Orthogonal Code Division Multiple Access Communications System.
DEPARTMENT OF THE ARMY WASHINGTON DC
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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.
- Non-Radio Communications