Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Link-level Performance of SC-FDM using a Turbo Equalizer

터보 등화기를 적용한 SC-FDM의 링크-레벨 성능

  • Lee, Joongho (Department of Electronics & Electrical Engineering, Dankook University) ;
  • Lim, Jaehong (Department of Electronics & Electrical Engineering, Dankook University) ;
  • Yoon, Seokhyun (Department of Electronics & Electrical Engineering, Dankook University)
  • 이중호 (단국대학교 전자전기공학부) ;
  • 임재홍 (단국대학교 전자전기공학부) ;
  • 윤석현 (단국대학교 전자전기공학부)
  • Received : 2014.08.18
  • Accepted : 2014.10.28
  • Published : 2014.11.25
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Abstract

Single-Carrier Frequency division multiplexing (SC-FDM) has been selected for the uplink transmission technique in 3GPP-LTE since it has an advantage of low peak-to-average power ratio (PAPR) in user's perspective. The receiver typically uses a frequency domain equalizer, which, however, suffers from noise boost and/or residual ISI especially when the channel has deep nulls. In this paper, we propose using turbo equalizer to mitigate such a problem. We provide link level performance comparison and an insight into how many iteration is needed for reasonable performance and complexity.

단일반송파기반 주파수다중화(SC-FDM) 방식은 각 사용자 입장에서는 단일반송파 전송 방식으로 피크대 평균 전력비(PAPR)가 낮다는 장점이 있어 전송전력에 제한이 있는 3GPP LTE의 상향링크 전송방식으로 채택되었다. 일반적으로 SC-FDM 신호의 수신은 주파수 영역 등화기를 사용하는데 이는 채널에 깊은 널(null)이 존재하는 경우 잉여의 심볼 간 간섭과 잡음의 증폭이 커지는 문제점이 있다. 본 논문에서는 이러한 문제를 개선하기 위하여 주파수 영역 터보 등화기를 사용하는 SC-FDM 수신기를 제안하고 이의 링크레벨 성능을 평가한다. 또한, 성능-복잡도 교환(Tradeoff)을 고려한 적절한 반복 횟수를 제시한다.

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