H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 7/10 (2006.01) H04B 1/707 (2006.01) H04L 7/08 (2006.01)
Patent
CA 2088977
2088977 9202997 PCTABS00010 A surface-acoustic-wave correlator (18) 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 (19) outputs the first bit and the second bit, respectively.
O'clock George Daniel Jr.
Vanderpool Jeffrey Scott
Omnipoint Corporation
Smart & Biggar
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