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arXiv cs/0408017cs.ITmath.IT
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Fix-Free码冗余度上界的改进

Improved Upper Bound for the Redundancy of Fix-Free Codes

Sergey Yekhanin

摘要:

如果没有码字是任何其它码字的前缀或后缀,则可变长度码是无固定长度码。在固定自由码中,任何有限码字序列都可以在两个方向上解码,这可以提高对信道噪声的鲁棒性并加快解码过程。本文证明了最优fix-free码存在的一个新的充分条件,并改进了最优fix-free码的冗余度上界。

英文摘要:

A variable-length code is a fix-free code if no codeword is a prefix or a suffix of any other codeword. In a fix-free code any finite sequence of codewords can be decoded in both directions, which can improve the robustness to channel noise and speed up the decoding process. In this paper we prove a new sufficient condition of the existence of fix-free codes and improve the upper bound on the redundancy of optimal fix-free codes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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