Zpk+ 1环上的Quas-i Cyclic 码

近年来,剩余类环Zm上的编码理论有很大的发展,人们通过Gray映射建立了比较系统的Zm环上的编码理论。文章定义了对于n=n1pδ,环Zn1pk 1到环Zppkn1上的Gray映射,给出了该映射的几个性质,并由此得出了Zpk 1环上的指数为pδt长为n=pδn1的quasi_cyclic码与Zp环上的quasi_cyclic码的一一对应关系,这里的t|n1,(n1,p)=1,从而环Zpk 1上的quasi_cyclic码可以看作是环Zp上的quasi_cyclic码,也即看作是有限素域上的quasi_cyclic码。

Quasi_Cyclic Codes over Zpk+ 1

Codes over the finite field has been widely applied in communications. In recent years, codes over residue rings have improved, many systemic results over the residue ring Zm were given via the Gray map. In this paper , the Gray map from Zn 1 pk+ 1 ?? to Zp k n 1 p is def ined, and one of the propositions of this map is given . We show that a quas-i cyclic code of length n = n1p?? with index p??t over Zp k+ 1 is uniquely equivalent to a quasi_cyclic code of length p kn with index p k+ ??- 1t over Zp ,where t | n1, n1, p = 1. Then the quasi_cyclic code over the ring Zp k+ 1 can be taken as the quasi_cyclic code over the ring Zp which is also a finite prime f ield.