Patent ID: 8422593

Claim:
A parallel automatic frequency offset estimation apparatus comprising: a receiving unit to receive a data frame; and a frequency offset estimation unit to calculate, in parallel, frequency and phase deviations at different bit intervals within a particular section of the received data frame, to add together the frequency and phase deviations to obtain a first sum of the frequency and phase deviations, and to add the first sum to a frequency phase deviation calculated for each bit after the particular section in the received data frame to output a second sum of the frequency and phase deviations, wherein the frequency offset estimation unit comprises: a path switching unit to separate one or more bits of the particular section from the data frame; a first frequency offset estimation unit to calculate, in parallel, frequency and phase deviations at different bit intervals with respect to the bits of the particular section passed on from the path switching unit, and add up the calculated frequency and phase deviations to obtain the first sum of the frequency and phase deviations; a second frequency offset estimation unit to calculate a frequency phase deviation for each bit after the particular section has been passed on from the path switching unit; and an addition unit to add up the first sum of the frequency and phase deviations obtained by the first frequency offset estimation unit and the frequency phase deviation calculated by the second frequency offset estimation unit to obtain the second sum of the frequency and phase deviations.