Circuit for synchronizing a pseudo-random generator mounted at a

Details Circuit for synchronizing a pseudo-random generator mounted at a Circuit for synchronizing a pseudo-random generator mounted at a

1978-09-13

1980-07-22

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 57, 375115, H04K 104, H04L 700, H04L 2710

Patent

active

042142091

ABSTRACT:
A circuit for synchronizing a pseudo-random generator at a receiver and which actuates a phasing device that cancels phase shift keying accomplished at the transmitter and uses a regulating loop with a delay device such as a delay line for correlating the received signal with the pseudo-random sequence which is produced at the receiver and conforms with a transmitter pseudo-random sequence and consists of a random alignment of the binary values L and H in a fixed pulse plan where the sequence repeats following a specific number of timing pulses and wherein the delay device which is fed with the received signal has a plurality of tappings which are of the same time spacing and which correspond to the reciprocal of the pulse train frequency of the pseudo-random sequence with a first portion of the tappings connected directly to an adding device at the receiver and the second portion of the tappings connected to the adding device through an 180.degree. phase reversal means and the output of the adding device is fed to a rectifier and wherein a phase detector receives the output of the rectifier and the output from a pseudo-random generator at the receiver and the phase detector controls a voltage controlled oscillator through a loop filter which regulates the pulse train frequency of the pseudo-random generator.

REFERENCES:
patent: 3402265 (1968-09-01), Couvillon, Jr.
patent: 3953674 (1976-04-01), Fletcher et al.
patent: 4023103 (1977-05-01), Malm
patent: 4039749 (1977-08-01), Gordy et al.
patent: 4048563 (1977-09-01), Osborne
patent: 4095047 (1978-06-01), von Pieverling
"Spread Spectrum Systems", Dixon, John Wiley & Sons, New York, 1976, pp. 12-19 & 180-213.
Siemens Forschungs- und Entwicklungs-Berichte, 4 (1975), Nr. 2, pp. 61-67.
IEEE Transactions on Communication Technology, vol. COM 12, 1964, pp. 123-127.
IEEE Transactions on Communication Technology, vol. COM-13, 1965, pp. 475-483.
Proceedings of the IEEE, vol. 64, No. 5, 1976, pp. 751-753.

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