H - Electricity – 04 – J
Patent
H - Electricity
04
J
354/141, 340/70,
H04J 13/00 (2006.01)
Patent
CA 1153800
ABSTRACT OF THE DISCLOSURE A bi-orthogonal PCM communications system employing multi- plexed noise codes to 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 impluse autocorrelation function. The described arrangements afford a transmission efficiency which extends towards Shannon's theorectical limit.
358803
Aspila Kalevi P.
The Government Of The United States As Represented By The Secret
LandOfFree
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