Patent ID: 7068102
Filing Date: 2006-06-27
Classification: H03F

Abstract:
1. A power amplifying apparatus using pre-distortion, comprising: a pre-distortion module for pre-distorting an input signal x(n) according to a pre-distortion function, and for outputting a predistorted signal z(n), a power amplifier for amplifying a signal obtained by digital-to-analog conversion of the pre-distorted signal z(n), and 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 coefficents c wherein, Q is a maximum number of memory depth in an actual implementation, K is a maximum order of nonlinear polynomial to be implemented in the pre-distortion system, S is a maximum memory depth of cross-memory terms to be considered in the pre-distortion implementation, q is an indexing variable for summation operation over memory from 0 up to Q, k is an indexing variable for summation operation over polynomial order from 1 up to K, s is an indexing variable for summation operation over cross-memory depth from −S up to min(S, q) and c q,k,s is a model coefficient corresponding to the specific values of q, k and s.