Code division multiplexer using direct sequence spread spectrum

Details Code division multiplexer using direct sequence spread spectrum Code division multiplexer using direct sequence spread spectrum

1984-03-23

1986-07-15

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

375 21, 375115, 370 18, H04L 900

Patent

active

046010475

ABSTRACT:
A plurality of transmitters synchronized to a common clock each transmit a data signal spread by a common bipolar pseudo-random code having a different predetermined assigned code sequence shift. A receiver, synchronized to the clock, discriminates the signal transmitted by a predetermined transmitter from signals transmitted by the others by generating a first bipolar pseudo-random code that is a replica of the common bipolar pseudo-radom code and has a code sequence shift corresponding to that of the predetermined transmitter, and a second bipolar pseudo-random code and has an unassigned code sequence shift. The difference between the first and second bipolar pseudo-random code sequences, which is a trinary code sequence, is cross-correlated with the incoming signals. The cross-correlation despreads only the signal applied by the sequence having the predetermined code sequence shift. Each receiver includes a number of correlation detectors offset from each other by a fraction of a code chip together with decision circuitry to identify cross-correlation peaks for optimum synchronization.

REFERENCES:
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patent: 4048563 (1977-09-01), Osborne
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patent: 4178549 (1979-12-01), Ledenbach et al.
patent: 4241447 (1980-12-01), Epstein
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patent: 4286333 (1981-08-01), Franklin
patent: 4361891 (1982-11-01), Lobenstein et al.
patent: 4460992 (1984-07-01), Gutleber
patent: 4493080 (1985-01-01), Campbell

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