Orthogonal code division multiple access communications system

Details Orthogonal code division multiple access communications system Orthogonal code division multiple access communications system

H - Electricity

04

J

325/41

H04J 1/04 (2006.01) H04J 13/00 (2006.01)

Patent

CA 1193672

ABSTRACT An orthogonal code division multiple-access communi- cations system comprised of a plurality of transceivers respec- tively 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 crosscorrelation function value is equal to zero at a time when all the code mate pairs compress to an impulse, i.e. .gamma. = 0. The described arrange- ment enables random access, or direct call-up, to be accomplished with no interference between the users while using different noise codes for each user.

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