Constructions of MDS symbol-pair codes with minimum distance seven or eight

Symbol-pair codes are proposed to guard against pair-errors in symbol-pair read channels. The minimum symbol-pair distance plays a vital role in determining the error-correcting capability and the constructions of symbol-pair codes with largest possible minimum symbol-pair distance is of great importance. Maximum distance separable (\,MDS\,) symbol-pair codes are optimal in the sense that such codes can acheive the Singleton bound. In this paper, for length $5p$, two new classes of MDS symbol-pair codes with minimum symbol-pair distance seven or eight are constructed by utilizing repeated-root cyclic codes over $\mathbb{F}_{p}$, where $p$ is a prime. In addition, we derive a class of MDS symbol-pair codes with minimum symbol-pair distance seven and length $4p$.

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