RT info:eu-repo/semantics/article T1 Linear codes in the folded Hamming distance and the quasi MDS property A1 Martínez Peñas, Umberto A1 Rodríguez Ballesteros, Rubén K1 Códigos aditivos K1 Geometría finita K1 Distancia de Hamming plegada K1 Códigos MDS K1 Códigos polinómicos ideales K1 Distribuciones de peso AB In this work, we study linear codes with the folded Hamming distance, or equivalently, codes with the classical Hamming distance that are linear over a subfield. This includes additive codes. We study MDS codes in this setting and define quasi MDS (QMDS) codes and dually QMDS codes, which attain a more relaxed variant of the classical Singleton bound. We provide several general results concerning these codes, including restriction, shortening, weight distributions, existence, density, geometric description and bounds on their lengths relative to their field or alphabet sizes. We provide explicit examples and a binary construction with optimal lengths relative to their field or alphabet sizes, which beats any MDS code (in terms of length compared to the field or alphabet size). PB Springer Nature SN 0925-1022 YR 2025 FD 2025 LK https://uvadoc.uva.es/handle/10324/79159 UL https://uvadoc.uva.es/handle/10324/79159 LA eng NO Designs, Codes and Cryptography, 2025. NO Producción Científica DS UVaDOC RD 21-nov-2025