Digital memory-based predistortion technique

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

2006-07-04

2006-07-04

Nguyen, Patricia (Department: 2817)

Amplifiers

Hum or noise or distortion bucking introduced into signal...

C330S136000

Reexamination Certificate

active

07071777

ABSTRACT:
The present invention discloses a system and a method for memory-based predistortion to reduce the distortion effects introduced by a power amplifier. The distortion effects include both memoryless and memory effects. The input and the corresponding output values of the power amplifier are measured to determine models used for predistortion. Using these models, first, an amplitude memory signal representing the amplitude memory effects of the power amplifier 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 is implemented on the predistorted signal. Finally, the output of the inverse model is amplified by the power amplifier to obtain an output signal having reduced memoryless and memory-based effects.

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