Method and apparatus for providing adaptive predistortion in pow

Details Method and apparatus for providing adaptive predistortion in pow Method and apparatus for providing adaptive predistortion in pow

1999-05-06

2000-09-12

Pascal, Robert

Amplifiers

With amplifier condition indicating or testing means

330129, 330149, G01R 1900, H03G 320, H03F 126

Patent

active

061183350

ABSTRACT:
A high power amplifier (103, FIG. 7) comprises a basic power module (15, FIG. 7), a parameter generator (50, FIG. 7), an amplifier gain model (60, FIG. 7), and a predistortion module (40, FIG. 7). The high power amplifier amplifies a linear radio frequency signal with a minimum of distortion, even near its maximum power output, by using an adaptive predistortion algorithm comprising an amplifier gain model 60 based upon a polynomial function of the power module 15 gain function and a time constant. The input signal into the amplifier 103 is continually compared with the amplifier 103 output using a Kalman filter, and model parameters are generated to model 60, which generates distortion compensating values that are combined with the input signal in predistortion module 40 to produce a predistorted input signal into power module 15, which generates the amplifier output. Also described are a method (70, FIG. 8) of operating the power amplifier and a base station (101, FIG. 9) utilizing the power amplifier for wireless communication.

REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 5148448 (1992-09-01), Karam et al.
patent: 5870668 (1999-02-01), Takano et al.
patent: 5892397 (1999-04-01), Belcher et al.
patent: 5929703 (1999-07-01), Sehier et al.
patent: 5990738 (1999-11-01), Wright et al.

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