System for improving signal-to-noise ratio in a direct...

Details System for improving signal-to-noise ratio in a direct... System for improving signal-to-noise ratio in a direct...

H - Electricity

04

J

363/29

H04J 13/00 (2006.01) H04B 1/707 (2006.01)

Patent

CA 1246254

SYSTEM FOR IMPROVING SIGNAL-TO-NOISE RATIO IN A 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 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 signal. The cross-correlation despreads only the signal 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. The output of each sub-receiver is processed to extract data using weighting factors selected according to the particular distortion present, to improve signal-to-noise ratio.

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