Method and system of adaptive predistortion of a wireless transmitter

A power amplifier apparatus comprising:

• a power amplifier;
• an adaptive predistorter;
• at least two look-up tables comprising substantially the same number of elements;
• a seeding means adapted to provide and store a plurality of first coefficients in the first look-up table and a plurality of corresponding second coefficients in the second look-up table;
• a first selection means adapted to select one of the first coefficients from the first look-up table;
• a processing means adapted to process a first signal with the selected first coefficient to produce an input signal for the power amplifier;
• an error calculating means adapted to calculate an error value from an output signal from the power amplifier and a previously selected first coefficient;
• a second selection means adapted to select a stored second coefficient corresponding with the previously selected first coefficient;
• a first adaptation engine adapted to update the previously selected first coefficient with a value calculated from the error value and the second coefficient;
• a second adaptation engine adapted to update the second coefficient;
• and
• a data writing means adapted to replace the previously selected first coefficient in the first look-up table with the updated first coefficient;
• and to replace the corresponding second coefficient in the second look-up table with the updated second coefficient.