REDUCED BANDWIDTH DIGITAL PREDISTORTION

摘要

A predetermined nonlinearity may be introduced between a digital predistorter and a power amplifier of a RF transmitter. The nonlinearity may be applied to an output of a digital predistorter. The application of the nonlinearity to the predistorter output may expand a bandwidth of the predistorter output from a first lower bandwidth to a higher second bandwidth of the power amplifier that may be needed to support a predetermined data transfer rate at the RF transmitter. Introducing this nonlinearity between the predistorter and the power amplifier may reduce the sampling rate and power requirements of components included as part of a predistortion device. As a result less noise may be generated and less power may be consumed, resulting in smaller, more efficient, and more accurate predistortion and/or RF transmission systems.

主权项

1. A predistortion device comprising:
a digital predistortion circuit introducing an inversely modeled gain and phase characteristic of a radio power amplifier amplifying signals at a predetermined bandwidth into a digital input signal at a lower bandwidth than the predetermined bandwidth; an digital to analog converter coupled to the digital predistortion circuit; and a nonlinear analog circuit coupled to the digital to analog converter and nonlinearly expanding an analog converted output of the digital predistortion circuit from the lower bandwidth to the predetermined bandwidth.