Local oscillator phase noise cancelling modulation technique

Details Local oscillator phase noise cancelling modulation technique Local oscillator phase noise cancelling modulation technique

1994-02-02

1995-08-29

Grimm, Siegfried H.

Modulators

Frequency shift keying modulator or minimum shift keying...

329302, 329313, 329316, 329325, 329327, 332112, 332119, 375272, 375278, 375306, 375307, 375327, 375334, 455102, 455110, 455260, H04L 2712, H04L 27152

Patent

active

054464218

ABSTRACT:
A data transmission system includes a source of a data signal and a modulator, responsive to the data signal, producing a first modulated signal representing the data signal and a second modulated signal representing a signal 180 out-of-phase with the data signal. The first and second modulated signals are transported via a transmission channel. A first demodulator demodulates the transported first modulated signal and a second demodulator demodulates the transported second modulated signal. A subtractor, responsive to the first and second demodulators, produces a signal representative of the data signal.

REFERENCES:
patent: 2957953 (1960-10-01), Woodward
patent: 3084329 (1963-04-01), Clay
patent: 3873931 (1975-03-01), Basse et al.

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