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PreprintCC BY-NC-SA 4.0arXiv

An Upper Bound to the Undetected Error Exponent with Erasure Decoding at Positive Rates

Abstract

We study the undetected-error exponent of discrete memoryless channels with erasure decoding. Assuming that the undetected-error and erasure probabilities vanish, we derive an upper bound on the undetected-error exponent at positive rates. The bound uses Somekh-Baruch's genie-aided argument where an auxiliary output provides the decoder with a list of codewords. It recovers Telatar's tight rate-zero converse and is at least as tight as the straight-line bound. A numerical example shows that the improvement over the straight-line bound can be strict.

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BibTeX
@misc{moeini2026upper,
  title = {{An Upper Bound to the Undetected Error Exponent with Erasure Decoding at Positive Rates}},
  author = {Seyed AmirPouya Moeini and Marco Dalai and Albert Guillén i Fàbregas},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.15420},
  eprint = {2610.15420},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.15420},
  note = {CC BY-NC-SA 4.0},
}
RIS
TY  - UNPB
TI  - An Upper Bound to the Undetected Error Exponent with Erasure Decoding at Positive Rates
AU  - Seyed AmirPouya Moeini
AU  - Marco Dalai
AU  - Albert Guillén i Fàbregas
PY  - 2026
DA  - 2026/10/11
PB  - arXiv
DO  - 10.48550/arxiv.2610.15420
UR  - https://arxiv.org/abs/2610.15420
AB  - We study the undetected-error exponent of discrete memoryless channels with erasure decoding. Assuming that the undetected-error and erasure probabilities vanish, we derive an upper bound on the undetected-error exponent at positive rates. The bound uses Somekh-Baruch's genie-aided argument where an auxiliary output provides the decoder with a list of codewords. It recovers Telatar's tight rate-zero converse and is at least as tight as the straight-line bound. A numerical example shows that the improvement over the straight-line bound can be strict.
ER  -