Phase randomization to reduce detectability of phase or frequenc

Details Phase randomization to reduce detectability of phase or frequenc Phase randomization to reduce detectability of phase or frequenc

1985-04-17

1987-03-24

LaRoche, Eugene R.

Cryptography

Cryptanalysis

342 60, 332 18, 380 31, H04K 100

Patent

active

046528385

ABSTRACT:
A communications system for conveying information angle-modulated onto a carrier includes a modulator which angle-modulates the data onto the carrier and which also randomly changes the phase of the carrier. Since the carrier phase is randomly changed, an unauthorized receiver or interceptor of the signal who frequency-multiplies the signal and integrates over a long period in order to reconstruct the carrier produces a carrier which has a broader bandwidth and relatively less amplitude than in the case in which the carrier phase is not randomly changed. The probability of intercept and demodulation by the unauthorized receiver is thereby reduced. The authorized receiver frequency-multiplies and integrates for the known frame interval to recover the carrier.

REFERENCES:
patent: 3617892 (1971-11-01), Hawley
patent: 4179657 (1979-12-01), Hobbs
patent: 4206462 (1980-06-01), Rabow
patent: 4324002 (1982-04-01), Spilker Jr.

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