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arXiv · 2609.25115

Subspace coverings and generalized covering radii of generalized Zetterberg codes

Shitao Li·Yang Li·Gaojun Luo·Zhonghua Sun
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Abstract

Generalized covering radii measure how many columns of a parity-check matrix are needed to generate several syndromes simultaneously. Their finite-geometric counterparts are $(ρ,t)$-saturating sets, for which every $t$-dimensional subspace is contained in a subspace generated by at most $ρ$ prescribed vectors. We investigate this covering problem for the norm-one configurations associated with generalized Zetterberg codes. We establish the upper bound $2t+1$ over every nonbinary finite field and in an explicit binary range, together with complementary lower bounds obtained by counting subspaces and constructing subfield obstructions. For an explicit range of large $t$, these configurations are $t$-strong blocking sets, and the $t^{\rm th}$ generalized covering radius attains its minimum possible value $t$. For binary Zetterberg codes, we determine the second generalized covering radius in every extension degree and prove that the third radius is seven for an infinite subfamily.

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Shitao Li, Yang Li, Gaojun Luo, Zhonghua Sun. 2026-09-20. Subspace coverings and generalized covering radii of generalized Zetterberg codes. https://arxiv.org/abs/2609.25115

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