a lot of coding scholars show a great interest in the study of constacyclic codes and constacyclic self-dual codes over the residue rings.In this paper
by utilizing some related linear codes
we first give the general theory of constacyclic self-dual codes of length
N
over a class of special finite chain rings.Using the obtained results
we give the sufficient conditions of the existence of constacyclic self-dual codes of length
N
over the ring.Finally
we determine the structures of some constacyclic self-dual codes of length
N
over the ring and give their generator polynomials.