Bi-Orthogonal PCM Communications System Employing Multiplexed Noise Codes.
DEPARTMENT OF THE ARMY WASHINGTON DC
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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 Shannons theoretical limit.
- Radio Communications