Type IV self-dual codes over rings
Steven T. Dougherty, Philippe Gaborit, Masaaki Harada, Akihiro Munemasa, Patrick Solé · IEEE Transactions on Information Theory · 1999
We study Type IV self-dual codes over the commutative rings of order 4. Gleason-type theorems of Type IV codes and their shadow codes are investigated. A mass formula of Type IV codes over these rings are given. We give a classification of Type TV codes over Z/sub 4/ and F2+uF/sub 2/ for reasonable lengths. We also construct a number of optimal Type TV codes.