Method and device for finding a characteristic data group period

Details Method and device for finding a characteristic data group period Method and device for finding a characteristic data group period

1994-11-08

1997-04-29

Chin, Stephen

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

375368, 370514, H04L 700

Patent

active

056256540

ABSTRACT:
A method and device for finding a characteristic data group periodically inserted into a stream of successively transmitted data. Memory (7) stores temporarily a series of receive data corresponding to the minimal subset necessarily including the group looked for. Comparator (8) searches for a reference element relative to the group looked for in the preselected area including one of the modules into which the stored subset is divided. The search is continued module by module until a data group is identified identical to the reference element. Memory (11) memorizes the position of any group identical to the reference element in the module in which any such group was identified. A confirmation search eliminates group positions which are not found again subsequently, until there remains only the position of the last group present, which is deemed to be the reference looked for.

REFERENCES:
Nomen Nescio, "Generalized Framing Algorithm for American (TI) and European (CEPT) Primary Layer 1 Frame Structures", IBM Technical Disclosure Bulletin, vol. 31, No. 7, Dec. 1, 1988, pp. 161-176.
P. Tolstrup Nielsen, "Distributed Frame Synchronisation by Nonlinear-Shift-Register Sequences", Electronics Letters, vol. 9, No. 4, Feb. 22, 1973, pp. 73-75.

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