Performance and Convergence Analysis of Tree-LDPC codes on the Min-Sum Iterative Decoding Algorithm

Min-Sum 반복 복호 알고리즘을 사용한 Tree-LDPC의 성능과 수렴 분석

  • 노광석 (건국대학교 전자공학과, 차세대 혁신 기술연구원(NITRI)) ;
  • 허준 (건국대학교 전자공학과, 차세대 혁신 기술연구원(NITRI)) ;
  • 정규혁 (단국대학교 정보컴퓨터학부)
  • Published : 2006.01.01

Abstract

In this paper, the performance of Tree-LDPC code is presented based on the min-sum algorithm with scaling and the asymptotic performance in the water fall region is shown by density evolution. We presents that the Tree-LDPC code show a significant performance gain by scaling with the optimal scaling factor which is obtained by density evolution methods. We also show that the performance of min-sum with scaling is as good as the performance of sum-product while the decoding complexity of min-sum algorithm is much lower than that of sum-product algorithm. The Tree-LDPC decoder is implemented on a FPGA chip with a small interleaver size.

본 논문에서는 Tree-LDPC 코드의 성능을 scaling 인자를 이용한 min-sum 알고리즘을 사용하여 나타내고, 그때의 water fall 영역에서의 접근 성능은 density evolution 기법을 사용하여 나타낸다. Density evolution 기법을 통하여 얻어진 최적의 scaling 인자를 사용하게 되면 min-sum 알고리즘을 사용하는 Tree-LDPC 코드는 sum-product 알고리즘을 사용했을 때와 비슷한 성능을 나타낼 정도로 상당한 성능 이득을 갖게 되는 반면 sum-product 알고리즘을 사용했을 때보다 복호 복잡도가 훨씬 줄어들게 된다. 작은 인터리버 크기를 갖는 Tree-LDPC 복호기를 FPGA(Field Programmable Gate Array)로 구현하였다.

Keywords

References

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