Frequency selective predistortion in a linear transmitter

Details Frequency selective predistortion in a linear transmitter Frequency selective predistortion in a linear transmitter

1997-05-07

1999-02-02

Mottola, Steven

Amplifiers

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

455126, H03F 126

Patent

active

058670653

ABSTRACT:
A system for linearly transmitting an amplified output signal using predistortion is disclosed. The system uses a straight inverse modeling scheme to more easily and accurately determine the inverse of the distortion caused by a power amplifier of a RF transmitter. The direct inverse modeling scheme of the present invention indexes the LUT using the modulated input signals instead of the potentially noisier output signals, which helps to increase the accuracy of the predistortion. The predistorter system stores complex coefficients in the LUT, which are then used as the tap weights of a digital filter implementing the predistorter. Finally, the trainer uses a modified version of the power amplifier output signal. The modified power amplifier output signal has the in-band distortion removed from the power amplifier output signal.

REFERENCES:
patent: 5193224 (1993-03-01), McNicol et al.
patent: 5732333 (1998-03-01), Cox et al.
patent: 5748678 (1998-05-01), Valentine et al.

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