OFDM RECEIVER APPARATUS AND AUTOMATIC FREQUENCY CONTROL METHOD

摘要

An OFDM receiver apparatus and an automatic frequency control method wherein communication quality is improved. In a mobile station apparatus (200), which is an OFDM receiver apparatus, an RF part (205) uses an oscillating signal to perform a radio processing of an OFDM signal in which a known signal sequence has been superimposed on particular subcarriers for transmission. A phase rotation amount estimating part (215) estimates a phase rotation amount in the radio-processed OFDM signal. An subcarrier-by-subcarrier frequency error control part (245) determines subcarrier-by-subcarrier frequency deviations of the OFDM signal, based on candidate subcarriers on which the known signal sequence has been superimposed and also based on a result of correlation between each of the signals superimposed on subcarriers adjacent to those candidate subcarriers in the frequency direction and a replica sequence based on the known signal sequence. A ?F/control voltage converting part (225) adjusts the frequency of the oscillating signal in accordance with the phase rotation amount and the determined subcarrier-by-subcarrier frequency deviations.