Frequency-offset estimator for multi-carrier reception

摘要

A frequency-offset estimator comprises a plurality of correlators for obtaining correlation values between scattered pilots of a received OFDM symbol, in the frequency domain, and a plurality of classes of scattered pilots. A first selector determines the class of scattered pilots that provides the largest of the correlation values. A second selector estimates the frequency offset, based on the largest correlation value and the class of the scattered pilot determined by the first selector. In this manner, the frequency offset is estimated using one OFDM symbol and is resistant to symbol timing offsets and fractional frequency offsets.