利用环F2+uF2上长为2e的循环码结构,证明了这样的循环码的一类码在Gray映射下的象是循环码,并给出了环F2+uF2上长为2e的循环码的Gray象仍是循环码的一个充要条件.
By using the structures of cyclic codes of length 2e over the ring F2 +uF2, the Gray image of one kind of such cyclic codes is proved to be cyclic. A sufficient and necessary condition for the Gray image of such cyclic codes to be cyclic is also given.