Receiving device and method

A receiving device comprising:

• a first Fast Fourier Transform (FFT) unit which transforms an input signal of a time domain into a signal of a frequency domain by performing FFT on the input signal and outputs the signal of the frequency domain;
• a pilot signal extracting unit which extracts a pilot signal from a plurality of frequency domains output from the first FFT unit and outputs the pilot signal;
• an Inverse Fast Fourier Transform (IFFT) unit which transforms the pilot signal into a signal of the time domain by performing IFFT on the pilot signal and outputs an IFFT signal;
• a buffer which stores the IFFT signal output from the IFFT unit;
• a subtracting unit which subtracts an IFFT signal stored in the buffer from the input signal and outputs a subtracted signal;
• and
• a second FFT unit which transforms the subtracted signal output from the subtracting unit into a signal of a frequency domain by performing the FFT on the subtracted signal output from the subtracting unit.

A receiving method performed by a receiving device, comprising:

• transforming an input signal of a time domain into a plurality of signals of a frequency domain by performing Fast Fourier Transform (FFT) on the input signal of the time domain;
• extracting a signal with a power that is greater than a threshold value from among the plurality of signals of the frequency domain;
• transforming the extracted signal into a signal of the time domain by performing Inverse Fast Fourier Transform (IFFT) on the extracted signal;
• subtracting a signal of the time domain from the input signal;
• transforming the subtracted signal into a signal of the frequency domain by performing the FFT on the subtracted signal;
• and
• outputting the signal of the frequency domain as an FFT result.

A receiving method performed by a receiving device, comprising:

• transforming an input signal of a time domain into a plurality of signals of a frequency domain by performing Fast Fourier Transform (FFT) on the input signal;
• extracting a first pilot signal from among the plurality of the signals of the frequency domain;
• transforming the extracted first pilot signal into a signal of a time domain by performing Inverse Fast Fourier Transform (IFFT) on the extracted pilot signal;
• storing the signal of the time domain in a buffer;
• subtracting the signal stored in the buffer from the input signal;
• transforming the subtracted signal into the signal of the frequency domain by performing the FFT on the subtracted signal;
• and
• outputting the signal of the frequency domain as an FFT result.