1. A digital cellular system, comprising at least one base station for communication with subscriber equipment, and in which between a base station that includes a transmitter and a receiver and a subscriber equipment that also includes a transmitter and a receiver a radio channel can be established for the transmission of a transmission burst by at least one of said base station and said subscriber equipment, in which radio channel a training sequence having a recognizable symbol sequence is included in a transmission burst transmitted by said at least one of said base station and said subscriber equipment, said recognizable symbol sequence comprising a plurality of symbols for expressing a reference part and at least one additional part, whereby a receiver of at least one of said base station and said subscriber equipment can adapt itself to the radio channel according to an impulse response measured in the radio channel in accordance with the received training sequence, characterized in that the at least one of said reference part and said other part of said recognizable symbol sequence are not comprised, for all transmission bursts, of a constant number of said plurality of symbols.