Simplified minimum shift keying modulator

Details Simplified minimum shift keying modulator Simplified minimum shift keying modulator

1981-12-15

1985-02-19

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 16R, 332 22, 332 23R, 375 47, 375 50, 375 64, H03C 302, H04L 2712

Patent

active

045008566

ABSTRACT:
An MSK modulator having a simple construction with only a single necessary adjustment. The digital bit stream to be modulated is fed directly to the control input of a 0,.pi. phase shifter in a single-sideband modulator. A phase shift circuit is used to couple an IF signal to the IF signal input of the single-sideband modulator with the phase thereof adjusted by 0 or .pi. in response to two contiguous bits of the input data stream so as to maintain phase continuity in the output of the modulator for all possible bit combinations in the input stream.

REFERENCES:
patent: 3605017 (1971-09-01), Chertok et al.
Morihiro, Y. et al., "A 100 M bit/S Prototype MSK Modem for Satellite Communication" IEEE, Trans. Communications, v. COM-27, No. 10. pp. 1512-1518, Oct. 1979.

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