Power amplifying apparatus and method using pre-distortion and radio communication system including the same apparatus

摘要

A new concept of power amplifying apparatus and method is developed for adopting pre-distortion and applying to a radio communication system. The power amplifying apparatus includes a pre-distortion module for pre-distorting an input signal x(n) according to a pre-distortion function, and for outputting a pre-distorted signal z(n), a power amplifier for amplifying a signal obtained by digital-to-analog conversion of the pre-distorted signal z(n), a pre-distortion function producing module for receiving the pre-distorted signal z(n) and a signal y(n) obtained by analog-to-digital conversion of the fed-back output signal of the power amplifier, and for obtaining model coefficients c_q,k,s that minimize the power of a modeling error signal e(n)=z(n)-y(n). The pre-distortion function used by the pre-distortion module is represented as $z\left(n\right)=\sum _{q=0}^Q\sum _{k=1}^K\sum _{s=-S}^{\min \left(S,q\right)}{c}_{q,k,s}y\left(n-q+s\right){y\left(n-q\right)}^{k-1}.$