Algorithm Analysis in NOMA

Decrease in latency and massive connectivity are some of the focused application scenarios in the upcoming-generation wireless networks. Non-orthogonal multiple access (NOMA) is considered as one of the key technologies for 5th-generation wireless communication due to its high spectral efficiency. The two NOMA techniques are power-domain NOMA and code-domain NOMA. The fundamentals of power-domain NOMA are discussed in this paper. It also briefly discusses the difference in uplink and downlink communication in the system model. From that viewpoint, this paper surveys about the algorithms for detection and decoding in the order of power levels used in superposition coding at the transmitter side and successive interference cancellation (SIC) at the receiver side. The obtained result indicates how users are multiplexed in the power domain by following the algorithm of superposition coding at the transmitter. Furthermore, interference has been removed to give every individual user separate messages by following SIC at the receiver.