ABSTRACT
This chapter provides a comprehensive analytic framework to analyze the performance of emerging non-orthogonal channel access schemes, such as non-orthogonal multiple access (NOMA) and rate-splitting multiple access (RSMA), in sub-6 GHz and Terahertz networks. Numerical results demonstrate a comparison between the efficiency of RSMA, orthogonal multiple access, and NOMA. The chapter also provides an overview of the evolution of wireless network frequency bands and multiple access techniques. In contrast to space-division multiple access, which depends on totally treating any residual interference as noise, and NOMA, which depends on fully decoding interference, RSMA has the capacity to partially decode the interference and partially treating the interference as noise. Multiple access, a critical part of wireless networks, has a significant effect on bandwidth usage, system throughput, and latency. Multiple access in cellular radio refers to a technique in which multiple users share a transmission medium to communicate with the wireless access point.
