Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Digital Predistortion for Concurrent Dual-Band Transmitter Based on a Single Feedback Path

이중대역 송신 시스템을 위한 단일 피드백 디지털 전치왜곡 기법

  • Received : 2016.10.24
  • Accepted : 2016.11.14
  • Published : 2017.03.31
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Abstract

A new digital pre-distortion technique to linearize power amplifier (PA) is proposed for concurrent dual-band transmitters. In the conventional dual-band DPD techniques, two independent dual-feedback paths are required to compensate nonlinear cross-products between different bands as well as the nonlinear self-products of each band's own signal. However, it increases hardware complexity and expense. In this paper, we propose a new DPD method requiring only a single feedback path. In this new structure, the proposed technique first estimates the dual-band PA characteristics using the single feedback path. The DPD parameters are then extracted from the estimated PA characteristics. The DPD performance of the proposed method is validated through computer simulation. According to the results, the proposed technique can achieve comparable performance to the conventional two feedback DPD with significantly reduced hardware complexity.

본 논문에서는 이중 대역 송신시스템에서 비선형 전력증폭기를 선형화하기 위한 새로운 디지털 전치왜곡 기법을 제안한다. 기존의 시스템에서는 자기 대역의 비선형뿐만 아니라 타 대역간의 비선형을 보상하기 위해 두 개의 피드백 경로가 요구되는데 이는 하드웨어의 복잡도와 비용을 증가시킨다. 반면 제안하는 전치왜곡 시스템은 한 개의 피드백 경로만을 사용한다. 따라서 기존 시스템에 비해 훨씬 간단한 구조를 가진다. 제안하는 기법은 전치왜곡 계수를 얻기 위해서 한 개의 피드백 경로를 공유하여 두 대역의 전력증폭기 특성을 먼저 추정하고 추정된 전력증폭기 특성으로부터 전치왜곡 계수를 얻는다. 컴퓨터 모의실험 결과에 따르면 제안된 방식은 두 개의 피드백 회로를 구성한 기존 방식과 대등한 선형화 성능을 보인다.

Keywords

References

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