Patent ID: 7324432

Claim:
An apparatus for compensating a frequency offset using a pilot symbol for a receiver in an OFDM/CDMA system including a transmitter for inserting a pilot symbol in a data symbol of frame unit in a specific pattern before transmission, comprising: a carrier synchronizer for compensating for a fine frequency offset using the pilot symbol inserted in the specific pattern of an IFFT-transformed data symbol stream, wherein the carrier synchronizer comprises: a pilot symbol detector for detecting a pilot symbol from an OFDM-demodulated data symbol stream; a delay for delaying the detected pilot symbol by a predetermined time; a phase difference detector for detecting a phase of the pilot symbol output from the pilot symbol detector and a phase of the delayed pilot symbol output from the delay, and calculating a phase difference between the two pilot symbols; an averager for calculating a fine frequency offset by averaging the phase differences in a frame unit and outputting a second frequency offset compensation signal according to the fine frequency offset; and a second frequency offset compensator for compensating for a fine frequency offset of the demodulated data symbol according to the second frequency offset compensation signal.