Correlation data communications system

Pulse or digital communications – Repeaters – Testing

Patent

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340347DD, 178 2214, 375 96, H04K 104

Patent

active

044779127

ABSTRACT:
A digital data communications system employing correlation detection is disclosed as comprising an encoding system which encodes successive k-bit data words from a data source into predetermined start-stop phases of either a 2.sup.k -bit repeating pseudorandom binary code or a 2.sup.k -1 bit repeating pseudorandom binary code and a decoding system which receives the stream of ones and zeros in the pseudorandom binary code from the encoder and reproduces therefrom, using a correlation detector and associated circuitry, a replica of the original k-bit data word from the data source. Undesirable signal variations in the output of the correlation detector caused by a frequency translation error introduced in the transmission and reception of the pseudorandom binary code is eliminated by a feedback system which detects the effects of the frequency translation error at the output of the correlation detector and applies a frequency correction signal component to the pseudorandom binary code which offsets the frequency translation error prior to introduction of the pseudorandom binary code to the correlation detector.

REFERENCES:
patent: 2894684 (1959-07-01), Nettleton
patent: 4052565 (1977-10-01), Baxter
patent: 4231113 (1980-10-01), Blasbalg

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