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Improving the max-log-MAP turbo decoder

Improving the max-log-MAP turbo decoder

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Decoding turbo codes with the max-log-MAP algorithm is a good compromise between performance and complexity. The decoding quality of the max-log-MAP decoder is improved by using a scaling factor within the extrinsic calculation. Simulations using the IMT-2000/3GPP parameters demonstrate that this method gives ~0.2 to 0.4 dB performance gain compared to the standard max-log-MAP algorithm.

Inspec keywords: turbo codes; decoding

Other keywords: turbo codes; 3GPP parameters; decoding quality improvement; max-log-MAP turbo decoder; 1MT-2000 parameters; scaling factor

Subjects: Codes

References

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      • Papke, L., Robertson, P.: `Improved decoding with SOVA in a parallel concatenated (Turbo-code) scheme', Proc. IEEE ICC '96, 1996, p. 102–106.
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      • Robertson, P., Villebrun, E., Hoeher, P.: `A comparison of optimal and sub-optimal MAP decoding algorithms operatingin the log domain', Proc. IEEE ICC '95, June 1995, Seattle, p. 1009–1013.
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      • Hagenauer, J., Höher, P.: `A Viterbi algorithm with soft outputs and its applications', Proc. IEEE GLOBECOM '89, Nov. 1989, Dallas, p. 1680–1686.
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      • Berrou, C., Glavieux, A., Thitimajshima, P.: `Near Shannon limit error-correcting coding and decoding: Turbo-codes(1)', Proc. IEEE ICC '93, May 1993, Geneva, Switzerland, p. 1064–1070.
    7. 7)
      • Vögt, J., Koora, K., Finger, A., Fettweis, G.: `Comparison of differentturbo decoder realizations for IMT-2000', Proc. IEEE GLOBECOM '99, Dec. 1999, Rio de Janeiro, p. 2704–2708.
http://iet.metastore.ingenta.com/content/journals/10.1049/el_20001357
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