Pre-distortion apparatus and method for recovering nonlinear distortion of high power amplifier

A telecommunication system for recovering nonlinear distortion of a transmission signal to be transmitted, comprising:

• a transmitter means for modulating a transmission signal to be transmitted and generating a modulated signal;
• a high power amplifier for amplifying the modulated signal;
• and
• a pre-distortion means for recovering nonlinear distortion of the high power amplifier,
• wherein the pre-distortion means includes:
• a demodulator for demodulating a signal outputted from the high power amplifier, generating a demodulated signal;
• a first storage means for storing the demodulated signal outputted from the demodulator;
• a second storage means for storing a reference transmission signal outputted from a transmitter of a transmitting system;
• a digital signal processor for calculating a pre-distortion coefficient by comparing the demodulated signal and the reference transmission signal stored at the first storage means and the second storage means;
• and
• a third storage means for storing the pre-distortion coefficient calculated at the digital signal processor;
• wherein the digital signal processor comprises:
• an input/output characteristics storage means for storing amplitude and phase characteristics of a high power amplifier;
• and
• a pre-distortion coefficient calculator for calculating the pre-distortion coefficient by comparing amplitude values and phase values of the stored demodulated signal and the stored reference transmission signal with the amplitude and phase characteristics of the high power amplifier.

A method for recovering nonlinear distortion of a high power amplifier in a telecommunication system, comprising the steps of:

• (a) storing a reference transmission signal outputted from a transmitter in the telecommunication system;
• (b) demodulating a signal that is fed back from the high power amplifier, generating a demodulated signal and storing the demodulated signal;
• (c) at a digital signal processor, calculating a pre-distortion coefficient, wherein the calculation comprises:
• calculating an amplitude value and a phase value of the reference transmission signal and the demodulated signal;
• and
• comparing each calculated amplitude value and each calculated phase value with amplitude and phase characteristics of a high power amplifier stored in an input/output characteristics storage;
• (d) storing the pre-distortion coefficient into a look-up table;
• and
• (e) transmitting the pre-distortion coefficient stored at the look-up table to a complex multiplier of the transmitter.

A computer readable recording medium storing instructions for implementing a method for recovering nonlinear distortion of a high power amplifier, the method comprising the steps of:

• (a) storing a reference transmission signal outputted from a transmitter in the telecommunication system;
• (b) demodulating a signal that is fed back from the high power amplifier, generating a demodulated signal and storing the demodulated signal;
• (c) at a digital signal processor, calculating a pre-distortion coefficient, wherein the calculation comprises:
• calculating an amplitude value and a phase value of the reference transmission signal and the demodulated signal;
• and
• comparing each calculated amplitude value and each calculated phase value with amplitude and phase characteristics of a high power amplifier stored in an input/output characteristics storage;
• (d) storing the pre-distortion coefficient into a look-up table;
• and
• (e) transmitting the pre-distortion coefficient stored at the look-up table to a complex multiplier of the transmitter.