Power Amplifier Linearization using the Polynomial Type Predistorter

다항식형 전치왜곡기를 이용한 전력증폭기 선형화

  • 민이규 (한양대학교 전자전기공학부) ;
  • 이상설 (한양대학교 전자전기공학부)
  • Published : 2001.12.01

Abstract

This paper presents the new architecture of an adaptive predistortion linearizer using the polynomial type predistorter. In the proposed linearizer, most of the processes, including the predistortion, are performed with a digital signal processor(DSP). The recursive least squares(RLS) algorithm is employed for the optimization process to minimize the errors between the predistorter and postdistorter output signals. Simulation results demonstrate that the adjacent channel power ratio(ACPR) is improved by greater than 40 dB at the band edge with linearization. The convergence and reconvergence performance of the linearizer is also satisfactory.

다항식형 전치왜곡기를 이용한 적응 전치왜곡 선형화기의 새로운 구조를 제안한다. 제안된 선형화기에서는 전치왜곡을 포함한 대부분의 연산이 DSP(digital signal processor)로 수행된다. 전치 왜곡기의 출력신호와 후처리기 의 출력 신호 사이 의 오차를 최소화하기 위하여 RLS(recursive least squares) 앨거리즘을 적용한다. 씨뮬레이션 결과 ACPR(adjacent channel power ratio)이 대역 가장자리에서 40 dB 이상 개선된다. 선형화기의 수렴 및 재수렴 특성 역시 만족스러운 성능을 보인다.

Keywords

References

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