A process for the frequency synchronization, as well as a mobile radio telephone for use in a tdma - type cellular communication system

摘要

the present invention synchronisationsverfahren that filters the signal received with an adaptive bandpau00dffilter (101), while the signal received from a memory (108) is buffered. the energy of the input signal and the filtered signal is estimated (103 and 104) and the gain of the filter is based on the difference between the energies, adjusted (105).the pole of the filter is adjusted (102) to the frequency of the input signal in the filterdurchlau00dfband centered. if a tone is detected (106), the length of the tones is identified (107) to determine whether there is a frequenzkorrektur burst frequency correction burst; fcb).if the detektierte sound fcb is the signal in the memory is also the fcb, then, in the bandpau00dffilter (101) filter, and the difference between the frequency of this signal and 67.5 khz determined (109).this difference represents the frequenzoffset between the base station and the mobile carrier of the local oszillatoreinrichtung remain and can be used to the frequenzoffset to compensate. the boundaries of the fcb the zeitschlitzu00fcbereinstimmung the tdma structure as the base station is received, a.