Patent ID: 7817970

Claim:
A transmitting/receiving device for a mobile radio, comprising: a polar modulator which is based on the processing of a digital complex baseband signal in the form of a digital amplitude signal and a digital phase signal, and which comprises an amplifier for amplification of a radiofrequency signal which is dependent on the digital phase signal and whose output power can be modulated as a function of the digital amplitude signal, at least one predistorter, which is connected upstream of the amplifier in the signal direction, for at least partial compensation for distortion caused by the amplifier and with variable predistortion, and a step-up converter, in the form of a directly modulated PLL, for conversion of the digital phase signal or of a signal which is dependent on it to a modulated radio-frequency signal, which step-up converter is synchronized via a reference signal with a reference frequency, a harmonic generator for generation of one or more harmonics of the reference frequency, a receiving path which is used both for reception of radio signals and for the purposes of adjustment of the at least one predistorter in order to determine a measurement signal which is dependent on the output signal from the amplifier wherein the reception path has a step-down converter, whose local oscillator input is driven as a function of one or more of the harmonics which are produced by the harmonic generator a coupling path for electrical coupling of the input of the reception path to the output of the amplifier for the purposes of adjustment of the at least one predistorter, and a control and evaluation means for adjustment of the at least one predistorter as a function of the measurement signal.