Patent ID: 7099397

Claim:
A receiver of an orthogonal frequency division multiplexing (OFDM) system for estimating a frequency offset of an OFDM digital signal by using a training symbol for use in an OFDM modulation, wherein the training symbol includes guardtones and effective sub-carrier signals, the receiver comprising: a received signal transformer for removing from the training symbol a guardtone portion which is unnecessary for the frequency offset estimation and sub-carriers that are deviated from a mean value of the effective sub-carrier signals left after the guardtone portion is removed by over a predetermined value; a frequency offset estimator for estimating the frequency offset of the OFDM digital signal by using a signal outputted from the received signal transformer and outputting a frequency correction signal for the estimated frequency offset; and a frequency compensator for compensating the frequency offset of the OFDM digital signal by using the frequency offset correction signal provided from the frequency offset estimator.