The covering radii of a class of binary cyclic codes and some BCH codes

摘要

In 2003, Moreno and Castro proved that the covering radius of a class of primitive cyclic codes over the finite field F2 having minimum distance 5 (resp. 7) is 3 (resp. 5). We here give a generalization of this result as follows: the covering radius of a class of primitive cyclic codes over F2 with minimum distance greater than or equal to r+2 is r, where r is any odd integer. Moreover, we prove that the primitive binary e-error correcting BCH codes of length 2f-1 have covering radii 2e-1 for an improved lower bound of f.