Patent ID: 8576743
Filing Date: 2013-11-05
Classification: H04L

Abstract:
1. A method of estimating an unknown frequency error of a tone signal, the method comprising: sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples; applying a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency, wherein applying the frequency offset to produce the offset values comprises: estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values; measuring a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error; upon determining that the measured signal-to-noise ratio does not satisfy a threshold, repeating the applying, estimating, and measuring for different frequency offsets; and upon determining that the measured signal-to-noise ratio satisfies the threshold, determining, that the unknown frequency error of the tone signal is equal to the particular estimated tone frequency error.