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Inter-carrier Interference Reduction Method Using Mask in a Fast Moving OFDM Receiver

고속 이동 OFDM 수신기에서 마스크를 이용한 반송파간 간섭 감소 방법

  • 구영모 (인하공업전문대학 정보통신과)
  • Received : 2013.01.23
  • Accepted : 2013.04.11
  • Published : 2013.05.30

Abstract

In orthogonal frequency division multiplexing system (OFDM), rapid channel variation caused by fast moving receiver leads to a loss of subcarrier orthogonality which results in inter-carrier interference (ICI) and receiver performance degradation. In conventional receivers, performance is enhanced by estimating ICI and removing it from received signals. In this paper, an ICI reduction scheme using a time-domain mask and adding is proposed. The proposed scheme is applied to DVB-T receiver to prove the Doppler mobile performance enhancement.

OFDM 시스템에서 수신기가 고속으로 이동하는 경우에는 채널의 급속한 변화로 인해 반송파 간 직교성이 파괴되고 반송파 간 간섭(ICI)이 발생하여 수신기의 성능을 떨어뜨린다. 기존의 수신기에서는 ICI 를 추정한 후 이를 수신 신호로부터 상쇄시켜 성능을 개선한다. 본 논문에서는 수신 신호를 시간 영역에서 마스킹하고 더하여 발생하는 ICI의 크기를 줄여 수신기의 성능을 개선하는 방법을 제안하고 이를 DVB-T 수신기에 적용하여 도플러 이동 수신 성능을 검증한다.

Keywords

References

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