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

  • 제31권9C호
  • /
  • Pages.889-896
  • /
  • 2006
  • /
  • 1226-4717(pISSN)
  • /
  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

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

On the Phase Sequence Set of SLM Scheme for Crest Factor Reduction in OFDM System

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

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.

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.

키워드

참고문헌

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