Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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ICI Cancellation of OFDM System with Multiple Frequency offsets

직교 주파수 분할 다중화 시스템에서 다중 주파수 옵셋에 의한 채널간 간섭 제거기법

  • Won, Yu-Jun (Department of Electronics Engineering, Chungbuk National University) ;
  • Seo, Bo-Seok (Department of Electronics Engineering, Chungbuk National University)
  • 원유준 (충북대학교 전자정보대학 전자공학과) ;
  • 서보석 (충북대학교 전자정보대학 전자공학과)
  • Received : 2009.12.31
  • Accepted : 2010.03.17
  • Published : 2010.03.30
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Abstract

In this paper, an interchannel interference (ICI) cancellation method is proposed for multiple frequency offsets in orthogonal frequency division multiplexing (OFDM) systems. When several same signals are received from different transmitters simultaneously, multiple frequency offsets may occur at the receiver because of the frequency difference of the oscillators of the two transmitters and the receiver. This causes degradation of system performance because OFDM systems are very sensitive to the frequency offsets. In this paper, we propose a method to eliminate the effect of the multiple frequency offsets for OFDM systems. The method is accomplished in two steps: compensation of the frequency offset in the time domain and subsequent cancellation of the ICI in the frequency domain. Through computer simulations, we verify the effectiveness of the proposed ICI cancellation method.

이 논문에서는 직교 주파수 분할 다중화(orthogonal frequency division multiplexing : OFDM) 시스템의 수신기에서 발생하는 다중주파수 옵셋의 영향을 제거하는 방법을 제안한다. 다중 주파수 옵셋은 서로 다른 송신기로부터 동일한 신호를 수신할 때, 두 송신기의 발진 주파수가 서로 다르기 때문에 발생한다. OFDM 시스템은 주파수 옵셋에 매우 민감한 특성을 가지므로, 이러한 다중 주파수 옵셋은 시스템 성능에 치명적인 영향을 미친다. 이 논문에서는 시간 영역에서의 주파수 보정과 주파수 영역에서의 채널간 간섭 제거방법을 적용하여 다중 주파수 옵셋에 의한 영향을 효과적으로 제거하는 방법을 제안한다. 컴퓨터 모의실험을 통해 제안한 채널간 간섭 제거방법의 성능을 살펴보았다.

Keywords

References

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