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arXiv · 2205.05122

Multichannel Optimal Tree-Decodable Codes are Not Always Optimal Prefix Codes

Hoover H. F. Yin·Harry W. H. Wong·Mehrdad Tahernia·Russell W. F. Lai
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Abstract

The theory of multichannel prefix codes aims to generalize the classical theory of prefix codes. Although single- and two-channel prefix codes always have decoding trees, the same cannot be said when there are more than two channels. One question is of theoretical interest: Do there exist optimal tree-decodable codes that are not optimal prefix codes? Existing literature, which focused on generalizing single-channel results, covered little about non-tree-decodable prefix codes since they have no single-channel counterparts. In this work, we study the fundamental reason behind the non-tree-decodability of prefix codes. By investigating the simplest non-tree-decodable structure, we obtain a general sufficient condition on the channel alphabets for the existence of optimal tree-decodable codes that are not optimal prefix codes.

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Hoover H. F. Yin, Harry W. H. Wong, Mehrdad Tahernia, Russell W. F. Lai. 2022-05-10. Multichannel Optimal Tree-Decodable Codes are Not Always Optimal Prefix Codes. https://arxiv.org/abs/2205.05122

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