ADDITIVE DIGITAL PREDISTORTION SYSTEM EMPLOYING PARALLEL PATH COORDINATE CONVERSION

摘要

A digital predistortion system and method employing parallel signal paths is disclosed. A first primary signal path receives a rectangular (I, Q) input signal (100) and provides it to an additive predistortion correction circuit (118). A second parallel signal path includes coordinate rotation circuitry (106) and a predistortion coefficient look up table (109). Any effects of calculational errors on the primary input signal are minimized by avoiding manipulations of the input signal in the primary signal path. A third parallel signal path may be used to receive the input signal for calculating adaptive updates to the look up table entries.