Patent ID: 7925228

Claim:
A calibration method for reducing modulation errors in a telecommunication transmitter apparatus, the calibration method including the steps of: providing a pair of test signals, the test signals being substantially in quadrature to each other; iterating an estimation loop including: generating a modulated signal by modulating the test signals, the modulation introducing a modulation error; obtaining a squared signal corresponding to the square of the modulated signal; calculating a transformed signal corresponding to the squared signal in the frequency domain; calculating an error indicator according to the modulus of the transformed signal, the error indicator being indicative of the modulation error; calculating a compensation, to be applied to the test signals for counterbalancing the modulation error, according to the error indicator, and applying said compensation to the test signals, until the error indicator reaches a threshold, and storing an indication of the compensation resulting from a last iteration of the estimation loop for the application of the compensation to each pair of operative signals managed by the telecommunication transmitter apparatus during operation thereof.