Process and device for modulating a carrier with amplitude...

Details Process and device for modulating a carrier with amplitude... Process and device for modulating a carrier with amplitude...

2007-10-23

2007-10-23

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S375000, C375S297000, C455S192200, C455S110000, C330S002000, C330S129000, C332S103000

Reexamination Certificate

active

10655442

ABSTRACT:
The invention relates to processes and devices which make it possible to directly modulate an RF carrier with a quadrature signal. It consists in filtering (504) this quadrature signal around zero so as to introduce alternately (507, 508) on each of the channels a low-frequency subcarrier that will serve as reference. Each of these channels is alternately demodulated in a synchronous manner (519) cosine-wise and sine-wise. The demodulation signal is filtered (523) so as to recover the subcarrier marred by modulation errors. The measurement of these errors (524) allows feedback correction (503) of the quadrature signal. It makes it possible to perform the major part of the operations in the digital processor (501) and enables direct vector modulation to be made possible at millimeter frequencies.

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French Search Report of Apr. 17, 2003.

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