Definitions
Non-orthogonal multiple access (NOMA) refers to multiple access schemes that can enable two or more users to be served by the same base station in a single orthogonal resource block (e.g., time slot, subcarrier, spreading code) simultaneously.
Background
Due to the rapidly increasing traffic demand and the scarcity of the radio spectrum, multiple access is necessary for cellular systems to serve a large number of users. Each generation of wireless cellular systems is characterized by a specific multiple access scheme. In particular, frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), and orthogonal frequency division multiple access (OFDMA) are utilized in the first-generation (1G), the second-generation (2G), the third-generation (3G), and the fourth-generation (4G) systems, respectively. As FDMA, TDMA, and OFDMA are...
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References
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Zhou, Y., Wong, V.W. . (2018). Non-orthogonal Multiple Access (NOMA). In: Shen, X., Lin, X., Zhang, K. (eds) Encyclopedia of Wireless Networks. Springer, Cham. https://doi.org/10.1007/978-3-319-32903-1_8-1
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DOI: https://doi.org/10.1007/978-3-319-32903-1_8-1
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