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Boosting the Error Performance of Suboptimal Tailbiting Decoders.

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Název: Boosting the Error Performance of Suboptimal Tailbiting Decoders.
Autoři: Handlery, Marc, Johannesson, Rolf, Zyablov, Victor Z.
Zdroj: IEEE Transactions on Communications; Sep2003, Vol. 51 Issue 9, p1485-1491, 7p, 3 Black and White Photographs, 10 Graphs
Témata: DECODERS (Electronics), ERROR-correcting codes, DATA transmission systems
Abstrakt: Tailbiting is an attractive method to terminate convolutional codes without reducing the code rate. Maximumlikelihood and exact a posteriori probability decoding of tailbiting codes implies, however, a large computational complexity. Therefore, suboptimal decoding methods are often used in practical coding schemes. It is shown that suboptimal decoding methods work better when the slope of the active distances of the generating convolutional encoder is large. Moreover, it is shown thai considering quasi-cyclic shifts of the received channel output can increase the performance of suboptimal tailbiting decoders. The findings are most relevant to tailbiting codes where the number of states is not small relative to the block length. [ABSTRACT FROM AUTHOR]
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Databáze: Complementary Index
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Abstrakt:Tailbiting is an attractive method to terminate convolutional codes without reducing the code rate. Maximumlikelihood and exact a posteriori probability decoding of tailbiting codes implies, however, a large computational complexity. Therefore, suboptimal decoding methods are often used in practical coding schemes. It is shown that suboptimal decoding methods work better when the slope of the active distances of the generating convolutional encoder is large. Moreover, it is shown thai considering quasi-cyclic shifts of the received channel output can increase the performance of suboptimal tailbiting decoders. The findings are most relevant to tailbiting codes where the number of states is not small relative to the block length. [ABSTRACT FROM AUTHOR]
ISSN:00906778
DOI:10.1109/TCOMM.2003.816996