Digital coherent phase demodulator

Details Digital coherent phase demodulator Digital coherent phase demodulator

1979-01-09

1981-01-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 83, 364484, 328133, H04L 2722

Patent

active

042466547

ABSTRACT:
A digital system for demodulating coherent phase shift keyed signals. Maximum likelihood estimates of the unmodulated phase and rate of change of the unmodulated phase of the received signal relative to a local oscillator signal are used to improve the demodulation process. The maximum likelihood estimates are obtained from measurements of the phase of the received signal relative to the local oscillator signal over a predetermined set of keying intervals. The digital demodulation process permits rapid "lock-on" at low signal-to-noise ratios.

REFERENCES:
patent: 3096482 (1963-07-01), Frank et al.
patent: 3855533 (1974-12-01), Schueli
patent: 4087752 (1978-05-01), Melvin
patent: 4138644 (1979-02-01), Godard et al.
patent: 4178631 (1979-12-01), Nelson, Jr.

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