Patent ID: 8891675

Claim:
A method of power amplifier digital pre-distortion comprising the steps of: measuring a current power level of the power amplifier; storing in a look up table a set of entries, each entry consisting of a power level and a corresponding set of digital pre-distortion coefficients; selecting an set of digital pre-distortion coefficients by if the measured current power level falls within a range associated with a power level index in the look up table, recalling from the look up table the set of digital pre-distortion coefficients corresponding to the power level index, if the measured current power level is greater than the maximum power level entry in the look up table, recalling from the look up table the set of digital pre-distortion coefficients corresponding to the maximum power level entry in the look up table, if the measured current power level is less than the minimum power level entry in the look up table, recalling from the look up table the set of digital pre-distortion coefficients corresponding to the minimum power level entry in the look up table, and if the measured current power level does not fall within a range associated with a power level index in the look up table recalling a first set of digital pre-distortion coefficients corresponding to a next power level index below the measured power level, recalling a second set of digital pre-distortion coefficients corresponding to a next power level index above the measured power level, and interpolating a third set of digital pre-distortion coefficients from the first set of digital pre-distortion coefficients and the second set of digital pre-distortion coefficients; generating a digital pre-distortion from the selected set of digital pre-distortion coefficients; and applying the digital pre-distortion to the power amplifier.