New MDS self-dual codes over finite fields \F_{r^2}

MDS self-dual codes have nice algebraic structures and are uniquely determined by lengths. Recently, the construction of MDS self-dual codes of new lengths has become an important and hot issue in coding theory. In this paper, we develop the existing theory and construct six new classes of MDS self-dual codes. Together with our constructions, the proportion of all known MDS self-dual codes relative to possible MDS self-dual codes generally exceed 57\%. As far as we know, this is the largest known ratio. Moreover, some new families of MDS self-orthogonal codes and MDS almost self-dual codes are also constructed.Comment: 16 pages, 3 tabl

Research on Hermitian self-dual codes, GRS codes and EGRS codes

MDS self-dual codes have nice algebraic structures, theoretical significance and practical implications. In this paper, we present three classes of $q^2$-ary Hermitian self-dual (extended) generalized Reed-Solomon codes with different code locators. Combining the results in Ball et al. (Designs, Codes and Cryptography, 89: 811-821, 2021), we show that if the code locators do not contain zero, $q^2$-ary Hermitian self-dual (extended) GRS codes of length $\geq 2q\ (q>2)$ does not exist. Under certain conditions, we prove Conjecture 3.7 and Conjecture 3.13 proposed by Guo and Li et al. (IEEE Communications Letters, 25(4): 1062-1065, 2021).Comment: 18 page