Method for estimating a carrier leak, an estimator and modulation system provided with automatic control of a carrier using said system

A method of estimating a carrier leak, comprising the steps of:

• varying a complex gain Z applied to the received signal s between at least two values Z1 and Z2;
• measuring the position of the central carrier of the signal demodulated for each applied gain;
• calculating a part of the carrier leak based on the measured positions and the applied gains, the calculated carrier leak part corresponding to the leak due to the modulator.

A modulation system with automatic control of the carrier including a modulator receiving the signal to be modulated m and supplying the modulated signal s to be transmitted, including:

• an estimator as claimed in claim 10 receiving the modulated signal,
• a demodulator receiving the signal originating from the gain variation means and supplying to the measurement and calculation means the demodulated signal,
• carrier automatic control means for adding to the signal to be modulated m the carrier leak due to the modulator supplied by the measurement and calculation means M2.