Bi-orthogonal PCM communications system employing multiplexed noise codes
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United States of America Patent
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Oct 6, 1981
Grant Date -
N/A
app pub date -
Dec 28, 1979
filing date -
Dec 28, 1979
priority date (Note) -
Expired
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Abstract
A bi-orthogonal PCM communications system employing multiplexed noise codeso 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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