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 -