Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Performance Analysis of ICI reduction in OFDM system

OFDM시스템에서 ICI 감소 기술의 성능해석

  • 장은영 (동아대학교 전자공학과) ;
  • 변건식 (동아대학교 전자공학과)
  • Published : 2007.06.30
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Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is an emerging multi-carrier modulation scheme, which has been adopted for several wireless standards such as IEEE 802.11a and HiperLAN2. A well-known problem of OFDM is its sensitivity to frequency offset between the transmitted and received carrier frequencies. This frequency offset introduces inter-carrier interference (ICI) in the OFDM symbol. This paper investigates three methods for combating the effects of ICI: ICI self-cancellation (SC), maximum likelihood (ML) estimation, and extended Kalman filter (EKF) method. These three methods are compared in terms of bit error rate performance.

OFDM은 IEEE802.11a와 HiperLAN2와 같은 여러 가지 무선 표준에 적용되고 있는 다중 캐리어 변조 기술이다. OFDM의 문제 중 하나는 송신기와 수신기 캐리어 주파수 사이의 주파수 offset에 민감하다는 것이다. 이러한 주파수 옵셋은 OFDM 심볼에 ICI(Inter-carrier interference)를 유발한다. 본 논문에서는 ICI의 영향을 제거하는 3가지 방법, 즉 ICI self-cancellation(SC), 최대가능도 추정(Maximum Likelihood), 확장 칼만 필터(Extended Kalman Filtering) 방법을 제안하고 성능을 비교 평가한다.

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References

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