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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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On the Phase Sequence Set of SLM Scheme for Crest Factor Reduction in OFDM System

OFDM 시스템의 Crest 값을 감소하기 위한 SLM 기법의 위상 시퀀스에 관한 연구

  • 임대운 (서울대학교 전기.컴퓨터공학부) ;
  • 허석중 (서울대학교 전기.컴퓨터공학부) ;
  • 노종선 (서울대학교 전기.컴퓨터공학부) ;
  • 정하봉 (홍익대학교 전기전자공학부)
  • Published : 2006.09.01
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Abstract

The crest factor distribution of orthogonal frequency division multiplexing (OFDM) symbol sequences is evaluated and it is shown that OFDM symbol sequences with a short period are expected to have a high crest factor. The crest factor relationship between two input symbol sequences, Hamming distance D apart is also derived. Using these two results, we propose two criteria for a phase sequence set of the selected mapping (SLM) scheme and suggest the rows of the cyclic Hadamard matrix constructed from an m-sequence as the near optimal phase sequence set of the SLM scheme.

본 논문은 직교 주파수 분할 다중 반송파 (OFDM) 시스템에서 입력 심볼 시퀀스의 주기와 연관하여 crest 값의 확률 분포를 유도하였고, 이로부터 입력 심볼 시퀀스의 주기가 짧을수록 OFDM 신호가 확률적으로 큰 crest 값을 갖는다는 것을 보인다. 다음으로 해밍 거리가 D인 두 입력 심볼 시퀀스의 crest 값 관계를 유도 한다. 이 두 결과를 이용하여 OFDM 시스템의 crest 값을 감소하기 위한 선택 사상 기법(SLM)에서 사용되는 위상 시퀀스 집합의 두 가지 조건을 제시한다. 마지막으로 m-시퀀스를 순환 이동하여 생성한 순환 하다마드 (cyclic Hadamard) 행렬의 행들로 구성한 집합을 최적에 근사한 위상 시퀀스 집합으로 제안한다.

Keywords

References

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