Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1982-01-15
1984-07-10
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
328 72, 328133, 375118, H04L 704
Patent
active
044597010
ABSTRACT:
A process is provided for synchronizing at reception digital signals transmitted in packages which consists in generating the signals of a first window of given width at intervals corresponding to the timing of the on-line packages, in searching by detection for at least one transition in the signals received during the duration of each window, in modifying the interval between the beginning of a window signal and the beginning of the following signal in the case where the transitions detected do not correspond to a given criterion and in maintaining said interval equal to said on-line package timing and producing a synchronization signal fed to a package reading device in the opposite case. The device of the invention comprises a dividing counter which is reset by the transitions detected in the window so that the interval between the successive windows is modified until the synchronization is acquired, that is to say that the end of the window is located at the level of the synchronization transition T.sub.s at the beginning of a package.
REFERENCES:
patent: 3142802 (1964-07-01), Maure
patent: 3819853 (1974-06-01), Stein
patent: 3961311 (1976-06-01), Pavoni et al.
patent: 4131856 (1978-12-01), Chapman
patent: 4166979 (1979-09-01), Waggener
patent: 4208724 (1980-06-01), Ruttlingourd
patent: 4302831 (1981-11-01), Zemanek
Elektronic, vol. 27, No. 2, 1978, W. Beifuss, "Digitale Phasensynchronisiereinheit Fur Synchrone Datenubertragung", pp. 52-56.
1978 International Zurich Seminar on Digital Communications, Mar. 1978, T. Svensson: "Methods for Two-Wire Duplex Digital Transmission at 80 KBit/s on Subscriber Lines", pp. c5.1-c5.4.
Auzet Christian
Lamiral Jean P.
Lignes Telegraphiques et Telephoniques
Safourek Benedict V.
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