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Abstract

A fast Fourier transform (FFT) window position recovery apparatus in an orthogonal frequency division multiplexing (OFDM) receiver is provided. This apparatus, in an OFDM system receiver which receives an OFDM symbol comprised of a useful data interval and a guard interval and recovers a FFT window position, includes: an analog-to-digital converter (ADC) for converting a received OFDM signal into a digital complex sample; a symbol start detector for detecting a power difference between the digital complex samples output by the ADC and detecting a position having a minimum absolute value of the power difference between the samples, as a symbol starting position; and a FFT window controller for activating FFT by moving the FFT window position using symbol start information detected by the symbol start detector. The influence of frequency and phase offsets is reduced by using the power difference between adjacent samples delayed by the useful data interval, thus improving the reliability of a system.

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