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A Study on Linearity Improvement of Cartesian Vector Modulator Predistorter for WiMax Applications  

Chun, Sang-Hyun (광운대학교 전파공학과)
Kim, Ji-Yeon (광운대학교 RFIC센터)
Kim, Jong-Heon (광운대학교 전파공학과)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.9, no.4, 2010 , pp. 32-42 More about this Journal
Abstract
In this paper, we represent considering parameters for design of a Cartesian vector modulator predistorter to maximize linearity improvement of the predistorter and propose an advanced Cartesian vector modulator predistrotrer with nonlinear starting point control circuit. In order to confirm the performance of the proposed predistorter, the predistorter is applied to power amplifier with 15 W output power for 2.5 GHz band mobile WiMax 1-FA signal. From the measured results, ACLR of -45.3 dBc with 4 dB improvement of ALCR compared with the previous predistorter is obtained and linearity improvement range is also extended.
Keywords
Predistorter; linearity; cartesian vector modulator; AMtoAM; AMtoPM;
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