FREQUENCY AND TIME SYNCHRONISATION OF AN OFDM RECEIVER BY MEANS OF MAXIMUM LIKELIHOOD DECODING

摘要

The invention relates to a method for the frequency and time synchronisation of a receiver for receiving OFDM signals. A quality criterion of the OFDM signal is determined during one of the frequency intervals (hops) for each point of one of the two-dimensional frequency and time search areas. The area point having the optimum quality criterion (τx,fx) of the OFDM signal is then determined on the basis of said quality criterion, and the receiver is synchronised on the nominal frequency in view of the difference between the nominal frequency (fo) and the frequency value (fx) corresponding to the optimum quality criterion. The OFDM signal is demodulated and decoded starting with the time value (τx) corresponding to the optimum quality criterion.