Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A OFDM PAPR Reduction Scheme Using Sub-sequence Phase Optimization

서브 시퀀스 위상 최적화 (SPO)를 이용한 OFDM 신호의 PAPR 저감 방법

  • Yoon, Yeo-Jong (Department of Information Communications Engineering, Chungnam National University) ;
  • Lim, Sun-Min (Department of Information Communications Engineering, Chungnam National University) ;
  • Eun, Chang-Soo (Department of Information Communications Engineering, Chungnam National University)
  • 윤여종 (충남대학교 정보통신공학과 이동통신연구실) ;
  • 임선민 (충남대학교 정보통신공학과 이동통신연구실) ;
  • 은창수 (충남대학교 정보통신공학과 이동통신연구실)
  • Published : 2005.12.01
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Abstract

In this paper, we present a new method for the reduction of the PAPR (peak to average power ratio) of OFDM signals. The idea behind the proposed method is that IFFT is implemented often with software for a digital signal processor such that we may avoid the repeated calculations to reduce the computational operations: we define sub-sequences in the IFFT process and then multiply the optimum phase rotation factors to them to minimize the PAPR. The PAPR reduction performance of the proposed method is equal to that of the interleaved partition scheme of the PTS (partial transmit sequence) method with only 1/3 computational operations of it.

본 논문에서는 OFDM 신호의 높은 PAPR(peak to average power ratio)을 저감하기 위한 기법을 제시한다. 이 기법은 OFDM 신호 생성에 사용되는 IFFT를 요즘은 디지털 신호 프로세서에서 소프트웨어로 구현하는 경우가 많다는 점에 착안하여, IFFT의 계산 과정에서 중복되는 계산을 피함으로써 계산량을 줄인다. 즉, IFFT 과정에서 서브-시퀀스(sub-sequence)를 정의하고 이 서브-시퀀스에 최적 위상 회전 요소를 곱하여 PAPR을 최소화한다. 이 기법의 PAPR 저감 성능은, 약 1/3의 계산량으로도 PTS 기법의 인터리브 분할 방식과 동일하다는 것을 보인다.

Keywords

References

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