Sawc phase-detection method and apparatus

Details Sawc phase-detection method and apparatus Sawc phase-detection method and apparatus

H - Electricity

04

L

H04L 9/12 (2006.01) H04B 1/707 (2006.01) H04L 7/027 (2006.01) H04L 27/233 (2006.01)

Patent

CA 2087712

2087712 9202094 PCTABS00010 A phase-coded surface acoustic wave correlator device (17) is used with a spread spectrum receiver. A data device (13) outputs a data symbol sequence, a code generator (14) repetitively generates a spreading sequence, and a chip modulating device (11) combines the outputs of the data device (13) and of the code generator (14). The output of the chip modulating device (11) is combined with the output of a signal source (16) in a phase modulator (12). Upon receiving the signal at the surface acoustic wave correlator (17) from the communications channel (15), the signal is demodulated at the surface acoustic wave correlator (17) using appropriate transducer and tapped delay line structures phase-matched to the chip sequence of the received signal. The output of the surface acoustic wave correlator (17) is fed into a phase detector (18) which recovers the data symbol sequence for further use.

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