A method of obtaining a frequency error estimate of the difference between a reference frequency and the frequency of a space time transmit diversity signal from first and second received sequences of symbols, the method comprising the steps of: receiving the first and second sequences of symbols at a wireless receiver; wherein the first and second sequences of symbols are transmitted respectively by first and second antennae, where each sequence has two sets of first and second intervals, such that the contents of the second interval of the second received sequence are the additive inverse of the contents of the first interval of the second received sequence; calculating two sets of first and second partial sums as the sum of the contents of the first and second intervals, respectively, for each set; calculating total sum functions for the first and second sets by summing the first and second partial sums for each set; calculating an auto-correlation function based on the total sum functions for the first and second sets; and extracting the frequency error estimate from the auto-correlation function; wherein the received symbols are represented by complex numbers; and wherein the step of extracting includes isolating an imaginary part of the auto-correlation function as the frequency error estimate.