Additives;
Information theory;
Indexes;
Information processing;
Modulation;
Tools;
Mathematics;
Perfect codes;
Doob graphs;
Eisenstein-Jacobi integers;
DISTANCE-REGULAR COVERINGS;
POLYNOMIALS;
D O I:
10.1109/TIT.2019.2946612
中图分类号:
TP [自动化技术、计算机技术];
学科分类号:
0812 ;
摘要:
We solve the problem of existence of perfect codes in the Doob graph. It is shown that 1-perfect codes in the Doob graph D(m, n) exist if and only if 6m + 3n + 1 is a power of 2; that is, if the size of a 1-ball divides the number of vertices.