Bi-orthogonal PCM communications system employing multiplexed no

Pulse or digital communications – Repeaters – Testing

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375 96, 340348, 340350, 370 18, 370 21, H03K 1301, H04J 104

Patent

active

042939534

ABSTRACT:
A bi-orthogonal PCM communications system employing multiplexed noise codes o provide enhanced protection against interference. Two system approaches are described--a first of which employs active, matched filter detection, whereas a second of which employs passive matched filter detection. The noise codes employed are of a type termed code mates having correlation functions which, upon detection, provide an impulse autocorrelation function. The described arrangements afford a transmission efficiency which extends towards Shannon's theorectical limit.

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patent: 3483549 (1969-12-01), Gutleber
patent: 3484554 (1969-12-01), Gutleber
patent: 3510595 (1970-05-01), Gutleber
patent: 3519746 (1970-07-01), Gutleber
patent: 3634765 (1972-01-01), Gutleber
patent: 3947674 (1976-03-01), Gutleber
patent: 4019149 (1977-04-01), Kustka
patent: 4032885 (1977-06-01), Roth

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