H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/29
H04J 13/00 (2006.01) H04B 1/707 (2006.01)
Patent
CA 1232380
CORRELATION DETECTORS FOR USE IN DIRECT SEQUENCE SPREAD SPECTRUM SIGNAL RECEIVER 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 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-random code and has a code sequence shift corresponding to that of the predetermined transmitter, and a second bipolar pseudo-random code that is a replica of the common 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 spread 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. Analog and digital implementations of the correlation detectors are disclosed.
477227
Horwitz Lawrence B.
Rouse Donald W.
Schlumberger Electricity Inc.
Smart & Biggar
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