Telecommunications – Transmitter
Reexamination Certificate
2006-03-29
2008-03-04
Nguyen, Simon (Department: 2618)
Telecommunications
Transmitter
C455S114300, C455S127200, C375S297000
Reexamination Certificate
active
07340223
ABSTRACT:
The invention is related to methods and apparatus for controlling and adapting a digital predistortion linearizer for amplification of bandlimited signals using non-linear amplifiers. The control method advantageously permits the predistortion function applied by a predistortion entity to provide a relatively constant gain. This attribute is advantageous for operation within cellular radio systems, which often employ digital power control systems. However, the disclosed techniques can also be applicable to virtually any type of digital predistortion for which an input signal or reference signal to be amplified is predistorted in a manner that is complementary to the distortion induced by a non-linear amplifier. Embodiments of the invention advantageously enhance the practicality of using digital linearization and predistortion amplification techniques. Embodiments of the invention can automatically adjust the characteristics of a predistorted signal so that a deviation from overall linearity is compensated and subsequently reduced while maintaining a nearly constant gain attribute.
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Ho Derek J. W.
Klijsen Bartholomeus T. W.
Wright Andrew S.
Knobbe Martens Olson & Bear LLP
Nguyen Simon
PMC-Sierra Inc.
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