OFFSET COMPENSATING CIRCUIT AND OFFSET COMPENSATING METHOD

摘要

An offset compensating circuit comprises: a DC offset estimating/compensating means that estimates the value of a DC offset included in an OFDM signal to compensate the DC offset; a frequency offset estimating/compensating means that estimates the value of a frequency offset included in the DC-offset compensated signal to compensate the frequency offset; an excessively compensated component calculating means that uses both the DC offset value estimated by the DC offset estimating/compensating means after the compensation by the frequency offset estimating/compensating means and the frequency offset value estimated by the frequency offset estimating/compensating means to calculate a component of a subcarrier excessively compensated in the DC offset compensating means; and an excessively compensated component removing means that removes, from the DC offset value estimated by the DC offset estimating/compensating means, the excessively compensated component calculated by the excessively compensated component calculating means to use the resultant in the DC offset compensation by the DC offset estimating/compensating means. Thus, the offset compensating circuit compensates the frequency offset of the signal as DC-offset compensated after the removal of the excessively compensated component and outputs the resultant.