Accession Number : ADD007615

Title :   Bi-Orthogonal PCM Communications System Employing Multiplexed Noise Codes.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Gutleber,Frank S

Report Date : 28 Dec 1979

Pagination or Media Count : 22

Abstract : This invention relates to a bi-orthogonal PCM communications system employing multiplexed 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 type termed code mates having correction functions which, upon detection, provide an impulse autocorrelation function. The described arrangements afford a transmission efficiently which extends towards Shannon's theoretical limit.

Descriptors :   *Patent applications, *Communication and radio systems, *Pulse code modulation, Digital systems, Orthogonality, Coding, Noise, Autocorrelation, Demodulation, Matched filters, Radio antijamming, Time division multiplexing

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE