| 摘要 |
<p>The present invention relates to adjusting predistortion of a radio frequency signal in a feedback path (2) of a radio transmitter (1), said radio frequency signal comprising a wanted signal band (16) and first and second intermodulation distortion signal sidebands (14, 15) in frequency domain. The feedback radio frequency signal is successively multiplied by at least two different frequencies to generate at least two frequency shifted signals. The frequency shifted signals are successively converted into at least two digital signals which are summed up to a single digital signal. Preferably, the total bandwidth (11) of the feedback radio frequency signal is divided into a plurality of bandwidth sections (12, 13), wherein the bandwidth sections (12, 13) are smaller than the total bandwidth (11) and are successively multiplied by a corresponding frequency.</p> |
