摘要
Constacyclic codes are an important class of linear codes in coding theory.Many optimal linear codes are directly derived from constacyclic codes.In this paper,a new Gray map between codes over F_p+uF_p+u^2F_p and codes over Fp is defined,where p is an odd prime.By means of this map,it is shown that the Gray image of a linear(1+u+u^2)-constacyclic code over F_p+uF_p+u^2F_p of length n is a repeated-root cyclic code over F_p of length pn.Furthermore,some examples of optimal linear cyclic codes over F_3 from(1+u+u^2)-constacyclic codes over F_3+uF_3+u^2F_3 are given.
Abstract Constacyclic codes are an important class of linear codes in coding theory. Many optimal linear codes are directly derived from constacyclic codes. In this paper, a new Gray map between codes over Fp ＋ uFp ＋ u^2Fp and codes over Fp is defined, where p is an odd prime. By means of this map, it is shown that the Gray image of a linear （1 ＋ u ＋ u2）-constacyclic code over Fp ＋ uFp ＋ u^2Fp of length n is a repeated-root cyclic code over Fp of length pn. Furthermore, some examples of optimal linear cyclic codes over F3 from （1 ＋ u ＋ u2）-constacyclic codes over F3 ＋ uF3 ＋ u^2F3 are given.
基金
supported by the National Natural Science Foundation of China under Grant No.61370089
the Open Research Fund of National Mobile Communications Research Laboratory,Southeast University under Grant No.2014D04
the Natural Science Fund of Education Department of Anhui province under Grant No.KJ2013Z276
the Fundamental Research Funds of Hefei University under Grant No.10KY01ZD
the Key construction discipline Funds of Hefei University under Grant No.2014XK08
the Natural Science Key Fund of Education Department of Anhui Province under Grant No.KJ2015A226
