Predistorter

Details Predistorter Predistorter

2011-05-17

2011-05-17

Nguyen, Hieu P (Department: 2817)

Amplifiers

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

C375S297000

Reexamination Certificate

active

07944295

ABSTRACT:
The invention aims to converge predistortion coefficients efficiently in a predistorter adapted to compensate for distortion generated in an amplifier. Level detection means detects the level of a signal input to an amplifier. Signal acquisition means acquire a signal output from the amplifier as a feedback signal. Correspondence acquisition means updates a predistortion coefficient expressed using a set of orthogonal polynomials so that a distortion component contained in the acquired feedback signal is reduced and acquires a correspondence between the level of the signal input to the amplifier and a control coefficient for predistortion (contents of a distortion compensation table). Predistortion executing means applies distortion for predistortion with respect to the signal input to the amplifier in accordance with the control coefficient for predistortion that corresponds to the detected level based on the acquired correspondence.

REFERENCES:
patent: 2008/0152037 (2008-06-01), Kim et al.
patent: 2004-112151 (2004-04-01), None
patent: 2005-101908 (2005-04-01), None
Naoki Hongo et al., “A Predistorter for a Power Amplifier Affected by the Even-Order Distortion”, Yagi Memorial Telecommunications Systems Laboratory, 2003 IEEE.
Guangsheng XU, et al., “An Adaptive Predistortion Method Based on Orthogonal Polynomial Expansion for Nonlinear Distortion Compensation, Part II”, The Institute of Electronics, Information and Communication Engineers, IEICE Techincal Report, RCS2007-214(Mar. 2008).
Seiji Ohmori et al., “An Adaptive Predistortion Method Based on Orthogonal Polynommial Expansion for Nonlinear Distortion Compensation”, The Institute of Electronics, Information and Communication Engineers, IEICE Technical Report, RCS2007-214(Jul. 2007).

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