Patent ID: 8295339

Claim:
An inter-carrier interference (ICI) mitigating equalizer comprising: a channel estimator estimating a channel response based on a received signal; a channel calculator calculating a basic component and fluctuating components of a channel response based on the estimated channel response; an ICI estimator multiplying the fluctuating components of the channel response by the received signal in a frequency domain, filtering the multiplication results according to predetermined filter coefficients, and estimating an ICI component included in the received signal based on the filtering results; a subtracter subtracting the ICI component from the received signal in the frequency domain; and an equalizer equalizing an output signal of the subtracter based on the basic component of the channel response, wherein the channel calculator comprises: a first delayer delaying the estimated value of the channel response that is output from the channel estimator by one symbol interval and outputting the delayed estimated value; a second delayer delaying an output signal of the first delayer by one symbol interval and outputting the delayed output signal; a subtraction unit subtracting the estimated value of the channel response in the previous symbol interval that is output from the second delayer from the estimated value of the channel response in the next symbol interval that is output from the channel estimator; and a divider dividing the subtraction result that is output from the subtraction unit by the estimated value of the channel response in the present symbol interval which is output from the first delayer and outputting the division result to the first multiplier as the first order fluctuating component of the channel response.