Patent ID: 6363084
Filing Date: 2002-03-26
Classification: H04L

Abstract:
A method for estimating a coarse frequency offset from an OFDM signal in which a reference signal is inserted at L number of carrier positions within each symbol and information data are inserted at the remaining carrier positions in an OFDM receiver, comprising the steps of:a) performing differential decoding process for two adjacent OFDM symbols obtained by performing FFT on the OFDM signal; b) obtaining 2S+1 number of candidate offset values {&egr;âˆ’s; &egr;s}, which are present on a predetermined range {âˆ’S; S} by using L number of differential decoded values at the same position from the reference signal among differential decoded values obtained from said step a); and c) estimating a coarse frequency offset value according to positions on which a first and a second maximum values among the 2S+1 number of candidate offset values obtained from said step b) are present.