Subsidiary Maximum Likelihood Iterative Decoding Based on Extrinsic Information

  • Yang, Fengfan (Department of Electronic Engineering, Nanjing University of Aeronautics & Astronautics) ;
  • Le-Ngoc, Tho (Department of Electrical & Computer Engineering, McGill University)
  • Published : 2007.03.31

Abstract

This paper proposes a multimodal generalized Gaussian distribution (MGGD) to effectively model the varying statistical properties of the extrinsic information. A subsidiary maximum likelihood decoding (MLD) algorithm is subsequently developed to dynamically select the most suitable MGGD parameters to be used in the component maximum a posteriori (MAP) decoders at each decoding iteration to derive the more reliable metrics performance enhancement. Simulation results show that, for a wide range of block lengths, the proposed approach can enhance the overall turbo decoding performance for both parallel and serially concatenated codes in additive white Gaussian noise (AWGN), Rician, and Rayleigh fading channels.

Keywords

References

  1. C. Berrou and A. Glavieux, 'Near optimum error correcting coding and decoding: Turbo codes,' IEEE Trans. Commun., vol. 44, pp. 1261-1271, Oct. 1996 https://doi.org/10.1109/26.539767
  2. W. Feng, J. Yuan, and S. Vucetic, 'A code-matched interleaver design for turbo codes,' IEEE Trans. Commun., vol. 50, pp 926-937, June 2002 https://doi.org/10.1109/TCOMM.2002.1010612
  3. G. Colavolpe, G. Ferrari, and R. Raheli, 'Extrinsic information in iterative decoding: A unified view,' IEEE Trans. Commun., vol. 49, pp. 2088-2094, Dec. 2001 https://doi.org/10.1109/26.974255
  4. P. Robertson, 'Illuminating the structure of parallel concatenated recursive systematic (TURBO) codes,' in Proc. IEEE Globecom'94, San Francisco, CA, 1994,pp. 1298-1303
  5. N. Farvardin and V. Vaishampayan, 'Optimum quantizer design for noisy channels: An approach to combined source-channel coding,' IEEE Trans. Inf. Theory, vol. 33, pp. 827-838, Nov. 1987 https://doi.org/10.1109/TIT.1987.1057373
  6. J. W. Lee and R. E. Blahut, 'Bit error rate of finite length turbo codes,' in Proc. ICC 2003, Anchorage, AK, 2003, pp. 2728-2732
  7. S. Benedetto, D. Divsalar, G. Montorsi, and F. Pollara, 'Serial concatenation of interleaved codes: Performance analysis, design, and iterative decoding,' IEEE Trans. Inf. Theory, vol. 44, pp. 909-926, May 1998 https://doi.org/10.1109/18.669119