Power amplifying apparatus and method using pre-distortion...

Details Power amplifying apparatus and method using pre-distortion... Power amplifying apparatus and method using pre-distortion...

2006-06-27

2006-06-27

Mottola, Steven J. (Department: 2817)

Amplifiers

Hum or noise or distortion bucking introduced into signal...

Reexamination Certificate

active

07068102

ABSTRACT:
A new concept of power amplifying apparatus and method is developed for adopting pre-distortion and applying to a radio communication system. The power amplifying apparatus includes a pre-distortion module for pre-distorting an input signal x(n) according to a pre-distortion function, and for outputting a pre-distorted signal z(n), a power amplifier for amplifying a signal obtained by digital-to-analog conversion of the pre-distorted signal z(n), a pre-distortion function producing module for receiving the pre-distorted signal z(n) and a signal y(n) obtained by analog-to-digital conversion of the fed-back output signal of the power amplifier, and for obtaining model coefficients cq,k,sthat minimize the power of a modeling error signal e(n)=z(n)−y(n). The pre-distortion function used by the pre-distortion module is represented asz⁡(n)=∑q=0Q⁢∑k=1K⁢∑s=-Smin⁢⁢(S,q)⁢cq,k,s⁢y⁡(n-q+s)⁢y⁡(n-q)k-1.

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