Vector assignment scheme for M + N users in N -dimensional global additive channel
J. A. Fergus Ross, Desmond P. Taylor · Electronics Letters · 1992
N-dimensional global vector sets are constructed from the additive combinations of N+M individual N-dimensional vector sets. The minimum Euclidean distance between vectors in the individual sets is maintained in the global set. The principal result is that users may be added to a Q-level system whenever N is a power of Q2 without decreasing the minimum distance. This finding may be applicable to synchronised multiuser communications.