Patent ID: 7280605
Filing Date: 2007-10-09
Classification: H04L

Abstract:
1. An orthogonal frequency division multiplexing (OFDM) receiver of a wireless Local Area Network (LAN) system, comprising: a radio frequency (RF) module, adapted to receive a radio signal, and to extract therefrom and output an OFDM analog signal; an analog-to-digital (A/D) converter, adapted to sample and convert the OFDM analog signal into an OFDM digital signal; a first differential cross-correlation unit, adapted to perform a first cross-correlation of the OFDM digital signal and an expected differential value of a short training symbol, and to output a first differential cross-correlation value; a second differential cross-correlation unit, adapted to perform a second cross-correlation of the first differential cross-correlation value and an auto correlation value of the expected differential value of the short training symbol, and to output a second differential cross-correlation value; a first peak value detection unit, adapted to compare a previous first peak value Z(d a second peak value detection unit, adapted to compare a previous second peak value Z(d a symbol clock generator, adapted to determine a location d an inverse fast Fourier transform (IFFT) unit, adapted to synchronize the OFDM digital signal to the symbol clock, to perform an IFFT for the synchronized digital signal, and to output a digital symbol.