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

  • 제25권6A호
  • /
  • Pages.782-793
  • /
  • 2000
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  • 1226-4717(pISSN)
  • /
  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

위성 통신 링크에서 강우 감쇠 보상을 위한 신호 레벨 예측기법

A Signal-Level Prediction Scheme for Rain-Attenuation Compensation in Satellite Communication Linkes

  • 임광재 (한국전자통신연구원 무선, 방송기술연구소 위성통신시스템연구부) ;
  • 황정환 ((주)나리지온) ;
  • 김수영 (한국전자통신연구원 무선, 방송기술연구소 위성통신시스템연구부) ;
  • 이수인 (한국전자통신연구원 무선, 방송기술연구소 방송시스템연구부)
  • 발행 : 2000.06.01
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초록

본 논문은 10GHz이상의 주파수 대역을 사용하는 위성 통신 링크에서 강우에 의해 감쇠된 신호 레벨을 동적으로 예측하기 위한 비교적 간단한 예측 기법을 제시한다. 예측 기법은 이산시간 저역 통과 필터링, 기울기에 근거한 예측, 평균 오차 보정, 고정 및 가변 혼합 예측 여유 할당의 4가지 기능 블록을 갖는다. Ku 대역의 측정 데이터로부터 주파수 스케일링에 의해 얻어진 Ka 대역 강우 감쇠 데이터를 이용하여 시뮬레이션을 수행하였다. 평균 오차 보정을 갖는 기울기 예측 기법은 1dB 이하의 표준 편차를 가지며, 평균 오차 보정에 의해 약 1.5~2.5 배의 예측 오차 감소를 보인다. 요구되는 평균 여유 면에서, 혼합 예측 여유 할당은 고정 여유 방법과 가변 여유 방법에 비해 더 적은 평균 여유를 요구한다.

This paper presents a simple dynamical prediction scheme of the signal level which is attenuated and varied due to rain fading in satellite communication links using above 10GHz frequency bands. The proposed prediction scheme has four functional blocks for discrete-time low-pass filtering, slope-based prediction, mean-error correction and hybrid fixed/variable prediction margin allocation. Through simulations using Ka-band attenuation data obtained from the data measured over Ku-band by frequency-scaling, it is shown that the slope-based prediction with the mean-error correction has as small standard deviation of prediction error as below 1 dB, and that the error is about 1.5 to 2.5 times as small as that without the mean-error correction. The hybrid prediction margin allocation requires smaller average margin than those of both fixed and variable methods.

키워드

참고문헌

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