科研之友
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摘要
A Method for Construction self-dual codes over Z4is proposed by using self-dual codes over the ring Z4 vZ4, where v2=1. A Gray map from (Z4 vZ4)nto Z42nis introduced, and some properties about self-dual codes over Z4 vZ4are given. It showns that the Gray image of a self-dual code over Z4 vZ4of length n is a self-dual code over Z4of length 2n. Further, some extremal Type I and Type Ⅱcodes over Z4are constructed.
