Digital memory-based predistortion technique

Details Digital memory-based predistortion technique Digital memory-based predistortion technique

H - Electricity

03

F

H03F 1/00 (2006.01) H03F 1/32 (2006.01) H03F 3/20 (2006.01)

Patent

CA 2488472

The present invention discloses a system and a method for memory-based predistortion to reduce the distortion effects introduced by a power amplifier 103. The distortion effects include both memoryless and memory effects. The input and the corresponding output values of the power amplifier 103 are measured to determine models used for predistortion 105. Using these models, first, an amplitude memory signal representing the amplitude memory effects of the power amplifier 103 is obtained. Then, the amplitude memory signal is subtracted from the input signal. On the resulting signal, memoryless amplitude predistortion and memory-based phase predistortion are performed to get a predistorted signal. Further, an inverse model of the linear response of the power amplifier 103 is implemented on the predistorted signal. Finally, the output of the inverse model is amplified by the power amplifier 103 to obtain an output signal having reduced memoryless and memory-based effects.

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