A new construction of anticode-optimal Grassmannian codes

Year 2021, Volume: 8 Issue: 1, 31 - 39, 15.01.2021

Ben Paul Dela Cruz John Mark Lampos Herbert Palines Virgilio Sison

https://doi.org/10.13069/jacodesmath.858732

Cited By: 1

Abstract

In this paper, we consider the well-known unital embedding from $\FF_{q^k}$ into $M_k(\FF_q)$ seen as a map of vector spaces over $\FF_q$ and apply this map in a linear block code of rate $\rho/\ell$ over $\FF_{q^k}$. This natural extension gives rise to a rank-metric code with $k$ rows, $k\ell$ columns, dimension $\rho$ and minimum distance $k$ that satisfies the Singleton bound. Given a specific skeleton code, this rank-metric code can be seen as a Ferrers diagram rank-metric code by appending zeros on the left side so that it has length $n-k$. The generalized lift of this Ferrers diagram rank-metric code is a Grassmannian code. By taking the union of a family of the generalized lift of Ferrers diagram rank-metric codes, a Grassmannian code with length $n$, cardinality $\frac{q^n-1}{q^k-1}$, minimum injection distance $k$ and dimension $k$ that satisfies the anticode upper bound can be constructed.

Keywords

Ferrers diagram, Rank-metric code, Grassmannian, Constant dimension, Anticode bound

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