On Optimizing Multicarrier-Low-Density Codebook for GMAC With Finite Alphabet Inputs.

Multicarrier-low-density spreading multiple access (MC-LDSMA) is a novel non-orthogonal multiple access scheme, which exploits a multidimensional codebook based on the sparse spreading technique. In this letter, instead of assuming the ideal Gaussian inputs, we contribute to design the sparse spreading codebook with the finite alphabet inputs in an information-theoretic framework. Single user mutu...