| 摘要 |
A frequency error estimating apparatus for estimating a frequency error between a local oscillation frequency and a carrier frequency of a received signal in a receiver includes a frequency error estimating unit (11) that suppresses a noise component included in the received signal according to a filter coefficient input to an averaging filter (23), and estimates a frequency error based on an output of the filter; and a filter coefficient determining unit (12) that calculates a filter coefficient based on a differential of estimate values of the frequency error from a first symbol, and changes the characteristics of the filter . In the receiver, the frequency error estimating apparatus can secure high precision in estimating a frequency error without losing the level of following the time variation in the Doppler frequency. <IMAGE>
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