A narrow-band power amplifier with adaptive predistorter and negative feed-back

Yitao Zhang, Osamu Muta, Yoshihiko Akaiwa

Research output: Contribution to conferencePaperpeer-review


As a method to compensate for the nonlinear distortion of a power amplifier, the adaptive predistorter and the negative feed-back system are known. Although the feed-back method is a simple technique, its instability becomes a problem for a high feedback gain to achieve a high compensation effect. On the other hand, the predistorter needs long time to calculate the suitable parameters. In this paper, we propose a nonlinear distortion compensation method for a narrow-band signal. In this method, adaptive predistorter and negative feedback are combined. In addition, to shorten the convergence time to minimize non-linear distortion, a variable step-size (VS) method is also applied to the algorithm to find the parameters of adaptive predistorter. With computer simulations, we show that the proposed scheme achieves both five times faster convergence speed than that of the predistorter and three times higher permissible delay time in the feed-back amplifier than that of a negative feed-back only amplifier, even when the VS algorithm is employed in both the conventional and the proposed systems.

Original languageEnglish
Number of pages6
Publication statusPublished - 2006
EventGMC'2006: 2006 Global Mobile Congress - Beijing, China
Duration: Oct 9 2006Oct 11 2006


OtherGMC'2006: 2006 Global Mobile Congress

All Science Journal Classification (ASJC) codes

  • General Engineering


Dive into the research topics of 'A narrow-band power amplifier with adaptive predistorter and negative feed-back'. Together they form a unique fingerprint.

Cite this