Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1980-02-08
1981-10-13
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
375111, 375113, H04L 704
Patent
active
042952220
ABSTRACT:
This arrangement for restituting the clock is used to sample the demodulated signals formed by demodulation of the received signal by means of the signals which are in phase with and shifted through 90.degree. relative to a local carrier. The arrangement according to the invention comprises logic circuit to detect to which phase section out of n possible phase sections of the transmitted signals the phase of the received signal belongs at the sampling instants, and calculation to form the component which is in phase or shifted through 90.degree., of a signal derived from the received signal by means of a phase shift .DELTA..theta. to make its phase equal, at the sampling instants, to the center phase of the detected phase section. The zero-passages of this component are used to control the local clock.
REFERENCES:
patent: 3491305 (1970-01-01), Stone
patent: 3646447 (1972-02-01), Van Gerwen
patent: 3806815 (1974-04-01), Fletcher
patent: 3818347 (1974-06-01), Holsinger
patent: 3962637 (1976-06-01), Motley
patent: 4004226 (1977-01-01), Qureshi
patent: 4025719 (1977-05-01), Nussbaumer
patent: 4182932 (1980-01-01), Fisher
Briody Thomas A.
Chin Stephen
Goodman Edward W.
Safourek Benedict V.
Streeter William J.
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