Patent ID: 7580468

Claim:
A synchronization circuit for orthogonal frequency division multiplexing (OFDM) receivers, the synchronization circuit comprising: a fast Fourier transform (FFT) processor configured to perform an FFT of an input signal; and a synchronization unit configured to obtain a channel impulse response (CIR) using an output signal of the FFT processor and relocate an FFT window based on the CIR, wherein the synchronization unit comprises: a CIR generation unit configured to obtain the CIR using the output signal of the FFT processor; and a CIR analyzer configured to analyze the CIR and generate an FFT signal for relocating the FFT window based on an analyzing result; wherein the CIR generation unit comprises: a control unit configured to generate a selection signal and a CIR analyzing signal based on OFDM frame information of a first input signal and the FFT signal; and a signal generation unit configured to generate a second input signal and a third input signal based on the first input signal and selectively output one of the first, second and third input signals to the FFT processor responsive to the selection signal.