Patent ID: 7110727

Claim:
A method for determining separate radio frequency gains for different carriers in a multi-carrier transmitter of a radio transmission unit of a radio communications system, the multi-carrier transmitter comprising means for modulating at least two different carriers with modulation signals, means for summing the modulated carriers output by the means for modulating, and a multi-carrier power amplifier for amplifying the summed modulated carriers for transmission, the method comprising: determining power of the summed modulated carriers output by the multi-carrier power amplifier for at least as many different sets of powers (REF 1 –REF N ) of signals modulated onto the different carriers as there are carriers; and evaluating the sets of powers (REF 1 –REF N ) of signals used for modulation and corresponding powers of the summed modulated carriers output by the multi-carrier power amplifier to mathematically determine a radio frequency gain (G 1 –G N ) between input signals to the means for modulating and the output of the multi-carrier power amplifier.