Reciprocal mode saw correlator method and apparatus

Details Reciprocal mode saw correlator method and apparatus Reciprocal mode saw correlator method and apparatus

1994-10-11

1995-09-26

Barron, Jr., Gilberto

Pulse or digital communications

Repeaters

Testing

375343, 36472806, H04L 2706, G06F 15336

Patent

active

054540054

ABSTRACT:
A surface-acoustic-wave correlator for decoding a spread-spectrum signal having a data signal modulated with a plurality of chip sequences and reciprocal-chip sequences. A tapped-delay-line has a plurality of taps defining a tapped-delay-line structure matched to the chip sequence. In response to a plurality of first chips and second chips embedded in the spread-spectrum signal, the tapped-delay line generates TDL-chip sequences and inverse-TDL-chip sequences. A first transducer is acoustically coupled to the tapped-delay-line. In response to the spread-spectrum signal modulated by the chip sequence, the first transducer correlates a first group of the plurality of TDL-chip sequences and inverse-TDL-chip sequences and outputs a first correlation pulse. A second transducer is acoustically coupled to the tapped-delay-line. In response to the spread-spectrum signal modulated by the reciprocal-chip sequence, the second transducer correlates a second group of the plurality of TDL-chip sequences and inverse-TDL-chip sequences and outputs a second correlation pulse. In response to the first correlation pulse and the second correlation pulse, a decision circuit outputs the first bit and the second bit, respectively.

REFERENCES:
patent: 5355389 (1994-10-01), O'Clock et al.

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