Patent ID: 7277380

Claim:
A method for frequency and time synchronization of a receiver for receiving a Orthogonal Frequency Division and Multiplexing (OFDM) signal, transmitted according to a frequency hop method in frequency intervals changing in hops, comprising: searching, during every frequency interval, a demodulated receiving signal step-by-step in a frequency search area (f 1 to f 2 ), in which a nominal frequency (f 0 ) of the OFDM signal lies, and step-by-step in a time search area (τ 1 to τ 2 ), in which a nominal start (τ 0 ) of the OFDM signal lies, whereby for each point of the two-dimensional grid arising in the frequency and time directions a quality criterion of the OFDM signal is established, and the grid point with the optimum quality criterion is determined therefrom, establishing a difference between the nominal frequency (f 0 ) and the frequency value (f x ) corresponding to the determined optimum quality criterion and correcting a center frequency error of the OFDM signal with respect to the nominal frequency (f 0 ) based on the difference, thereby synchronizing the received signal with regard to frequency, and demodulating the OFDM signal that is decoded starting with the time value (τ x ) corresponding to the determined grid point with the optimum quality criterion.