On optimal self-orthogonal quasi-cyclic codes

Some infinite classes of optimal self-orthogonal quasi-cycle (SOQC) equal/unequal error protection codes are presented. These codes are specified by corresponding block designs. Several optimal SOQC codes which were not found by Townsend and Weldon (1967) are also given. From the point of view of implementation, the systematic form of the code has some important advantages. Because of the quasi-cyclic structure, self-orthogonality, and systematic form of the codes, their implementation is very simple.<
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