To cancel a frequency offset by quickly and accurately tracking up to a payload section.
The frequency level of a baseband signal is sampled at 0.5 symbol intervals to obtain a series of sample levels. On the basis of any first frequency level among the sample levels, a difference in absolute value between each of frequency levels adjoining each other every 1 symbol interval is calculated in plurality as a first differential absolute value. On the basis of a second frequency level 0.5 symbols after the first frequency level among the sample levels, a difference in absolute value between each of frequency levels adjoining each other every 1 symbol interval is calculated in plurality as a second differential absolute value. An average value of the sample levels used in calculating the first and the second differential absolute values is calculated, and if the first differential absolute value is larger than a preset first determination value and the second differential absolute value is smaller than a preset second determination value, the average value is set as a frequency offset.
| JP2006325127A | 2006-11-30 | |||
| JPH11298541A | 1999-10-29 | |||
| JP2011055298A | 2011-03-17 | |||
| JP2009071811A | 2009-04-02 | |||
| JP2003069658A | 2003-03-07 |
Shigeyuki Nagaoka
Shinji Takano