SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING

Liu Donghua; Tang Chaojing

Volume 23 Issue 12

Dec. 2001

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Article Navigation > Journal of Electronics & Information Technology > 2001 > 23(12): 1340-1347

Liu Donghua, Tang Chaojing . SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING[J]. Journal of Electronics & Information Technology, 2001, 23(12): 1340-1347.

Citation:

Liu Donghua, Tang Chaojing . SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING[J]. Journal of Electronics & Information Technology, 2001, 23(12): 1340-1347.

Liu Donghua, Tang Chaojing . SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING[J]. Journal of Electronics & Information Technology, 2001, 23(12): 1340-1347.

Citation:

Liu Donghua, Tang Chaojing . SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING[J]. Journal of Electronics & Information Technology, 2001, 23(12): 1340-1347.

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SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING

Received Date: 2000-06-05
Rev Recd Date: 2001-01-22
Publish Date: 2001-12-19

Abstract

Abstract

In this paper, logarithm MAP algorithm used for turbo iterative decoding is analyzed and deduced. Based on the characteristic of turbo coding and decoding and the analysis of branch metric in the trellis, methods of simplifying computation of branch metric and extrinsic information are obtained. And then it is done with the computation of ln(ex+ey) in the log-MAP algorithm to further simplify the complexity of log-MAP. Finally, simulation results and analysis are carried out.

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References(1)

References

C. Berrou.[J].A. Glavieux, P. Thitimajshima, Near Shannon limit error correcting coding and decoding: Turbo-codes(1), In ICC93, Geneva, Switzerland, May.1993,:-[2]S. Benedetto, D. Divsalar, G. Montorsi, F. Pollara, Soft-output decoding algorithms in iterative decoding of turbo codes, TDA Progress Report 42-119, February, 1996, 63-87.[3]L.R. Bahl, J. Cocke, F. Jeinek, J. Raviv, Optimal decoding of linear codes for minimizing symbol error rate, IEEE Trans. on IT, 1974, IT-20(3), 248-287.[4]S. Benedetto, D. Divsalar, G. Montorsi, F. Pollara, A soft-input soft-output maximum a posteriori(MAP) module to decode parallel and serial concatenated codes, TDA Progress Report 42-127,November 1996, 1-20.[5]P. Robertson.[J].E. Villebrum, P. Hoeher, A comparison of optimal and sub-optimal MAP decoding algorithms operating in the log domain, In ICC95, Seattle, Washington, June.1009,1995:-

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