Communication over noisy lines

Details Communication over noisy lines Communication over noisy lines

1983-03-07

1985-05-14

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 1, 375115, H04K 104

Patent

active

045176795

ABSTRACT:
In a line network communication system coded data signals are transmitted on a base band carrier signal and are recovered in a receiver. The receiver includes an exclusive OR gate and a shift register which operate in conjunction to compare, during successive time intervals, a series of coded reference signals and a succession of received signals shifted in phase relative to one another by respective amounts to generate respective comparison signals forming a set. A control unit causes a change in the relative phases of compared signals until the value of a comparison signal in a set indicates a degree of correlation exceeding a threshold value. Then, in a tracking mode, the control unit monitors the values of comparison signals generated in successive sets to verify that a degree of correlation exceeding the threshold value persists. If the verification is successful the control unit, in a locking mode, adjusts the relative phases of the compared signals to maintain a desired degree of correlation.

REFERENCES:
patent: 3878527 (1975-04-01), Rensin et al.
patent: 3953674 (1976-04-01), Fletcher et al.
patent: 4039749 (1977-08-01), Gordy et al.
patent: 4351064 (1982-09-01), Ewanus
patent: 4435822 (1984-03-01), Spencer et al.

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