Orthogonal code division multiple access communications systems

Details Orthogonal code division multiple access communications systems Orthogonal code division multiple access communications systems

1982-08-12

1985-01-15

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

370 21, 375 96, 340350, H03K 1301, H04J 104

Patent

active

044942281

ABSTRACT:
An orthogonal code division multiple-access communications system 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, i.e. .tau.=0. 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.

REFERENCES:
patent: 4293953 (1981-10-01), Gutleber
patent: 4301530 (1981-11-01), Gutleber
Weik, Martin H., Communications Standard Dictionary, Van Nostrand Reinhold ompany, 1983, pp. 56, 200.

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