| 摘要 |
<p>The invention concerns an adaptive predistorter for applying a predistortion gain to an input signal (IQ IN ) to be amplified by a power amplifier having a variable supply voltage (V S ), the predistorter comprising: a predistortion gain block (202) adapted to apply a complex gain (G) to a complex input signal; a first table (T1, T2) implemented in a first memory and comprising a 2-dimensional array of cells storing complex gain values, the first table adapted to output said complex gain values based on an amplitude of the input signal and the value of the variable supply voltage of the power amplifier; and a second table (T2, T1) implemented in a second memory and comprising a 2-dimensional array of cells storing gain update values for updating the complex gain values of the first table, the gain update values being generated based on an output signal of said power amplifier.</p> |
