Patent ID: 9647717
Date: 2017-05-09
CPC Classifications: H03F,H04B,H04L

Claim:
1. A method of obtaining a digital pre-distortion parameter, applied in a pre-distortion system, the method comprising: after a beginning of periodic filtering, obtaining, by a pre-distorter, a pre-distorted signal, and obtaining, by a power amplifier, a power-amplified first feedback signal, wherein the pre-distorted signal is obtained in the following pre-distortion model: wherein z(n) represents the pre-distorted signal output at an instance of time n, x(n) represents an original signal input at the instance of time n, n represents the instance of time at which the original signal is input, m represents an instant of time at which the original signal is memorized, w represents a pre-distortion parameter, M represents a memory depth, Q represents a nonlinear order, L represents the maximum number of interleaving samples, q represents a nonlinear order index, * represents conjugation of the signal, l represents an interleaving sample, x(n−m) represents the original signal, and x*(n−m) represents a conjugated signal of the original signal; removing, by a calculator, a rated linear gain from the power amplified first feedback signal to obtain a second feedback signal; determining, by the calculator, the pre-distortion parameter according to a matrix formed from the second feedback signal, and a matrix formed from the pre-distorted signal; and updating, by the pre-distorter, a table of pre-distortion parameter indexes using the determined pre-distortion parameter.