Torsion Codes of a Class of Constacyclic Codes over Z2m and Their Applications[J]. Acta Electronica Sinica, 2016, 44(8): 1826-1830. DOI: 10.3969/j.issn.0372-2112.2016.08.008.
环Z2m上一类常循环码的挠码及其应用
摘要
该文研究了环
Z
2
m
上任意长的(1+2λ)-常循环码的挠码及其应用.首先,给出环
Z
2
m
上(1+2λ)-常循环码的挠码.然后,利用挠码得到环
Z
2
m
上某些(1+2λ)-常循环码的齐次距离分布.同时,利用挠码证明了环
Z
2
m
上(2
m-1
-1)-常循环自对偶码都是类型I码,并利用这类码构造了极优的类型I码.
Abstract
The torsion codes and their applications of (1+2 λ)-constacyclic codes over the ring
Z
2
m
of arbitrary lengths are studied.The torsion codes of (1+2 λ)-constacyclic codes over
Z
2
m
are given firstly.Then by using the torsion codes
the homogeneous distance of some (1+2 λ)-constacyclic codes is obtained and it is proved that all
(2m-1
-1)-constacyclic self-dual codes over
Z
2
m
are Type I.Some extreme Type I codes are constructed from such constacyclic codes.