The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Design of OFDM Signal for Reducing the ICI Caused by Phase Noise

위상잡음에 의한 ICI를 제거하기 위한 OFDM 신호 설계

  • Li Yingshan (Dept. of Electronic and Research Institute of Computer, Information & Communication, Chungbuk National University) ;
  • Hieu Nguyen Thanh (Dept. of Electronic and Research Institute of Computer, Information & Communication, Chungbuk National University) ;
  • Ryu Heung-Gyoon (Dept. of Electronic and Research Institute of Computer, Information & Communication, Chungbuk National University) ;
  • Jeong Young-Hoo (Broadcasting System Research Group, Digital Broadcasting Research Division, ETRI) ;
  • Hahm Young-Kown (Broadcasting System Research Group, Digital Broadcasting Research Division, ETRI)
  • 이영선 (충북대학교 전자공학과 및 컴퓨터정보통신연구소) ;
  • ;
  • 유흥균 (충북대학교 전자공학과 및 컴퓨터정보통신연구소) ;
  • 정영호 (한국전자통신연구원 디지털방송연구단 방송시스템연구그룹) ;
  • 함영권 (한국전자통신연구원 디지털방송연구단 방송시스템연구그룹)
  • Published : 2005.03.01
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Abstract

In the multi-carrier OFDM communication system for the high data rate transmission, the ICI caused by phase noise of transceiver local oscillator may degrade the system performance seriously. In this paper, a new ICI self-cancellation scheme using data-conjugate method is proposed to reduce the ICI caused by phase noise effectively. Then, the CPE, ICI and CIR are derived by the phase noise linear approximation method. Besides, to analyze the efficiency of system performance improvement, the proposed method is compared with the original OFDM and the conventional ICI self-cancellation scheme using data-conversion method. As results, the performance degradation caused by ICI can be mitigated effectively in the OFDM system with ICI self-cancellation scheme, and more performance improvement can be achieved by the proposed ICI self-cancellation scheme using data-conjugate method than the conventional ICI self-cancellation scheme using data-conversion method when phase noise exists.

고속 데이터 전송을 목표로 하는 다중 반송파 시스템인 OFDM통신 시스템에서는 송수신단의 발진기에서 발생하는 위상잡음이 인접 채널간 간섭(ICI: Inter-sub-carrier-interference)을 야기시켜 통신성능에 악영향을 끼친다. 본 논문에서는 ICI 영향을 효과적으로 줄일 수 있는 새로운 data-conjugate 형식의 ICI 제거방법을 제안하고, 위상잡음 선형 근사화 기법을 이용하여 위상잡음에 의해 발생하는 CPE(common phase error), ICI 그리고 CIR(carrier to interference ratio)를 분석한다. 그리고 원래의 OFDM, 기존의 data-conversion 형식의 ICI 제거방법 과 비교하였을 때의 위상잡음에 의한 성능 개선 효과를 분석한다. 결과적으로 ICI 제거방법을 사용하였을 때 성능개선 효과를 얻을 수 있으며, 종전에 연구된 data-conversion 형식의 ICI 제거방법보다 본 연구에서 제안한 data-conjugate 형식의 ICI 제거방법을 사용하였을 때 더 좋은 통신 성능을 얻을 수 있다.

Keywords

References

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