ESTIMATION OF THE FREQUENCY ERROR OF A TONE SIGNAL WITH WIDENED ACQUISITION RANGE

摘要

Estimating an unknown frequency error of a tone signal comprises sampling (1704), within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples, and repeatedly (1720), for different frequency offsets: 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 (1708); estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values (1712); and measuring a signal - to - noise ratio of the tone signal using the signal samples and the estimated tone frequency error (1716). When a particular frequency offset results in a particular estimated tone frequency error and a measured signal - to - noise ratio that is above a threshold, that particular estimated tone frequency error is determined to be equal to the unknown frequency error of the tone signal (1724).