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This article represents a comparative study of various types of multiple users' access schemes for cellular radio system. One of the promising technique for the significant bandwidth efficiency enhancement in future wireless cellular system compared to the conventional multiple access technologies, especially orthogonal multiple access is Non-Orthogonal multiple access(NOMA). NOMA have grater spectral efficiency and more massive connectivity over orthogonal in fading environment. Thirddoi:10.35940/ijrte.a1189.078219 fatcat:kw2ockhp35fpnonnsfc462lpde