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The Journal of The Korea Institute of Intelligent Transport Systems Vol.9 No.4 pp.32-42
모바일 WiMax용 카르테시안 벡터 모듈레이터 전치왜곡기의 선형성 개선에 관한 연구
A Study on Linearity Improvement of Cartesian Vector Modulator Predistorter for WiMax Applications
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.
