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학술지 Digitally Assisted Feedforward Compensation of Cartesian-Feedback Power-Amplifier Systems
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저자
부현호, SungWon Chung, Joel L. Dawson
발행일
201108
출처
IEEE Transactions on Circuits and Systems II : Express Briefs, v.58 no.8, pp.457-461
ISSN
1549-7747
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TCSII.2011.2158274
협약과제
11MB1500, 차세대 무선 융합 단말용 Advanced Digital RF 기술 개발, 유현규
초록
This brief describes digitally assisted feedforward compensation to extend the bandwidth and to enhance the in-band linearity of Cartesian-feedback (CFB) power-amplifier (PA) systems. The proposed technique combines the strength of the CFB, which is chiefly relaxed PA modeling requirements, with the increased speed of digital predistortion (DPD). CFB is used initially to train efficiently a lookup table for a predistorted feedforward path. Then, both the CFB and the predistorted feedforward path run simultaneously during transmission. Viewed as a bandwidth-enhancement technique for analog CFB, the feedforward-compensated system shows a linearization bandwidth improvement of almost six times over the unaided feedback system. Viewed as a means of improving the in-band linearity of CFB, the proposed system realizes up to 10 dB of reduction in distortion products over CFB or DPD alone and does so without compromising the stability of the feedback system. © 2011 IEEE.
키워드
Cartesian feedback (CFB), digital predistortion (DPD), digitally assisted, feedforward, intermodulation distortion, power-amplifier (PA) linearization
KSP 제안 키워드
Bandwidth improvement, Cartesian feedback, Feedback system, Feedforward Compensation, digital predistortion(DPD), digitally assisted, in-band, intermodulation distortion, look-up table