Power and Spectrum Efficiencies Considering the HPA Nonlinearity in OFDM Communication System

OFDM 통신 시스템에서 비선형 증폭기 특성을 고려한 전력 효율과 대역 효율

  • 이재은 (충북대학교 전자공학과 및 컴퓨터정보통신연구소) ;
  • 윤기후 (주성대학교 디지털정보제어공학과) ;
  • 이준서 (충북대학교 전자공학과 및 컴퓨터정보통신연구소) ;
  • 유흥균 (충북대학교 전자공학과 및 컴퓨터정보통신연구소)
  • Published : 2003.06.01

Abstract

It is important to consider the nonlinear effects of the HPA(High Power Amplifier) in the OFDM communication systems and other digital communication systems as well. In this paper, we investigate a new performance figure-of$.$merit(D) that reflects both power and spectrum efficiencies. The performance figure-of-merit is expressed to include the spectrum and power efficiencies that depend on the magnitude of IBO(Input Backoff) and the number of subcarriers. So, we analyze the variation characteristics of the power efficiency and spectrum efficiency which has the tradeoff relationship.

OFDM 시스템뿐만 아니라 통신 시스템에서는 HPA(High Power Amplifier)의 비선형 특성을 고려하는 것이 중요하다. 본 논문에서는 OFDM통신 시스템에서 전력 효율과 대역효율을 동시에 고려한 새로운 성능 평가지수(D)를 분석한다. IBO(Input Backoff)의 크기와 부반송파 수에 따라 다른 값을 갖는 비선형 왜곡 잡음 성분(Nd)을 고려하며, 대역폭의 변화에 따른 대역 효율을 사용하여 성능 지수를 구함으로써 IBO에 대해 서로 상반관계 (tradeoff)에 있는 전력 효율과 대역 효율의 특성을 분석하였다.

Keywords

References

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