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Enhanced Implementation of Max ∗  Operator for Turbo Decoding

  • Dongpei LiuEmail author
  • Hengzhu Liu
  • Li Zhou
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 274)

Abstract

Max ∗  operator is the kernel operation in MAP decoding. An intuitive approximation to the correction term of max ∗  operator is presented. The binary-tree based architecture for multi-variable max ∗  calculation is also suggested. The proposed max ∗  operator provides a good trade off between hardware overhead and logic delay, and can be easily realized in parallel. Simulations on (37,21) turbo code demonstrate that the BER performance of proposed scheme is almost near the optimal Log-MAP algorithm and significantly superior to the Max-Log-MAP algorithm. The proposed enhanced implementation of max ∗  operator has potential applications in turbo decoder.

Keywords

Max ∗  operator Correction function Turbo decoding Log-MAP algorithm Max-Log-MAP algorithm 

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References

  1. 1.
    Berrou, C., Glavieux, A., Thitimasjshima, P.: Near Shannon Limit Error-correcting Coding and Decoding: Turbo-codes. In: Proceedings of IEEE International Conference on Communications (ICC), Switzerland, pp. 1064–1070 (1993)Google Scholar
  2. 2.
    Viterbi, A.J.: An Intuitive Justification and a Simplified Implementation of the MAP Decoder for Convolutional Codes. IEEE Journal on Select Areas in Communications 16(2), 260–264 (1998)CrossRefGoogle Scholar
  3. 3.
    Tan, J., Stuber, G.L.: New SISO Decoding Algorithms. IEEE Transactions on Communications 51(6), 845–848 (2003)CrossRefGoogle Scholar
  4. 4.
    Park, S.J.: Combined Max-Log-MAP and Log-MAP of Turbo Codes. Electronics Letters 40(4), 251–252 (2004)CrossRefGoogle Scholar
  5. 5.
    Papaharalabos, S., Sweeney, P., Evans, B.G.: SISO Algorithms Based on Combined Max/Max ∗  Operations for Turbo Decoding. Electronics Letters 41(3), 142–143 (2005)CrossRefGoogle Scholar
  6. 6.
    Cheng, J.F., Ottosson, T.: Linearly Approximated Log-MAP Algorithms for Turbo Decoding. In: Proceeding of IEEE Vehicle Technology Conference (VTC), Spring, Japan, pp. 2252–2256 (2000)Google Scholar
  7. 7.
    Wang, H., Yang, H., Yang, D.: Improved Log-MAP Decoding Algorithm for Turbo-like Codes. IEEE Communmunications Letters 10(3), 186–188 (2006)CrossRefGoogle Scholar
  8. 8.
    Talakoub, L., Sabeti, L., Shahrrava, B., Ahmadi, M.: An Improved Max-Log-MAP Algorithm for Turbo Decoding and Turbo Equalization. IEEE Transactions on Instrumentation and Measurement 56(3), 1058–1063 (2007)CrossRefGoogle Scholar
  9. 9.
    Papaharalabos, S., Mathiopoulos, P.T., Masera, G., Martina, M.: On Optimal and Near-optimal Turbo Decoding Using Generalized Max ∗  Operator. IEEE Communications Letters 13(7), 522–524 (2009)CrossRefGoogle Scholar
  10. 10.
    Samadian, H., Nia, A.M.: Linear-constant Log-MAP, a Fast Accurate Algorithm for MAP Decoding. Journal of the Franklin Institute, 1721–1733 (2012)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.The Institute of Micro-electronics and Micro-processors, School of ComputerNational University of Defense TechnologyChangshaChina

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