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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Phase Noise Compensation in OFDM Communication System by STFBC Method

OFDM 통신 시스템에서 STFBC 기법을 이용한 위상잡음 보상

  • Li Yingshan (Dept. of Electronic Engineering, Chungbuk National University) ;
  • Ryu Heung-Gyoon (Dept. of Electronic Engineering, Chungbuk National University) ;
  • Jeong YoungHo (Mobile Multimedia Broadcasting System Team, Digital Broadcasting Research Division, ETRI)
  • 이영선 (충북대학교 전자공학과) ;
  • 유흥균 (충북대학교 전자공학과) ;
  • 정영호 (한국전자통신연구원 디지털방송연구소 이동멀티미디어 방송연구팀)
  • Published : 2005.10.01
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Abstract

In OFDM system suitable for high capacity high speed broadband transmission, ICI caused by phase noise degrades system performance seriously by destroying the orthogonality among subcarriers. In this paper, a new STFBC method combining ICI self cancellation scheme and antenna, time, frequency diversity is studied to reduce ICI effectively. CPE and ICI are analyzed by the phase noise linear approximation method in the proposed STFBC OFDM system. CIR, PICR and BER are discussed to compare the system performance degraded by phase noise of PLL. As results, STFBC method significantly reduces ICI. Furthermore, the SCI that usually happens in the traditional STBC, SFBC diversity coding method can be easily avoided.

대용량 고속 광대역 전송에 적합한 OFDM(Orthogonal Frequency-Division Multiplexing) 통신 시스템에서 위상 잡음에 의해 발생하는 ICI(Inter-Sub-Carrier-Interference)는 부반송파 사이의 직교성을 깨뜨려 시스템 성능을 현저히 저하시킨다. 본 논문에서는 ICI 제거 기 법과 안테나, 시간, 주파수 다이버시티를 혼합한 새로운 STFBC(Space Time Frequency Block Coding) 방법을 이용하여 ICI를 효과적으로 제거한다. 먼저 위상잡음 선형 근사화 기법을 이용하여 제안한 STFBC OFDM 시스템에서 발생하는 CPE(Common Phase Error) 성분과 ICI 성분을 분석하고 PLL(Phase Locked Loop) 위상잡음에 의해 발생하는 시스템 성능 저하를 비교 분석하기 위하여 CIR(Carrier to Interference Ratio), PICR(Peak Interference to Carrier power Ratio) 그리고 BER(Bit Error Rate)을 토론한다. 분석 결과 제안한 STFBC 방법에서는 ICI를 뚜렷이 제거할 뿐만 아니라 기존의 STBC(Space Time Block Coding), SFBC(Space Frequency Block Coding) 등 다이버시티 코딩 기법에서 나타나는 SCI(Self Channel Interference)를 효과적으로 피면할 수 있다.

Keywords

References

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