Patent ID: 7009932

Claim:
A frequency tracking device for a receiver of a multi-carrier communication system, for evaluating and correcting frequency deviations (f off ) which are introduced into multi-carrier symbols when being transmitted between a transmitter multi-carrier filter bank and receiver multi-carrier filter bank, comprising: a) a selector adapted to receive a set of N complex data symbols output by the receiver multi-carrier filter bank and N channel coefficients (C est ) corresponding to each sub-carrier as estimated by a channel estimator of said receiver (RC), where N is the number of used sub-carriers in the multi-carrier system, and adapted to select, on the basis of the N channel coefficients (C est ), a number M of sub-carriers corresponding to the M channel coefficients (C est ) having the largest absolute values, where M≦N; b) an evaluator adapted to determine, on the basis of the M selected sub-carriers and their corresponding M channel coefficients (C est ), an estimate (f off,est ) of the frequency deviation (f off ) introduced into the multi-carrier symbols; and c) a corrector for correcting the frequency deviation introduced into the multi-carrier symbols on the basis of the determined frequency deviation estimate (f off,est ).