| 摘要 |
An apparatus and method is provided for linearizing the characteristic of a power amplifier in the mobile radio communication system by compensating for the non-linear characteristic of active elements included in a transmitting stage of the system. The apparatus includes an error detector for detecting an error between input and output signals of the power amplifier by comparing the fed-back output signal with the input signal, a predistortion lookup table for storing predistortion data, a predistortion lookup table controller for updating the data of the predistortion lookup table which corresponds to the position of the present input data by adding an error signal from the error detector to an output of the predistortion lookup table, a feedforward lookup table for storing feedforward control data, a feedforward lookup table controller for outputting corresponding feedforward control data of the feedforward lookup table by detecting a size of the error signal, a linearizer for distorting the input signal in accordance with the predistortion data and then controlling a gain of the input signal in accordance with the feedforward control data, and the power amplifier for power-amplifying an output of the linearizer.
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