Error-floor mitigating turbo code communication method

Details Error-floor mitigating turbo code communication method Error-floor mitigating turbo code communication method

1998-10-22

2000-02-22

Ghebretinsae, Temesghen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

714786, H04L 512, H03M 1312

Patent

active

060288973

ABSTRACT:
The turbo encoding process does not flush tail bits of the second constituent encoder at the end of a block systematic data so that this second constituent encoder is not placed in a known zero ending state but placed in any possible ending state from which backward recursion starts at all possible beginning states during decoding to estimate the systematic data while avoiding potential mismatches between the forward and backward recursions during decoding, and between the systematic and second parity-check tail bits during decoding. The modified a posterior probability second decoder implements the backward recursion starting from all possible states. Significant bit error rate improvement is had without a significant error floor in the range of interest. Iterative decoding provides iterative results that are subject to majority voting selection for improved estimations of the decoded systematic data sequence.

REFERENCES:
patent: 5446747 (1995-08-01), Berrou
patent: 5721745 (1998-02-01), Hladik et al.
Berrou C., Glavieux, A. & Thitimajshima, P. "New Shannon Limit Error-Correcting Coding and Decoding: Turbo Codes" 1993, IEEE, p. 1064-1070.
Divsalar D., Pollara, F., "Turbo Codes for Deep-Space Communications", TDA Progress Report 42-120, Feb. 15, 1995.

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