| 摘要 |
<p>The present invention relates to a method and apparatus for adaptive digital predistortion in a radio transmitter, characterized in that said method comprising the steps of: a) preforming the non-linear transformation of a input baseband signal contrary to the characteristic of the transmission channel by the digital predistorter; b) the predistorted signal being amplified by the power amplifier after up conversion; c) feeding a part of the signals output from the PA back into an adaptive controller through a coupler; d) the adaptive controller preforming the digital signal process of the feedback signal to obtain a radiation energy of outband; e) updating the parameters of the predistorter using the method of optimization of multi-paramaters with the radiation energy of outband as a objective function. The adaptive digital predistortion system for broadband radio transmitter can pre-distort the signals to be transmitted to eliminate the non-linear characteristic of the transmission channel and to suppress the radiation energy of outband of the output signal. The predistortion system also can adaptively adjust the predistortion parameters using optimal algorithm of multi-paramaters according to non-linear slow-variety of the transmission channel.</p> |
