Coherent frequency exchange keying modulator

Details Coherent frequency exchange keying modulator Coherent frequency exchange keying modulator

1989-01-12

1989-11-21

Grimm, Siegfried H.

Modulators

Frequency shift keying modulator or minimum shift keying...

375 45, 375 66, H04L 2712

Patent

active

048825522

ABSTRACT:
Signal modulation apparatus for the transmission of binary data signals edying a process which results in superior side-lobe suppression compared with other forms of modulation such as frequency shift keying. The apparatus generates two carrier waves, the difference between whose frequencies is an integral multiple of the data signal bit-rate, amplitude modulates the two waves by a low-pass filtered data signal and an inverted version thereof respectively and then sums the resulting modulated waveforms to produce a frequency keyed waveform having continuous phase and almost negligible envelope ripple. The apparatus can be used with most forms of digital communication systems and may be demodulated by a conventional receiver such as ratio detector or phase-locked loop.

REFERENCES:
patent: 3223925 (1965-12-01), Florac, Jr. et al.
patent: 4516087 (1985-05-01), Bruene

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