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

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
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Performance Evaluation of AV-MMA Adaptive Equalization Algorithm in high order QAM System

고차 QAM 시스템에서 AV-MMA 적응 등화 알고리즘의 성능 평가

  • Lim, Seung-Gag (Dept. of Information and Communication, Kongju National University)
  • 임승각 (공주대학교 정보통신공학부 정보통신공학 전공)
  • Received : 2015.09.04
  • Accepted : 2015.12.11
  • Published : 2015.12.31
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Abstract

This paper relates with the eualization performance of Adaptive Varying-MMA (AV-MMA) in order to the minimization of intersymbol interference that is occurs in the nonlinear communication channel. In order to obtain the error signal in the tap coefficient updating process of adaptive equalization algorithm, the present MMA uses the constant modulus. But in AV-MMA, the adaptively varying modulus are used according to the equalizer output, it is possible to reduce the error signal and possbile to improving the overall equalization performance. In order to improved equalization performance of the AV-MMA in the 64-QAM signal, the present MMA performance were compared. For this, the output signal constellation of equalizer, residual isi, maximum distortion, MSE and SER curves are applied. As a result of computer simulation, the AV-MMA has more better performance in the every performance index than MMA, and the SER performance shows that it has more robustness in high SNR environmnet compared to MMA.

본 논문은 비선형 통신 채널에서 발생되는 부호간 간섭의 영향을 최소화하기 위한 적응 등화 알고리즘인 AV_MMA(Adaptive Varying-MMA)의 성능에 관한 것이다. 고차 QAM 신호에 대한 적응 등화 알고리즘에서 탭 계수 갱신을 위한 오차 신호 발생시 기존 MMA에서 constant modulus를 이용하지만, AV-MMA에서는 등화기 출력에 따라 adaptively varying modulus를 적용하므로 이를 줄일 수 있어서 전체적인 등화 성능을 개선할 수 있다. 64-QAM 신호에 대한 AV-MMA의 개선된 등화 성능의 비교를 위하여 MMA의 성능과 비교하였으며, 이를 위하여 등화기 출력 성상도, 잔류 isi, 최대 찌그러짐과 MSE와 SER을 적용하였다. 컴퓨터 시뮬레이션의 결과 모든 성능에서는 AV-MMA가 MMA보다 우월하였고, SER 성능에서 SNR이 높은 경우 강인함을 알 수 있었다.

Keywords

References

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