Patent ID: 7804905
Filing Date: 2010-09-28
Classification: H04L

Abstract:
1. A Fast Fourier Transform (FFT) processor for demodulating an orthogonal frequency division multiplexing (OFDM) signal including a preamble having a sequence of N samples and first data following the preamble and having a sequence of N/2 samples, the FFT processor comprising: a timing acquisition section that is configured to output a timing signal in response to detecting an end point of the preamble; a controller that is configured to output a first control signal and a second control signal in response to the timing signal; a signal converter that is configured to store the preamble in response to the first control signal, to transform the preamble by an N-point FFT into a second preamble, and to store the second preamble; an FFT input buffer that is configured to store the N/2 samples of the first data while the preamble is being transformed, wherein the signal converter is further configured to perform an N-point FFT on the buffered first data and second data having a sequence of N/2 samples as the second data is sequentially received, to transform the first data and the second data into third data having N samples; and a frequency domain equalizer that is configured to synchronize the second preamble and the third data in response to the second control signal with a clock frequency of the fast Fourier transform processor, and to output the synchronized second preamble and the third data.