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Palette-Alternating Tree Codes

Authors Gil Cohen , Shahar Samocha



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Author Details

Gil Cohen
  • Department of Computer Science, Tel Aviv University, Israel
Shahar Samocha
  • Department of Computer Science, Tel Aviv University, Israel

Acknowledgements

We wish to thank Leonard J. Schulman for many insightful discussions over the years regarding tree codes and interactive coding schemes.

Cite AsGet BibTex

Gil Cohen and Shahar Samocha. Palette-Alternating Tree Codes. In 35th Computational Complexity Conference (CCC 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 169, pp. 11:1-11:29, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2020)
https://doi.org/10.4230/LIPIcs.CCC.2020.11

Abstract

A tree code is an edge-coloring of the complete infinite binary tree such that every two nodes of equal depth have a fraction - bounded away from 0 - of mismatched colors between the corresponding paths to their least common ancestor. Tree codes were introduced in a seminal work by Schulman [Schulman, 1993] and serve as a key ingredient in almost all deterministic interactive coding schemes. The number of colors effects the coding scheme’s rate. It is shown that 4 is precisely the least number of colors for which tree codes exist. Thus, tree-code-based coding schemes cannot achieve rate larger than 1/2. To overcome this barrier, a relaxed notion called palette-alternating tree codes is introduced, in which the number of colors can depend on the layer. We prove the existence of such constructs in which most layers use 2 colors - the bare minimum. The distance-rate tradeoff we obtain matches the Gilbert-Varshamov bound. Based on palette-alternating tree codes, we devise a deterministic interactive coding scheme against adversarial errors that approaches capacity. To analyze our protocol, we prove a structural result on the location of failed communication-rounds induced by the error pattern enforced by the adversary. Our coding scheme is efficient given an explicit palette-alternating tree code and serves as an alternative to the scheme obtained by [R. Gelles et al., 2016].

Subject Classification

ACM Subject Classification
  • Theory of computation → Error-correcting codes
Keywords
  • Tree Codes
  • Coding Theory
  • Interactive Coding Scheme

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