Abstract
Mobile communication systems are always in continuous evolution due to the demands of the end-users using this technology. Therefore, before the possible launch of 5G, some technologies have opened the way to the new mobile communication system. The need for technologies that provide more comfort to users has led to the construction of complex communication systems that were only science fiction decades ago. The information society in which we are now immersed has been the result of constant progress over time. In this paper, a survey of multiple access schemes for next-generation wireless communication systems is presented. Multiple access schemes are reviewed for possible use in next-generation wireless communication systems such as orthogonal multiple access (OMA), non-orthogonal multiple access (NOMA), and delta-orthogonal multiple access (D-OMA), etc. General comparisons of 1G to 6G are presented. Different types of OMA are explained, and then orthogonal frequency division multiple access (OFDMA) is chosen as an example of the OMA scheme to compare with NOMA and D-OMA. There are two types of NOMA: power-domain and code-domain, which are discussed and compared. Simulation results are presented, and a comparison among different access schemes is provided.
Highlights
A multiple access scheme is a leading technology for distinguishing various wireless systems from firstgeneration (1G) to sixth generation (6G)
The system consists of a transmission and reception system for non-orthogonal multiple access (NOMA) and orthogonal frequency division multiple access (OFDMA) through a wireless channel with the additive white Gaussian noise (AWGN)
The OFDMA symbol is formed to be transmitted on the AWGN channel and subsequently receive the signal as an orthogonal frequency division multiplexing (OFDM) symbol using the same coding and modulation parameters of the transmission stage
Summary
A multiple access scheme is a leading technology for distinguishing various wireless systems from firstgeneration (1G) to sixth generation (6G). Frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), and orthogonal frequency division multiple access (OFDMA) have been used in 1G, 2G, 3G, 4G, respectively. These are orthogonal multiple access (OMA) techniques. With the aim of supporting more users non-orthogonal multiple access (NOMA) is proposed. The research trend covers numerous subjects, such as various performance analysis methods, fairness analysis, code and power domain, and user pairing. At this point, a detailed understanding of the current research state of NOMA, VOLUME XX, 2021.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
