The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Bit SLM Scheme for Peak to Average Power Ratio Reduction in OPDM Systems

직교 주파수 분할 다중화 시스템의 최대전력 대 평균전력의 비 감소를 위한 비트 선택사상 기법

  • 김규홍 (서울대학교 전기.컴퓨터공학부 부호 및 암호 연구실) ;
  • 노형석 (서울대학교 전기.컴퓨터공학부 부호 및 암호 연구실) ;
  • 허석중 (서울대학교 전기.컴퓨터공학부 부호 및 암호 연구실) ;
  • 노종선 (서울대학교 전기.컴퓨터공학부 부호 및 암호 연구실) ;
  • 신동준 (한양대학교 전자.전기.컴퓨터공학부 부호 및 통신연구실)
  • Published : 2008.06.30
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Abstract

Selected mapping is well-known scheme for peak to average power ratio(PAPR) reduction in orthogonal frequency multiplexing(OFDM) systems. In this paper, we proposed a new scheme for generating a set of candidate transmission sequences. In conventional SLM, candidate sequences were generated by rotating the phases of the frequency domain OFDM M-ary symbols but in proposed scheme, candidate sequences are generated by multiplying the m-sequences with data in bit format of OFDM signals. Computer simulation results show that, as compared to the conventional SLM scheme, the proposed approach has better PAPR reduction performance and especially in case of OFDM systems which has small number of subcarriers has better performance than large ones.

선택사상기법(selected mapping; SLM)은 직교 주파수 분할 다중화(orthogonal frequency division multiplexing; OFDM) 시스템에서 최대전력 대 평균전력의 비 (peak to average power ratio; PAPR)를 감소시키는 잘 알려진 기법이다. 본 논문에서는 SLM 기법의 전송 후보 시퀀스를 발생시키는 새로운 방법을 제안한다. 기존의 SLM 기법은 M-ary 심볼의 위상을 회전시켜 전송 후보 시퀀스를 발생 시키지만, 제안된 방법은 원 신호의 이진 데이터에 m-시퀀스를 곱하여 전송 후보 시퀀스를 발생시킨다. 제안된 방법의 PAPR 감소 성능은 기존의 SLM에 비해 우수하였고, 모의실험 결과로부터 적은 수의 부 반송파를 사용하는 시스템에서 더 좋은 성능을 보이는 것을 확인하였다.

Keywords

References

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