Patent ID: 9231810
Filing Date: 2016-01-05
CPC Classification: H04L

Claim Text:
1. A carrier frequency offset (CFO) calibration method for calibrating a CFO of a receiver, the CFO calibration method comprising: receiving at least one CFO estimation value generated by a digital CFO estimation; calculating a mean CFO estimation value according to a plurality of CFO estimation values generated by the digital CFO estimation during a specific time interval; determining whether the mean CFO estimation value is over a threshold value; when the mean CFO estimation value is over the threshold value, generating a CFO adjustment value according to the mean CFO estimation value; and adjusting an oscillation frequency of an oscillator of the receiver according to the CFO adjustment value; wherein the step of determining whether the mean CFO estimation value is over the threshold value further comprises: after the mean CFO estimation value is over the threshold value, constantly updating the CFO adjustment value according to a mean CFO estimation value generated during a subsequent specific time interval, until the mean CFO estimation value generated during the subsequent specific time interval is lower than another threshold value.