That way, pre-distorter of the power amplifier and the power amplifier and the non-linear system reverse characteristic identification equipment

摘要

The invention discloses a nonlinear system, in particular a device and a method for identifying inverse characteristic of a nonlinear power amplifier, a predistorter of the power amplifier and power amplification equipment using the device for identifying the inverse characteristic of the nonlinear system and the predistorter. The method for identifying the inverse characteristic of the nonlinear system according to an original input signal x(n) and a corresponding feedback output signal yG(n) of the nonlinear system comprises the following steps: according to an inverse filter signal xF (n) and the feedback output signal yG(n), calculating an inquiry form function Q[.]; according to the feedback output signal yG(n) and the inquiry form function Q[.], generating a middle predistortion signal z(n); according to the middle predistortion signal z(n) and the original input signal x(n), constructing a filter function F[.]; carrying out inverse filtering on the original input signal x(n) by using parameters of the filter function F[.] to generate an inverse filter signal xF(n); repeating each step through iteration till meeting the set condition, wherein the inquiry form function Q[.] and the filter function F[.] represent the inverse characteristic of the nonlinear system.