Multiple access is one of the core technologies of wireless communications, which enables wireless base stations to deal with a large number of different users and provide the service for each of them at the same time. Meeting the 5G challenges, non-orthogonal multiple access is one of the main concerned points in 5G technologies. In this paper, two types of non-orthogonal multiple access schemes, namely, 5-ary Multi User Shared Access (5-ary MUSA), which is a our proposed scheme of MUSA that uses a new type of spreading codes called 5-ary codes, and Sparse Code Multiple Access (SCMA), are studied. The Bit Error Rate performance (BER) analysis is shown for different user overloading for uplink systems. Simulation results provide a clear view on the effect of increasing the number of users for the same system parameters. |
