한국인터넷방송통신학회논문지 (The Journal of the Institute of Internet, Broadcasting and Communication)

  • 제13권4호
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  • Pages.83-89
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  • 2013
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  • 2289-0238(pISSN)
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  • 2289-0246(eISSN)
한국인터넷방송통신학회 (The Institute of Internet, Broadcasting and Communication)
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다중 스텝 크기 LMS를 이용한 MSAGF-MMA 적응 블라인드 등화의 성능 개선

Performance Improvement of MSAGF-MMA Adaptive Blind Equalization Using Multiple Step-Size LMS

  • 정영화 (남서울대학교 정보통신공학과)
  • 투고 : 2013.06.19
  • 심사 : 2013.08.16
  • 발행 : 2013.08.31
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초록

적응 블라인드 등화는 고속 디지털 데이터 전송시 통신 채널에서 발생되는 부호간 간섭을 최소화하는데 사용되고 있는 기법이다. 본 논문에서는 기존의 MSAGF-MMA 적응 블라인드 등화 알고리즘에 다중 스텝 크기 LMS를 적용함으로써 MSAGF-MMA 알고리즘의 성능을 더욱 개선시킨 등화 알고리즘을 제안한다. 이 알고리즘은 결정지향 크기 오차의 범위를 여러 개로 나누어 각각의 범위에 따라 스텝 크기를 달리 적용하는 다중 스텝 크기를 가지는 LMS 알고리즘을 MSAGF-MMA에 적용하였다. 컴퓨터 모의실험을 통하여 제안한 알고리즘이 MMA나 MSAGF-MMA에 비해 수렴 속도 면에서나 정상상태에서의 잔류 심볼간 간섭 및 잔류 오차, 그리고 앙상블 평균 MSE등에서 크게 향상된 성능을 가짐을 확인하였다.

An adaptive blind equalization is a technique using to minimize the Inter-symbol Interference occurred on a communication channel in the transmission of the high speed digital data. In this paper, we propose a blind equalization more improving performance of the conventional MSAGF-MMA adaptive blind equalization algorithm by applying a multiple step size. This algorithm apply a LMS algorithm with a several step size according to each region divided by absolute values of decision-directed error to MSAGF-MMA. By computer simulation, it is confirmed that the proposed algorithm has a performance highly enhanced in terms of a convergence speed, a residual ISI and a residual error and an ensemble averaged MSE in a steady status compared with MMA and MSAGF-MMA.

키워드

참고문헌

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