Pre-distortion of non-linear devices

Details Pre-distortion of non-linear devices Pre-distortion of non-linear devices

2007-09-11

2007-09-11

Mottola, Steven J. (Department: 2817)

Amplifiers

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

Reexamination Certificate

active

10508314

ABSTRACT:
New technology is described to calculate and optimize a pre-distorter avoiding the need of time-alignment between input and output of the amplifier. An analog output spectrum is used to compute an optimum pre-distorter, either in digital or analog format. The output spectrum is used to optimize intermodulation performance rather than trying to match the input spectrum to the output spectrum. The output spectrum (except for a possible gain constant) can be used as input to the optimization procedure. Since the intermodulation products usually are of much lower amplitude than the carriers themselves, it can be taken as the input spectrum without major loss of confinement. Mathematical procedures to calculate a pre-distorter using only the output signal are outlined.

REFERENCES:
patent: 6246865 (2001-06-01), Lee
patent: 7136628 (2006-11-01), Yang et al.
Murali Tummla et al., “Volterra Series Based Modeling and Compensation of Nonlinearties in High Power Amplifiers”, IEEE, 1997, pp. 2417-2420.
Sekchin, Chang et al., “A Compensation Scheme for Nonlinear Distortion in OFDM Systems”, IEEE, 2000, pp. 736-740.
Anding Zhu et al., “An Adaptive Volterra Predistorter for the Linearization of RF High Power Amplifiers”, IEEE MTT-S Digest, 2002, pp. 461-464.

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