Orthogonal CDMA system utilizing direct sequence pseudo noise co

Details Orthogonal CDMA system utilizing direct sequence pseudo noise co Orthogonal CDMA system utilizing direct sequence pseudo noise co

1982-11-04

1984-07-17

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

340346, H04J 1300

Patent

active

044609922

ABSTRACT:
An orthogonal code division multiple access communications system is disclosed involving multiple users while providing orthogonal operation, meaning that there is substantially zero interference between users. All of the users employ a mutually different time permutation of the same multi-bit direct sequence pseudo noise code with a synchronous time reference for all of the users being established through a central node or station which communicates with all of the users preferably through a loopback synchronous timing scheme. Each pseudo noise code is followed by an extra processing bit that balances the number of one and zero bits in the composite information bit which has the effect of providing a code structure which will have a cross-correlation value of zero with the other time permutated codes which enables the system to operate as an orthogonal system.

REFERENCES:
patent: 3908088 (1975-09-01), Gutleber
patent: 4293953 (1981-10-01), Gutleber
Weik, Martin H., Communications Standard Dictionary, Van Nostrand Reinhold ompany, 1983, pp. 56;200.

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