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

The Institute of Electronics and Information Engineers (대한전자공학회)
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Serially Concatenated Multilevel Coded Modulation

직렬연접 다중레벨 부호변조

  • Bae, Sang-Jae (School of Electronic and Electrical Engineering, Kyungpook National University) ;
  • Lee, Sang-Hoon (School of Electronic and Electrical Engineering, Kyungpook National University) ;
  • Joo Eon-Kyeong (School of Electronic and Electrical Engineering, Kyungpook National University)
  • 배상재 (慶北大學校 電子電氣工學部) ;
  • 이상훈 (慶北大學校 電子電氣工學部) ;
  • 주언경 (慶北大學校 電子電氣工學部)
  • Published : 2002.11.01
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Abstract

Serially concatenated multilevel coded modulation (SCMCM) is proposed in this paper. It is a combined scheme of the outer convolutional code and inner multilevel coded modulation (MCM) which is bandwidth-efficient coded modulation. And the performance of three schemes for decoding of the proposed SCMCM is compared and analyzed. As results of simulations, global iterative decoding with inner and outer code should be performed to improve the error performance as the number of iterations is increased. And the scheme which uses both local iterative multistage decoding in MCM and global iterative decoding with inner and outer code, called Scheme 3 in this paper, shows the best error performance among the three schemes considered in this paper. In addition, performance difference between this scheme and the others is increased as the signal to noise ratio (SNR) is increased. Therefore, Scheme 3 is considered to be the proper decoding scheme of SCMCM.

본 논문에서는 다중레벨 부호변조를 내부구성부호로 사용하고 길쌈부호를 외부구성부호로 사용하는 직렬연접 다중레벨 부호변조가 제안된다. 그리고 제안된 직렬연접 다중레벨 부호변조의 세 가지 복호방안에 대한 성능이 비교 및 분석된다. 모의실험 결과 제안된 직렬연접 다중레벨 부호변조에서 반복복호 횟수의 증가에 따라 그 성능을 향상시키기 위해서는 내부구성부호와 외부구성부호사이의 반복복호가 수행되어야 한다. 그리고 본 논문에서 제시된 세 가지 방안 중에서 내부 다중레벨 부호변조의 반복적 다단계복호와 내부구성부호와 외부구성부호사이의 반복복호를 모두 수행하는 Scheme 3의 오류성능이 가장 우수하였다. 또한 Scheme 3과 다른 방안들과의 성능차이는 신호 대 잡음비가 증가할수록 더욱 증가하였다. 그러므로 직렬연접 다중레벨 부호변조의 복호방안으로는 Scheme 3이 적합하리라 사료된다.

Keywords

References

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