대한전자공학회논문지TC (Journal of the Institute of Electronics Engineers of Korea TC)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

차분방법에 의한 OFDM 심볼 동기검출 방식

A Symbol Synchronization Detection by Difference Method for OFDM Systems

  • 주창복 (경남대학교 전자공학과) ;
  • 박남천 (경남대학교 전자공학과)
  • Joo Chang-Bok (Dept. of Electronic Engineering, Kyungnam Univ.) ;
  • Park Nam-Chun (Dept. of Electronic Engineering, Kyungnam Univ.)
  • 발행 : 2006.02.01
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초록

본 논문에서는 멀티패스 채널의 지연프로필이나 채널에 부가되는 잡음에 영향을 받지 않으면서 정확한 GI검출 성능을 보이는 간단한 구조의 수정차분방식의 동기검출 방식에 있어서 동기 검출점에서의 S/N비율과 동기점 검출성능과의 관계를 보여준다. 컴퓨터 시뮬레이션에서는 또 IEEE802.11a 표준의 OFDM 프레임을 사용하고 쇼트와 롱 트레이닝의 4심볼을 심볼 동기타이밍 검출에 사용한다. 수신 OFDM신호위상이 1심볼내에서 ${\pi}/2$이내로 일어나는 최소위상채널은 물론 ${\pi}$까지 회전하는 비최소위상 채널에서도 수정차분방식은 채널에 부가되는 잡음전력의 크기에 관계없이 OFDM신호의 1샘풀간격 이내의 오차로 타이밍을 검출해내는 성능을 보인다.

In this paper, we introduce modified difference type symbol timing detection method of simple structure and show the relations between S/N ratio and timing detection performance which less influenced by multipath channel delay profile and added noise level and it show very exact GI detection performance characteristics. In the computer simulations, 4 symbol time duration of short and long training of IEEE802.11a standard OFDM frame are used for symbol synchronization timing detection. The computer simulation results show the very exact symbol timing detection performance characteristic within 1 sample error of OFDM signal regardless channel delay profile from minimn phase channels of phase rotation ${\pi}/2$ to non-minimum phase channels of phase rotation ${\pi}/2$ of received OFDM signal and added noise level in channel.

키워드

참고문헌

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