H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/28
H04B 7/26 (2006.01) H03G 3/20 (2006.01) H04L 7/10 (2006.01) H04L 27/227 (2006.01) H04L 7/04 (2006.01) H04L 27/18 (2006.01)
Patent
CA 1232949
ABSTRACT The present invention relates to a system for radio broadcasting of binary data packets that can be received in mobile receivers. The starts of packets of data to be transmitted are transmitted periodically, the prefix of each packet starting by two bit synchronizing bytes and one byte synchronizing byte, the second bit synchronizing byte and the byte synchronizing byte constituting a periodic start of packet synchronization pattern. Synchronization processing comprises a seeking phase and a tracking phase, the transitions from the seeking phase to the tracking phase being effected when, in the seeking phase, the synchronization pattern has been found two consecutive times with a null Hamming distance. The seeking phase is comprised of at least two states, the transitions from the first Ao the second being effected when a synchronization pattern has been found with a null Hamming distance, the transition from the second to the first being effected when the consecutive pattern is not found with a null Hamming distance. The tracking phase also is comprised of at least two states, the first being the state taken after transition from the seeking phase to the tracking phase, the transition from the first to the second being effected when the pattern is found with a Hamming distance greater than 1, the transition from the second to the first being effected when the consecutive pattern is found to have a Hamming distance either null or equal to 1. The transition from the tracking phase to the seeking phase is effected when, in the second phase of the tracking phase, the next pattern is found to have a Hamming distance larger than 1.
474346
Collec Jean P.
Rigal Michel R.
Etablissement Public de Diffusion Dit "telediffusion de France"
Shapiro Cohen
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