Method of and apparatus for modulation of FSK carrier in a very

Details Method of and apparatus for modulation of FSK carrier in a very Method of and apparatus for modulation of FSK carrier in a very

1997-08-08

1998-12-22

Chan, Jason

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375303, 375295, 332100, 455113, H04B 144

Patent

active

058526366

ABSTRACT:
A method and a transmitter system is provided for modulating binary information on a frequency shift keying carrier in a very narrow band. Phase reversal keying is initially used to create a carrier. The transmitter of the present invention generates a carrier signal by modulating a reference signal and a control signal having two frequencies representing the binary data to be transmitted. The resulting phase reversal carrier signal is processed by high order filtering such that the output of the transmitter provides a frequency shift keyed carrier at very close frequencies. The resulting carrier signal may, at the receiver, be processed by very narrow band filtering so as to create a communication system which will use only a small part of the available spectrum.

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