The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Design of an $tan^{-1}$ circuit for the carrier frequency offset compensation of IEEE 802.11a PHY

IEEE 802.11a PHY의 반송과 주파수 옵셋 보정을 위한 $tan^{-1}$ 회로 설계

  • 김수영 (충북대학교 정보통신공학과 통신회로및 시스템설계연구실) ;
  • 임춘식 (한국전자통신연구원) ;
  • 조경록 (충북대학교 컴퓨터정보통신연구원)
  • Published : 2003.04.01
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Abstract

In this paper, an $tan^{-1}$ circuit for the frequency synchronization of OFDM based IEEE 802.11a is presented. The proposed circuit consists of a divider, an $tan^{-1}$ ROM and a phase detector, which can detect frequency offset within 0.0491 rad. The circuit implemented with FPGA shows a pull-in range of under ${\pm}625KHz$ at 5dB AWGN. It may be useful for IEEE 802.11a WLAN standard.

본 논문에서는 IEEE 802.11a 무선 OFDM 시스템의 반송파 주파수 옵셋 추정에 필요한 $tan^{-1}$ 회로를 구현하였다. 제안된 회로는 위상의 간격이 0.0491 rad 이내로 반송파 주파수 옵셋을 추정할 수 있으며, 나눗셈기, $tan^{-1}$ ROM, 위상 결정기로 구성되어 있다. FPGA를 이용하여 구현한 회로는 AWGN 5dB에서 ${\pm}625KHz$의 범위를 추정할 수 있으며 IEEE 802.11a 무선 랜 규격에 적합하다.

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References

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