Method and apparatus for performing digital pre-distortion

Details Method and apparatus for performing digital pre-distortion Method and apparatus for performing digital pre-distortion

2007-03-20

2007-03-20

Nguyen, Khanh Van (Department: 2817)

Amplifiers

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

C330S002000

Reexamination Certificate

active

10919029

ABSTRACT:
A pre-distorter that compensates for amplitude and phase distortion created by an amplifier. During a training session, the amplifier is stimulated with input signals of pre-selected amplitude and phase at various temperatures and the amplifier output is captured and converted into data sets. Polynomials are then fitted to the data sets and inverses of the polynomials are determined. The coefficients of the inverse polynomials are then saved for each temperature. During operation, the amplifier temperature is predicted based on the amplifier input signal and the coefficients associated with the predicted temperature are selected to be applied to the input signal to compensate for amplitude and phase distortion caused by the amplifier.

REFERENCES:
patent: 5900778 (1999-05-01), Stonick et al.
patent: 6853246 (2005-02-01), Bauder et al.
patent: 2006/0022751 (2006-02-01), Fuller et al.

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