Patent ID: 7626923

Claim:
An apparatus for performing a variable point Inverse Fast Fourier Transform (IFFT), comprising: an IFFT interpolator to receive input data having N 1 points and output interpolated data signals having N 2 points, the IFFT interpolator including a plurality of interpolators, one of which is activated to output the interpolated data signals having N 2 points based on the input data having N 1 points, the one interpolator activated being selected according to a first IFFT operation mode signal, wherein N 1 is a number that is no greater than N 2 ; an IFFT operator to generate IFFT operation data signals having N 2 points by performing an IFFT operation on the interpolated data signals having N 2 points; an IFFT mode selector to receive the IFFT operation data signals having N 2 points and output IFFT data signals having N 1 points, the IFFT mode selector including a plurality of decimators, one of which is activated to output the IFFT data signals having N 1 points, the one decimator activated being selected according to a second IFFT operation mode signal that corresponds to the first IFFT operation mode signal provided to the IFFT interpolator; and a control unit to output the first IFFT operation mode signal and the second IFFT operation mode signal.