Patent ID: 6993094
Filing Date: 2006-01-31
Classification: H04L

Abstract:
1. A method of performing a coarse frequency synchronization compensation for a carrier frequency deviation from an oscillator frequency in a demodulation system capable of demodulating a signal having a frame structure, said frame structure comprising at least one useful symbol and a reference symbol, said reference symbol being an amplitude-modulated bit sequence which comprises two identical sequences, said method comprising the steps of: receiving said signal; down-converting said received signal; performing an amplitude-demodulation of the down-converted signal in order to generate an envelope, said envelope having two portions which are based on said identical sequences; correlating one of said portions of said envelope with another one of said portions in order to determine said carrier frequency deviation; and controlling said oscillator frequency based on said carrier frequency deviation: wherein said correlating step further comprises weighting of corresponding values of said two portions with corresponding values of said two sequences.