Patent ID: 7953379

Claim:
A calibration method for reducing modulation errors in a telecommunication transmitter apparatus, the calibration method including the steps of: providing a plurality of pairs of test signals, the test signals of each pair being substantially in quadrature to each other, wherein the pairs of test signals have a substantially equal energy and are at least in part different; generating a plurality of modulated signals, each modulated signal being generated by modulating a corresponding pair of test signals; calculating a plurality of transformed signals each one corresponding to the square of a corresponding modulated signal in the frequency domain; calculating a plurality of partial error indicators each one as a function of the modulus of a corresponding transformed signal, the partial error indicators being indicative of the modulation errors associated with the modulated signals; calculating a compensation for counterbalancing the modulation errors according to a combination of the partial error indicators; and storing an indication of the compensation for the application of the compensation to each further pair of operative signals during operation of the telecommunication transmitter apparatus.