A multiuser k-ary code for the noisy multiple-access adder channel
Multiuser k-ary coding is proposed for a noisy multiple-access adder channel. It is shown that when a T-user delta -decodable k-ary code C is given a priori, a qT-user lambda delta -decodable k-ary code C* is obtained by using a matrix, suchas a Hadamard matrix or a conference matrix of order, where lambda is a positive integer depending on the matrix. More noteworthy is that the code C is an arbitrary delta -decodable k-ary code, and that the coding scheme preserves the total rate, i.e., the total rate of C* is equal to that of C.
adder channel delta-decodable code multiple-access communication multiuser code