Accession Number : ADD009734
Title : Orthogonal Code Division Multiple Access Communications System.
Descriptive Note : Patent Application,
Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC
Personal Author(s) : Gutleber,Frank S
Report Date : 12 Aug 1982
Pagination or Media Count : 26
Abstract : This invention relates generally to noise code communications systems and more particularly to an orthogonal code division multiple-access (CDMA) communications system which utilizes noise code mate pairs. An orthogonal code division multiple-access communications system is comprised of a plurality of transceivers respectively employing orthogonal noise code mate pairs of a type having autocorrelation functions upon detection which when linearly added together compress into a lobeless impulse and wherein the same single time slot is utilized by all of the users in the system. Each user is assigned a different unique noise code pair consisting of code mate pairs that are selected from a subset of multiplexed noise codes whose cross-correlation function value is equal to zero at a time when all the code mate pairs compress to an impulse. The described arrangement enables random access, or direct call-up, to be accomplished with no interference between the users while using different noise codes for each user.
Descriptors : *Patent applications, *Communication equipment, *Multiple access, *Coding, *Transmitter receivers, Orthogonality, Noise, Time division multiplexing, Matched filters, Autocorrelation, Signal generation, Communication and radio systems, Cross correlation, Value
Subject Categories : Non-radio Communications
Distribution Statement : APPROVED FOR PUBLIC RELEASE