Continuously variable phase frequency shift keying

Details Continuously variable phase frequency shift keying Continuously variable phase frequency shift keying

2007-04-12

2011-11-01

Payne, David C. (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

Reexamination Certificate

active

08050359

ABSTRACT:
Method for modulating an RF signal includes the steps of modulating an RF signal using frequency shift keying (FSK) modulation to define a plurality of symbols (2030, 2031). The FSK modulation includes transitioning the modulated signal (204) between at least two different frequencies (f1and f0) during a guard period (210). The method includes the further step of varying a frequency of the modulated signal204during the guard period (210) in accordance with a predetermined rate of change. The predetermined rate of change is selected to minimize a bandwidth of the RF signal.

REFERENCES:
patent: 3890581 (1975-06-01), Stuart et al.
patent: 3938045 (1976-02-01), Mathwich
patent: 3997855 (1976-12-01), Nash
patent: 5857003 (1999-01-01), Geiger et al.

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