Patent ID: 8654906

Claim:
A receiving device comprising: a first Fast Fourier Transform (FFT) circuit which performs FFT on an input signal of a time domain to transform the input signal into a plurality of signals of frequency domains and outputs the plurality of signals of the frequency domains; a signal extracting circuit which extracts a signal with a power that is greater than a threshold value from among the plurality of signals of the frequency domains output from the first FFT circuit and outputs the extracted signal; an Inverse Fast Fourier Transform (IFFT) circuit which performs IFFT on the extracted signal having a power that is greater than the threshold value and being output from the signal extracting circuit; a subtracting circuit which subtracts the extracted signal output from the IFFT circuit from the input signal and outputs a subtracted signal; and a second FFT circuit which transforms the subtracted signal output from the subtracting circuit into a signal of the frequency domain by performing the FFT on the subtracted signal output from the subtracting circuit.