Patent ID: 7061997
Filing Date: 2006-06-13
Classification: H04L

Abstract:
1. A method of performing a fine frequency synchronization compensating for a carrier frequency deviation from an oscillator frequency in a multi-carrier demodulation system capable of carrying out a differential phase decoding of multi-carrier modulated signals, said signals comprising a plurality of symbols, each symbol being differentially coded in the direction of the frequency axis, said method comprising the steps of: a) determining a phase difference between phases of the same carrier in different symbols; b) determining a frequency offset by eliminating phase shift uncertainties related to the transmitted information from said phase difference making use of a M-PSK decision device; and c) performing a feedback correction of said carrier frequency deviation based on said determined frequency offset, wherein said steps a) and b) are performed for a plurality of carriers in said symbols, an averaged frequency offset is determined by averaging said determined frequency offsets of said plurality of carriers, and said feedback correction of said frequency deviation is performed based on said averaged frequency offset.