Pre-distortion method, associated apparatus and non-transitory machine readable medium

摘要

A pre-distortion method includes: receiving an input data; and obtaining a pre-distortion output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier; and multiplying a reciprocal of a pre-distortion ratio of the output of the power amplifier to the input data by the output of the power amplifier. A pre-distortion apparatus includes a receiver, a pre-distortion unit and a gain compensating unit. The receiver is utilized for receiving an input data. The pre-distortion unit is utilized for obtaining a pre-distortion output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier. The gain compensating unit is utilized for multiplying a reciprocal of a pre-distortion ratio of the output of the power amplifier to the input data by the output of the power amplifier.

主权项

1. A pre-distortion method, comprising:
receiving an input data; obtaining a pre-distorted output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier; obtaining a pre-distortion ratio, wherein the pre-distortion ratio is an output of the power amplifier to the input data; and multiplying a reciprocal of the pre-distortion ratio with the output of the power amplifier; wherein the step of obtaining the pre-distorted output by inputting the input data into the pre-distortion function comprises:
deriving a plurality of coefficients corresponding to each of a plurality of power levels of the pre-distorted output within a specific power level range by utilizing an adaptive algorithm, wherein the plurality of coefficients includes at least a first coefficient and a second coefficient of a function of the power amplifier;storing a reciprocal of the at least a first coefficient corresponding to each of the plurality of power levels into a first look-up table;storing the at least a second coefficient corresponding to each of the plurality of power levels into a second look-up table; andderiving the pre-distortion function according to the first look-up table and the second look-up table in order to mitigate or cancel unwanted characteristics of the power amplifier.