Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1985-08-19
1987-06-23
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
307269, 328 72, H04L 700
Patent
active
046758860
ABSTRACT:
Frame synchronization devices utilize a frame alignment word decoder connected to the outputs of a shift register which receives on its input the received data bit stream. It is clocked by a clock signal generated from a selection of periods of the data bit stream timing signal reproducing a periodic pattern. This pattern is formed by relative bit locations within the duration of a frame certain at least of which are distributed according to the distribution of the bits of an alignment word in a frame and which form groups of the same size regularly distributed over the duration of a frame. This clock signal is generated in the device by a divider which divides by 20 or by 21 which imposes on it a periodic phase skip by the value of one period of the data bit stream timing for as long as the alignment word is not recognized by the decoder. The shift register is implemented in two parallel parts clocked by versions of the clock signal with a relative phase shift between them, one of which parts updates the other part in parallel on each phase skip of the clock signal.
REFERENCES:
patent: 3575554 (1971-04-01), Schmidt
patent: 3576947 (1971-05-01), Kruger
patent: 3760355 (1973-09-01), Bruckert
patent: 3766316 (1973-10-01), Hoffman et al.
patent: 3909724 (1975-09-01), Spoth et al.
patent: 4214124 (1980-07-01), Jarus
patent: 4242755 (1980-12-01), Gauzan
patent: 4395773 (1983-07-01), Philippides et al.
patent: 4468770 (1984-08-01), Metcalf et al.
Chin Stephen
Compagnie Industrielle des Telecommunications Cit-Alcatel
Griffin Robert L.
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