Piecewise coherent, combined frequency and phase-shift-keyed sig

Details Piecewise coherent, combined frequency and phase-shift-keyed sig Piecewise coherent, combined frequency and phase-shift-keyed sig

1979-05-21

1981-01-27

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

364484, 375 82, 375 91, 370 12, H03K 910

Patent

active

042479436

ABSTRACT:
A system for demodulating piecewise coherent, combined frequency and phase-shift-keyed signals that are modulateed by orthogonal or biorthogonal code words. Rather than maintain local reference signals in phase-lock with the received signal, the system mixes the received signal with both sine and cosine signals at both the mark and the space frequencies to obtain multiple outputs which are correlated with each of the code words utilized by the system to determine the particular code words that have been received.

REFERENCES:
patent: B498775 (1976-03-01), Balcewicz
patent: 3800227 (1974-03-01), Kobayashi et al.
patent: 3855533 (1974-12-01), Schueli
patent: 3875394 (1975-04-01), Shapely
patent: 4174489 (1979-11-01), Guidoax et al.
patent: 4178631 (1979-12-01), Nelson, Jr.

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