Low error rate digital demodulator

Details Low error rate digital demodulator Low error rate digital demodulator

1985-11-19

1987-03-24

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329105, 375 92, 375113, 375117, 328136, H04L 2706

Patent

active

046530738

ABSTRACT:
An on-off keyed carrier signal is demodulated by quadrature sampling of the incoming carrier signal at twice carrier frequency to provide short term digital patterns indicating detection of an incoming signal of carrier frequency. A number of phase counting channels are provided which count the number of times a particular pattern is detected during a longer interval, preferably a sixth of a bit interval at the baud rate of the received message. Since the phase counters are reset every sixth of a bit they can collectively accommodate a substantial drift in phase of the received carrier during reception of a complete 33 bit message while still operating asynchronously with respect to the received carrier.

REFERENCES:
patent: 3908084 (1975-09-01), Wiley
patent: 4370618 (1983-01-01), Walker
patent: 4370748 (1983-01-01), Jane et al.
patent: 4555702 (1985-11-01), Matsuura et al.

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