Patent ID: 7995689

Claim:
A signal receiving apparatus of a base station in a smart antenna system which uses an Orthogonal Frequency Division Multiplexing (OFDM) communication scheme, the signal receiving apparatus comprising: a plurality of Fast Fourier Transform (FFT) units for performing FFT according to an FFT window on a plurality of incoming signals received through a plurality of antennas; an FFT window detector coupled to receive the plurality of incoming signals and a predetermined FFT window offset for detecting a boundary of an OFDM symbol and setting the FFT window with a margin as large as the predetermined FFT window offset with reference to the detected symbol boundary; a calibration signal generator for outputting an FFT window calibration signal based on the FFT window offset; and a plurality of first multipliers coupled to the plurality of FFT units and the calibration signal generator for multiplying each of the incoming signals output from the FFT units by the FFT window calibration signal.