Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

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Turbo Coded OFDM Scheme for a High-Speed Power Line Communication

고속 전력선 통신을 위한 터보 부호화된 OFDM

  • Kim, Jin-Young (Department of Wireless Communication Engineering, Kwangwoon University) ;
  • Koo, Sung-Wan (Department of Wireless Communication Engineering, Kwangwoon University)
  • Published : 2010.01.31
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Abstract

In this paper, performance of a turbo-coded OFDM system is analyzed and simulated in a power line communication channel. Since the power line communication system typically operates in a hostile environment, turbo code has been employed to enhance reliability of transmitted data. The performance is evaluated in terms of bit error probability. As turbo decoding algorithms, MAP (maximum a posteriori), Max-Log-MAP, and SOVA (soft decision viterbi output) algorithms are chosen and their performances are compared. From simulation results, it is demonstrated that Max-Log-MAP algorithm is promising in terms of performance and complexity. It is shown that performance is improved 3dB by increasing the number of iterations, 2 to 8, and interleaver length of a turbo encoder, 100 to 5000. The results in this paper can be applied to OFDM-based high-speed power line communication systems.

본 논문은 전력선 통신 채널에서 터보 부호와 OFDM 시스템의 성능을 분석하고 시뮬레이션 하였다. 전력선통신 시스템은 최악의 환경에서 동작되기 때문에 터보 부호는 전송 데이터의 신뢰성을 보장하기 위해서 사용되었다. 시뮬레이션의 성능은 비트 오류 확률로써 표현하였다. 터보 복호 알고리즘으로써 MAP과 Max-Log MAP 알고리즘, 그리고 SOVA를 선택하였고, 이것들의 성능을 비교하였다. 시뮬레이션 결과로부터, Max-Log MAP 알고리즘이 성능과 복잡도면에서 유망하다는 것이 입증되었다. 그리고 터보 부호기의 인터리버 길이가 100에서 5000으로 변할 때와 반복 횟수가 2번에서 8번으로 증가할 때, 각 각 3dB증가하였음을 알 수 있다. 본 논문에서의 결과는 OFDM를 기반으로 하는 전력선 통신 시스템에 적용될 수 있음을 보여준다.

Keywords

References

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